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Interference subspace tracking-based high-efficiency self-adaptive monopulse angle measurement method

A technique for interfering with subspace and single-pulse angle measurement, which is applied in measuring devices, radio wave measurement systems, radio wave reflection/re-radiation, etc., and can solve problems such as large amount of computation and slow convergence speed

Inactive Publication Date: 2014-11-26
HOHAI UNIV
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an efficient adaptive monopulse angle measurement method based on interference subspace tracking, aiming at the huge amount of computation and independent The number of training samples with the same distribution solves the problems of large amount of calculation and slow convergence speed of the traditional adaptive single-pulse angle measurement method in the case of small samples

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  • Interference subspace tracking-based high-efficiency self-adaptive monopulse angle measurement method
  • Interference subspace tracking-based high-efficiency self-adaptive monopulse angle measurement method
  • Interference subspace tracking-based high-efficiency self-adaptive monopulse angle measurement method

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[0065] 1) Estimation of interference subspace based on MPASTd

[0066] Assuming that the uniform linear array is composed of N array elements, and the antennas of each array element are isotropic, the signal model of its detection unit can be expressed as follows:

[0067] z = a u b+n (1) In the formula, z represents the output signal of the detection unit array, b represents the complex envelope of the target, u represents the direction parameter and u=sinθ, θ is the azimuth angle of the target, Superscript T Represents the transposed symbol, λ is the wavelength of the transmitted signal, d is the distance between array elements, and n represents interference plus noise. Assume that the interference plus noise obeys a Gaussian distribution with a mean value of 0 and a covariance of Q, and the interference, noise and target are not correlated with each other.

[0068] The MPASTd algorithm is improved on the basis of PASTd. For radar application scenarios, first use the sa...

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Abstract

The invention discloses an interference subspace tracking-based high-efficiency self-adaptive monopulse angle measurement method. According to the invention, for the massive computation and the independent and identically distributed training sample number for covariance matrix estimation of the self-adaptive monopulse technology in the high-dimensional system, the MPASTd method is applied to the self-adaptive monopulse to carry out recursive estimation of the interference subspace; a new self-adaptive sum and difference beam weight is calculated; and a signal source space angle is obtained by using an angle estimation formula. With the method, the computation load is obviously reduced and the convergence speed is accelerated; and the good angle measurement precision is realized under the circumstances of small samples.

Description

technical field [0001] The invention belongs to the field of self-adaptive monopulse angle measurement, in particular to an efficient self-adaptive monopulse angle measurement method based on interference subspace tracking. Background technique [0002] Monopulse angle measurement technology was originally created for high-precision radar tracking. It obtains target angle information by comparing two simultaneous beam signals, but when there is interference, especially when the interference is close to the target, it will produce a large Angle estimate error. The adaptive monopulse tracking system can generate beams according to the target pointing, and at the same time adaptively eliminate the external interference, so it becomes an effective method for target angle estimation. Davis, Brennan and Reed first proposed the application of monopulse technology to adaptive array signal processing, and derived three adaptive monopulse formulas for equidistant linear arrays based ...

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Application Information

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IPC IPC(8): G01S13/68G01S7/02
CPCG01S13/68G01S7/295
Inventor 沈明威于佳杨柳王杰
Owner HOHAI UNIV
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