Fractional order Fourier domain channelized receiving method
A technology of fractional Fourier transform and receiving method, which is applied in the field of radar reconnaissance, can solve the problem of high signal-to-noise ratio in signal processing, and achieve the effect of improving signal-to-noise ratio
Inactive Publication Date: 2012-11-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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[0005] Aiming at the problem that the energy of the broadband chirp signal overflows to multiple channels in the traditional Fourier domain channelization receiving method, the signal-to-noise ratio of the subsequent signal processing is too large, the present invention proposes a fractional Fourier domain channelization receiving method
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[0029] The implementation flow chart of the fractional-order Fourier domain channelization receiving method proposed by the present invention is as follows figure 1 As shown, the system structure diagram is as follows figure 2 shown. First, according to the characteristics of the observed broadband signal, select the transformation order p of the channelized receiver in the fractional Fourier domain and the counterclockwise rotation angle of the fractional Fourier domain relative to the Fourier domain α=pπ / 2 , the time-domain sampling interval Δt, the number of channels K and the extraction factor M, and K=MF, F is a positive integer, select a low-pass filter h with a passband cutoff frequency of π / K and a stopband cutoff frequency of 2π / K L (n) is a low-pass prototype filter for channelized reception, and h is obtained from formula (1) L K polyphase components of (n) {g l (n)} l＝0，1，...，K-1 ;
[0030] On this basis, concrete realization steps of the present invention ar...
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The invention relates to a fractional order Fourier domain channelized receiving method, which belongs to the technical field of radar reconnaissance. A fractional order Fourier domain filter is utilized to analyze input signals extracted in a delay mode on the basis of the focusing performance of fractional order Fourier transform on non-stationary signals, and then chirp modulation and inverse discrete Fourier transform are carried out on the output signals of the filter to obtain final system output signals. The fractional order Fourier domain channelized receiving method solves the problem of the existing channel receiving method that energy is overflowed to a plurality of channels when wideband LFM signals are processed, increases the signal-to-noise ratio of follow-up signal detection and parameter estimation, effectively keeps the wave shapes of the intercepted signals, has equivalent computation complexity with a conventional channelized receiving method, and provides an effective tool for the reconnaissance of wide-band radar signals under the environment with low signal-to-noise ratio.
Description
technical field [0001] The invention relates to a channelized receiving method in a fractional Fourier transform domain, which belongs to the technical field of radar reconnaissance. Background technique [0002] In modern warfare, radar countermeasures are playing an increasingly important role. Radar countermeasures are divided into two parts: radar reconnaissance and radar jamming. Radar reconnaissance is a technical measure to obtain technical parameters, location, type, deployment and other information by using special electronic equipment on various platforms to intercept, measure, analyze, identify and locate enemy radar radiation signals. On the one hand, the information obtained by radar reconnaissance provides a basis for formulating electronic countermeasures and developing radar countermeasure equipment, and on the other hand, it also provides a basis for commanders to identify threats to radar or the status of radar-controlled weapon systems and then make judgm...
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IPC IPC(8): G01S7/285G01S7/295
Inventor 陶然孟祥意赵兴浩王越
Owner BEIJING INSTITUTE OF TECHNOLOGYGY