I have two peaks in my doppler signal. 1 @ zero and other @ actual velocity.

I am building radar data cube. when I process the signal in slow-time it gives me the doppler velocity @ 2 locations. one @ zero and other @ 50m/s. velocity which I input is 50 m/s.

Please have a look. and advise. is this correct and what can be the problem. Regards

Answer 1

[Hassaan]

The Doppler spectrum you're observing shows two peaks: one at zero velocity, likely due to static objects, and another at the expected 50 m/s, indicating a moving target. The zero velocity peak is common and expected if there are stationary objects in the radar's field of view. If the 50 m/s peak is unexpected, it may be due to signal processing artifacts, system calibration issues, or ambiguities in velocity measurement due to the radar system's limitations. To verify the correctness of these observations, you should review the radar processing chain, conduct tests with known targets, check for calibration accuracy, and ensure the radar's ambiguity resolution is correctly applied.

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[Waseem]

There is only one target which is moving at 50 m/s. there is no stationery target in the system.

Answer 2

[Star Strider]

I am not certain what your data are, however the ‘peak’ at D-C (0 Hz) is likely the result of a constant D-C offset.

Subtracting the mean of your signal from the rest of the signal first (before calculating the Fourier transform) can eliminate it.