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Multipath using coherent beam forming method based on oblique projection

A technology of oblique projection and oblique projection operator, which is applied in the field of radar, can solve the problems of low output signal-to-noise ratio and performance degradation, and achieve the effect of improving signal-to-noise ratio

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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  • Multipath using coherent beam forming method based on oblique projection
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Embodiment Construction

[0034] Embodiments and effects of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0035] 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.

[0036] The geometric relationship of each parameter is:

[0037]

[0038]

[0039]

[0040]

[0041]

[0042] ΔR=R r -R t ≈2H r sin θ.

[0043] refer to figure 2 , the spe...

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Abstract

The invention discloses a multipath using coherent beam forming method based on oblique projection. In the prior art, multipath coherent signals can not be effectively received in a multipath environment. In the invention, the above problem is solved. The method is characterized by according to echo data, acquiring orthogonal projection matrixes of a direct wave guide vector and a reflected wave guide vector; obtaining a corresponding oblique projection operator according to the orthogonal projection matrixes of the direct wave guide vector and the reflected wave guide vector; calculating direct wave and reflected wave signals after the oblique projection according to the two obtained oblique projection operators; and carrying out beam forming on the direct wave and reflected wave signalsafter the oblique projection and combining results to obtain a total output signal. Because an echo signal is obliquely projected to the directions of the direct wave and the reflected wave, and beamforming results of the direct wave signal and the reflected wave signal are combined, multipath information is effectively utilized, and the signal to noise ratio of the echo signal is improved. And the method can be used for efficient 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 a 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 multipath...

Claims

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Application Information

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IPC IPC(8): G01S7/41G01S7/02
CPCY02A90/10
Inventor 张娟王凯吉郭玉梅张林让
Owner XIDIAN UNIV
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