正负频率步进信号精确测速算法

利用正负频率步进信号特殊的信号波形，提出了一种复合测速算法。其核心思想是从不同的角度巧妙地利用回波间的相关性，通过分析与速度有关的相位或距离信息完成目标速度估计。所提算法不仅有效地利用了运动目标帧间距离走动的信息，还充分利用了运动目标在正负频率步进信号体制下耦合时移相反的特性，其结果能够直接实现高速运动目标的精确测速，完成目标微动特性的测量。仿真结果证明了所提算法的有效性。

Accurate velocity measurement of up-down stepped frequency signal

A composite algorithm of velocity measurement is proposed by using the specific waveform of the up-down stepped frequency signal. The main idea is that the algorithm skillfully uses the correlation of echo from different aspects, and then acquires the radial velocity from the phase or range result related with velocity. The proposed algorithm not only exploits the information of the range shift between two frames, but also takes advantage of the feature that the moving target has different coupled time shift under the condition of up-down stepped frequency signal. The result shows that the proposed algorithm can realize the accuracy measurement of high speed moving target, and fulfill the purpose of the micro motion measurement, which is verified by simulation.