Software-Defined Radio · GNSS · Assured PNT
We build SDR-based receivers in which signal processing lives in the software domain. Four bands at once, six GNSS constellations plus an additional LEO-PNT layer, spoofing detection at the level of correlation samples and complete independence from GPS L1 — the platform stays controllable under electronic warfare, spoofing and jamming.
Key advantages
Four independent RF chains tracking simultaneously across L1/E1/B1I/B1C, L2/G2, L5/E5a/B2a/NavIC L5 and E6/B3I. Each band is handled by its own software channel, so losing or jamming one of them does not stop the navigation solution.
Spoofing detection runs before a position is ever computed: the receiver analyses correlation-function distortion, power level and distribution, Doppler consistency and signal angle of arrival.
The receiver needs GPS L1 neither for a cold start nor to sustain a solution. Navigation is formed from whatever combination of signals is available — Galileo E5/E6, GLONASS L3OC/L2OC (CDMA), BDS B2a/B2b/B3I, NavIC L5 and S.
Our solutions carry no CoCom thresholds (18 km / 515 m/s). The dynamic model is built for high altitude, supersonic speeds and high acceleration without loss of lock.
Constellations, signals and LEO
Every constellation is a separate, interchangeable measurement resource. The receiver computes a solution on whatever subset remains available and treats disagreement between sources as independent evidence of spoofing. Galileo and the GLONASS CDMA signals give the most here: a modern signal structure with a pilot component is exactly what an SDR receiver turns into sensitivity margin. Above GNSS sits a separate tier — LEO-PNT, low-orbit signals that are an order of magnitude more expensive to jam.
The E1-C, E5a-Q and E5b-Q pilot components carry no data, so they hold coherently for up to a second. In parallel, the I/NAV message on E1-B and E5b-I is predicted and stripped (data wipe-off) — the data channel then works as a quasi-pilot. Processing both components together adds roughly 3 dB of link margin exactly where a pilot-only receiver already loses lock.
OSNMA — cryptographic authentication of the navigation message; E6 HAS — free high-accuracy corrections.
Full support for the CDMA signals of GLONASS-K/K2 spacecraft: L3OC is BPSK(10) with a dedicated pilot component, L1OC and L2OC are BOC(1,1). Unlike legacy FDMA, there are no inter-frequency hardware biases (IFB) here, so carrier-phase ambiguities resolve the same way they do for GPS or Galileo, and the channels drop into the very same processing pipeline.
Legacy L1OF/L2OF are received in parallel — for compatibility with the older spacecraft in the constellation.
The densest coverage over Asia and the Middle East. The PPP-B2b service delivers corrections straight from the satellite — decimetre accuracy with no ground link and no internet.
The only system with an operational S band (2492.028 MHz) — 1.3 GHz above every other GNSS. Typical L-band jammers do not cover it, which is why NavIC often remains the last trusted source.
An equal source rather than the basis of the solution: on detected anomalies it is excluded entirely, with no degradation of navigation.
Highly elliptical orbits give large elevation angles — useful in urban canyons and mountainous terrain across the Asia-Pacific region.
A satellite 700 km away instead of 20,000: the signal arrives 25–30 dB stronger, so the same jammer denies it at an order of magnitude shorter range. Fast motion produces large geometry change within tens of seconds — the solution converges faster, and faking the consistent Doppler dynamics of an entire LEO constellation is practically impossible.
SBAS corrections are received as well: EGNOS, WAAS, MSAS and GAGAN. The set of active constellations and signals is set by configuration and changes with a firmware update — no hardware replacement involved.
Technology
In a conventional receiver, correlation and tracking are baked into an ASIC — changing behaviour in response to a new threat is impossible. We move the entire chain after the ADC into the programmable domain: FPGA for streaming correlation, CPU for decisions. A new spoofing signature or a new constellation signal is a firmware update, not a new hardware batch.
Four channels, low-noise amplifiers, tunable filters and high-resolution ADCs to preserve headroom under strong interference. The dynamic range is designed for both weak MEO signals and far stronger LEO ones.
Hundreds of parallel correlation channels with access to raw I/Q samples and the full correlation-function profile. Pilot and quasi-pilot are tracked as a pair — coherent accumulation continues where data-channel tracking is no longer possible.
Peak-distortion, power, Doppler and geometry metrics build a trust rating for each satellite individually.
Tightly coupled processing with IMU and odometry: untrusted measurements are excluded, the solution keeps running.
Specifications
| Frequency bands | L1/E1/B1I/B1C · L2/G2 · L5/E5a/E5b/B2a/NavIC L5 · E6/B3I |
|---|---|
| Fourth chain (option) | E6/B3I or NavIC S band — 2492.028 MHz |
| Constellations | Galileo, GLONASS, GPS, BeiDou (BDS-3), NavIC (IRNSS), QZSS; SBAS: EGNOS, WAAS, MSAS, GAGAN |
| Galileo signals | E1-B/C, E5a-I/Q, E5b-I/Q, E6-B/C; OSNMA, E6 HAS |
| GLONASS signals | CDMA: L1OC, L2OC, L3OC (pilot + data); legacy FDMA: L1OF, L2OF |
| Component processing | pilot, quasi-pilot with data prediction (data wipe-off); coherent integration up to 1 s |
| BDS signals | B1I, B1C, B2a, B2b, B3I; PPP-B2b corrections straight from the satellite |
| NavIC signals | L5 and S; support for the modern NVS-series satellites |
| LEO-PNT | dedicated low-orbit signals (Iridium STL, Xona PULSAR, ESA LEO-PNT) and a signals-of-opportunity mode |
| Doppler search range | up to ±45 kHz — covers LEO dynamics and high-speed platforms |
| Channel count | up to 480 software tracking channels |
| Accuracy (RTK / PPP) | 1 cm + 1 ppm / decimetre level |
| Standalone accuracy | < 1.2 m CEP (multi-frequency) |
| Update rate | up to 100 Hz |
| Altitude / velocity limits | none (no CoCom thresholds) |
| Spoofing detection | correlation, power, Doppler, cross-constellation (GPS↔Galileo↔BDS↔NavIC) |
| Inertial support | tightly coupled IMU integration, GNSS-denied coasting mode |
| Interfaces | UART, USB, Ethernet, CAN, PPS; NMEA-0183, RTCM 3.3, proprietary binary protocol |
| Power | 5–36 V, 3.8 W typical |
| Operating temperature | −40…+85 °C |
| Updates | in-field FPGA and algorithm firmware, signed images |
Typical parameters of the base configuration are shown. Exact values for your form factor and integration are provided on request in the technical package.
Applications
Holding route and return point inside an active EW zone, when L1 is unavailable entirely.
Balloons, sondes and suborbital carriers — no altitude or velocity thresholds in the firmware.
Convoys and single vehicles: position-spoofing control, operation through intermittent reception.
Robust positioning under coastal jamming and a record of every spoofing event.
Trusted time for networks and power grids with independent verification of the signal source.
Fixed sites recording and classifying jamming and spoofing events with geolocation.
Documents
Public product materials are available as direct PDF downloads. Pick a document — the download starts right away.
Not what you were looking for? Write to docs@dns-nav.example — we will send the extended technical package.
Contact
Tell us about the platform, the operating conditions and the accuracy you expect — we will put together a configuration and an integration plan.