A sum and difference beam forming method based on a space-time adaptive processing radar

A space-time self-adaptive, differential beam technology, applied in the field of signal processing, can solve the problems of main lobe response distortion and affecting single pulse ratio, etc.

Active Publication Date: 2016-12-14
XIDIAN UNIV
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Problems solved by technology

[0006] In the background of clutter, the main lobe response of the above two methods will be distorted, which will seriously affect the monopulse ratio. Therefore, it is necessary to reasonably constrain the main lobe of the sum and difference beam to achieve the main lobe shape preservation of the sum and difference beam.

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  • A sum and difference beam forming method based on a space-time adaptive processing radar
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  • A sum and difference beam forming method based on a space-time adaptive processing radar

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[0044] The embodiments and effects of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0045] refer to figure 1 , the realization steps of the present invention are as follows.

[0046] Step 1: Input the sampled data X of the target detected by the STAP radar into the signal processor for space-time adaptive processing.

[0047]The sampling data X contains target, clutter and noise, and is composed of space-time snapshot vector x(p), p=1,...,L, where L is the number of sampled snapshots, and each space-time snapshot vector contains different Sampled data of antenna and different pulses.

[0048] Step 2, estimate the sampling covariance matrix according to the sampling data X

[0049] Taking the L space-time snapshot vectors x(p) in the sampling data X as samples, the sampling covariance matrix is ​​estimated by using the maximum likelihood estimation method which is:

[0050] R ...

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Abstract

The invention provides a sum and difference beam forming method based on a space-time adaptive processing radar and mainly aims at solving the problem of main lobe response distortion in the prior art. The method comprises the steps of firstly, inputting sampled data of a space-time adaptive processing radar in a signal processor; secondly, acquiring a sample covariance matrix through estimation based on the sampled data; thirdly, designing the angles and Dopplers of five constraint points; fourthly, designing sum beam weight vectors according to the sample covariance matrix and the five constraint points; fifthly, designing space domain difference beam weight vectors according to the sample covariance matrix and the five constraint points; sixthly, designing time domain difference beam weight vectors according to the sample covariance matrix and the five constraint points; seventhly, acquiring output signals of sum beams, space domain difference beams and time domain difference beams according to the sampled data and the beam weight vectors. Through amplitude-phase combined constraint, derivative constraint and multiple zero constraints, the method realizes sum and difference beam main lobe maintenance of a space-time adaptive processing radar and can be used for target tracking.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and further relates to a sum-difference beam forming method, which can be used for target tracking. Background technique [0002] Monopulse technology achieves high-precision real-time estimation of target angles by forming sum-difference beams, and is widely used in tracking radar systems. Traditional monopulse technology only uses analog methods to form sum and difference beams and process them, and uses the monopulse ratio, that is, the linear relationship between the ratio of the difference beam and the sum beam output signal and the angle, to achieve high-precision estimation of the target angle. Therefore, a good monopulse ratio is crucial for the estimation performance of the target angle. With the development of array radar and digital receiver technology, using digital methods to adaptively design sum difference beams, that is, adaptive monopulse technology has been rapidly de...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/66
CPCG01S7/41G01S13/66
Inventor 许京伟廖桂生王成浩张玉洪
Owner XIDIAN UNIV
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