脉冲压缩雷达距离多普勒耦合对测距影响分析

Range Error Analysis of Range-Doppler Coupling Effect to LFM Radar

根据线性调频脉冲及其匹配滤波器的时域和频域特性,首先从原理上分析了线性调频雷达脉冲回波信号由于多普勒距离耦合的影响,经过匹配滤波器后产生附加延时而引起的测距误差。然后给出了距离多普勒耦合的雷达距离修正公式,并通过仿真和雷达实际跟踪数据对雷达距离修正公式进行了验证。最后给出了工程应用中校正脉压网络固定延迟、脉压网络输入端线性调频脉冲信号多普勒频率的变化以及正或负斜率线性调频脉冲信号等方面应注意的问题。

The mechanism about range-Doppler coupling effect based on time and spectrum characteristic to LFM matched filter is analyzed in this paper. When a LFM pulse passed through the matched filter, the output signal is compressed and delayed. An ranging error correction model is proposed because of range-Doppler coupling effect. Mter space target distance-measuring data an- alyzing and computer simulating, the actual result of this new error correction model of LFM range measure is certificated as the conclusion of this paper. The issues matched filter compression delay time, the variety of Doppler frequency which is input matched filter network, positive or negative slope LFM ranging error correction etc should pay more attention to in engineering application is also mentioned here.