A method for estimating the direction of arrival of far-field narrowband signals based on numerical solution of directivity model

A narrow-band signal and numerical solution technology, which is applied in the field of signal processing, can solve problems such as the decrease in the accuracy of direction of arrival estimation, and achieve strong robustness and good estimation performance.

Active Publication Date: 2022-07-08
SOUTHEAST UNIV
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Problems solved by technology

However, for some directions of arrival, the main lobe of the angular spectrum does not match the parabolic model, in which case the direction of arrival estimation accuracy degrades

Method used

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  • A method for estimating the direction of arrival of far-field narrowband signals based on numerical solution of directivity model
  • A method for estimating the direction of arrival of far-field narrowband signals based on numerical solution of directivity model
  • A method for estimating the direction of arrival of far-field narrowband signals based on numerical solution of directivity model

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Experimental program
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Embodiment 1

[0122] The simulation signal parameters are respectively set as: signal amplitude A=1, initial phase The pulse width of the far-field narrowband signal is 1s, the length of the received signal is 1.032s, the number of sampling points is N=4096, the total number of array elements is M=21, and the frequency of the far-field narrowband signal is f 0 =1250Hz, sampling frequency f s =4000Hz, the distance between adjacent array elements is d=0.6m, the propagation speed of the far-field narrowband signal in the medium is c=1500m / s (the propagation speed of sound in water), and the direction of arrival of the signal is θ T =50.7035°, SNR=-6dB.

[0123] Firstly, according to the given array parameters, the total number of pre-steering beams K=25 is automatically generated, from which we can obtain the scanning angle θ of the pre-steering beams k ,即[0 23.5565 33.5573 41.4096 48.1897 54.3147 60.000065.3757 70.5288 75.5225 80.4059 85.2198 90.0000 94.7802 99.5941 104.4775109.4712 114.62...

Embodiment 2

[0134] The simulation signal parameters are respectively set as: signal amplitude A=1, initial phase The pulse width length of the far-field narrowband signal is 1s, the length of the received signal is 1.032s, the number of sampling points is N=4096, the total number of array elements is M=15, and the frequency of the far-field narrowband signal is f 0 =1250Hz, sampling frequency f s =4000Hz, the distance between adjacent array elements is d=0.6m, the propagation speed of the far-field narrowband signal in the medium is c=1500m / s (the propagation speed of sound in water), and the direction of arrival of the signal is θ T =115.0576°, SNR=-6dB.

[0135] First, the total number of pre-guided beams K=18 is automatically generated according to the given array parameters, from which we can obtain the pre-guided beam scanning angle θ k , That is, [0 28.0725 40192 49.6798 58.0343 65.6843 72.895479.8358 86.6277 93.3723 100.1642 107.104.3157 121.9657 130.8808151.9275 180.0000] °.

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Abstract

The invention discloses a method for estimating the incoming wave direction of a far-field narrow-band signal based on numerical solution of a directivity model. The method includes: the first step: acquiring M-channel array element data x 1 (n),x 2 (n),…,x M (n); Step 2: Automatically generate pre-steering beam scanning angles θ with equal cosine intervals according to the given array parameters k and the total number of pre-steering beams K; the third step: for the known frequency f 0 The far-field narrowband signal of the known frequency is beamformed in the frequency domain, and the beam power spectrum P(θ corresponding to each pre-steering beam scanning angle of the far-field narrowband signal of the known frequency is obtained. k ); Step 4: Search the beam power spectrum P(θ k ) corresponding to the maximum value of the pre-steering beam number k p ; Step 5: Use the binary numerical solution method to solve the relative deviation of the incoming wave direction of the signal. The sixth step is to estimate the incoming wave direction of the far-field narrowband signal. The algorithm is based on conventional beamforming, which is simple to implement, small in computation and high in estimation accuracy, and is suitable for real-time engineering applications.

Description

technical field [0001] The invention belongs to the field of signal processing, and in particular relates to a method for estimating the direction of arrival of a far-field narrow-band signal based on numerical solution of a directivity model. Background technique [0002] The estimation of the direction of arrival of a target is a fundamental problem in array signal processing applications such as radar, sonar, acoustics, speech, and wireless communications, and plays an extremely important role in underwater acoustic and electronic reconnaissance processing. In addition, in modern mobile communication systems, direction of arrival estimation has important applications in improving the wireless system. [0003] At present, scholars at home and abroad have proposed many methods to estimate the direction of arrival of the target, such as minimum variance undistorted response and eigenvector-based direction of arrival estimation algorithms (such as MUSIC, Root-MUSIC, RV-Root-M...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/14G01S3/78G01S3/80
CPCG01S3/143G01S3/78G01S3/80Y02D30/70
Inventor 姚帅蒋宇轩刘昱含方世良
Owner SOUTHEAST UNIV
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