Abstract:

In real-world application, the time of a single radar scan is usually shorter than the target rotation period. For this situation, a method is proposed for estimating the micro-Doppler parameter of scanning-beam radar targets based on a fractional period. The micro-Doppler signal of a rotation target can be expressed by a sinusoid. The fractional period micro-Doppler signal is extracted from the time-frequency domain of the echo signal. By using the properties of sine, the rotation rate and rotation amplitude of the target can be estimated. With these two parameters, the rotation radius also can be given. As the intrinsic characteristics of the target, the rotation radius reflects the structure information and motion characteristics of the target and provides effective basis for the recognition and classification of the target. The robustness and validity of the proposed method are evaluated by simulation results and experimental data.