Multichannel radar interference inhibition and then target detection method during coexistence of clutter and interference

A technology of interference coexistence and interference suppression, applied in radio wave measurement systems, climate sustainability, instruments, etc., can solve problems such as target detection problems of multi-channel active phased array radars

Active Publication Date: 2019-03-08
AIR FORCE EARLY WARNING ACADEMY
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Problems solved by technology

[0005] The purpose of the present invention is to solve the multi-channel active phased array radar target detection problem when there are clutter and interference at the same time

Method used

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  • Multichannel radar interference inhibition and then target detection method during coexistence of clutter and interference
  • Multichannel radar interference inhibition and then target detection method during coexistence of clutter and interference
  • Multichannel radar interference inhibition and then target detection method during coexistence of clutter and interference

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Embodiment Construction

[0016] Detailed steps of the present invention are as follows:

[0017] (1) Increase the reconnaissance pulse during the rest period of the radar, and use methods such as multiple signal components to obtain the number of interference and the corresponding azimuth information. Assume that there are q interferences, and the angles of the interferences relative to the normal direction of the radar array are θ 1 , θ 2 ,...,θ q .

[0018] (2) Use the detected number and orientation information of interference to construct the interference steering matrix

[0019] J=[j 1 , j 2 ,...,j q ] (1)

[0020] Among them, the dimension of the interference steering matrix J is N×q, N is the number of radar system channels, j m is the steering vector of the mth interference (m=1, 2, ..., q), its expression is

[0021]

[0022] Among them, d is the distance between radar array elements, λ is the wavelength corresponding to the radar transmitting signal, j is the imaginary number uni...

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Abstract

The invention discloses a multichannel radar interference inhibition and then target detection method during coexistence of clutter and interference. Interference inhibition, clutter inhibition and CFAR (constant false alarm rate) detection area realized on the basis of the idea of multichannel adaptive detection. The number and direction of interference are obtained by means of reconnaissance pulses in a rest period of a radar, singular value decomposition is carried out on an interference guiding matrix, and an interference inhibition matrix is constructed; the interference inhibition matrixis used to carry out interference inhibition on to-be-detected data and a training sample, the dimension of data is reduced, and requirement for the number of training samples during subsequent adaptive detection is lowered; according to a generalized likelihood ratio criterion, the to-be-detected data and training sample after interference inhibition are combined to detect design of a detector;and a detection threshold is determined according to statistical characteristic of the detector and the false alarm rate set by the system, and compared with a detection statistic quantity of the detector, if the detection statistic quantity is greater than the threshold, it is determined that there is a target, and otherwise, it is determined that there is no target. Thus, interference inhibition, clutter inhibition and CFAR detection can be realized at the same, time, and work is normal when the number of training samples is lower than the number of system channels.

Description

technical field [0001] The invention relates to a multi-channel radar target detection method after interference suppression when clutter and interference coexist, and is especially suitable for active phased array radars. Background technique [0002] In addition to the possible target signal and unavoidable noise, there are generally clutter in the radar received data. Clutter is mainly caused by radar echoes from objects such as ground clutter, vegetation, and tall and isolated buildings. Compared with the weak radar signal echo, the echo intensity of clutter is much greater, and can reach the order of 1 million times stronger than the radar echo (that is, the noise-to-noise ratio is 60 decibels). Therefore, the presence of clutter makes it difficult for radars to detect targets. In addition, there may also be unintentional interference such as interference released intentionally by the enemy or communication stations of friendly neighbors in the radar echo. One of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02G01S7/41
CPCG01S7/023G01S7/414G01S7/418
Inventor 刘维建王永良段克清杜庆磊周必雷唐瑭
Owner AIR FORCE EARLY WARNING ACADEMY
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