DOT – GPS World https://www.gpsworld.com The Business and Technology of Global Navigation and Positioning Thu, 02 Nov 2023 14:27:30 +0000 en-US hourly 1 https://wordpress.org/?v=6.4.3 Exclusive interview with US DOT https://www.gpsworld.com/van_dyke_responses/ Fri, 03 Nov 2023 13:00:30 +0000 https://www.gpsworld.com/?p=104305 GPS World EIC, Matteo Luccio, asked a few questions about the plan to Karen Van Dyke, Director for PNT and Spectrum Management in the U.S. Department of Transportation’s Office of the Assistant Secretary for Research and Technology (OST-R).

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DOT LogoIn September, the U.S. Department of Transportation (DOT) released the Complementary PNT Action Plan: DOT Actions to Drive CPNT Adoption. On October 16, Matteo Luccio asked a few questions about the plan to Karen Van Dyke, Director for Positioning, Navigation, and Timing (PNT) and Spectrum Management in the U.S. Department of Transportation’s Office of the Assistant Secretary for Research and Technology (OST-R). Below are Luccio’s questions and Van Dyke’s responses.

What is your office’s charter within the federal government to advance the development and deployment of complementary PNT?

The U.S. Department of Transportation (DOT) is the lead for civil PNT requirements in the United States and represents the Federal civil departments and agencies in the development, acquisition, management, and operations of GPS. The DOT Positioning, Navigation, and Timing (PNT) and Spectrum Management program (within the Office of the Assistant Secretary for Research and Technology) coordinates the development of Departmental positions on PNT and spectrum policy to ensure safety, mobility, and efficiency of the transportation network. The Department also provides civil PNT system policy analysis and coordination representing Federal civil agencies responsible for critical infrastructure in the requirements development, acquisition, management, and operations of GPS.

These efforts support Federal policy governing PNT programs and activities for national and homeland security, civil, commercial, and scientific purposes. These include Executive Order 13905, Strengthening National Resilience Through Responsible Use of Positioning, Navigation, and Timing Services (EO 13905), and Space Policy Directive 7, The United States Space-Based Positioning, Navigation, and Timing Policy (SPD-7).

Which GPS vulnerabilities and at what scale is this plan addressing?

The DOT Complementary PNT Action Plan addresses disruption, denial, and manipulation of GPS for critical infrastructure sectors. These vulnerabilities of GPS include unintentional and intentional jamming and spoofing (both measurement and data spoofing) of the GPS signal and physically impeded environments in which the availability of the GPS signal is impacted (e.g., indoors, underground, and urban canyons). This plan is intended to address vulnerabilities/limitations of GPS on both a widespread and local scale.

How and when will this action plan move the federal government’s posture on CPNT from study to action?

In 2020, the DOT Volpe National Transportation Systems Center (Volpe Center) conducted field demonstrations of candidate PNT technologies that could offer complementary service in the event of GPS disruptions. The purpose of the demonstrations was to gather information on PNT technologies at a high technology readiness level (TRL) that can work in the absence of GPS.

While this demonstration was a snapshot in time, there were two central recommendations from the demonstration:

  1. U.S. DOT should develop system requirements for PNT functions that support safety critical services.
  2. U.S. DOT should develop standards, test procedures, and monitoring capabilities to ensure that PNT services, and the equipage that utilize them, meet the necessary levels of safety and resilience identified in Recommendation 1.

The culmination of the demonstration program was the 2021 Report to Congress, Complementary PNT and GPS Backup Technologies Demonstration Report (2021 Demonstration Report). The PNT resiliency recommendations distilled in the 2021 Demonstration Report were vetted through a Federal interagency review process. During the same period, SPD-7 (directed to U.S. Federal Space-Based PNT service providers) and EO 13905 (directed to PNT users) were issued in a coordinated effort to strengthen U.S. PNT policy.

As part of its ongoing responsibilities as civil PNT lead, the Department has developed a Complementary PNT Action Plan to drive CPNT adoption across the Nation’s transportation system and within other critical infrastructure sectors. The plan describes actions that the DOT plans to pursue over the next several years, including engaging PNT stakeholders; monitoring and supporting the development of CPNT specifications and standards; establishing resources and procedures for CPNT testing and evaluation; and creating a Federal PNT Services Clearinghouse. Taken together with efforts of other Federal partners, these initiatives will continue to strengthen the resilience of the Nation’s PNT-dependent systems, resulting in safer, more secure critical infrastructure.

It should be noted that the U.S. Government is not procuring CPNT systems for non-Federal stakeholders, and as always, all activities are subject to the availability of appropriations.

How does DOT intend to engage PNT stakeholders?

DOT held a PNT Industry roundtable on August 4, 2022 that included representatives from Complementary PNT Technology vendors and critical infrastructure sectors. https://www.transportation.gov/pntindustryround

Feedback from this DOT industry roundtable informed the development of the DOT Complementary PNT Action Plan.

On September 11, 2023, DOT issued a Request for Information (RFI) as one of the steps to drive adoption of Complementary PNT services to augment GPS for the Nation’s transportation system, and through the Executive Branch Interagency Process, for other critical infrastructure sectors. U.S. DOT is planning a resiliency test, evaluation, and performance monitoring strategy for PNT-dependent transportation systems. Taken together with efforts of other Federal partners, these initiatives will strengthen resilience of the Nation’s PNT-dependent systems through the U.S. Government’s purchasing power as a demanding customer of Complementary PNT (CPNT) services, along with critical infrastructure owners and operators, resulting in safer, more secure critical infrastructure for the nation.

The DOT Volpe Center issued this RFI seeking information from industry about availability and interest in carrying out a small-scale deployment of very high technical readiness level (Technology Readiness Level (TRL)≥8) CPNT technologies at a field test range to characterize the capabilities and limitations of such technologies to provide PNT information that meet critical infrastructure needs when GPS service is not available and/or degraded due environmental, unintentional, and/or intentional disruptions. This deployment is intended to test these technologies against CI relevant requirements in order to gain confidence in performance and foster user adoption.

It is likely that DOT will hold future industry roundtables with Complementary PNT technology vendors and critical infrastructure sector owners and operators.

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ION GNSS+ 2023: Day two recap https://www.gpsworld.com/ion-gnss-2023/ Thu, 14 Sep 2023 14:10:28 +0000 https://www.gpsworld.com/?p=103785 ION GNSS+ 2023 is underway in Denver, Colorado, at the Colorado Convention Center. On the second day, industry leaders and show attendees gathered for the 63rd meeting of the Civil GPS Service Interface Committee.

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ION GNSS+ 2023 is underway at the Hyatt Regency Denver at Colorado Convention Center. On the second day, industry leaders and show attendees gathered for the 63rd meeting of the Civil GPS Service Interface Committee. During a break, a cake was wheeled out to celebrate 50 years of GPS. GPS World staff wanted to highlight some key parts of the event.

(Image: Matteo Luccio)

(From left to right) Rick Hamilton, GPS Info Analysis Team Lead, U.S. Coast Guard; Harold “Stormy” Martin, Director, National Coordination Office for Space-Based Positioning, Navigation, and Timing; Dr. Bradford Parkinson, Edward Wells Professor, Emeritus, Aeronautics and Astronautics (Recalled), Co-Director, Center for Position, Navigation and Time, Stanford University; Capt. Scott Calhoun, Commanding Officer, U.S. Coast Guard Navigation Center (NAVCEN) and Karen Van Dyke Director, PNT and Spectrum Management, U.S. Department of Transportation, gathered around a cake to celebrate the 50th anniversary of GPS.

Image: Matteo Luccio

Image: Matteo Luccio

Image: Matteo Luccio

Image: Matteo Luccio

A closer look at the 50 years of GPS cake. Learn more about the history of GPS here.

Image: Matteo Luccio

Image: Matteo Luccio

Lt. Colonel Robert Wray, Commander, Second Space Operations Squadron, U.S. Space Force (second from left), who was featured on the May cover of GPS World. Click here to read our May cover story, featuring an exclusive interview with Lt. Colonel Wray about the training and duties of his team, the challenges they face, and more.

Image: Matteo Luccio

Image: Matteo Luccio

Dr. Bradford Parkinson (left) and Dr. Robert Hampshire, Deputy Assistant Secretary of Research and Technology and Chief Science Officer, U.S. Department of Transportation (right). Click here to learn more about Dr. Bradford Parkinson, who is nicknamed “The father of GPS.”

Image: Matteo Luccio

Image: Matteo Luccio

Col. Andy Menshner, GPS Space and Ground (SML), Space Systems Command, U.S. Space Force, speaking about GPS acquisitions and development updates during the Civil GPS Service Interface Committee.

Image: Matteo Luccio

Image: Matteo Luccio

(Second from left) Karen Van Dyke, Director, PNT and Spectrum Manager, U.S. Department of Transportation Deputy Chair, serves as chair of the 63rd Civil GPS Service Interface Committee. Read more from the Department of Transportation here.

Image: Matteo Luccio

Image: Matteo Luccio

Attendees gathered to hear speakers from the U.S. Department of Transportation, the U.S. Space Force, and other departments and agencies.

Click here to stay up to date with our show coverage!

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Rep. Wexton working behind the scenes to secure GPS and backups https://www.gpsworld.com/rep-wexton-working-behind-the-scenes-to-secure-gps-and-backups/ Tue, 21 Jun 2022 16:56:39 +0000 https://www.gpsworld.com/?p=94338 Reading her biography, you might not think that Jennifer Wexton, U.S. Representative for Virginia’s Tenth District, would be […]

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Rep. Jennifer Wexton

Rep. Jennifer Wexton

Reading her biography, you might not think that Jennifer Wexton, U.S. Representative for Virginia’s Tenth District, would be very connected to technology issues. As an attorney and government leader, she has spent a lot of time advocating for families, veterans and federal workers.   

Yet she is also co-founder of the Congressional Task Force on Digital Citizenship and has become an advocate for protecting the nation’s vital positioning, navigation and timing (PNT) services.  

“We all use GPS every day whether we know it or not, and we need to ensure it stays the gold standard for satellite navigation,” she said. “But as the National Security Council said last year, it has become a single point of failure for America. So much of our critical infrastructure depends on GPS, from the navigation apps on our phones to the military to our financial and energy sectors, and it is past time that we address its critical vulnerabilities and develop and implement reliable backup technologies.” 

Wexton says that she has been aware of and concerned about the issue almost since the day she took her seat in Congress.  

“I am a member of the House Appropriations subcommittee that oversees funding for the Department of Transportation, and civil GPS and PNT issues fall squarely in DOT’s jurisdiction,” she said. “In 2018, Congress passed a law requiring DOT to ensure we have a backup for GPS, and we updated that law earlier this year to ensure that all appropriate types of technologies are included in this effort. I don’t know how we can be comfortable with autonomous drones and self-driving cars if we don’t have technologies in place to support and back up GPS. They are certainly available.” 

The fact that her district includes a huge swath of Virginia’s high-tech corridor has added to her knowledge of the problem and range of possible solutions. In addition to many big names in technology and government contracting, several smaller companies focusing on resilient PNT have offices in her district. These include Echo Ridge, Hellen Systems, Satelles and UrsaNav. All four participated in the Department of Transportation’s Complementary PNT and GPS Backup Technologies Demonstration.  

Adding to her concern are increasing threats to GPS satellites and signals. At a recent hearing with DOT Secretary Pete Buttigieg, she mentioned Russia’s anti-satellite tests and ongoing GPS jamming in Ukraine as examples. 

“And that might not even be the worst of it,” she later said. “We need to be cognizant of Chinese capabilities in cyber and in space. They have shown how they can physically grab one satellite with another and toss it out of orbit.” 

At the hearing, she gently prodded Secretary Buttigieg about DOT’s progress toward protecting the nation.  

“…in the FY-22 Omnibus we created a program which is housed at DOT and provided $15M to help develop the needed requirements and standards and conduct additional testing. […] How’s it going?” 

Buttigieg temporized saying the department was working on the Congressional tasking in the appropriation with the funding available. That tasking focused on testing and developing standards as opposed to contracting for signals to begin making one or more alternatives to GPS widely available for adoption.  

Funding for such an effort has been problematic since a 2018 law required DOT to establish a timing backup for GPS. Administrations have justified inaction by saying that Congress had not funded the effort. Yet hill staff report that for several years administration representatives vigorously opposed any funding at all during annual budget development negotiations. The $15M to establish the program within DOT this fiscal year, which Wexton supported, was the first time any allocation had been made. 

Rep. Wexton is also a big supporter of GPS modernization. “GPS is the gold standard for satellite navigation and America’s gift to the world,” she said. “We have to continually modernize it to support both military and civil uses. That’s a no-brainer.” 

She also sees deploying alternative timing and navigation systems a step to making GPS more secure. “Unlike the Russians and Chinese, we don’t have one or more systems widely deployed domestically if GPS is unavailable for some reason. This makes GPS satellites and signals prime targets for our adversaries, terrorists, and criminals. Having one or more alternatives will create redundancy and make GPS a much less attractive target.” 

Providing one or more alternatives that could be widely adopted could be a relatively inexpensive proposition for the government, certainly when compared to the cost for GPS. More than $2 billion was appropriated for GPS operations and modernization this year. Industry sources estimate that contracts for the suite of alternative PNT sources described in the 2021 DOT report would cost a small percentage of that. 


Dana A. Goward is President of the Resilient Navigation and Timing Foundation.

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$17M proposed for DOT resilient PNT initiatives https://www.gpsworld.com/17m-proposed-for-dot-resilient-pnt-initiatives/ Fri, 04 Jun 2021 21:39:13 +0000 https://www.gpsworld.com/?p=87233 The U.S. Office of Management and Budget (OMB) seeks to extend Trump policies and repeal timing law counter […]

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Photo: E4C/E+/Getty Images

Photo: E4C/E+/Getty Images

The U.S. Office of Management and Budget (OMB) seeks to extend Trump policies and repeal timing law counter to its own study and industry input

The Biden administration’s budget proposal delivered to Congress last week includes $17 million for the small Department of Transportation (DOT) office responsible for leading civil positioning, navigation and timing (PNT) efforts for the nation. This is a marked increase over the $2 million allocated in 2020 and estimated $5 million being spent this fiscal year.

At the same time, it seeks to repeal the National Timing Resilience and Security Act of 2018 that mandated DOT establish a terrestrial timing backup for GPS. This, despite the findings of a recently published RAND study completed for the Department of Homeland Security (DHS), and other input from a telecommunications industry group.

Proposed Spending

The administration’s budget proposes $17 million for the DOT Office of Research and Technology to be split among three areas of effort.

Monitoring and detection. The first is a $3.5 million “(GNSS) performance monitoring and interference detection” project. This is a one-time request that is expected to be followed by a request for $1 million in yearly funding to maintain and operate the capability.

While these may not seem like sufficient funds to many, DOT is tasked with working with other departments and agencies, and to leverage existing capabilities. The National Geospatial-Intelligence Agency (NGA) is specifically named as an important partner with DOT in this effort. NGA already has responsibility for issuing worldwide navigation warnings for U.S. interests. It also has access to a wide variety of information that could be used for the project.

Signal authentication. Another $3.5 million is proposed for Executive Order (EO) 13905 Implementation and GPS Signal Authentication. The EO was issued in February 2020. It seeks to leverage market forces and education to create additional sources of PNT and encourage users to access them. This approach has been criticized by many as unworkable without extensive regulation and mandates for users, while still not addressing the majority of American companies and users.

$1.5 million of this $3.5 million will go to further implement the EO through development of a “PNT threat space model” and otherwise support inter-department PNT profile and research and development efforts.

$2 million would be allocated for a one-time investment in GPS signal authentication to “result in the development and validation of requirements for data and signal authentication capability for civil GPS,” reads the proposal. DOT has regularly requested much greater sums to establish civil signal monitoring, leading many to believe the requirements are already well known. One industry observer suggested this could be “a study in lieu of action.”

GPS Backup. $10 million would be spent for “GPS Backup/Complementary PNT Technologies Research,” essentially follow-on studies to the DOT GPS Backup Technologies Demonstration. “These efforts will further develop PNT modeling, simulation, and testing tools, as well as standards and performance monitoring tools needed to evaluate integration of diverse positioning, navigation, and/or timing technologies into end-user applications. This work will also support development of cyber-secure receivers,” reads the proposal.

Proposed Repeal of Timing Law

More surprising to many than the significant increase in proposed funding is inclusion of a proposal to repeal the National Timing Resilience and Security Act of 2018 (NTRSA).

One congressional staff member expressed shock at seeing that provision. “The act was the epitome of thoughtful, bipartisan congressional effort,” the staff member said. “It was co-sponsored in the Senate by Markey and Cruz, for crying out loud. You can’t get more bipartisan than that. To have this dumped on us without any notice or consultation is amazing. It is not something I would expect from this White House. I am not sure how serious a proposal it is.”

Some observers on the hill and elsewhere have opined that, rather than the repeal proposal being a well-vetted administration policy, it is an effort by OMB staff held over from the previous administration to carry forward and preserve President Turmp’s Executive Order 13905 and other PNT policies. Rather than focusing on establishing a GPS backup capability, they instead urged PNT users to find and pay for alternatives on their own.

Harsh Tone, False Assertions

Compounding the surprise is the exceptionally harsh tone in the proposal, and assertions that many claim are outright false.
Among the problems with the language seen by observers is its assertion that NTRSA seeks to establish a single backup for GPS services.

“It’s unclear to me where such an assertion is supported in the record,” said Greg Winfree, former Assistant Secretary at DOT in the Obama administration. “NTRSA requires the department to incorporate findings from the GPS back-up demonstration program. That project found a variety of systems are needed to protect America,” he said. “NTRSA does require establishment of at least one system, which is incredibly important. Without at least one alternative in place, GPS is one of highest priority targets for our enemies. We have to get the bullseye off of GPS. NTRSA does that.”

This point on national security was reinforced by Scott Pace, head of the Space Policy Institute at George Washington University (GWU). Pace was executive director for the Space Council in the Trump administration. At a recent GWU webinar on the topic, he commented that having an alternative to GPS will contribute to national security and improve global stability. It will “lower the pressure on us to escalate and respond” should GPS satellites be damaged, or services disrupted, he said.

China, Russia, and other nations have terrestrial PNT alternatives to GNSS already in operation. This imbalance creates strategic and tactical problems for the United States, according to many analysts.

The proposed budget also describes NTRSA’s goal of providing at least one backup as “inefficient, anti-competitive and potentially harmful to the existing market for back-up/complementary PNT services.”

“Exactly the opposite is true,” according to Diana Furchtgott-Roth, GWU economics professor. Until January of this year, she led civil PNT issues within the Trump administration as a Deputy Assistant Secretary for Research and Technology at DOT. “DOT’s Complementary PNT and GPS Backup Technologies Demonstration Report, published in January, specifically stated that a variety of technologies are needed to complement GPS. What is the most cost-efficient in an urban area is not necessarily the most cost-efficient in a rural or maritime area.”

“PNT is a utility used by every American. Having affordable complementary service available to people in rural and urban areas is the height of efficiency. It is unquestionably in the interests of national and economic security. In fact, access to at least one alternative should be free so to encourage adoption and best protect the nation,” she said.

“GPS is now a free service provided by the government, and the government is responsible for making sure that it is reliable. GPS outages would cause harm across a broad range of economic activities, including emergency services, general aviation, pipelines, and the electricity grid,” according to Furchtgott-Roth.

No-So-New and Contradictory Research

The proposal to repeal NTRSA cites “recent federal analyses” as part of its justification. One of these is likely a report done for the Department of Homeland Security (DHS) by the RAND Corporation. Touted in a press release last month as “new research” and labeled “Published 2021,” the work was actually completed in 2019. DHS representatives have said the delay in publication was needed for review and approval.

Yet the report was the basis for a DHS report to Congress submitted in April 2020. This has caused some to opine that its publication was timed to reinforce OMB’s effort to repeal NTRSA. “You don’t submit reports to Congress based on un-reviewed, un-approved material,” said a retired DHS official. “The timing of its release is clearly deliberate.”

The study, “Analyzing a More Resilient National Positioning, Navigation, and Timing Capability,” takes a cost-benefit approach to the issue. One of its high-level findings is that government investment in a duplicate, GPS-like backup capability is not warranted.

At the same time, it found that government investment in a national timing network, such as the one mandated by the NTRSA, is likely warranted. Saying that a complete backup for all GPS services in all parts of the country is not cost-beneficial, the study says there are some “…federal initiatives that do appear to be cost effective or close to cost effective.” These include “Timing-only backup through fiber/FirstNet, eLoran, or STL [Satelles].”

According to the retired DHS official, this directly contradicts OMB’s assertion that NTRSA should be repealed. “Either they didn’t read the whole thing, or they counted on most people not reading farther than the top-level recommendations,” he said. “And those top recommendations were clearly selected to match OMB’s desired outcome.”

Telecommunications Industry Cites Need for NTRSA Provisions

The May 2021 “Report to the President on Communications Resiliency” also runs counter to claims made in the budget proposal. In it, the president’s National Security Telecommunications Advisory Committee (coordinated by DHS) cites the need for GPS alternatives in telecommunications and urges President Biden to fund them. It specifically mentions the need for a national timing architecture, and cites the provisions of NTRSA several times as a step in the right direction.

The industry group Alliance for Telecommunications Solutions also sent letters in May to congressional leaders urging funding for GPS alternatives.

Continuing the Discussion

Congress has become increasingly dissatisfied with executive branch actions on resilient PNT over the last decade.

The most recent evidence of this is an extensive and highly critical report of the Department of Defense’s approach to PNT resilience released May 10 by the Government Accountability Office (GAO). Among its recommendations was to not rely on GPS as a primary PNT source but look to more resilient technologies.

While President Trump’s 2020 Executive Order did not make precisely the same recommendation to civil users, it did focus on “responsible use” of PNT and transitioning to using additional, non-GPS dependent sources.

The question still under discussion is how far the government should go to support such a transition.

Seasoned observers regularly comment that Congress has the “power of the purse” and every president’s budget is “dead on arrival” regardless of which party controls the White House.

It seems clear that resilient PNT will be a topic of lively debate between the Congress and the White House, as well as internally on the hill, for the foreseeable future.


Controversial GAO report on DOD nav webinar June 15

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‘Take the bullseye off GPS before it’s too late!’ — PNT leaders at GWU webinar https://www.gpsworld.com/take-the-bullseye-off-gps-before-its-too-late-pnt-leaders-at-gwu-webinar/ Fri, 07 May 2021 16:30:36 +0000 https://www.gpsworld.com/?p=86573 A May 5 webinar about the GPS Backup Technology Demonstration by the U.S. Department of Transportation (DOT) provided […]

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A May 5 webinar about the GPS Backup Technology Demonstration by the U.S. Department of Transportation (DOT) provided valuable insights about the project and intended way forward for PNT efforts in the department.

It also evolved into a policy discussion with former government leaders saying establishing alternative positioning, navigation, and timing (PNT) systems would make GPS safer by “taking the bullseye off,” and that “the time is now, before it is too late.”

The webinar, titled “What Technologies Can Secure GPS?”, was hosted by the Space Policy Institute at George Washington University (GWU). A bipartisan constellation of civil PNT stars gathered to participate in the event.

Featured in the webinar were:

  • introductory remarks by Robert Hampshire, chief scientist for the U.S. Department of Transportation (DOT). He has also been nominated to be DOT’s assistant secretary for research and technology.
  • a presentation by Karen Van Dyke, director, Positioning, Navigation and Timing for DOT, and Andrew Hansen of DOT’s Volpe Transportation Systems Center.
  • discussion of the issues by Diana Furchtgott-Roth, adjunct professor at GWU and a DOT deputy assistant secretary during the Trump administration, and Greg Winfree, director of the Texas Transportation Institute at Texas A&M University and DOT assistant secretary during the Obama administration, both of whom led civil PNT issues for the federal government during their time in office.
  • Scott Pace, director of GWU’s Space Policy Institute, serving as moderator; he was executive secretary of the Space Council during the Trump administration.

Hampshire opened the event with an address that touched on Biden administration themes of “building back better,” modernizing infrastructure, reducing transportation deaths, making transportation more efficient, and preserving America’s technological leadership. All of these were linked to the need to improve PNT resiliency and reliability.

Robert Hampshire, U.S. DOT chief scientist, speaking at GWU webinar on May 5. (Image RNT Foundation)

Robert Hampshire, U.S. DOT chief scientist, speaking at GWU webinar on May 5. (Image RNT Foundation)

Backup tech demo did not close any doors

Van Dyke and Hansen then gave a presentation on the results of the department’s technology demonstration project.
Van Dyke pointed out that, while “GPS backup” may be a popular term, we need complementary capabilities that come into play not just when GPS is unavailable but work alongside it and provide additional capability and resilience all the time.

She also mentioned that the department is well aware there are more candidate technologies than those selected for the demonstration. Companies offering other ways of providing PNT will not be excluded from future consideration and efforts just because they were not part of the demonstration project.

Also, while the government collected the data during the demonstrations, she acknowledged that the effort was designed to “showcase the technologies in their best light.” Further study, stress testing, and evaluation will be needed for any system or technology that might be of interest to the government.

Key elements in the demos

Hansen discussed the particulars of how the technology demonstrations were conducted and some of the results. While the department evaluated 14 measures of effectiveness during the project, Hansen said that two were key — accuracy and coverage per unit of infrastructure.

All the technologies demonstrating timing showed accuracy that would be useful across a wide range of applications, he said. Positioning accuracy, though, varied from a “ones of meters to around 300 meters” depending on the technology.

Hansen said that coverage per unit of infrastructure varied exceptionally between the technologies. These included satellite systems that provide global coverage with a fixed infrastructure, and radio frequency systems with widely different coverage areas per transmitter.

He also observed that the technology demonstration project was not the end of the department’s technical inquiries. In fact, some of its results—such as eLoran performance in an underground scenario—were unexpected and are being further examined.

Transportation has some of the most stringent PNT requirements for accuracy, integrity, availability, and reliability, he said. And not all safety-critical transportation requirements may be met by market-based business models. Commercial systems lack the open standards and specifications that have made GPS so useful and widely adopted. Hansen said that the department will be working on these issues going forward, as well as performance monitoring for alternative systems.

A recurring theme throughout the webinar from all participants was that there is no single solution, no silver bullet, to achieve sufficient national PNT resilience. A systems-of-systems approach was needed. In Hansen’s words “a plurality of complementary systems” is required to ensure PNT reliability and safety, as well as efficient transportation.

Take the bullseye off GPS! — An urgent national security issue

While agreeing with the systems-of-systems approach, Greg Winfree pointed out that a first step still needs to be taken. He said that the nation has known about the need for alternate PNT since a 2001 report by DOT’s Volpe Center. Twenty years later, still no long overdue first step has been taken.

Just establishing the first alternative and complementary system, Winfree said, will make GPS and the United States much safer. “We need to take the bullseye off of GPS,” he said. GPS is so critically important to this country that it is a very attractive target for those who would do us harm. Having even one just alternative in place would make it much less of a target.

Diana Furchtgott-Roth pointed out that China, Russia, Iran and others have terrestrial systems that complement space-based PNT. About establishing alternatives, she said “The time is now, before it’s too late.”

Provisions in the United States National Space Policy provide that “[a]ny purposeful interference with or an attack upon the space systems of the United States or its allies that directly affects national rights will be met with a deliberate response at a time, place, manner, and domain of our choosing.”

Scott Pace also commented that an having an alternative to GPS will contribute to national security and improve global stability. It will “lower the pressure on us to escalate and respond” should GPS satellites be damaged, or services disrupted, he said.

Next steps

One of the questions posed at the end of the session was about actions and expected accomplishments in alternate PNT at DOT in the next 18 months. When could the first alternative system be expected?

The DOT technology demonstration report recommended that the department work next to develop standards and requirements for alternative systems. Current government employees were appropriately reluctant to say much more.

Calling upon her recent experience in government, however, Diana Furchtgott-Roth that said she believed that the department needed time to stress test technologies, develop standards and finalize requirements. Since many capable technologies were mature, some already in operation, she thought the first capability could be up and running within a year after that.

The only missing element according to Furchtgott-Roth is funding, and the focus needs to be on motivating Congress to provide it. The stage is set, she said, with all parties agreeing on the importance of resilient PNT.

She observed that it is very difficult to get the two parties in Congress to agree, and to pass legislation. Yet this has happened three times in support of establishing GPS alternatives. And PNT is such a critical capability that the entire executive branch even came together to protect it last year opposing the FCC’s decision in the Ligado Networks application.

She also related that, when she was in office, she requested $15M for the current fiscal year to do needed stress testing and standards development, but the funding did not appear in the budget.

One reason could have been questions she was asked about whether it is the government’s job to pay for an alternative to GPS, she said.

As a conservative economist her answer was and is a resounding “Yes.” The national need is beyond the business model of one company or private entity. That is something also suggested in DOT’s report on the tech demo.

Also, “enormous value and vast efficiencies” come from one entity funding such a utility, she said. “Just as the government funds national defense, it should also provide a complement to GPS.”

George Washington University’s Space Policy Institute reports a recording of the webinar will be posted on YouTube within the next week.


Dana A. Goward is President of the Resilient Navigation and Timing Foundation.

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GWU hosts webinar on DOT GPS backup demos https://www.gpsworld.com/gwu-hosts-webinar-on-dot-gps-backup-demos/ Mon, 26 Apr 2021 18:34:54 +0000 https://www.gpsworld.com/?p=86373 Top-level current, former PNT leaders to discuss findings A “Who’s Who” of positioning, navigation, and timing (PNT) leaders […]

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Top-level current, former PNT leaders to discuss findings

A “Who’s Who” of positioning, navigation, and timing (PNT) leaders will gather virtually at 11 a.m. PDT/2 p.m. EDT on May 5 to discuss findings of the U.S. Department of Transportation’s (DOT) GPS Backup Technology Demonstration, which took place in 2020.

Included in the “What Technologies Can Secure GPS?” webinar will be DOT Research and Technology leaders from the Obama and Trump administrations, Greg Winfree and Diana Furchtgott-Roth, and currently serving career DOT officials Karen Van Dyke and Andrew Hansen.

Robert Hampshire, current DOT Acting Assistant Secretary for Research and Technology, will make his first public appearance discussing PNT issues.

The event is sponsored by George Washington University’s Space Policy Institute and moderated by Scott Pace. Pace served as the executive director for the Space Council in the last administration. In that capacity, he was responsible for a series of directives and policies impacting PNT in the United States.

Describing the plan for the event, the formal announcement states, “Three separate laws have required the U.S. Department of Transportation (DOT) to back up and complement the Global Positioning System, subject to congressional appropriations. To provide a roadmap, in January the department released its Complementary PNT and GPS Backup Technologies Demonstration Report.”

The program will open with remarks from Scott Pace, director of the Space Policy Institute, who will also moderate the discussion. Hampshire will offer introductory remarks. Van Dyke and Hansen will follow up with a presentation of the report. George Washington University Adjunct Professor Diana Furchtgott-Roth and the Texas Transportation Institute’s Greg Winfree will provide comments.”

A question-and-answer session will follow the addresses and discussion.

The event is free and open to the public, though advance registration is required. Registrants will receive a Zoom link. The webinar will also be recorded.

Register for the webinar here.


Feature photo: Monty Johnson of OPNT demonstrates precise time transfer through 100 kilometers of spooled fiber-optic cable. (Photo: RNT Foundation)

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NAVCEN hosts 60th CGSIC meeting virtually before ION GNSS+ 2020 https://www.gpsworld.com/navcen-hosts-60th-cgsic-meeting-virtually-before-ion-gnss-2020/ Thu, 13 Aug 2020 20:12:44 +0000 https://www.gpsworld.com/?p=81379 This year, the U.S. Department of Transportation (DOT) and the Coast Guard Navigation Center (NAVCEN) are holding the […]

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CGSIC logo

In previous years, the Civil GPS Service Interface Committee (CGSIC) took place right before the start of the ION GNSS+ conference.

This year, the U.S. Department of Transportation (DOT) and the Coast Guard Navigation Center (NAVCEN) are holding the 60th meeting virtually, in collaboration with the Institute of Navigation (ION).

The meeting will take place Sept. 21-22 online before the annual ION GNSS+ conference, which will also take place virtually because of the COVID-19 pandemic.

All CGSIC meetings are free and open to the public. Anyone in the world with access to a computer can attend these public meetings of the U.S. Civil GPS Program.

DOT serves as the civil lead for the GPS program and chairs the CGSIC in this capacity. NAVCEN is assigned duties as deputy chair and executive secretariat for the CGSIC.

Subcommittees of the CGSIC for Timing, International Information, and Surveying-Mapping-Geosciences will hold meetings Sept. 21, and a summary of these meetings will be presented to the CGSIC plenary session on Sept. 22.

The keynote speaker for this year’s plenary session will be Major General John E. Shaw, Combined Force Space Component Commander, U.S. Space Command, and Commander, Space Operations Command, U.S. Space Force.

Presentations this year include:

  • PNT updates from various countries around the world
  • Atomic clocks for fundamental physics: time for discovery
  • Missouri Department of Agriculture land survey program
  • National PNT Policy Update from the National Space Council
  • Mobile geospatial technology’s role in tracking beetle infestation in our nation’s forests

The full agenda is available online. CGSIC presentations will be posted online shortly after the meeting ends. Register for the meetings here.

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GPSIA asks FCC to reexamine Ligado decision https://www.gpsworld.com/gpsia-asks-fcc-to-reexamine-ligado-decision/ https://www.gpsworld.com/gpsia-asks-fcc-to-reexamine-ligado-decision/#comments Thu, 30 Jul 2020 19:41:02 +0000 https://www.gpsworld.com/?p=81131 The GPS Innovation Alliance (GPSIA) sent a letter to FCC Commissioner Michael O’Rielly on July 30 regarding Ligado […]

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GPSIA logoThe GPS Innovation Alliance (GPSIA) sent a letter to FCC Commissioner Michael O’Rielly on July 30 regarding Ligado Networks.

The letter highlights what appears to be different characterizations of the engineering information in the FCC’s record, and suggests that these contrasting statements “support a careful re-examination of the bases of the Ligado Order and a stay of the decision while that occurs.”

“GPSIA appreciates your continued interest and efforts in this proceeding, and your willingness to consider whether a stay of the Ligado order may be appropriate,” the letter states. “As the record in this proceeding makes clear, sound technical analyses were conducted on Ligado’s network by DOT — a neutral third-party U.S. government expert on GPS. Further evaluation of those analyses should prompt the Commission to set aside the Ligado order so that its understanding of the DoT ABC Report can be better aligned with the authors of the report.”

Read the full text of the letter.

Hold on Third FCC Chairmanship. In a related report, the chairman of the Senate Armed Services Committee Sen. Jim Inhofe (R-Okla.) on July 28 placed a hold on the nomination of O’Rielly to another five-year term chairing the commission.

Inhofe said he would block O’Rielly until the nominee “publicly commits to vote to overturn the current Ligado order,” according to a report from Space News.

“Over the past few months, I have sent letters, held hearings and called countless officials to highlight what we all know to be true: the FCC’s Ligado order is flawed and will lead to significant harm to our military and the thousands of individuals and businesses that rely on GPS,” Inhofe said.

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