We’ve had a couple more weeks of GPS study group meetings and slowly we’re starting to catch up on how GPS works.
Notably we’ve taken our test data source and updated Jamey’s old GPS FFT cross cross-correlation code and successfully “found” several satellites in the noise!
We spent last Tuesday meeting discussing how to use cross-correlation between the noisy radio recording a crafted ideal GPS signal to “look” for the hidden GPS data in the recording. This is based off of Andrew Holme’s GPS FFT work.
In addition Nathan has started doing some visualizations of basic GPS encoding: