Radar signal motion disturbance spatial-polarizational domain combined stable filtering method

A motion interference and radar signal technology, applied to radio wave measurement systems, instruments, etc., can solve the problems of not using array polarization information, low calculation amount, and high computational complexity, and achieve the effect of real-time and effective suppression of motion interference

Active Publication Date: 2014-04-16
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages in the prior art that the calculation complexity is very large or the array polarization in

Method used

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  • Radar signal motion disturbance spatial-polarizational domain combined stable filtering method
  • Radar signal motion disturbance spatial-polarizational domain combined stable filtering method
  • Radar signal motion disturbance spatial-polarizational domain combined stable filtering method

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Embodiment 1

[0049] The present invention is a space-polarization domain joint robust filtering method for radar signal motion interference, referring to figure 1 , the specific implementation steps of the present invention include as follows:

[0050] Step 1: The radar antenna array receives data X(t). For a half-wavelength equidistant antenna array composed of N orthogonal dipoles, see figure 2 , in this example the antennas are arranged equidistantly in the form of orthogonal dipoles, the total number of dipoles is N, and the distance between adjacent dipoles is d, represent the azimuth and elevation angles respectively, assuming that there is a target from direction, while there are a total of P disturbances from The direction is incident on the array, and the array receives the signal at time t, and the received data under a snapshot is expressed as:

[0051] X ( t ) = N ...

Embodiment 2

[0074] The radar signal motion interference airspace-polarization domain joint robust filtering method is the same as that in Embodiment 1

[0075] In step 2, for the first M snapshot data of the received data X(t), use the PASTd algorithm to obtain the interference signal subspace at time t=i (i=1,2,...,M)

[0076] (1) Initialize d p (0) and u p (0)(p=1,2,...,P), i=0;

[0077] (2) i=i+1,x 1 (i)=X h (i);

[0078] (3) Calculate u in turn when p takes (1,2,...P) p (i):

[0079] y p ( i ) = u p H ( i - 1 ) x 1 ( i )

[0080] d p (i)=βd p (i-1)+|y p (i)| 2 , β is the forgetting factor

[0081] e p (i)=x p (i)-u p (i-1)y p (i), e p (i) is the estimation error

[0...

Embodiment 3

[0089] The joint robust filtering method of radar signal motion interference airspace-polarization domain is the same as that of Embodiment 1-2

[0090] In step 3, the orientation estimate (θ 1 (t), θ 2 (t),...,θ P (t)), where the polarization vector of a fast-moving interference is expressed as The power series expansion of the perturbation with the spatial domain polarization state model and the first-order approximation are obtained to obtain the spatial domain polarization state model a n (n=0,1) is the first-order coefficient of the real part power series expansion of the polarization space state disturbance, b n (n=0,1) is the first-order coefficient of the power series expansion of the imaginary part of the state disturbance in the polarization space domain. In order to facilitate the solution, a mathematical transformation will be performed to solve the polarization ratio vector P J Transformed into the easy-to-calculate polarization parameter vector Ρ=[1 (b 0 ...

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Abstract

The invention discloses a radar signal motion disturbance spatial-polarizational domain combined stable filtering method. The method comprises, firstly, performing real-time estimation of disturbance signal subspace on the horizontal channel data of a polarized sensitive array through a PASTd (projection approximation subspace tracking with deflation) algorithm and meanwhile estimating the azimuth angles of disturbance signals through an MUSIC (multiple signal classification) algorithm; then estimating disturbance spatial-polarizational models through the estimated disturbance signal azimuth angles, and after obtaining the disturbance spatial-polarizational models, performing spatial domain orthogonal projection filtering through the disturbance subspace obtained during the disturbance angle real-time estimation process; lastly, performing oblique projection polarization filtering. The radar signal motion disturbance spatial-polarizational domain combined stable filtering method is simple and practical, can accurately estimate the disturbance signal directions and timely achieve spatial-polarizational domain combined disturbance suppression through spatial-polarizational characteristic models and accordingly can be applied to suppression of motion disturbance in the fields of radars, communication and the like.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and mainly relates to array robust beam forming, in particular to an airspace-polarization domain joint robust filtering method for radar signal motion interference. It can be applied to interference suppression in the case of relative motion between the radar platform and the interference. Background technique [0002] The adaptive beamforming technology of radar is the basis and core of array signal processing. However, in a non-stationary environment such as rapid changes in the interference position or the movement of the antenna platform, the update speed of the adaptive weights is relatively slow, which leads to weight training. There is a mismatch between the data of the weight and the data of the weight application. The interference is likely to move out of the interference null position and cannot be effectively canceled. In severe cases, the adaptive processing algorithm...

Claims

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Application Information

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IPC IPC(8): G01S7/36
CPCG01S7/021G01S7/36
Inventor 廖桂生杨志伟纪文静田静曾操张蕊
Owner XIDIAN UNIV
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