Generate GNSS Waveform

Generate GNSS Waveform

Generate multi-satellite GNSS baseband waveforms with properly encoded navigation data. Channel impairments (Doppler, delay, noise) can come from a realistic satellite scenario OR from user-specified custom values. Supports GPS, Galileo, and NavIC constellations. The waveform carries real ephemeris so a receiver can decode it for position estimation.

When to Use

• Generating GNSS baseband signals (GPS, Galileo, or NavIC) for receiver testing
• Simulating multi-satellite channels with Doppler and delay from orbital dynamics
• Testing with specific Doppler/delay/SNR values (custom channel mode)
• Building end-to-end GNSS receiver simulations that need decodable nav data

When NOT to Use

• Signal acquisition, tracking loops, nav decoding, or position estimation
• BeiDou/GLONASS (not supported) or SDR hardware transmission

Prerequisites: Helper Files

Copy helper files from MathWorks examples into your project folder. See references/helper-files.md for the full list of source examples and files to copy per constellation (GPS, Galileo, NavIC).

Workflow

The pipeline has 6 steps (0-5). Step 0 determines signal type, channel mode, and data source. The channel mode decides whether Steps 2-3 are needed.

Step 0: Determine signal type + channel mode + data source + nav data intent
Step 1: Configure waveform generator
         ├── Scenario mode → Step 2 (satellite scenario) + Step 3 (compute channel from physics)
         └── Custom mode   → Step 3c (user provides Doppler/delay/SNR directly)
Step 4: Encode navigation data (both modes)
Step 5: Generate waveform with channel (both modes)