Adaptive coherent beamforming method based on multipath information

An adaptive, beam-based technology, applied in the radar field, can solve problems such as low output signal-to-noise ratio and performance degradation, and achieve the effect of improving signal-to-noise ratio

Active Publication Date: 2019-04-16
XIDIAN UNIV
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Problems solved by technology

The joint reception of multipath signals is achieved by imposing the worst performance constraint on the desired signal and multipath interference, and it has good robustness, but the algorithm needs to estimate the direction of multipath interference, and there is a problem when the input signal-to-noise ratio The problem of performance degradation and low output signal-to-noise ratio when increasing

Method used

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  • Adaptive coherent beamforming method based on multipath information
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Embodiment Construction

[0035] Embodiments and effects of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0036] refer to figure 1 , the usage scenario of the present invention, assuming that the target height is H t , the elevation angle is θ, the oblique distance between the target and the antenna is R, and the incident angle of the target direct wave is θ 1 , the incident angle of reflected wave is θ 2 . Suppose R>>H t , that is, the target distance is far greater than the target height, then there is θ 1 ≈θ 2 . The direct and reflected wavepaths of the target and the antenna are R t and R r .

[0037] The geometric relationship of each parameter is:

[0038]

[0039]

[0040]

[0041]

[0042] ΔR=R r -R t ≈2H r sin θ.

[0043] refer to figure 2 , the specific implementation steps of the present invention are as follows:

[0044] Step 1: Establish an array radar signal model and obtain radar echo data. ...

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Abstract

The invention discloses an adaptive coherent beamforming method based on multipath information, which mainly solves the problem that multipath coherent signals can not be effectively received in a low-altitude multipath environment in the prior art. The method comprises steps: 1, in a narrow-band multipath environment, a radar generates transmitting signals, and array radar echo data are obtained;2, according to the echo data, an array covariance matrix is calculated; 3, the array covariance matrix is subjected to characteristic decomposition to obtain signal subspace and noise subspace; 4, based on the orthogonality of the signal subspace and the noise subspace, a multipath reflection coefficient is estimated; 5, the multipath reflection coefficient is compensated to obtain the optimal weighting vector; and 6, according to the optimal weighting vector, adaptive beamforming is obtained. In the method, adaptive beamforming is carried out through compensating the reflection coefficientto obtain the optimal weighting vector, multipath coherent information is used effectively, the signal-to-noise ratio of the echo signals is improved, and the method can be used to effectively receivethe multipath coherent signals in a multipath environment.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to an adaptive beam forming method, which can be used for effectively receiving multipath coherent signals in a multipath environment. Background technique [0002] When the radar is performing low-altitude detection, the echo signal not only includes the direct wave signal, but also includes the multipath wave signal. Under the influence of the multipath effect, the direct wave and the multipath wave are mutually coherent source signals, and the multipath coherent interference will cancel the desired signal, resulting in a sharp decline in the signal-to-noise ratio. The effect seriously affects the detection performance of low-elevation-angle targets. In order to solve this problem, the multipath interference beamforming algorithm has been widely studied. At present, according to the different processing methods for multipath interference, it can be divided into multipat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02
CPCG01S7/023Y02D30/70
Inventor 张娟王凯吉郭玉梅张林让
Owner XIDIAN UNIV
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