基于速度滤波的杂波抑制步进频率波形设计研究

杂波是影响高分辨雷达宽带一维距离像成像性能的重要因素。强杂波可能会造成目标点遮盖和虚假目标点,影响雷达的检测性能。针对步进频率成像杂波抑制问题开展波形研究,提出了一种抑制杂波的步进频率(CS-SF)新波形。CS-SF发射波形为组内同频、组间步进的脉冲串,利用目标与杂波的速度差异,通过组内加权抑制杂波,组间离散傅里叶逆变换(IDFT)提高距离分辨率。详细分析了该波形抑制杂波的原理和信杂比改善理论值,给出了CS-SF波形信号处理流程,建立了单目标杂波模型和扩展目标杂波模型。通过仿真验证了CS-SF抑制杂波的有效性,信杂比改善实际值符合理论值。

Study on Stepping Frequency Waveform Design for Clutter Suppression Based on Velocity Filtering

Clutter is an important factor that affects the imaging performance of one-dimensional distance image of high-resolution radar. Strong clutter may cause target point coverage and false target points, affecting the detection performance of radar. In this paper, a new clutter suppression stepped frequency (CS-SF) waveform is proposed to suppress the clutter. CS-SF emission waveform is a pulse string with the same frequency within the group and the stepped frequency between groups. Based on the velocity difference between the target and the clutter, the clutter is suppressed by weighting within the group, and the distance resolution is improved by inverse discrete Fourier transform (IDFT) between groups. The principle of the clutter suppression and the theoretical improvement value of the signal-to-clutter ratio are analyzed in detail. The CS-SF waveform signal processing flow is given, and the single-target clutter model and the extended target clutter model are established. The validity of CS-SF is verified by simulation, and the actual improvement value corresponds to the theoretical value.