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Airborne three-dimensional heterogeneous array clutter and interference suppression method based on blind source separation

A technology of blind source separation and interference suppression, applied in the field of signal processing

Pending Publication Date: 2021-09-10
XIDIAN UNIV
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Problems solved by technology

[0004] Aiming at the problem that the existing technology cannot be applied to the clutter suppression and interference suppression of the three-dimensional heterogeneous array, the purpose of the present invention is to provide an airborne three-dimensional heterogeneous array clutter and interference suppression method based on blind source separation. Based on the different amplitude distribution characteristics of clutter, interference and targets, combined with the multi-channel nature of the array, an airborne three-dimensional heterogeneous array clutter and interference suppression method based on blind source separation is proposed, which can effectively suppress clutter and interference

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  • Airborne three-dimensional heterogeneous array clutter and interference suppression method based on blind source separation
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  • Airborne three-dimensional heterogeneous array clutter and interference suppression method based on blind source separation

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Embodiment Construction

[0050] Embodiments of the present invention will be described in detail below in conjunction with examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention.

[0051] refer to Figure 1-2 A kind of airborne three-dimensional heterogeneous array clutter and interference suppression method based on blind source separation provided by the present invention comprises the following steps:

[0052] Step 1, assuming that there are target echo s(t), clutter c(t) and interference j(t) in the space, and they enter the elements of the airborne three-dimensional heterogeneous array at the same time, assuming that the target signal is far-field narrowband signal, the received signal form is:

[0053] X=AS+N

[0054] In the formula, X=[x 1 ,x 2 ,...,x M ] T is the signal vector of M dimension, A is the random mixing matrix of M×N dimensio...

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Abstract

The invention belongs to the technical field of signal processing, and discloses an airborne three-dimensional heterogeneous array clutter and interference suppression method based on blind source separation. The method comprises the following steps: setting that a target echo s(t), a clutter c(t) and interference j(t) exist in a space and enter array elements of an airborne three-dimensional heterogeneous array at the same time, setting a target signal as a far-field narrow-band signal, and setting a received signal as X; solving a correlation matrix R according to the received signal X, and carrying out eigenvalue decomposition R = U[lambda]U<H> on the correlation matrix R; solving a whitening matrix W according to the matrix U obtained through characteristic decomposition; performing whitening preprocessing on the received signal X by adopting the whitening matrix W to obtain observation data z after whitening preprocessing; solving a fourth-order cumulant matrix Q (T) and an estimation matrix V; and obtaining a blind source separation result according to the estimation matrix V, and expressing the effect of the algorithm by using a similarity coefficient. By analyzing different amplitude distribution characteristics of clutters, interference and targets and combining the multi-channel performance of the array, the clutter and interference suppression method of the airborne three-dimensional heterogeneous array based on blind source separation is provided, and clutters and interference can be effectively suppressed.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to an airborne three-dimensional heterogeneous array clutter and interference suppression method based on blind source separation. Background technique [0002] The airborne three-dimensional heterogeneous array is a three-dimensional complex array composed of multiple different curved surface arrays. The large effective launch aperture can meet the needs of radar for target detection in complex battlefield environments. Compared with the traditional two-dimensional planar array, the three-dimensional heterogeneous array is a more generalized configuration, which can be regarded as a combination of multiple conformal arrays. Therefore, the clutter suppression method of the three-dimensional heterogeneous array can refer to the conventional clutter suppression method, but due to the nonlinearity of the airborne three-dimensional heterogeneous array antenna and the non-equa...

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Application Information

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IPC IPC(8): G01S7/41G01S7/36
CPCG01S7/414G01S7/418G01S7/36Y02A90/10
Inventor 梁毅何家正吴建新殷志文
Owner XIDIAN UNIV
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