Multi-band high frequency dual-chirp waveform generation method

doi:10.3969/j.issn.1007-5461.2025.05.008

Abstract

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 dualchirp 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.

Key words: optical communications, dual-parallel Mach-Zehnder modulator, dual-chirp signal, microwave photonics, multi-band

CLC Number:

TN929.1

XING Yuhua, SHI Tengfei. Multi-band high frequency dual-chirp waveform generation method[J]. Chinese Journal of Quantum Electronics, 2025, 42(5): 663-676.

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