雷达间歇调制信号及其性能分析

Interrupted-Modulation Radar Signal and its Performance Analysis

提出雷达间歇调制信号的基本原理,分析了间歇调制信号的模糊函数。在此基础上,提出并实现了一种基于通断编码的间歇调制信号,分析了这种新型信号的分辨率和影响通断编码信号性能的关键因素。进行了相应的理论和数学仿真,结果表明,对于矩形单载频信号,间歇调制能有效改小距离分辨盲区,而对速度分辨率没有影响;另一方面,这种新型调制信号的距离分辨率主要由编码位数决定,且位数越大,距离分辨率越高,而码元排序主要影响信号模糊函数的旁瓣。这些结论对大时宽带宽信号的内场测试与仿真、新型雷达信号设计与应用具有重要的参考价值。

The basic principle of interrupted-modulation radar signal was proposed and its ambiguity function was analyzed. On this basis,a sort of interrupted-modulation signal based on break-make encoding was proposed and realized,resolution of this new type signal and the key factors influencing the performance were analyzed. The corresponding theory and mathematical simulation result shows that interrupted-modulation can reduce the distance resolution blind spots of single carrier frequency rectangle pulse signal but does not affect the speed resolution. The result also shows that range resolution of interrupted-modulation signal based on break-make encoding is mainly decided by the coding bit,the higher the bits,the greater range resolution,and the sequence of code symbol mainly affects the signal sidelobe of ambiguity function. These conclusions have important reference value for the test and simulation of large timebandwidth signal,and the conclusions also guide the new types radar signal design and application.