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LabSat 4 GNSS Resilience Testing Utility

Structured GNSS interference testing. Completely free.

Perform controlled, repeatable GNSS resilience tests using your existing LabSat 4 scenario recordings.

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Learn about LabSat 4

Why GNSS Resilience Testing Matters

GNSS signals reach the earth’s surface at approximately –130 dBm. At this level, even low-power interference can disrupt positioning, navigation and timing performance.

To understand how receivers behave in real-world RF environments, interference must be applied in a controlled and repeatable way.

The LabSat 4 GNSS Resilience Testing Utility enables engineers to inject synthetic jamming and noise directly into existing LabSat 4 scenario files.  

Create defined interference profiles. Measure how receivers behave under adverse RF conditions. All without transmitting anything over the air.

Controlled GNSS Interference Inside Your Lab

GNSS receivers operate at extremely low signal power levels, making them inherently vulnerable to interference, congestion and intentional jamming. Understanding exactly where performance degrades, and how a receiver recovers, is essential for development, validation and certification.

The LabSat 4 GNSS Resilience Testing Utility allows you to:

Inject Controlled Interference into Existing Recordings

Add synthetic jamming and noise directly to LabSat 4 scenario files (.LS4 & .ini), generating modified recordings ready for replay on LabSat 4 hardware.

Build Complex, Defined Interference Profiles

Combine multiple jamming signals within a single channel. Independently define frequency behaviour, bandwidth and relative power to create structured resilience test conditions.

Visually Validate Before Processing

Use the live spectral preview to confirm signal type, centre frequency, sweep behaviour and bandwidth before generating modified files.

Generate Documented, Repeatable Test Scenarios

Each processed recording includes an automatically generated summary file detailing configuration and added signals, supporting traceability and repeatability across test campaigns.

Supported Interference Profiles

Simulate both simple and complex RF interference environments:

  • Narrowband (CW) interference for basic rejection testing
  • Wideband barrage noise to raise the receiver noise floor
  • Modulated (QPSK-style) jamming to simulate communication signals
  • Swept-frequency (chirp) interference with configurable sweep range and rate
  • Multi-frequency testing (e.g. L1 and L5 simultaneously)

These profiles enable structured evaluation of receiver robustness under realistic RF conditions.

Quantify Receiver Behaviour

Resilience testing is not just about injecting interference, it’s about measuring controlled degradation and recovery performance.

Use the utility to evaluate:

  • C/N₀ degradation versus J/S ratio
  • Loss of lock threshold
  • TTFF (Time to First Fix) under interference
  • Re-acquisition time following jamming removal
  • Position stability and accuracy during interference

Because testing is performed using recorded GNSS data, results remain repeatable and comparable across test campaigns.

Designed for Seamless Replay

The utility validates configuration against LabSat 4 operational data rate limits before processing, ensuring that generated scenarios remain fully replay-compatible.

Processed files can be replayed using the LabSat 4 front panel or Web Server interface, where per-channel attenuation and muting controls support controlled recovery and intermittent interference testing

Using LabSat 4?

The GNSS Resilience Testing Utility is available free of charge for LabSat 4 users. It integrates directly with your existing recordings and hardware platform.

Download free software
New to LabSat 4?

If you are developing GNSS receivers or validating positioning, navigation or timing systems, discover how LabSat 4 enables controlled, repeatable GNSS record-and-replay testing for resilience validation.

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Compliance Note

Intended for controlled laboratory testing only. GNSS interference must never be transmitted outside RF-shielded environments. Users are responsible for ensuring compliance with applicable regulations

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