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Polarized filtering method based on inclined projection

A technology of polarization filtering and oblique projection, which is applied in the direction of instruments, character and pattern recognition, computer components, etc., and can solve problems such as inability to complete polarization filtering

Inactive Publication Date: 2010-07-28
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In addition, under the condition that the polarization angle of the target signal and the interference are the same, the polarization angle is different, or the ellipticity angle is the same, and the azimuth angle is different, the existing polarization filtering (traditional polarization filtering and zero-phase shift polarization filtering) While suppressing interference, the target signal is also suppressed, and the purpose of polarization filtering cannot be achieved

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  • Polarized filtering method based on inclined projection
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  • Polarized filtering method based on inclined projection

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Embodiment approach 1

[0050] Embodiment 1: If the present invention is described by the Cartesian coordinate system, this polarization state is expressed as the difference between the polarization angle and the polarization angle, and the specific implementation mode under the condition of the Cartesian coordinate system is:

[0051] The first step: determine the polarization angle and polarization angle difference between the target signal and the interference;

[0052] The second step: according to the theoretical model of the oblique projection operator, the target signal polarization subspace S and the interference polarization subspace I are established according to the polarization parameters of the target signal and interference obtained in the first step, which are respectively:

[0053] S = [ cos ϵ s , sin ϵ s ...

Embodiment approach 2

[0068] Embodiment 2: If the present invention adopts the elliptic coordinate system to describe, this polarization state is expressed as the ellipticity angle and the azimuth angle of polarization, and the specific implementation mode under the elliptic coordinate system condition is:

[0069] Step 1: Determine the ellipticity angle and azimuth angle of the target signal and interference;

[0070] The second step: according to the theoretical model of the oblique projection operator, the target signal polarization subspace S and the interference polarization subspace I are established according to the polarization parameters of the target signal and interference obtained in the first step, which are respectively:

[0071]

[0072]

[0073] In the above formula τ s and τ i are the determined ellipticity angle of the target signal and the ellipticity angle of the interference, respectively, with are the determined target signal azimuth and interference azimuth, respec...

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Abstract

The invention relates to a polarization filtering method based on oblique projection, which belongs to the field of polarized signal processing and anti-jamming. When a target signal is not orthogonal with a jammed polarization state, the traditional polarization filtering has the influence on the extent and the phase position of the target signal and the influence on the extent and the phase position of the target signal can be eliminated by the zero phase shift polarization filtering by consummation and compensation. Furthermore, when the target signal is the same with a jammed polarizationangle and is different from the phase difference of the polarization angle or is the same with an ellipticity angle and is different from an azimuth angle, the existing polarization filter also restrains the target signal when carrying out restraining the jamming. The invention aims at solving the technical problems that the polarization filtering method is consummated and developed, the accuraterecovery of the target signal can be realized and the advantages of less calculation amount, simpleness and the practicality can be brought. The polarization filtering method mainly comprises four steps that: firstly, the target and the jammed polarization state are estimated; secondly, the target signal and the jammed polarization subspace are respectively established; thirdly, the filtering arithmetic operator of the invention can be calculated according to the built subspace; fourthly, the target signal is extracted. The invention realizes the compensation and the consummation of the existing polarization filtering method.

Description

technical field [0001] The invention relates to an algorithm implementation of polarization filtering, more specifically, the invention relates to a method for implementing polarization filtering by using oblique projection technology and polarization signal processing technology. Background technique [0002] As a complementary form of time domain signal processing, frequency domain signal processing and air domain signal processing, polarization domain signal processing technology has attracted more and more attention, and has been widely used in radar and communication systems. In anti-jamming technology, polarization anti-jamming is different from frequency-domain anti-jamming and space-domain anti-jamming. The limitation of factors such as interference frequency and spatial incident direction. As long as there is a difference in the polarization state of the interference and the target, even if the other characteristics of the two are the same, they can be separated by...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
Inventor 毛兴鹏张钦宇
Owner HARBIN INST OF TECH AT WEIHAI