Anti-jamming method for frequency-agile radar based on whitening filter

A whitening filter and frequency-agile technology, which is applied in the field of radar and radar signal processing, can solve the problems that interference cannot be effectively suppressed, the energy of target echo signal is lost, and the probability of target detection is reduced, so as to improve the distance resolution and avoid false alarms. The effect of target interference

Active Publication Date: 2022-05-17
XIDIAN UNIV
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Problems solved by technology

The disadvantage of this method is that in the process of perceiving the interference environment, it relies heavily on the selection of the interference window. When the window is not selected properly, the interference cannot be effectively suppressed.
The disadvantage of this method is that while performing polarization cancellation to suppress interference, part of the energy of the target echo signal will be lost, resulting in a decrease in the probability of target detection

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  • Anti-jamming method for frequency-agile radar based on whitening filter
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  • Anti-jamming method for frequency-agile radar based on whitening filter

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] Refer to attached figure 1 , the specific implementation steps of the present invention are further described in detail.

[0031] Step 1, receiving an echo vector.

[0032] The frequency-agile radar transmits a linear frequency-modulated LFM signal vector whose carrier frequency hops randomly between adjacent pulses. In the same pulse repetition period PRI, the radar receives echo vectors containing targets, dense false target interference and noise.

[0033] The transmission signal of frequency-agile radar is:

[0034]

[0035] in, Indicates the transmitted signal, is the fast time, t m for slow time, is a rectangular window function, T p Represents the pulse repetition period, · ​​represents the multiplication operation, exp is the exponential operation with the base of natural logarithm, j is the imaginary number unit, π is the circumfe...

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Abstract

The invention discloses an anti-jamming method for frequency-agile radar based on whitening filtering. The realization steps are as follows: receiving echo signals containing target points to be detected, main lobe interference and noise; Baseband echo matrix; calculate the covariance matrix of the baseband echo matrix, and perform generalized eigenvalue decomposition; set the eigenvalue threshold according to the largest eigenvalue; select all eigenvalues ​​greater than the eigenvalue threshold and their corresponding eigenvectors to form whitening Matrix; multiply the whitening matrix with the baseband echo matrix to whiten and filter it; obtain the one-dimensional range image of the target by fast Fourier transform FFT. The invention can suppress the interference energy of dense false targets through whitening and filtering, while retaining the echo energy of the target, and can be used to improve the target detection probability of radar.

Description

technical field [0001] The invention belongs to the technical field of radar, and further relates to a frequency-agile radar anti-jamming method based on whitening filtering in the technical field of radar signal processing. The present invention can suppress the interference of dense false targets and detect the target of the frequency-agile radar. When the radar echo is mixed with the interference signal, the target energy is completely covered by the interference energy. By whitening and filtering the radar echo data, the purpose of suppressing interference can be achieved. . Background technique [0002] In the modern radar electronic battlefield, various methods such as suppressive jamming and towed deception jamming have seriously affected the radar seeker's ability to detect and guide targets, and many anti-jamming methods have emerged as the times require, and are widely used in the design of radar signal processing systems , electronic reconnaissance and electronic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41G01S7/36
CPCG01S7/41G01S7/418G01S7/36
Inventor 全英汇高霞陈侠达李亚超邢孟道董淑仙张瑞姚洪斌赵金珊
Owner XIDIAN UNIV
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