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Resolving directional information in sonar arrays

A directivity, array technology, applied in the re-radiation of sound waves, direction finders using ultrasonic/sonic/infrasonic waves, sound-producing instruments, etc., can solve the problem of poor public impression, inability to distinguish more than one sound source, and no practical value. And other issues

Inactive Publication Date: 2006-12-06
SONARTECH ATLAS
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite the extremely high resolution, relatively simple hardware, and minimal processing, this method has some drawbacks
For example, the technique requires precise calibration and cannot resolve more than one sound source at a distance without specialized fixtures
The method has poor public perception and no practical value

Method used

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  • Resolving directional information in sonar arrays
  • Resolving directional information in sonar arrays

Examples

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Embodiment Construction

[0023] The method for resolving directional information in the data stream received by the hydrographic array is based on the condition that the desired information is contained in the data stream from the array converter. So the problem is estimation, not blind application of algorithms.

[0024] see first figure 1 , the input is the raw data block 10 from the hydrophones of the hydrographic survey array. At each point in time when the signal is sensed, block reception is performed. A "coarse" beam 30 is formed at 20 using a linear combination of the sensor (complex) time series. Beamforming weights are specific to the array configuration, sensor placement, individual sensor directivity, and transmission pulse details including temporal envelope. The beams are "coarse" because there are 180 overlapping beams, each of which has a resolution of about 2 degrees, and they do not have sufficient resolution for hydrographic measurements. These beams can be displayed 40 to the u...

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Abstract

The invention concerns the resolution of directional information in sonar arrays. In particular it concerns a method for resolving such directional information, which may be useful in hydrographic surveys. The method comprises the steps of receiving a block of sensor data, containing time series from an array of hydrophone sensors, and beamforming to produce beam data including estimates of the directions of arrival from those beams and estimates of source strength. The method further comprises the steps of selecting a subset of the beams and refining the estimates of the directions of arrival from those beams, and, combining the refined estimates of directions of arrival from those beams with either the sensor data or the beam data, and performing a fit to the sensor data or beam data to develop an output containing refined direction of arrival data and refined source strength data.

Description

technical field [0001] The invention relates to distinguishing directivity information in a sonar array, in particular to a method for distinguishing directivity information which can be used for hydrological measurement. Background technique [0002] Active sonar antenna systems gather information about the direction and distance of objects or sound sources. To achieve angular resolution, the antenna needs to be directional. The desired directivity can be obtained by arranging and operating multiple independent omnidirectional hydrographic transducers. [0003] Typically, the hydrophone receiving array receives maximum intensity from the steered direction and also receives side lobes of lower intensity that deviate from the main direction. The overall pattern is the "beam pattern", and antennas are usually manipulated using a process called "beamforming" to obtain the desired pattern. [0004] Beamforming involves summing individual sensor signals with appropriate delays...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/00G01S3/80G10K11/34
CPCG10K11/34G01S3/8006
Inventor 罗里·尼兰德
Owner SONARTECH ATLAS
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