Shallow sea target direction-of-arrival estimation method based on active time reversal

A direction estimation, target wave technology, applied in the direction or offset system, the direction finder using ultrasonic/sonic/infrasonic waves, etc., to achieve the effect of strong ability to suppress side lobes, improve signal-to-noise ratio, and high precision

Active Publication Date: 2018-01-09
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0004] At present, there are many studies on detection, communication and positioning using time-inverse methods, and relatively few studies on DOA estimation

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  • Shallow sea target direction-of-arrival estimation method based on active time reversal
  • Shallow sea target direction-of-arrival estimation method based on active time reversal
  • Shallow sea target direction-of-arrival estimation method based on active time reversal

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0026] The present invention applies the active time-reversal technology to shallow sea target DOA estimation, fully considers the channel factor in the model, and establishes a model based on the uniform line array (uniform line array, ULA) active time inverse multipath DOA estimation model, the theoretical derivation is carried out using a narrow-band single-frequency rectangular pulse (Continuous Wave, CW) signal, and the estimation algorithm is implemented using the Capon algorithm. Simulation results show that under the same SNR condition, the proposed active time-inverse DOA method can obtain better estimation results than conventional methods, especially in low SNR conditions.

[0027] Specific steps are as follows:

[0028] The first step: the uniform line array is...

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Abstract

The invention provides a shallow sea target direction-of-arrival estimation method based on active time reversal and relates to the fields of shallow water acoustic channel, active time reversal and array signal processing. The method is characterized in that the target receives a signal and carries out reflection; each array element of a uniform linear array receives the reflected signal, and thesignal received by the array element is popularized to each array element; the received signal of each array element is subjected to filtering, and then, is subjected to time reversal processing; theuniform linear array receives the signal for the second time; after time reversal, a sample covariance matrix of array output signals is obtained; a spatial spectrum function is obtained through a Capon algorithm; and spectrum peak search is carried out on the spatial spectrum function to estimate the direction of arrival of the target. The method carries out target DOA estimation based on the active time reversal, so that the method is higher in estimation precision, better in sidelobe suppression capability and can be better applied to DOA estimation under low signal-to-noise ratio and multipath conditions.

Description

technical field [0001] The invention relates to the field of shallow sea acoustic channel, active time feedback, and array signal processing, in particular to a method for estimating direction of arrival of shallow sea targets based on active time reflection. Background technique [0002] An unavoidable factor in signal processing in shallow sea environment is the multipath effect of the channel. Conventional processing methods are based on direct waves, ignoring multipath or trying to eliminate the impact of multipath, which regards multipath as an unfavorable factor; on the basis of direct waves, various wave Direction of arrival (DOA) estimation methods, but most of these methods are based on high signal-to-noise ratio conditions, and the algorithm fails when the signal-to-noise ratio is low. [0003] Time reversal (time reversal, referred to as TR or time reversal) method, due to the use of the reciprocity of the ocean acoustic field, can make full use of the multipath ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/802
Inventor 王海燕荆海霞申晓红刘郑国张之琛贾天一刘镭马石磊
Owner NORTHWESTERN POLYTECHNICAL UNIV
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