I am working on the IQ raw data from FMCW radar. I plot the I and Q data, they seem to be strongly shifted from the center. And the amplitude of I and Q also varies. I don't understand why it looks like this. I think, they should local on the center and with fixed amplitude. Thank you very much if someone can help.
The IQ data from an FMCW radar would have the frequency difference from the delay between the transmitted and reflected signal given the transmitted signal is a changing frequency with time; so the result is what should be expected. Given the ramp rate of frequency the round trip delay from target can be determined from the frequency of this result.
The result here appears to have a stronger higher frequency AND lower frequency tone as the result of two different targets. The lower frequency that is superimposed would be due to the closer target.