Navigation Without GPS: Why the TrustPoint Military Project Confirms an Approach RTK Already Uses in Agriculture

GPS is far more fragile than most people assume. Its signal can be jammed, it can be spoofed, and that is exactly why navigation developers are increasingly looking not for a GPS replacement but for something to run alongside it. A telling example is TrustPoint, a US system that recently completed testing under deliberate jamming conditions.

What Was Actually Tested

TrustPoint, working with NovAtel (a Hexagon division), demonstrated that navigation on C-band signals can keep working even when standard GNSS is being jammed. The test ran under a contract with the Naval Air Systems Command, part of the US Navy. A modified NovAtel receiver picked up a signal from a TrustPoint satellite and fixed a position while ordinary GPS signals nearby were being jammed.

The difference from GPS, Galileo, BeiDou, or GLONASS is that all of them sit in the L-band, while TrustPoint chose frequencies around 5010-5030 MHz and plans to fly its transmitters on low Earth orbit satellites. That brings two advantages: jamming GPS frequencies alone is no longer enough, and LEO satellites sit closer to Earth, so the signal can potentially be stronger. Right now there are three demonstration satellites in orbit, and TrustPoint's next step is a full architecture of four satellites and four ground stations, backed by a 4 million dollar SpaceWERX contract.

It Is Not About Replacing GPS, It Is About Backup Channels

TrustPoint itself does not claim C-band is unjammable, it is not a silver bullet. The point is different, giving the system another independent source of coordinates so that knocking out navigation would require jamming several physically different channels at once. In the future, equipment will likely rely on regular GPS, C-band, inertial navigation, and cameras all at the same time, and if one channel starts feeding bad data, the others will catch it.

RTK Has Been Running on This Principle for Years

Agricultural equipment runs into a similar vulnerability far more often than it might seem. In frontline regions, a tractor or combine working a field is almost routinely inside the range of electronic warfare systems, and brief drops or distortions in the satellite signal there are not the exception but the everyday reality. That is why RTK is never built around a single data source.

A typical RTK system combines several satellite constellations at once (GPS, GLONASS, Galileo, BeiDou), corrections from a base station, and, in modern receivers, inertial modules that can hold course and accuracy for a short time even during a partial signal loss. That is not the same thing as TrustPoint's C-band, but the logic is identical: the more independent sources feed into a position fix, the harder it is to knock the whole system off course with a single type of interference.

Why This Is Not Abstract for Ukrainian Farmers

For the military, backup navigation channels are a matter of keeping equipment operational under fire. For farmers in frontline regions, this stopped being theoretical a while ago too. How reliably a guidance system or RTK agri-navigator performs during sowing or harvest directly affects field-pass accuracy, fuel use, and ultimately yield, which is why resistance to interference is becoming just as important a spec as raw positioning accuracy.

Projects like TrustPoint show clearly where satellite navigation as a whole is heading: the future belongs not to one perfect signal but to a set of independent coordinate sources backing each other up. RTK agri-navigation has been on that path for years already.