摘要
Abstract
Aiming at the problems of single carrier frequency band and low bandwidth frequency multiplication of linear frequency modulation(LFM)signal in radar system,a method of generating dual-chirp linear frequency modulation signal is proposed.The method uses dual-parallel Mach-Zehnder modulators cascaded with a Mach-Zehnder modulator to generate dual-chirp LFM signals with center frequencies of two,six and ten times the frequency of the RF driver signal,while increasing the bandwidth by four times.The proposed method is simulated and verified,and the dual-chirp LFM signals with a bandwidth of 4 GHz,center frequencies of 20 GHz,60 GHz and 100 GHz,and a time bandwidth product(TBWP)of 742.4 are generated.Furthermore,autocorrelation processing and ambiguity function performance analysis are performed on the generated signals,and the results show that the signals exhibit good peak sidelobe ratio and pulse compression performance,and the ambiguity function is reduced to 1/4 of that of single chirp frequency modulation signals,which effectively reducing the target location error caused by range-Doppler coupling effect and improving the detection performance of the radar system.关键词
光通信/双平行马赫-曾德尔调制器/双啁啾信号/微波光子/多频段Key words
optical communications/dual-parallel Mach-Zehnder modulator/dual-chirp signal/microwave photonics/multi-band分类
信息技术与安全科学
