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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