the problem of frequency_offset about dji_droneid HOT 2 OPEN

Thank you very much for your reply. I roughly understand.

from dji_droneid.

It's where in the baseband collect that the signal resides. So, if the signal you wanted was at 2.4445GHz and that's what you set your SDR to, then the frequency_offset variable does not apply to you (leave it at 0). However, if your SDR has a really bad LO spike and you had to tune up or down before recording then you will need to use frequency_offset. Example: You have a sampling rate of 30.72e6, and you tuned the SDR to 2.4445 GHz + 15 MHz (2.4595 GHz) then you would use a frequency_offset value of 15e6 (or maybe -15e6, not totally clear to me right now).

Basically the frequency_offset value is there to center the signal in baseband before being processed should there be an offset after the recording. It is not for dealing with very small frequency offsets that just exist in any RF communications as that is handled by the CFO estimation logic.

from dji_droneid.