Signal detection method under noise amplitude modulation interference based on fractional Fourier transform
A technology of fractional Fourier and noise amplitude modulation interference, which is applied in the field of communication, can solve the problems of narrow application range and complicated detection process, and achieve the effect of expanding the application range and simplifying the detection process
Active Publication Date: 2018-08-10
XIDIAN UNIV
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[0006] The purpose of the present invention is to overcome the defects in the above-mentioned prior art, and propose a signal detection method under noise amplitude modulation interference based on fractional Fourier transform, which is used to solve the detection problems existing in the signal detection method under noise amplitude modulation interference Technical issues with complex process and narrow application range
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[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0033] refer to figure 1 , the present invention comprises the following steps:
[0034] Step 1, collect the received signal and establish a signal model.
[0035] The signal acquisition system collects any received signal in the radar antenna through the receiver equipment of the continuous wave radar, which includes the linear frequency modulation target signal, noise amplitude modulation interference and white noise with the radar receiver equipment, and establishes any two adjacent pulses The receiving signal model of the repeating period, the implementation steps are:
[0036] Step 1a establishes the signal model of the collected received signal:
[0037]
[0038] Among them, A(t) is the signal amplitude of the chirp target signal, f 0is the initial frequency of the target signal; U 0 (t) is the carrier voltage of noise amplitude modulation inter...
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The invention provides a method of detecting signals under noise amplitude modulation interferences based on fractional order Fourier transform. The method is used to solve technical problems of a conventional method of detecting the signals under the noise amplitude modulation interferences such as complicated detection process and narrow application range. Received signals of two adjacent pulse repetition periods of a radar receiver are processed by adopting the fractional order Fourier transform, and an optimal value of an fractional order is determined, and then optimization of aggregation of linear frequency modulation objects after related processing is realized, and the signal detection is realized. The method comprises following concrete steps: 1, the acquisition of the received signals and establishing of a signal model; 2, the fractional order Fourier transform of the received signal model; 3, the related calculation of the fractional order Fourier transform model; 4, the optimization of the aggregation of the related function of the linear frequency modulation target signal. The method is advantageous in that the detection process is simple, the parameter estimation is not required, and the detection of the linear frequency modulation signal in the noise amplitude modulation interference background is realized.
Description
technical field [0001] The invention belongs to the field of communication technology, and relates to a technology combining fractional Fourier transform and correlation operation, in particular to a signal detection method based on fractional Fourier transform under noise amplitude modulation interference, which can be used to realize linear frequency modulation signal ( LFM) detection. Background technique [0002] There are many types of radar jamming, which are usually divided into active jamming and passive jamming, among which active jamming includes suppressive and deceptive jamming. Suppressive jamming is mainly to submerge the radar echo signal through random signals, so that the radar cannot effectively obtain the target echo information. In radar countermeasures, in order to achieve effective suppression of radar, noise modulation is usually used to generate interference signals, including the modulation of parameters such as amplitude, phase, frequency, and puls...
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IPC IPC(8): G01S7/292G01S7/36G01S7/41
CPCG01S7/292G01S7/36G01S7/41
Inventor 金艳王幸姬红兵
Owner XIDIAN UNIV