调频步进频雷达中距离起点误差分析

Error Analysis of Beginning Sampling Range in Stepped Chirp Radars

调频步进频雷达通过宽带合成实现距离向高分辨,合成过程中精确的距离采样起点是保证合成性能的重要因素。该文指出了距离起点误差会在宽带合成信号中引入阶梯相位,从线性系统单位冲激响应的角度证明了该阶梯相位会导致宽带合成信号脉冲压缩后产生栅瓣,并就误差对栅瓣的包络、高度、分布情况和主瓣偏移的影响进行了定量分析。

Stepped chirp radars achieve high range resolution through bandwidth synthesis.Precise beginning sampling range is a significant factor which guarantees the performance of bandwidth synthesis.The effect of the beginning sampling range error on bandwidth synthesis is discussed by the way of impulse response of linear system.The beginning sampling range error introduces step phase errors which remain in the synthesized broad band pulses and result in grating lobes in the compression results.The effects on the envelope,height and distribution of the grating lobes and the shift of the main lobe are analyzed quantitatively.