DOA and frequency combined estimation method based on structure least square method

A least square method and frequency estimation technology, applied in the field of joint angle of arrival-frequency estimation, can solve problems such as coherent signal failure

Inactive Publication Date: 2014-09-03
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of invalidation of coherent signals when the traditional ESPRIT algorithm jointly estimates DOA and frequency

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  • DOA and frequency combined estimation method based on structure least square method
  • DOA and frequency combined estimation method based on structure least square method
  • DOA and frequency combined estimation method based on structure least square method

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] Considering a uniform linear array with M omnidirectional array elements, the center frequency f of the bandwidth of the signal of interest is c . Suppose there are P(Pp (t)}, the center frequency is f c +f p , p=1,...,P, the direction is {θ 1 ,...,θ P}'s far-field signal acts on the uniform linear array. After down-conversion to baseband signal, the M×1 observation vectors are

[0041] x ( t ) = Σ i = 1 P a ( θ ...

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Abstract

The invention provides a DOA and frequency combined estimation method based on a structure least square method. The problem that DOA and frequency combined estimation with a traditional ESPRIT algorithm is disabled for coherent signals is solved. Different from a sampling covariance matrix used in the traditional ESPRIT algorithm, a front-and-back average covariance matrix is adopted in the DOA and frequency combined estimation method to replace the sampling covariance matrix, risks generated when the coherent signals are processed with the ESPRIT algorithm are avoided, and meanwhile the problem that the optimal time domain factor is difficult to obtain is solved. Errors of signal subspace are considered, then a rotation invariant equation is solved through an SLS, the signal subspace higher in accuracy is obtained, and robust estimation of the DOA and the frequency of signals is completed.

Description

technical field [0001] The invention relates to the technical field of array signal processing, in particular to a joint angle of arrival-frequency estimation method. Background technique [0002] Array signal processing is an important branch in the field of signal processing. After decades of development, it has become increasingly mature and has been widely used in many military and national economic fields such as radar, biomedicine, exploration and astronomy. Its working principle is to form a sensor array with multiple sensors, and use this array to receive and process space signals, with the purpose of suppressing interference and noise, and extracting useful information of signals. Different from general signal processing methods, array signal processing is to receive signals through sensor groups arranged in space, and use the spatial characteristics of signals to filter and extract information. Therefore, array signal processing is also often referred to as spatia...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 黄磊钱诚杨云川蒋双
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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