It is critical that U.S. warfighters are equipped with capabilities that enable them to locate their targets, confidently navigate their environments, and precisely time and execute any mission objectives. This is where positioning, navigation, and timing (PNT) data – such as the information provided by the Global Positioning System (GPS) – plays a vital role for the military.
Without PNT capabilities – and without resilient and redundant solutions that can withstand adversarial attacks – warfighters would essentially enter the field blind, putting the mission and, more importantly, their lives at risk.
Government Satellite Report (GSR): What role does space-based satellite PNT play in modern warfare? Why is PNT so important for today’s modern military?
Bryan Benedict: PNT is vital in providing both the location and time elements of any military engagement. PNT lets warfighters know where they are and where their objective is located. It essentially answers the “where” and “when” questions.
PNT is so essential to operational success that if a mission is being planned and PNT is unavailable, that operation may be delayed. It is also worth mentioning that various munition systems use GPS as a source of PNT data for targeting purposes.
There are a number of global navigational satellite systems (GNSS) in use by other countries. The U.S. version is GPS. The European solution is called Galileo. China, India, and Japan have their own systems as well.
GSR: Why would the military be concerned about assured PNT? What challenges or threats are there to modern PNT solutions?
Bryan Benedict: The primary challenges and threats to modern PNT are jamming and spoofing. Jamming involves using signals at the same frequency to make the GPS signal unusable. Spoofing involves sending signals that are masquerading as GPS but are intentionally designed to provide erroneous information to the user. Another threat is that adversaries could physically damage the GPS fleet through an anti-satellite (ASAT) missile attack.
Currently, assured PNT for the U.S. military is provided by resilient GPS. It provides ways to work around the loss of some GPS assets or signals and allows PNT even in the presence of jamming. GPS itself is a very low-power signal, and is relatively easy to jam. Alternative PNT allows PNT determination when the GPS fleet is severely degraded or absent all together. SES Space & Defense is working now with other companies to determine how we could leverage our MEO and GEO satellite networks to provide alternative PNT to the USG.
“Not all GPS satellites are M-code capable and not all GPS receivers can process M-code signals. Full M-code capability by the military is expected by the end of 2025.” -Bryan Benedict
GSR: What steps is the military taking to increase the resiliency of PNT signals from space? What is M-code? Has the military officially adopted M-code? What roadblocks exist?
Bryan Benedict: In order to increase the resilience of GPS signals, the military is making it harder to successfully jam and spoof GPS signals. M-code uses next-generation cryptography, higher power and more than one frequency to work around an adversary’s attempt to disrupt GPS usage.
While the military has adopted M-code, roadblocks still exist. Not all GPS satellites are M-code capable and not all GPS receivers can process M-code signals. Full M-code capability by the military is expected by the end of 2025.
To increase the resiliency of PNT, the government has been looking to boost resiliency through the addition of satellites in both the GPS layer and possibly, commercial PNT satellites at other altitudes. They’re definitely encouraging the development of alternative PNT signals from other orbits, including the lower MEO and LEO orbits, as well as through use of alternative frequencies.
The Space Enterprise Consortium awarded a contract to a company that was developing PNT concepts for GEO orbit. If you look at the Chinese Beidou system, they incorporate MEO satellites, similar to GPS, but they also leverage GEO and inclined GEO spacecraft. That means that if their MEO signal is degraded, the Chinese still have the capability to provide regional PNT using their GEO spacecraft.
As far as challenges that currently exist for developing alternative PNT systems, I don’t think the U.S. military has been able to implement M-code on PNT spacecraft outside of MEO. Some of the alternative PNT companies that are trying to do PNT from LEO may not be able to utilize the benefits provided by M-code.
“Commercially provided alternative PNT solutions for the military could provide a stopgap if GPS fleet signals become degraded. If GPS is not possible, commercial PNT would step in.” -Bryan Benedict
GSR: Why would a commercial PNT solution be desirable for the military? What new capabilities or functionality would these new services offer?
Bryan Benedict: The U.S. military would like to have a PNT function that does not depend on GPS, as it is not as resilient as they would like it to be. GPS is a prime target for U.S. adversaries through spoofing, jamming and ASAT attacks. Commercially provided alternative PNT solutions for the military could provide a stopgap if GPS fleet signals become degraded. If GPS is not possible, commercial PNT would step in.
The military is looking for more than one commercial alternative PNT solution. Questions arise whether commercial PNT will be available when needed and whether it can be trusted. Technical challenges exist when alternative PNT is provided outside of the GPS frequency bands and outside of GPS orbit. Ideally GPS receivers could be modified to accept signals from other orbits and other frequencies.
GSR: Why would they need commercial PNT solutions if a new generation of M-code PNT satellites (GPS Block III) is being launched?
Bryan Benedict: While M-code PNT satellites are more resilient to jamming and spoofing, they are no more resilient to an ASAT attack. Commercial PNT would provide an alternative if the GPS fleet becomes unusable.
GSR: Is there a market for commercial PNT outside of the U.S. government?
Bryan Benedict: That is an excellent question. Companies and organizations that rely on GPS – such as banking, utilities, shipping, airlines, and commerce – are dependent upon GPS but frequently have workarounds should GPS not be available. One of these solutions may involve the use of cell towers or other fixed RF transmitters.
“PNT would be a global service, and SES has worldwide satellite network supported by critical ground infrastructure. Providing commercial PNT is an excellent way to provide vital services to the U.S. government.” -Bryan Benedict
I don’t believe there would be customers for commercial PNT as long as they had government-provided alternatives, including GPS and Galileo. It’s unlikely that all of the government provided PNT services will become inoperative, so commercial customers don’t have a strong reason to invest in an alternative PNT system when other government PNT solutions remain available.
GSR: What does SES have planned in regard to commercial PNT services/solutions? Why is this a marketplace that SES is looking to enter? How is the company uniquely qualified to offer these services?
Bryan Benedict: SES is working with small businesses that are developing alternative PNT solutions. Why are we looking to enter this marketplace? First, we believe alternative PNT is a function that the government would like to procure, and SES Space & Defense is organized to serve the U.S. government in particular.
SES Space & Defense is well qualified because of our multi-orbit satellite systems. Future MEO and GEO satellites can host future PNT payloads. PNT would be a global service, and SES has worldwide satellite network supported by critical ground infrastructure. Providing commercial PNT is an excellent way to provide vital services to the U.S. government.