双载频步进频率雷达精确速度测量方法

步进频率雷达中，目标的径向运动将导致合成的目标径向一维距离像产生距离徙动和波形失真，需要对目标速度进行测量以补偿其影响。该文提出基于单个步进频率脉冲串的共轭法速度测量方法，然后提出一种同时发射双载频步进频率信号的速度测量方法，并分析了其潜在测量精度。理论分析和仿真结果证明，两种方法相结合不仅具有普通步进频率信号的高距离分辨率等优点，而且具有速度测量无模糊测量范围大、测量精度高的特点，可以利用速度测量值补偿目标一维距离像的距离移动和失真，从而同时实现高速目标的速度精确测量和高分辨成像。

Precise Velocity Measurement Approach in Dual-Carrier-Frequency Stepped-Frequency Radar

In stepped frequency radar, the velocity of targets must be estimated and compensated to eliminate the range migration and distortion due to target moving. The conjugation method is presented for velocity measurement in stepped frequency radar. And a prototype of a stepped frequency system with dual carrier frequencies is proposed. With processing approach proposed, the system has both the advantage of high range resolution of stepped frequency radar and the capability of high precise velocity measurement. The estimated velocity can be used to compensate range migration and distortion in radar imaging. Therefore, the dual-carrier-frequency stepped-frequency radar can achieve high precise velocity measurement and high resolution simultaneously.