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globsky / greta-oto

An open source GNSS receiver
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Change doppler range #9

Closed iceberg1369 closed 2 years ago

iceberg1369 commented 2 years ago

Where is paramaters to change doppler from 5khz to 10khz for example

globsky commented 2 years ago

The baseband process hardware does not have any limitation on Doppler range. Could you give a more specific description on where will you need to set Doppler range?

iceberg1369 commented 2 years ago

I need to plot code phase vs doppler and I need to narrow down doppler range. Eg 2khz for the sake of less computing power

globsky commented 2 years ago

If what you are asking is the acquisition engine search range, you can find it at line 140 of FirmwarePortal.c: "AcqConfig.StrideNumber = 19;", which gives +-5kHz search range. Actually, the Doppler comes from the signal source, so reduce the range may cause some satellite failed to be acquired.