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osqzss / gps-sdr-sim

Software-Defined GPS Signal Simulator
MIT License
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fake doppler #341

Closed kamitanihidetoshi closed 1 year ago

kamitanihidetoshi commented 1 year ago

Hi!

sorry if my English is bad. Is it possible to add a fake Doppler to the simulation to make it more realistic?

Imtiaz08 commented 1 year ago

You are actually manipulating doppler for specific locations. What exactly do you mean by fake doppler?

kamitanihidetoshi commented 1 year ago

If you want to send a false signal, the transmitter is fixed. I don't think we can create a signal that looks like a real satellite that is actually moving. Therefore, we want to generate a false signal as if a fixed false signal transmitter were moving. In other words, we think that false Doppler is a mechanism to make a fixed transmitter appear to be moving.

Sorry if I was confused.

Imtiaz08 commented 1 year ago

Yes, it is definitely possible to add fake doppler the way that you've described. You will need to use advanced techniques such as the Kalman filter or machine learning models to predict the previous states and estimate the new stats.

It isn't easy to do but it is definitely possible I think

IvanKor commented 1 year ago

It isn't easy to do but it is definitely possible I think

Doppler shift https://github.com/osqzss/gps-sdr-sim/issues/54