常规合成孔径雷达（ＳＡＲ）利用线性调频信号获得纵向距离高分辨，但一般要求系统瞬时大带宽和高速Ａ／Ｄ变换器。目前引起雷达界广泛关注的步进频率脉冲串波形可以在不要求系统瞬时大带宽和高速Ａ／Ｄ采样率的情况下获得径向距离高分辨［１］。着重研究分析此种波形在ＳＡＲ中的应用及其多普勒效应并提出一种纵向距离合成高分辨成像时的多普勒二次相位的补偿方法，从而消除了纵向距离分辨率的恶化和信噪比损失 Conventional Synthetic Aperture Radar (SAR) uses the chirp signal to obtain high resolution of the longitudinal distance, but generally requires a system of instantaneous large bandwidth and high speed A / D converters. At present, the step-frequency burst waveform, which has drawn much attention in the field of radar, can obtain high-resolution radial distance without requiring the system instantaneous large bandwidth and high-speed A / D sampling rate [1]. This paper focuses on the application of the waveform in SAR and its Doppler effect and proposes a compensation method of Doppler quadratic phase in longitudinal distance synthesis and high resolution imaging so as to eliminate the deterioration of the vertical distance resolution and signal Noise ratio loss