With the widespread application of the BeiDou satellite navigation system,the disadvantages of its susceptibility to interference have gradually become apparent.To address the problem of limited receiv-er sensitivity in traditional frequency domain interference detection methods,a weak interference detection technique based on dual-element cross-correlation is proposed.Firstly,models for cross-correlation detec-tion are established;secondly,through theoretical analysis and software simulation,the effects of jam-ming-to-noise ratio,jamming bandwidth,and cross-correlation integration time on the performance of in-terference detection based on dual-element cross-correlation are analyzed qualitatively and quantitatively;finally,the correctness of the theoretical analysis and the effectiveness of the proposed method are verified by practical measurements.Experimental results show that with an interference bandwidth of 20 MHz,the cross-correlation detection of 1 ms duration interference can effectively detect the interference with a power lower than-110 dBm in the electromagnetic environment,breaking through the detection bottle-neck of traditional frequency domain methods of-100 dBm.
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