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Adaptive coherent beam formation method of multi-path utilization

An adaptive, beam technology, applied in the field of radar, can solve the problems of low output signal-to-noise ratio and performance degradation, achieve the effect of improving the signal-to-noise ratio, wide application range, and solving multi-path coherent signal reception

Active Publication Date: 2019-06-18
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 beam formation method of multi-path utilization
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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 application scenario of the present invention includes two incoming wave paths of direct wave and reflected wave, wherein the target height is H t , the antenna height is H r , the elevation angle between the target and the horizontal plane is θ, the oblique distance between the target and the antenna is R, and the incident angle of the direct wave direction of the target is θ 1 , the incident angle of the reflected wave direction is θ 2 . The direct and reflected wavepaths of the target and the antenna are R t and R r , the wave path difference between the two is ΔR.

[0037] The geometric relationship of each parameter is:

[0038]

[0039]

[0040]

[0041]

[0042]

[0043] ΔR=R r -R t ≈2H r sin θ.

[0044] refer to figure 2 , based on the above scenario, the specific i...

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Abstract

The invention discloses an adaptive coherent beam formation method of multi-path utilization. In the prior art, multipath coherent signals can not be effectively received in a low-altitude multipath environment. By using the method of the invention, the above problem is solved. The method is characterized by 1, in a narrow-band multipath environment, generating an emission signal by a radar and obtaining array radar echo data; 2, calculating an array covariance matrix based on the echo data; 3, carrying out characteristic decomposition on the array covariance matrix to obtain a signal subspaceand a noise subspace; 4, estimating a multipath reflection coefficient according to orthogonality between the signal subspace and the noise subspace; 5, constraining the multipath reflection coefficient to obtain an optimal weighted vector; and 6, according to the optimal weighted vector, acquiring adaptive beam formation. In the invention, through constraining the reflection coefficient, the optimal weighted vector is acquired and adaptive beam formation is performed, multipath coherent information is effectively used, a signal-to-noise ratio of the echo signal is increased, and the method can be used for effective reception of the multipath coherent signals in the multipath environment.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to an adaptive coherent 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...

Claims

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Application Information

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IPC IPC(8): G01S7/41G01S7/02
Inventor 张娟郭玉梅王凯吉张林让
Owner XIDIAN UNIV
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