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MIMO radar super-resolution direction finding algorithm of coherent signal sources under color noise background

A color noise and super-resolution technology, applied in the field of MIMO radar super-resolution direction finding algorithm, can solve the problems of not considering the influence of color noise, loss of differential covariance matrix, and inability to distinguish coherent sources, etc. The effect of excellent performance and strong color noise suppression ability

Inactive Publication Date: 2017-07-14
XIDIAN UNIV
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Problems solved by technology

There are related literature [Wen C and Wang T.Reduced-dimensional unitary ESPRIT algorithm for monostatic MIMO radar[J].Systems Engineering and Electronics,2014,36(6):1062–1067; Zheng G M,Chen B X,and YangM L .Unitary ESPRIT algorithm for bistatic MIMO radar[J].Electronics Letters,2012,48(3):179–181] uses the method of differential operation to deal with color noise, but cannot distinguish the coherent source
The literature [Ye Zhongfu. Spatial smoothing difference method [J]. Communication Journal, 1997,18(9):1-7] adopts forward-backward spatial smoothing difference (FBSSD) algorithm, which can distinguish coherent sources but has low resolution. without considering the effect of color noise
The literature [Qi Chongying. Research on robustness of high-resolution DOA estimation [D]. Xi'an: Air Force Engineering University, 2005:74-79] also proposed a spatial difference smoothing (SDS) algorithm for coherent sources under the background of color noise , but the algorithm suffers from a rank deficit in the differential covariance matrix under certain circumstances

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  • MIMO radar super-resolution direction finding algorithm of coherent signal sources under color noise background

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[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0057] 1. Mixed source MIMO radar data model

[0058] consider as figure 1 The shown MIMO radar, in which the array antennas share the same transmission and reception, is an equidistant linear array of M array elements, and the array element spacing d=λ / 2, where λ is the carrier wavelength.

[0059] Suppose there are P targets in the far field of the radar, and both DOA and DOD are θ p . Then when the target is an ideal point target, the received echo signal can...

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Abstract

The invention relates to the field of MIMO radar (multiple-input multiple-output radar) super-resolution direction finding algorithm, discloses an MIMO radar super-resolution direction finding algorithm of coherent signal sources under the color noise background, and particularly provides an improved spatial difference smoothing (ISDS) algorithm. Besides, a fast algorithm based on a propagation operator, i.e. a PM-ISDS algorithm, is also provided based on the ISDS algorithm. Theoretical analysis and simulation prove that the algorithm has extremely high color noise suppression capacity, and the estimate performance is better than that of the common spatial smoothing algorithm so that the algorithm has great array element saving and signal source overload capacity without performing characteristic value decomposition and has low computational burden.

Description

technical field [0001] The invention relates to the field of MIMO radar super-resolution direction-finding algorithms, in particular to the MIMO radar super-resolution direction-finding algorithm for coherent sources under the background of colored noise. Background technique [0002] The current research on MIMO radar super-resolution direction finding generally assumes that the noise is Gaussian white noise, but in practical applications, for example, when there are scintillation caused by large reflectors or spike interference caused by waves in the echo, the noise is colored noise. In addition, due to the existence of low-altitude multipath effects, the target echoes received by MIMO radars are often coherent. In these cases, the performance of the most commonly used subspace class algorithms, such as ESPRIT, MUSIC, etc., will drop sharply. Therefore, super-resolution direction finding of colored noise backgrounds or coherent sources has received extensive attention. T...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/414
Inventor 宫健楼顺天郭艺夺张伟涛黄大荣肖宇郑桂妹
Owner XIDIAN UNIV
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