Radon-Fourier transformation (RFT) blind speed side lobe (BSSL) suppression method

A Fourier transform and blind speed side lobe technology, applied in the field of Laden Fourier transform blind speed side lobe suppression, can solve the problems of inconvenient design and implementation of signal models and processing algorithms, inability to detect targets, and affecting detection performance, etc. To achieve the effect of easy engineering implementation, reduced false alarm probability, and simple algorithm

Active Publication Date: 2019-07-23
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, in practical applications, affected by factors such as discrete pulse sampling, limited range resolution, and limited number of accumulated pulses, the output of RFT processing is always accompanied by blind speed side lobes (BSSL), which will bring large false targets , seriously affecting the final detection performance
In order to suppress the blind speed sidelobe, researchers have proposed some methods one after another. For the w

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  • Radon-Fourier transformation (RFT) blind speed side lobe (BSSL) suppression method
  • Radon-Fourier transformation (RFT) blind speed side lobe (BSSL) suppression method
  • Radon-Fourier transformation (RFT) blind speed side lobe (BSSL) suppression method

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[0023] Refer to the attached figure 1 , a Raden Fourier transform blind speed side lobe suppression method proposed by the present invention is specifically realized through the following steps:

[0024] Step 1, the radar system alternately transmits chirp signals of three different PRIs, receives radar echo signals, and performs demodulation and pulse compression on the radar echo signals.

[0025] In this embodiment, the chirp signal transmitted by the radar is s t (t), the received radar echo signal is s r (t,τ), where τ=2r(t m ) / c is the target signal delay, r(t m )=r 0 +v 0 t m , r 0 and v 0 are the initial distance and speed of the target, respectively. where, t m =mT r Refers to "slow time", m=0,1,2,...N m -1 is the number of slow time accumulation cycles, T r is the pulse repetition time. t=nt s Refers to "fast time", n=0,1,2,...N n -1 is the number of fast time sampling points, t s is the fast time sampling interval.

[0026] The echo signal is demod...

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Abstract

The invention discloses a Radon-Fourier transformation (RFT) blind speed side lobe (BSSL) suppression method. The method comprises the steps that a radar system alternately transmits three linear frequency modulation signals of different pulse recurrence intervals (PRIs), radar echo signals are received, and demodulation and pulse compression are conducted; according to the principle of RFT, the radar echo signals corresponding to the three PRIs are subjected to RFT processing, and thus three sets of long-time phase-coherent accumulation speed-distance two-dimensional results are obtained; theminimum values of the three sets of RFT processing results are taken in pairs for processing, and three sets of minimum value results are obtained; and the maximum value of the three sets of minimumvalue results is taken, and thus a final processing result is obtained, and BSSL suppression is achieved. According to the method, BSSL suppression is achieved, the false alarm probability is decreased, and thus the system detection probability is increased.

Description

technical field [0001] The invention relates to the field of radar signal processing, in particular to a blind speed side lobe suppression method of Laden Fourier transform. Background technique [0002] In radar signal processing, the long-term accumulation of signals can effectively improve the signal-to-noise ratio of the system and improve the detection ability of low-observable targets. There are two types of long-term accumulation algorithms, coherent accumulation and non-coherent accumulation. Among them, the performance of coherent accumulation is better than that of non-coherent accumulation. It is an optimal energy accumulation method and has been extensively and deeply studied by many scholars. [0003] Moving target detection (MTD) is the most commonly used coherent accumulation algorithm, which is simple and efficient, but when the target moves within a coherent accumulation period, the MTD algorithm is no longer applicable. In order to solve this problem, a me...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/415
Inventor 金添宋永坤宋勇平李浩然何大全武晨
Owner NAT UNIV OF DEFENSE TECH
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