🛰️ GPS Signal Processing

What it is

A signal processing pipeline for GPS/GNSS receiver front-ends. It handles satellite signal acquisition, tracking, and position solving — from raw RF samples to a fix. Built for understanding the full chain rather than relying on black-box SDKs.

What it covers

• Signal acquisition — searching the 2D code-phase / Doppler space for visible satellites
• Tracking loops — PLL/DLL/FCK for maintaining lock on C/A code signals
• Navigation message decoding — extracting ephemeris, almanac, and timing data
• Position solving — trilateration from satellite pseudoranges to a 3D fix

Stack

• Python — primary implementation language
• Numpy/Scipy — FFTs, correlation, signal processing primitives
• Real SDR data — tested against actual recorded GNSS captures

Why it matters

GPS is everywhere but almost nobody understands what's actually happening under the hood. This project is about demystifying the full GNSS receiver chain — from the raw radio signal to a latitude/longitude fix — and building it from scratch to understand every step.