分布式相参雷达LFM宽带去斜参数估计方法

Distributed Coherent Radar LFM Wideband Stretch Parameter Estimation Method

宽带分布式相参雷达技术能够有效提升目标测量精度和识别性能,具有重要的研究价值。针对现有雷达装备一般不具有同时对正负调频率宽带线性调频信号进行去斜处理的能力,即在接收相参合成阶段无法通过正负调频率宽带去斜方式获取宽带信号发射相参所需延时相位值的问题,该文利用单元雷达与目标之间存在延时差,将单元雷达发射的宽带线性调频信号等效为目标信号,对接收信号进行互相关处理获取发射相参合成所需的参数值,通过建模和仿真实现接收相参和发射相参合成处理,并对飞机目标进行1发2收相参探测试验,获得了理想的试验结果。该方法具有估计精度高、运算量小和时实性好的优势,可应用于分布式相参雷达工程实现。

Wideband distributed coherent radar technology can effectively improve the target measurement accuracy and recognition performance, and has important research value. For the existing radar equipment generally does not have the ability to stretch the positive and negative frequency modulation rate wideband LFM signal simultaneously, that is the problem that the delay phase value of wideband signal transmit coherent can not be obtained by wideband stretch method in receive coherent synthesis phase. This article uses the delay difference between the unit radar and the target, equivalents the unit radar transmitting wideband LFM signal to the target signal, performs cross-correlation processing on the received signal to obtain the value of transmit coherent parameter. Through modeling and simulation receiving coherent and transmitting coherent synthesis processing are realized, and the two input single output coherent detection test of the aircraft target is carried out, and the ideal test results are obtained. The method has the advantages of high estimation accuracy, small calculation amount and good real-time performance, can be applied to distributed coherent radar engineering implementation.