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Noise suppression Capon active target DOA estimation method based on time reversal

A time inversion and noise suppression technology, applied in the field of signal processing, can solve the problems of high side lobes, low resolution and accuracy, and achieve the effects of strong flexibility, improved estimation resolution and reduced accuracy

Active Publication Date: 2019-05-10
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, there are still many technical bottlenecks in the suppression method for unknown noise, even noise with secondary deformation.
It is precisely because of the existence of this noise that in the DOA spectrum obtained by the existing method, the side lobe is high, and the resolution and accuracy are low

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  • Noise suppression Capon active target DOA estimation method based on time reversal
  • Noise suppression Capon active target DOA estimation method based on time reversal
  • Noise suppression Capon active target DOA estimation method based on time reversal

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[0051] The present invention will be further described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be considered as limiting the scope of the present invention. As far as people are concerned, it is possible to obtain other related drawings based on these drawings without paying creative work.

[0052] DOA estimation system model such as figure 1 As shown in , the propagation space of the transmitted signal of the active target is a multipath and strong noise environment. Due to the existence of multipath, the signal received by the antenna array is the superposition of the attenuation and delay of the original transmitted signal. Assume that K active targets transmit uncorrelated narrow-band signals, and the direction of these signals is where θ (k,m,n) Indicates that the kth narrowband signal reaches the nth antenna unit...

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Abstract

The invention provides a noise suppression Capon active target DOA estimation method based on time reversal, which is different from most passive target DOA estimation. The method includes steps: an active target signal is received by employing a passive antenna array, namely the antenna array does not actively emit a signal detection space target but passively receives a signal emitted by an active target; when the antenna array receives the signal emitted by the active target, the signal is converted to receiving wave matrix forms for different channels, then time reversal and value back-transmission are performed, and a neural fuzzy reasoning system is adapted for noise suppression; and the noise suppression Capon active target DOA estimation method based on a TR is proposed, a space-time matching focusing characteristic of the TR and a specific direction optimization characteristic of a Capon algorithm are combined, and the estimation precision of a DOA is further improved. According to the method, multipath regarded as clutters is fully adopted, adequate receiving wave useful information is provided, and a result shows that an active target DOA spectrum obtained by employing the method has low sidelobe, high resolution and high precision, and the lower limits of the RMSE and the CRLB are lower.

Description

technical field [0001] The present invention relates to the field of signal processing, in particular to a method for estimating DOA of a noise-suppressed Capon active target based on time inversion. Background technique [0002] Estimation of target DOA has been widely studied in the fields of wireless communication and positioning, and is a key technology of array signal processing. Especially for the positioning of targets that cannot be observed with naked eyes or within the non-line-of-sight range, DOA estimation plays a vital role. However, with the increase of electronic equipment and the increasingly complex space environment, how to achieve the target in a strong noise environment, especially for active targets, the accurate estimation of DOA has become a technical problem. [0003] Most of the existing methods are aimed at the DOA estimation of passive targets, that is, the detection pulse is transmitted by the transceiver antenna array, and the pulse is reflected...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14
Inventor 李冰刘仕奇赵德双黄颖坤吴昀璞
Owner SOUTHWEST JIAOTONG UNIV
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