Bistatic radar multichannel combination dimension reduction clutter suppression method based on MIMO

A multi-channel, bistatic technology, applied in the field of radar, can solve problems such as the inability to realize real-time processing, the large amount of calculation for full-dimensional processing, and the large number of independent and identically distributed clutter samples.

Inactive Publication Date: 2013-10-16
XIDIAN UNIV
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Problems solved by technology

The disadvantage of this method is that the calculation amount of the full-dimensional processing is large, and the number of independent and identically distributed clutter samples is large, and real-time processing cannot be realized in practical applications.

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  • Bistatic radar multichannel combination dimension reduction clutter suppression method based on MIMO
  • Bistatic radar multichannel combination dimension reduction clutter suppression method based on MIMO
  • Bistatic radar multichannel combination dimension reduction clutter suppression method based on MIMO

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Embodiment Construction

[0037] The geometric configuration of the front and side looking bistatic MIMO radar used in the present invention is as follows figure 2 As shown, the origin of the coordinate system O r is the projection point of the receiver on the horizontal plane, and the x-axis is the receiver speed v 2 The direction of the receiver's position is (0,0,h r ), O t The point is the projection point of the transmitter on the horizontal plane, and the position coordinates of the transmitter are (Lb cos γ,L b sinγ,h t ), γ is the azimuth angle of the transmitter, L b as baseline O r o t the length of v t is the velocity of the transmitter, is the angle between the transmitter velocity vector and the x-axis, P is the i-th clutter point within a given range gate, θ r,i and θ t,i are the transmitting azimuth and receiving azimuth of the clutter point, φ r,i and φ t,i are the emission elevation angle and reception elevation angle of the clutter point respectively, ψ r,i and ψ t,i a...

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Abstract

The invention discloses a bistatic radar multichannel combination dimension reduction clutter suppression method based on MIMO. By using a current bistatic MIMO radar distance dependence clutter suppression method, an operation amount is large and the number of needed independent identically distributed samples is high. By using the method of the invention, the above problems are mainly solved. Realization steps are characterized in that (1) a transmitted waveform is used to carry out matched filtering on echo data of the radar; (2) a multichannel combination dimension reduction matrix is constructed and dimension reduction processing is performed on the received data; (3) the data after the dimension reduction is used to estimate a clutter covariance matrix; (4) according to a space-time adaptive processing principle, an optimal weight vector is obtained; (5) the optimal weight is used to weight the data after the dimension reduction, the background clutter is suppressed and a target signal is detected. Compared to an existing full-dimension processing method, by using the method of the invention, there are the advantages that a computation complexity is low; a requirement to the number of the independent identically distributed samples is low and clutter suppression performance is good. The method can be used in bistatic radar ground target detection of the MIMO.

Description

technical field [0001] The invention belongs to the technical field of radar, and further relates to a multi-channel joint dimensionality reduction clutter suppression method for a front-side-looking bistatic multiple-input multiple-output MIMO radar, which can be used for dimensionality reduction suppression of ground clutter and to realize detection of ground targets. Background technique [0002] Radar is an indispensable electronic equipment in modern life. Bistatic radar has the advantages of concealed detection, anti-jamming, and anti-fading due to the separate structure of the receiver and transmitter systems. It is also conducive to the detection of stealth targets. But also because of this geometric structure, the distribution of the clutter power spectrum changes with the distance, showing the non-stationary characteristics of distance, that is, the clutter sampling data of different range gates do not satisfy the independent and identical distribution condition, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
Inventor 李军刘长赞党博伊孟磊廖桂生
Owner XIDIAN UNIV
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