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High-speed maneuvering target detection method based on discrete linear frequency modulation Fourier transform

A technology of linear frequency modulation and maneuvering targets, applied in the field of radar, can solve the problems of blind speed sidelobe, high computational complexity, and inapplicability, so as to avoid the loss of accumulation gain, increase coherent accumulation time, and reduce computational complexity Effect

Active Publication Date: 2017-12-08
XIDIAN UNIV
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Problems solved by technology

Although the existing Keystone-cubic phase function KT-CP method, Radon-fractional ambiguity function RFRAF method, and Radon-linear standard ambiguity function RLCAF method can compensate for the Doppler migration caused by jerk, but because of the Non-linear, not suitable for low signal-to-noise ratio environments
At present, the best accumulative performance is the generalized Radon-Fourier transform GRFT method, but when this method is applied to the detection of ground-based radar, the blind speed sidelobe phenomenon will appear, which has a great impact on the judgment of the number of targets and the probability of false alarms , and the calculation complexity of this method is very large, which brings great inconvenience to the detection of high-speed maneuvering targets

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  • High-speed maneuvering target detection method based on discrete linear frequency modulation Fourier transform

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Embodiment Construction

[0030] The embodiments and effects of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] refer to figure 1 , the implementation steps of the present invention are as follows:

[0032] Step 1: Demodulate and pulse compress the radar echo.

[0033] Receive radar echo Perform demodulation and pulse compression preprocessing on the echo in turn to obtain the preprocessed echo data

[0034]

[0035] Among them, n=1,2,...,N, m=1,2,...,M, Indicates the nth sampling point in the fast time domain, t m Represents the mth sampling point in the slow time domain, N represents the number of sampling points of a pulse, M represents the total number of transmitted pulses, j is the imaginary number unit, f c is the carrier frequency of the transmitted signal, is the symbol of the convolution operation, Chirp signal transmitted by radar.

[0036] Step 2: Echo data after pulse compression Do a fast Fourier tr...

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Abstract

The invention discloses a high-speed maneuvering target detection method based on discrete linear frequency modulation Fourier transform. The method comprises the steps that 1 a radar echo is received, and demodulation and pulse pressure processing are carried out on the radar echo; 2 in the fast time domain, Fast Fourier transform and Keystone transform are carried out on the echo signal in order; 3 the search range, interval and number of the speed fuzzy number, the linear frequency modulation slope and the secondary frequency modulation slope are initialized, and a fuzzy speed compensation function is built; 4 Keystone transformed data are multiplied by the fuzzy speed compensation function, and then fast inverse Fourier transform is carried out in the fast time domain; 5 improved discrete linear frequency modulation Fourier transform is carried out on the data processed in the step 4; and 6 the steps of 4 and 5 are repeated until the search of the speed fuzzy number is completed, and a detection unit diagram is constructed for constant false-alarm detection. The method provided by the invention has the advantages of better detection performance and smaller calculation amount, and can be used for remote early warning of a ground-based radar.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a method for detecting a high-speed maneuvering target, which can be used for remote early warning of ground-based radar. Background technique [0002] With the continuous development and utilization of near-space resources, the detection of near-space hypersonic vehicles has gradually become a hot spot in the radar field. However, the radar cross section of these high-speed moving targets is very small, and they are typical stealth targets. At the same time, they are very maneuverable and have complex motion forms such as acceleration and jerk. These characteristics bring great challenges to the detection of ground-based radar. The detection of radar targets can be divided into two ways: coherent accumulation and non-coherent accumulation. Since coherent accumulation makes full use of the phase information of the target, it can improve the detection performance more than non-coh...

Claims

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Application Information

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IPC IPC(8): G01S7/292G01S7/41
CPCG01S7/292G01S7/41
Inventor 张林让林春辉刘楠黄响李升远
Owner XIDIAN UNIV
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