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Cyclic spectrum estimation cross term suppression method

A cyclic spectrum and cross-term technology, applied in the field of spectrum estimation, can solve the problem of not being able to obtain

Pending Publication Date: 2020-04-10
HOHAI UNIV
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Problems solved by technology

However, the cyclic spectrum estimation of the modulation frequency of each interference signal will produce cross terms, so that we cannot obtain information about the parameters of each signal

Method used

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  • Cyclic spectrum estimation cross term suppression method
  • Cyclic spectrum estimation cross term suppression method
  • Cyclic spectrum estimation cross term suppression method

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Experimental program
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Embodiment

[0122] Validation of complex electromagnetic environment suppression cross-terms by computer simulation. Use AM signal and BPSK signal to simulate the electromagnetic environment in which the radar works, and simulate the carrier frequency f of the AM signal used c1 is 1800MHz, the amplitude A of the carrier signal is 1.2, the initial phase of the carrier signal is 0; the modulation signal frequency f 0 is 10MHz, the modulation degree λ is 0.15, the initial phase of the modulated signal is 0; the code rate R of the BPSK signal b 150Mbps, initial phase is 0, the carrier frequency f c2 The frequency is 1500MHz, and the number of symbols is 1500. In order to more intuitively and clearly analyze the impact of the cross term on the analysis signal cyclic spectrum, the cyclic spectrum is judged by the decibel value.

[0123] figure 2 For the cyclic spectrum estimation results of AM signal and BPSK signal, the power of the cross term is -4.192dB. image 3 For the cyclic spectr...

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Abstract

The invention discloses a cyclic spectrum estimation cross term suppression method. The method comprises the steps of collecting a complex electromagnetic environment signal ren (t); carrying out EMDdecomposition on the collected complex electromagnetic environment signal ren (t) to obtain a series of IMF components; respectively calculating cyclic spectrum estimation of each IMF component; and performing linear accumulation on the cyclic spectrum estimation of each IMF component to obtain the cyclic spectrum estimation of the original complex electromagnetic environment signal. The method has the advantages that the cross term can be effectively suppressed, the resolution of each interference signal spectrum is improved, and the precision of detecting the interference frequency band is improved.

Description

technical field [0001] The invention relates to a suppression method for cyclic spectrum estimation cross term, which belongs to the technical field of frequency spectrum estimation. Background technique [0002] In the radar electromagnetic environment, the prior information of various radiation sources is unknown, there are many types of emission waveforms, and there are various forms of interference signals. Research on high-precision electromagnetic environment signal spectrum estimation method is the core of improving radar anti-interference ability. The second-order cyclic spectrum estimation has low complexity, fast calculation speed and strong anti-noise ability, and can transform complex nonlinear signals to make them present certain periodicity. When calculating the cyclic spectrum estimation of complex electromagnetic environment interference signals, cross terms are inevitably generated. The existence of cross terms affects the normal spectrum distribution of th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36G01S7/02
CPCG01S7/36G01S7/023
Inventor 胡居荣陆龙祝怡翔周寒瑜高放
Owner HOHAI UNIV