The Global Positioning System (GPS) is “still a significant single point of failure in our country,” said Caitlin Durkovich, National Security Council director for Response and Resilience.
Her remarks were made at the Dec. 9 meeting of the president’s National Space-based Positioning, Navigation and Timing (PNT) Advisory Board.
Durkovich’s remarks were made in the context of a larger national resilience message. She cited recent incidents such as Hurricane Ida, the Colonial Pipeline hack, the winter failure of the Texas electrical grid, and disrupted supply chains. She said everyone is responsible to ensure they, their systems and the nation are able to safely weather adverse events and bounce back better than before.
The interconnectedness of so many vital services such as electrical power and other vital systems like PNT make a holistic approach necessary. The administration is developing a set of resilience principles to support that, she said. It is also ensuring as funds go out to states and localities from the infrastructure bill that making American infrastructure more resilient to climate change and “all hazards” is a priority.
Because “positioning, navigation and timing is foundational to our life,” she said, “resilience is more important now than ever.” Disruptions could lead to “cascading effects.”
Durkovich cited the administration’s Space Priorities Framework as evidence of White House concern. Released this month, it says in part:
“Space systems are an essential component of U.S. critical infrastructure — by directly providing important services and by enabling other critical infrastructure sectors and industries. The United States will enhance the security and resilience of space systems that provide or support U.S. critical infrastructure from malicious activities and natural hazards.”
She also indicated that the Biden administration was following through on two Trump administration policies as important steps to resilience.
Executive Order 13905, “Strengthening National Resilience Through Responsible Use of Positioning, Navigation, and Timing Services,” among other things, calls on all users to avoid over-reliance on GPS. It also calls for the federal government to require PNT resilience to be considered when selecting contractors.
Space Policy Directive 7 “The United States Space-Based Positioning, Navigation, and Timing Policy” outlines a number of research and other efforts. It also says the nation will:
“Invest in domestic capabilities and support international activities to detect, mitigate, and increase resilience to harmful disruption or manipulation of GPS, and identify and implement, as appropriate, alternative sources of PNT for critical infrastructure, key resources, and mission-essential functions.”
Several board members asked about the Federal Communications Commission’s (FCC) order authorizing Ligado Networks to broadcast in frequencies adjacent to those used by GPS. She said the administration was concerned and both the National Economic Council and National Security Council were in discussion. Engagement with the FCC, though, may pend confirmation of a full board of commissioners.
One of the board members asking about the Ligado issue followed up with a comment that adjacent-band concerns pale in comparison to recent Russian threats to GPS satellites. Durkovich responded that there wasn’t much she could say on that topic in public except that it had the attention of the president and his senior advisors.
Durkovich was also asked about the administration’s commitment to execute the 2018 National Timing Resilience and Security Act. The law’s requirement to establish a terrestrial, wireless source of coordinated universal time to back up GPS signals by December 2020 was ignored by the Trump administration.
Her reply was to reaffirm her earlier statement that “assuring positioning, navigation and timing, and the economic and strategic benefits it brings to this nation, is a priority for this administration.”
Video of the entire advisory board meeting is available on YouTube. MS Durkovich’s remarks begin at approximately 1:37:00. A link to the video is also posted as part of the agenda on the board’s website.
Col. Steve Whitney stands beside a statue of General Schriever at Los Angeles Air Force Base, home of the GPS Directorate. (Photo: U.S. Air Force/Joseph Juarez, Sr.)
By Col. Steven Whitney Director, Global Positioning Systems Directorate
The most discussed theme in the U.S. Air Force space community over the last year has been “resiliency.” But what does that actually mean, and how can the Air Force increase resiliency in space?
The GPS Directorate took these questions to heart and thought long and hard about resiliency in our Positioning, Navigation, and Timing (PNT) service. I am pleased to report that we have made significant progress in the past year in our quest to bring a new generation of PNT technology to reality.
More importantly, our investments in space, ground, and user equipment developments are bringing real, tangible benefits towards providing a more resilient PNT service worldwide. We stand on the cusp of delivering modernized civil and military GPS signals which provide critical pieces to the puzzle.
Farther into the future, the Air Force is already exploring new, emerging technologies and capabilities to even further advance the robustness of the GPS enterprise, with the vision that GPS will always remain the “Gold Standard” for the worldwide PNT community.
Resiliency Begins with Signals
Modernized GPS signals will be the first piece of the puzzle for an overall resilient PNT solution. The community has long anticipated the beginning of the multi-GNSS era.
The GPS Directorate has embraced this future with a new L1C signal, designed cooperatively from the ground up to be interoperable with international satellite navigation systems. The signal design will greatly improve GPS reception in cities and other challenging environments.
Another important GPS signal was introduced with our GPS IIF satellites. The L5 signal is designed specifically to meet the demanding requirements for safety-of-life transportation and other high-performance applications.
This signal is broadcast in a radio-frequency band reserved exclusively for aviation safety services to ensure it has optimal spectrum protection. Together, these two new additions greater improve PNT resilience for civil users around the globe.
“The need to improve cyber security and protection quite honestly cannot wait until delivery of the Next-Generation Operational Control System (OCX). To that end, the Directorate has focused on high payoff updates for the existing operational system.”
Other measures already improve resiliency by leveraging existing signals. For example, the L2C signal, when combined with L1 C/A in a dual-frequency receiver, will enable ionospheric error correction and improve positioning and timing accuracy.
For the military, the directorate has been focused on bring Military Code (M-code) into operations. The M-code signal features advanced anti-jam, anti-spoof, and encryption features that will ensure resilient and dependable PNT solutions for the United States and its allies.
The rollout of an operational M-code capability involves all segments of the GPS enterprise, and while it has been a long time in coming, the GPS Directorate made big strides this year (see “2017 in Review”). I will touch on the progress we are making in each of our development programs.
Resiliency in Space
The GPS space segment is the next step towards a more resilient PNT architecture. Our constellation remains robust and healthy, albeit aging, with 31 operational satellites providing worldwide coverage at the time of this article. The GPS III satellites will bring additional robustness with increased power and accuracy over previous generations of satellites.
We made big strides towards launching the first GPS III satellite in 2018, and just as importantly, production is in full swing on the rest of the ten satellites. I am incredibly proud of the entire government and contractor team that is meticulously acquiring, assembling, and testing these complex machines.
GPS IIIF. Farther into the future, the directorate is preparing for the GPS III follow-on program. The Air Force will be adding important new resiliency capabilities, with added signal flexibility via a reprogrammable, digital payload and increased anti-jam support to theater with a Regional Military Protection capability. Over the coming years as the follow-on GPS III satellites join the constellation, they will revolutionize GNSS with the full complement of operational L1C, L2C, L5 and M-code signals.
Resiliency in Control Segment
As important as the satellites are, the control segment is just as integral to the overall resiliency of the GPS enterprise. The need to improve cyber security and protection quite honestly cannot wait until delivery of the Next-Generation Operational Control System (OCX).
To that end, the directorate has focused on high payoff updates for the existing operational system.
For example, we acquired and deployed software-based GPS monitor station receivers, known as Monitor Station Technology Improvement and Capability (MSTIC) receivers, to replace the aging fleet of existing monitor-station receivers.
The functionality and expandability of the MSTIC receiver design will facilitate adding further capabilities such as M-code signal monitoring, and even civil L1C, L2C, and L5 signal monitoring.
The GPS Directorate also deployed a new cybersecurity monitoring suite to enhance cyber defenses. This new suite is in operation today at the GPS Master Control Station (MCS).
Beyond just improving our cyber protection, the Air Force has also stepped out on several OCX off-ramps to support the launch and operation of the GPS III satellites and mitigate risk of further OCX delays.
The Contingency Operations (COps) program modifies the existing Operational Control System (OCS) to allow the first GPS III satellites to join the operational constellation. The Air Force also initiated a companion program, M-code Early Use (MCEU) to further update OCS to provide limited M-code operations.
Together, these two programs provide critical interim steps towards fielding a more resilient constellation.
The OCX program provides the ultimate cyber protection and assurance needed for the GPS enterprise. After emerging from program recertification this year, the program has focused heavily on improved software system engineering and embracing software industry best practices, such as adopting DevOps and greater software automation.
The program has even leveraged Amazon Web Services’ Gov’t Cloud capability to provide more responsive development and test environments. While the program has a long ways to go, the government and prime contractor, Raytheon, are committed to delivery to ensure a robust and secure ground infrastructure.
User Equipment: Final Piece
The final piece of the resiliency puzzle for military customers is our user equipment segment. The directorate has made big strides in delivering the first set of modernized receiver cards for the Military GPS User Equipment (MGUE) Increment 1 program.
These advanced cards will enable platforms across the U.S. Department of Defense to leverage the new M-code signal, providing a tremendous boost in both anti-jam and anti-spoof capability.
They will also provide the latest in cryptography to ensure secure, robust protection for the United States and its allies.
Down the road, the Department of Defense is evaluating additional capabilities and platforms for the MGUE Increment 2 program.
Currently envisioned to address precision guided munitions, space receivers, and a modernized handheld unit, the Increment 2 program will be laying out an acquisition plan in this coming year to further adoption of M-code signals throughout the military.
A consideration for the future of user equipment will be exploring processing multi-GNSS signals. While no decisions have been made, multi-GNSS could offer opportunities for even additional resiliency.
Final Thoughts
This is an exciting time for the GPS enterprise.
We stand on the cusp of a new generation of capabilities that will usher in a huge increase in PNT resiliency and robustness. I am astounded at the quality of work that is presented at the many GNSS and PNT conferences around the world, and it is both exciting and humbling to see the community continuing to innovate ways to increase accuracy, integrity, availability, continuity, and performance.
Likewise, I am honored to lead the men and women of the GPS Directorate as we strive to deliver on our commitments and find new, innovative ways to provide robust and resilient PNT to the world.
This dedicated team is poised and ready to lead us into the future, and we look forward to working with the entire community to continue delivering the GPS “Gold Standard” in space-based PNT.
The U.S. Department of Transportation (DOT) is studying responses to its November 2016 request for information concerning back-up systems for GPS. DoT is investigating possibilities and practicalities of using one or more positioning, navigation and timing (PNT) technologies to ensure PNT resiliency for critical infrastructure in the event of a temporary disruption in GPS availability.
The filing period closed Jan. 30.
RFI Response
Several companies responded to the RFI. Statements from Satelles, NextNav, NovAtel, Allied Partners, Harris, UrsaNav, and Orolia dba Spectracom were not made public because they “contain confidential business information data.”
Statements are available at the web page from Oakridge National Laboratory, UrsaNav and iPosi, SAE International, the GPS Innovation Alliance and Locata Corporation, which made its response openly available “to kick off the necessary public discussion.”
Senate Inquiry
At a Feb. 8 Commerce Committee hearing, Sen. Roy Blunt asked DoT Inspector General Calvin Scovel about progress on GPS back-up, which DoT and the Deputy Secretary of Defense announced they would “be working on” in 2015. Scovel responded with information about the Federal Aviation Administration’s next-gen plan, which did not address the question.
Sen. Blunt then asked Scovel to submit a written answer for entry into the final record of the hearing: “My question for the record will be that this commitment made in 2015 concerned about the current dependency that so many people have with GPS, is ‘Are they moving forward with a backup system if the current GPS system goes down?”
