Separated polarization sensitive array coherent signal DOA and polarization parameter estimation method based on BSBL-EM algorithm

A BSBL-EM, polarization-sensitive array technology, applied in the field of phased array radar, can solve the problems of low signal-to-noise ratio polarization-sensitive arrays, etc., and achieve the effects of reduced algorithm complexity, easy engineering implementation, and small structural mutual coupling

Pending Publication Date: 2021-03-16
AIR FORCE EARLY WARNING ACADEMY
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Problems solved by technology

[0006] The purpose of the present invention is to use block sparse Bayesian learning to solve the problem of polarization-sensitive array parameter estimation under low signal-to-noise ratio and low snapshot conditions

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  • Separated polarization sensitive array coherent signal DOA and polarization parameter estimation method based on BSBL-EM algorithm
  • Separated polarization sensitive array coherent signal DOA and polarization parameter estimation method based on BSBL-EM algorithm
  • Separated polarization sensitive array coherent signal DOA and polarization parameter estimation method based on BSBL-EM algorithm

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[0017] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. Assuming that there are K coherent targets in the air, the array is a uniform linear array composed of M separate electromagnetic vector sensors, and a single separate electromagnetic vector sensor is composed of 3 electric dipoles and 3 magnetic rings, and its steering vector is

[0018]

[0019] Among them, ⊙ represents the Hadamard product, Δ xy Indicates the distance between the electric dipole placed in the x-axis direction and the electric dipole placed in the y-axis direction, and the distance between the magnetic ring parallel to the zoy plane and the magnetic ring parallel to the xoz plane is also Δ xy , similarly, Δ xy Also represents the spacing of the corresponding electric dipoles and magnetic loops. Then the array receives data as

[0020]

[0021] in, Denotes the airspace-polarization joint steering vector, q k Indicate...

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Abstract

The invention discloses a separated polarization sensitive array coherent signal DOA and polarization parameter estimation method based on a BSBL-EM algorithm. The method comprises the following steps: firstly, constructing a parameter-free'mutual coupling 'signal model so as to reduce the computation complexity; secondly, deriving vectorized block sparse representation under a multi-snapshot condition, so that a complete dictionary only contains DOA parameters, and a block sparse signal vector contains polarization parameters and original signals; recovering a block sparse signal vector by using a block sparse Bayesian learning algorithm; and finally, calculating estimated values of DOA and polarization parameters according to the support set of the non-zero elements and the intra-block correlation. Compared with a traditional subspace algorithm, the method provided by the invention can realize coherent target angle estimation without space smoothing or polarization smoothing; in addition, the array structure is suitable for a conformal phased array radar, and the separated array element structure is convenient for engineering realization.

Description

technical field [0001] The present invention relates to separate polarization-sensitive array coherent signal DOA and polarization parameter estimation based on BSBL-EM algorithm, and is especially suitable for phased-array radars with limited space for array arrangement and conformal shape. Background technique [0002] At present, most radar equipment uses the sum-difference method to measure the direction of arrival (Direction of Arrival) of the target. This method has high precision and can meet the real-time requirements. The biggest disadvantage of the sum-difference method is that it can only measure the angle of a single target in the main beam. When there are two targets or even multiple targets in the main beam, the sum-difference method will fail. Therefore, radar technicians continue to explore new institutional radars and new signal processing methods. [0003] Compared with the scalar array, the polarization-sensitive array can additionally perceive the polari...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88
CPCG01S13/88
Inventor 李槟槟陈辉杜庆磊刘维建张昭建周必雷
Owner AIR FORCE EARLY WARNING ACADEMY
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