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Underwater target azimuth estimation method based on bat binaural positioning model

A binaural positioning and azimuth estimation technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of inapplicability to hyperbolic FM signals and inability to improve azimuth resolution with hyperbolic FM signals, thereby reducing the complexity of the array and improving the azimuth resolution. The effect of azimuth resolution and reduction of development cost

Active Publication Date: 2017-03-22
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

The binaural positioning model simulates the signal processing method of bats and improves the azimuth resolution of the target under the simplified array. However, the vocalization signals of bats are mainly hyperbolic FM signals, and the model is based on large-bandwidth linear FM signals. This makes the model not suitable for dealing with hyperbolic FM signals, and cannot use the nonlinear characteristics of hyperbolic FM signals to further improve the azimuth resolution
In addition, the large bandwidth signal also poses a huge challenge to the fabrication of underwater acoustic transducers

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  • Underwater target azimuth estimation method based on bat binaural positioning model
  • Underwater target azimuth estimation method based on bat binaural positioning model
  • Underwater target azimuth estimation method based on bat binaural positioning model

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Embodiment Construction

[0029] 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.

[0030] The realization steps of the present invention are as follows:

[0031] 1) Calculate the value of hyperbolic frequency modulation parameter K of the transmitted signal according to the frequency band of the transmitted signal required by the sonar system, and the calculation formula is as follows:

[0032] K=Tf max f min / B (1)

[0033] where T is the signal duration, f max , f min are the maximum and minimum frequencies of the transmitted signal, and B is the signal bandwidth. The processing frequency band of the improved binaural positioning model is consistent with the frequency band of the transmitting signal.

[0034] 2) Improve the basic parameters of the model:

[0035] 2.1) The number of channels of the improved binaural positioning model is set accord...

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Abstract

The invention provides an underwater target azimuth estimation method based on a bat binaural positioning model. According to the frequency band of a transmitting signal, a binaural positioning model parameter suitable for processing a hyperbolic frequency modulation signal is calculated, combined with the theoretical positions of interference peak and valley points in an echo signal, an external ear valley value frequency interval and the frequency response of an acoustic transducer are determined, and finally the azimuth of a target is calculated according to the external ear valley value frequency calculated by the model. According to the underwater target azimuth estimation method, the azimuth discrimination of the binaural positioning model is improved, thus an active sonar can achieve good azimuth discrimination in the condition of double array elements, and the performance is much better than that of a conventional beamforming method.

Description

technical field [0001] The invention belongs to the technical field of underwater target detection, and in particular relates to a method for improving the azimuth resolution of underwater targets by using a bat binaural positioning model under the condition of limited platform conditions. Background technique [0002] For active sonar, high azimuth resolution is often required to accurately detect targets. Traditional methods often use underwater acoustic transducer arrays and beamforming to obtain spatial gain and estimate target orientation. However, the transducer array is generally arranged at a half-wavelength interval. To obtain high azimuth estimation accuracy, it is necessary to increase the number of array elements or increase the frequency of emitting sound waves. However, due to the limited size of the platform, the number of array elements that can be arranged often cannot meet the requirements, and increasing the frequency of the sound wave will increase the p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/539
CPCG01S7/539
Inventor 刘华锋
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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