Multipath target DOA estimation method in complex electromagnetic environment

A complex electromagnetic and environmental technology, applied in radio wave direction/deviation determination systems, direction finders using radio waves, etc., can solve the problems of estimation accuracy and reliability decline, and achieve suppression of multipath interference, improvement of accuracy and robustness sticky effect

Pending Publication Date: 2022-01-28
TAIZHOU UNIV
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Problems solved by technology

[0005] Due to the serious decline in the estimation accuracy and reliability of the radio target source DOA caused by the multipath effect in the complex electromagnetic environment, the present invention models the multipath signal, constructs a spatially distributed source signal model, and overcomes the multipath effect to estimate the signal parameters. The influence of the influence, accurately realize the DOA estimation of the radio target source in the complex electromagnetic environment

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  • Multipath target DOA estimation method in complex electromagnetic environment
  • Multipath target DOA estimation method in complex electromagnetic environment
  • Multipath target DOA estimation method in complex electromagnetic environment

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Embodiment 1

[0054] This embodiment provides a multipath target DOA estimation method in a complex electromagnetic environment, the steps are as follows:

[0055] The first step is to establish a low-complexity distributed source signal model;

[0056] Specifically, such as figure 1 As shown, ULA stands for Uniform Linear Array, represents the central DOA, σ represents the diffusion angle, l 0 Indicates the multipath signal corresponding to the central DOA, l 1 and l 2Respectively represent the two multipath signals corresponding to the spread angle.

[0057] Assuming that K mutually independent distributed sources are incident on the uniform linear array ULA composed of M array elements, then the complex envelope of the signal observed on the i-th array element is expressed as

[0058]

[0059] Among them, a i (θ k ) is the steering vector of the kth target source on the i-th array element, s k (t) is the angular signal density of the kth target source, n i (t) is the additiv...

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Abstract

The invention discloses a multipath target DOA estimation method in a complex electromagnetic environment. The method comprises the steps of establishing a low-complexity distribution source signal model; through the low-complexity distribution source signal model, constructing a quadratic optimization problem based on a Lagrangian function; solving according to the quadratic optimization problem, and constructing a two-dimensional spatial spectrum comprising two parameters, namely, a center DOA and a spread angle; and performing spectrum peak search on the two-dimensional spatial spectrum to obtain joint estimation of a radio target source center DOA and a spread angle. According to the invention, multipath interference is effectively suppressed, joint estimation of the DOA and the spread angle is accurately and reliably realized, and the precision and robustness of the algorithm are improved.

Description

technical field [0001] The invention relates to the technical field of radio target monitoring and positioning, in particular to a multipath target direction of arrival (Direction of Arrival, DOA) estimation method in a complex electromagnetic environment. Background technique [0002] As an important technical means of passive radio target monitoring and positioning, radio parameter estimation has received extensive attention both in practical application and theoretical research since the 1960s. The DOA estimation problem is the core problem of radio parameter estimation. Accurate and effective DOA estimation is the basis of radio target monitoring and positioning. DOA estimation has been widely used in military fields such as radar and sonar and civilian fields such as wireless communication. As a milestone in DOA estimation from conventional resolution to super-resolution, Schmidt introduced subspace technology into the field of DOA estimation in 1979. The signal subspa...

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor田全蔡睿妍
OwnerTAIZHOU UNIV