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Polarized filtering method based on inclined projection without needs of interference polarization parameter

A technology of polarization filtering and polarization parameters, applied in the field of signal processing, can solve the problems of small amount of calculation, influence of target signal, large amount of calculation, etc., and achieve the effect of small amount of calculation and convenient separation

Active Publication Date: 2009-03-18
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

[0006] The invention provides a polarization filtering method based on oblique projection, which can suppress the interference without estimating the polarization state of the interference without affecting the amplitude and phase of the target signal, is simple, has a small amount of calculation and is easy to implement , to solve the technical problems existing in the prior art that while suppressing interference, it also affects the target signal or the system has a high degree of complexity and a large amount of calculation

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  • Polarized filtering method based on inclined projection without needs of interference polarization parameter
  • Polarized filtering method based on inclined projection without needs of interference polarization parameter
  • Polarized filtering method based on inclined projection without needs of interference polarization parameter

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specific Embodiment approach

[0055] If the present invention is described by an elliptical coordinate system, this polarization state is expressed as the ellipticity angle and azimuth angle of polarization, and the specific implementation mode under the condition of the elliptic coordinate system is:

[0056] The first step: determine the ellipticity angle and azimuth angle of the target signal;

[0057] The second step: Estimate the power of the noise, that is, estimate the variance σ of Gaussian white noise 2 ; Set the received signal as y(t), target signal and interference as s(t), i(t) respectively, and n as additive Gaussian white noise, thus calculate the pseudo-inverse of the correlation matrix of target plus interference

[0058] R=E{y(t)y H (t)}=E{(s(t)+i(t)+n)(s(t)+i(t)+n) H}

[0059] =E{(x(t)+n)(x(t)+n) H}=E{x(t)x H (t)}+E{nn H}

[0060] =R xx +σ 2 I

[0061] R xx + = ( R ...

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Abstract

The invention relates to a polarization filtering method which is based on oblique projection and does not need to disturb polarization parameters, wherein the method comprises: determining the polarization parameters of a target signal, estimating the noise power, building a polaron space of the target signal by the polarization parameters of the target signal, calculating an oblique projector and a filter operator which are corresponding to the polaron space of the target signal and the noise power, accurately distilling the target signal by the filter operator, and filtering an interference signal. The polarization filtering method can carry out polarization filtering under the conditions of a cartesian coordinate system and an elliptic coordinate system, and can accurately distill the target signal.

Description

technical field [0001] The invention relates to a signal processing technology, in particular 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 polarization filtering technology, or the interfe...

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Application Information

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IPC IPC(8): H03H17/02
Inventor 张钦宇曹斌
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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