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Signal subspace weighted super-resolution direction-of-arrival detection method and system

A technology of signal subspace and direction of arrival, applied in the field of signal processing, can solve the problem of difficult separation of sensor arrays and achieve the effect of suppressing target interference

Active Publication Date: 2021-02-12
XIDIAN UNIV
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Problems solved by technology

[0004] In order to solve the deficiencies in the prior art, the present invention provides a signal subspace weighted super-resolution DOA detection method and detection system to solve the problem that the sensor array is difficult to distinguish when multiple target signals are approaching

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  • Signal subspace weighted super-resolution direction-of-arrival detection method and system

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Embodiment Construction

[0048]Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations done on the basis of the technical solutions of the present application all fall within the protection scope of the present invention.

[0049] In a specific embodiment of the present invention, it is assumed that there are P signal sources in the target space, and the direction angle information of the P signal sources is Θ=[θ 1 ,θ 2 ,...,θ p ,...θ P ], where θ p Indicates the direction angle of the pth signal source, P≥1. The purpose of the present invention is to calculate the angle information of these signal sources.

[0050] Step 1, deploy the signal receiving sensor array:

[0051] For the above target space, a signal receiving sensor array is arranged. The sensor array of the present invention is made up of M array element (being sensor), as figure 1 shown. M≥P...

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Abstract

The invention discloses a signal subspace weighted super-resolution direction-of-arrival detection method and system. The method comprises the following steps: deploying a signal receiving sensor array; receiving signal data of a signal source of a target space according to a preset sampling moment to form a signal data matrix; carrying out eigenvalue decomposition on the signal data matrix to obtain a signal subspace and a noise subspace; constructing a spatial spectrum function based on orthogonal characteristics between the signal subspace and the noise subspace; solving an extreme value point of the spatial spectrum function, wherein the extreme value point is a direction angle of a target source; correcting the spatial spectrum function according to the solved direction angles of allthe target sources; solving the extreme value point of the corrected spatial spectrum function, wherein the extreme value point is a direction angle of a second target source; and repeating the process till that the direction angles of all the target sources are obtained. Through the distributed target detection method, the signal sources in the target space are identified one by one, and the problem that a plurality of similar targets are difficult to distinguish in a traditional method is solved.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and relates to a direction-of-arrival detection method and a detection system for signal subspace weighted super-resolution. Background technique [0002] Direction Of Arrival (DOA) estimation is an important research branch in the field of signal processing, and is widely used in radar, sonar, communication and seismic detection and other fields. The main purpose of DOA estimation is to distinguish two target signals that are very close in direction in a noisy environment. In DOA estimation, the estimation accuracy of the target signal is an important technical indicator. With the continuous strengthening of application scenarios, the requirements for this indicator are getting higher and higher. [0003] In the existing technology, commonly used high-resolution subspace algorithms, such as the MUSIC algorithm. The method of DOA estimation by MUSIC is: by separating the noise subspac...

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Application Information

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IPC IPC(8): G01S3/14G01S3/04G01S3/48
CPCG01S3/143G01S3/043G01S3/48
Inventor 徐楷杰全英汇邢孟道聂卫科鄂韩宇
Owner XIDIAN UNIV