Radio wave arrival direction estimation method under condition of no direct signal

A technology of radio wave and direction estimation, applied in the field of signal processing, to achieve the effect of high robustness

Active Publication Date: 2019-10-11
DALIAN UNIV OF TECH +1
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  • Application Information

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Problems solved by technology

[0006] In order to overcome the deficiencies in multipath, occlusion and impulse noise suppression in the existing method for direction of arrival

Method used

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  • Radio wave arrival direction estimation method under condition of no direct signal
  • Radio wave arrival direction estimation method under condition of no direct signal
  • Radio wave arrival direction estimation method under condition of no direct signal

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Embodiment Construction

[0014] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0015] A method for estimating the direction of arrival of radio waves under the condition of no direct signal, the steps are as follows:

[0016] The first step is to establish a distributed source signal model.

[0017] figure 1 Among M array elements of an equidistant linear array, the distance between adjacent array elements satisfies the "half wavelength" condition d≤λ / 2, where the wavelength λ=2πc / ω, c is the propagation speed of light, and ω is the center of the signal frequency; when L mutually uncorrelated distributed signals are incident on the equidistant linear array, the mathematical model of the received signal is expressed as:

[0018]

[0019] Among them, s i (θ,ψ i ) is the diffusion signal density of the i-th distributed source, θ∈[-π / 2, π / 2] is the angle direction; ψ i is the para...

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Abstract

The invention belongs to the technical field of signal processing, and relates to a radio wave arrival direction estimation method under the condition of no direct signal, and especially can be used for estimating the wave arrival direction of a target under the coexistence of multipath, shielding and impulse noise interference in a radio propagation process with high precision. On the basis of asubspace theory, a distributed information source model is established based on a DSPE algorithm of generalized self-correlation entropy, the generalized self-correlation entropy is defined and expanded to the DSPE algorithm, for calculating a covariance matrix of the generalized correlation entropy of a linear array antenna receiving signal; and a two-dimensional spatial spectrum is built throughsingular value decomposition, and the direction of wave arrival of the distributed information source is estimated through spectral peak searching. The method disclosed by the invention has high robustness and is also suitable for gaussian noise.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and relates to a method for estimating the direction of arrival of radio waves under the condition of no direct signal, especially capable of estimating the wave of the target under the coexistence of multipath, occlusion and pulse noise interference in the radio propagation process with high precision. direction. Background technique [0002] In the field of array signal processing such as sonar, wireless communication and radar, DOA estimation, as an important technology of passive radio positioning, has been widely used. The basic principle of DOA estimation is: for a far-field signal source to be located, when the signal arrives at different array elements of the receiving array, a wave path difference will be generated, and this wave path difference will cause a gap between the signals received by each array element. The phase difference can be used to obtain the direction of arri...

Claims

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Application Information

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IPC IPC(8): G01S3/14G01S3/10
CPCG01S3/10G01S3/143
Inventor 邱天爽田全朝乐蒙李景春段洪涛李蓉范振雄
Owner DALIAN UNIV OF TECH
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