Lesson 23 — GPS Reception

I use an RTL-SDR and a cheap GPS antenna to see some some of the Global Positioning System (GPS) satellite transmissions.

The GPS reference used to find the taps for the C/A code is [http://www.naic.edu/~phil/rfi/gps/AFD-070803-059-1.pdf].

GPS correlation and demodulation in operation:

A more sophisticated result with better fine-tuning of the carrier offset:

All GNURadio flowgraphs are at https://github.com/gallicchio/learnSDR