Resilient Comms & Navigation
Last reviewed: June 2026What's Changing
Two questions run underneath almost everything an aircraft or spacecraft does: where am I? and can I still talk to the people and systems I depend on? For decades the answers came mostly from GPS and a handful of radio links — quietly, reliably, in the background. The frontier shift is the realization that those answers are more fragile than we assumed, and the scramble to make them resilient: hard to jam, hard to spoof, and able to keep working when one source drops.
GPS is the surprising weak point. The satellites sit roughly 20,000 km away, so the signal arriving at your receiver is fantastically faint — about as loud, by the time it reaches the ground, as a car headlight seen from the far side of the country. A signal that weak is easy to drown out with a cheap jammer, or to fake with a slightly stronger counterfeit (called spoofing), and it can simply vanish in a canyon, indoors, or underground.
What "resilient PNT" actually means
Engineers bundle these answers under one acronym: PNT — positioning, navigation, and timing. Positioning is knowing where you are, navigation is figuring out how to get where you are going, and timing is the precise clock that ties it all together (and quietly keeps phone networks and power grids in sync, too). Resilient PNT means never trusting a single source. New positioning satellites in lower orbits beam down a far stronger signal, and sensor fusion blends GPS with cameras, inertial sensors, and known landmarks, so that losing any one input degrades the answer instead of erasing it.
The short version: the goal is an aircraft that always knows where it is and can always get its data through — not because one perfect link never fails, but because it leans on many imperfect ones and stops depending on any single point of failure.
Why It Matters for Aerospace
This sounds like plumbing, and in a sense it is — but it is the plumbing that everything else stands on. The same resilient-PNT and networking work shows up across civil aviation and space:
- Everyday flight safety. GPS jamming and spoofing near conflict zones have already forced airliners to fall back on older navigation aids. Resilient PNT keeps the cockpit's position honest even when the satellite signal is being attacked.
- Autonomy. A drone or air taxi that navigates itself is only as trustworthy as its sense of position. Robust positioning in GPS-denied spots — indoors, in cities, between buildings — is what lets autonomy leave the open field.
- Staying connected on the move. Aircraft, ships, trains, and emergency vehicles increasingly need always-on data links. Flat steerable antennas and satellite networks keep a fast connection while the vehicle is moving and the sky overhead keeps changing.
- Space-to-space links. Big satellite constellations now pass data between satellites with optical (laser) links instead of routing everything through the ground — more capacity, and harder to intercept or jam.
And here is the part students miss: this is one of the cleanest electrical-engineering and signals career lanes in aerospace. Someone has to design the antennas, write the algorithms that fuse messy sensor data, and build networks that heal themselves when a link drops. Those people are radio-frequency (RF) engineers, signal-processing engineers, and communications-systems engineers — and the demand for them is climbing, not shrinking.
The Skills Underneath It
Resilient comms and navigation is not one skill — it is a small family of them, most rooted in electrical engineering and signal processing. Here are the capability clusters that actually do the work, what each one does, and where to start:
| Skill cluster | What it does | Where to start |
|---|---|---|
| RF & signal processing | Pulls a usable signal out of noise, interference, and jamming — the heart of any radio or radar system | Signals-and-systems coursework, the Fourier transform, and a cheap software-defined radio (SDR) |
| Sensor fusion & estimation | Blends GPS, inertial sensors, and vision into one confident position even when inputs disagree or vanish | Linear algebra and the Kalman filter — fuse two noisy sensors in Python |
| Antennas & electromagnetics | Designs the hardware that sends and receives — including flat, electronically-steered antennas that aim without moving parts | An electromagnetics course; simulate a simple antenna pattern |
| Networking & protocols | Routes data across links that come and go, so a mesh of nodes keeps a path open when any one link drops | Computer-networking basics; build a small mesh on cheap radios |
| Optical / laser comms | Carries huge amounts of data on a tight beam of light between satellites — high capacity, hard to jam | Photonics and optics fundamentals; understand fiber first, then free-space |
You do not need all five. Most engineers in this field go deep in one cluster and stay literate in the neighbors. Pick the one that fits how your brain works — math and noise (signal processing), hardware and physics (antennas), or systems and routing (networking) — and build one small thing that actually receives or routes a signal.
Companies & Labs to Know
These companies build the resilient comms and navigation you can actually go work on. Most do both civil and defense work, so we have flagged the focus — each name links to its full AeroEd profile.
| Company | What they build | Focus |
|---|---|---|
| Xona Space Systems | A new satellite system for precise positioning in low Earth orbit, designed as a stronger alternative and backup to GPS. | Civil + defense |
| Trustpoint | Commercial resilient positioning and timing — an independent source of PNT that does not rely on the legacy GPS signal. | Civil + defense |
| Aalyria | High-capacity networking and laser communications software that routes data across satellites, aircraft, and ground links. | Civil + defense |
| Kymeta | Flat, electronically-steered antennas that keep moving vehicles connected without a bulky spinning dish. | Civil + defense |
| Viasat | Satellite communications networks delivering broadband and connectivity to aircraft, ships, and remote sites. | Civil + defense |
| Iridium | A global satellite communications network that works pole to pole, including where no other link reaches. | Civil + defense |
You will also find this work at the big primes, the satellite operators, and government labs — anywhere signals have to survive interference. Browse the full company directory to go deeper on any of them.
How to Start Building Toward This
You do not need a satellite or a lab to start. You need a cheap radio, a little math, and one signal you are determined to receive cleanly.
Concrete first steps
- Get a software-defined radio. A low-cost SDR dongle plus free software lets you listen to real signals — aircraft transponders, weather satellites, GPS itself — and see what noise and interference actually look like.
- Learn the math of estimation. Work through a simple Kalman filter in Python that fuses two noisy sensors into one better answer. This single idea sits underneath almost all resilient navigation.
- Build one honest project. Decode a satellite image from a passing weather satellite, fuse a phone's GPS and accelerometer into a smoother track, or model how a constellation covers the globe. One finished project beats five tutorials.
Pathways this connects to
- Avionics Technician — for installing, testing, and maintaining the comms and navigation systems onboard; see Prepare for AI-Enabled Avionics.
- Aerospace Engineer — for designing the systems, antennas, and algorithms; see Learn AI & ML for Engineering.
- Pilot — for the people who depend on these systems and need to know how they fail; see Prepare for AI in the Cockpit.
Want a guided build? Start with the multi-sensor fusion for GPS-denied navigation project to feel how sensor fusion holds a position together, then try designing a GPS constellation in STK to see how the satellites overhead are arranged.
Things to Weigh
This field is genuinely dual-use. The same anti-jam and anti-spoof skills that protect an airliner's navigation also protect military systems against electronic warfare — the deliberate jamming and deception of signals — and that defense work is where a lot of the field's money and history come from. That is a real and legitimate part of the industry, but it is worth knowing before you specialize, not after.
A couple of honest things to keep in mind:
- The civil and defense lanes overlap. Protecting a 911 drone's navigation and protecting a military jet's both draw on the same RF and signal-processing skills. Knowing which kind of work you want to do is part of being a professional, not a limit on your career.
- The practical fine print. Defense PNT and electronic-warfare roles usually require US citizenship and often a security clearance, and the work can be export-controlled (ITAR), which limits what you can publish or even discuss. Civil comms and navigation work generally is not. Neither is better — but they are different, and worth knowing early.
Sources
Claims on this page draw on company and agency sources and reputable reporting. Where a company states something about its own products, treat it as a company claim until independently confirmed.
- Viasat — satellite communications networks and in-flight connectivity.
- Iridium — pole-to-pole global satellite communications.
- Kymeta — flat, electronically-steered antennas for vehicles on the move.
- Xona Space Systems — low-Earth-orbit positioning as a GPS alternative and backup.
- Trustpoint — commercial resilient positioning and timing.
- Aalyria — networking and laser-communications software.
- FAA — guidance on GPS interference and alternative-PNT for civil aviation.