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Self-adaption wave beam forming method of broadband array under main lobe jamming

An adaptive beam and main lobe interference technology, which is applied in the field of target detection and adaptive beam forming, can solve the problems of increasing computing burden and inability to suppress side lobe interference, and achieve correct main lobe peak pointing, constant main lobe width, and realization of The effect of main lobe conformality

Active Publication Date: 2019-03-19
XIDIAN UNIV
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Problems solved by technology

This method can effectively suppress the main lobe interference while ensuring that the main lobe width of the pattern is constant, but it cannot suppress the side lobe interference; and the second-order cone programming is introduced to obtain the weight coefficient, thus increasing the computational burden

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  • Self-adaption wave beam forming method of broadband array under main lobe jamming
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  • Self-adaption wave beam forming method of broadband array under main lobe jamming

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Embodiment Construction

[0050] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0051] refer to figure 1 , the broadband array adaptive beamforming method under the main lobe interference of the present invention, comprises the following steps:

[0052] Step 1, estimate the main lobe interference angle according to the Capon spatial spectrum estimation method.

[0053] (1a) Suppose there is a linear array composed of M array elements, the array element spacing is d, there are D sidelobe interference signals and one main lobe interference signal with the same bandwidth in the space, and the reference frequency f is selected within the signal bandwidth 0 , the main lobe width θ of its static pattern is estimated by the following formula 3dB :

[0054]

[0055] Among them, θ B is the array scanning angle, c is the speed of light, and (°) means that the unit is degree;

[0056] (1b) Let the received signal of...

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Abstract

The invention discloses a self-adaption wave beam forming method of a broadband array under main lobe jamming, and aims at solving the problems of peak displacement, main lope widening and side lope elevating when main lope jamming inhibiting is conducted in the prior art. The method is characterized in that a Capon spectral estimation method is utilized to estimate a main lope jamming direction;main lope jamming components of a signal is eliminated through a blocking matrix; focusing processing is conducted on the signal on which main lope jamming eliminating is conducted, and a covariance matrix of a focus output signal is reconstructed; the reference frequency optimum weight under the constraint condition of constant main lope sub spatial projection is solved; focusing invert transformation is conducted on the reference frequency optimum weight to obtain corresponding weight vectors of each frequency, the signal is weighted, and a wave beam forming output signal of the array is obtained. The method has the advantages that main lope jamming and side lope jamming are effectively inhibited, main lope shape preserving of a directional diagram is achieved, side lope level is reduced, the computation efficiency is improved, and the method can be used for target detecting in a complicated jamming environment.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to an adaptive beam forming method, which can be used for target detection. Background technique [0002] Broadband array adaptive beamforming technology has a wide range of applications in radar, communication, sonar and other fields. When the interference is located in the sidelobe region, the broadband array adaptive beamforming method can show good performance. However, when the interference is located in the main lobe area, the traditional broadband array adaptive beamforming algorithm will produce problems such as main beam peak offset, too high side lobes of the array pattern, and beam distortion, which seriously affect the performance of the algorithm. [0003] Many literatures and studies in recent years have pointed out that applying the method based on blocking matrix preprocessing BMP to broadband arrays can effectively suppress the main lobe interferenc...

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Application Information

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IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 罗丰毛家琪戈雅帅崔凯聂学雅聂春梅
Owner XIDIAN UNIV
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