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I want to learn about GPS and other GNSS signal processing algorithms.
I have solid background in signal processing and some experience in OFDM.
Could you please recommend some books or online resource?
A good place to start is Van Diggelen and Enge's old course, now on YouTube.
There's a lot of GNSS related information on Wikipedia but I would look at Navipedia first.
Finally, you could try one of open source software receivers, the most comprehensive being gnss-sdr.
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