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Method and apparatus for broadside horizontal array motion aperture synthesis positioning

An aperture synthesis and horizontal technology, which can be used in measurement devices, re-radiation of sound waves, utilization of re-radiation, etc., and can solve the problems of poor practicability and low precision.

Active Publication Date: 2009-07-01
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the defects of low precision and poor practicability in the existing three-dimensional positioning through matching fields or short horizontal real arrays, the present invention proposes a method and device for synthetic positioning of horizontal array moving apertures

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  • Method and apparatus for broadside horizontal array motion aperture synthesis positioning
  • Method and apparatus for broadside horizontal array motion aperture synthesis positioning
  • Method and apparatus for broadside horizontal array motion aperture synthesis positioning

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Embodiment 1

[0048] figure 1 a shows the composition structure of a side horizontal array motion aperture synthetic positioning device according to Embodiment 1 of the present invention, mainly including a side horizontal array, a time-frequency separator, a phase estimator, a delay compensator, and a synthetic aperture device , zero control mode filter, maximum likelihood decision device and other parts.

[0049]The side horizontal array is used to collect the underwater acoustic signal data and transmit the data to the time-frequency separator; the time-frequency separator is used to separate the time unit of the side horizontal array signal based on FFT, and the obtained result is sent to the phase estimator; The phase estimator is used to estimate the phase of each narrow-band time unit that overlaps in space between the array elements, and the obtained phase factors are sent to each delay compensator respectively; Features Perform delay sampling on the element time unit and perform p...

Embodiment 2

[0135] refer to figure 1 , 2 , 3, 4a, 4b, 4c, the present embodiment adopts the broadside horizontal array installed on the submarine as the equipment for collecting underwater acoustic data, and carries out the remote three-dimensional positioning of the target accordingly, which specifically includes the following steps:

[0136] (1) During the movement of the submarine, the broadside horizontal array collects underwater acoustic data, and decomposes the broadband received data received by the array element into several narrowband time units through a time-frequency separator;

[0137] Step 2) to step 5) are exactly the same as step 2) to step 5) in embodiment 1.

[0138] In this embodiment, the three-dimensional positioning effect obtained by the inventive method is completely consistent with the three-dimensional positioning effect in Embodiment 1.

Embodiment 3

[0140] refer to figure 2 , 3 , 4a, 4b, 4c, 5. In this embodiment, the towed array installed on the ship is used as the equipment for collecting underwater acoustic data, and the remote three-dimensional positioning of the target is carried out accordingly, which specifically includes the following steps:

[0141] (1) During the movement of the ship, the towed array collects underwater acoustic data, and decomposes the broadband received data received by the array elements into several narrowband time units through a time-frequency separator;

[0142] Step 2) to step 5) are exactly the same as step 2) to step 5) in embodiment 1.

[0143] In this embodiment, the system configuration of the device is as follows Figure 5 As shown, it is mainly composed of towed array, time-frequency separator, phase estimator, delay compensator, synthetic aperture device, zero point control modulus filter, maximum likelihood decision device and other parts connected sequentially.

[0144] In ...

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Abstract

The invention discloses a horizontal array motion aperture synthesis positioning method and a device therefore. The horizontal array motion aperture synthesis positioning method comprises: decomposing the underwater acoustic data collected by the array elements of a horizontal array into a plurality of time units; evaluating the phases of each narrowband time unit laminated spatially between the array elements, to obtain a phase evaluation factor, processing time delay sampling and phase compensation on the array element time units; processing aperture synthesis for the time sequence obtained by different array elements in one narrow band, to form a large aperture virtual horizontal array; according to zero point control full normal mode filter theory, processing zero point control mode filtration on the large aperture virtual horizontal array, to obtain target mode information; using the target mode information to obtain three-dimension positioning result of the target according to maximum likelihood method. The method and device can obtain high positioning accuracy, with simple and practical process. The invention can realize real-time application without much additional computing resource.

Description

technical field [0001] The invention relates to the technical field of sonar for underwater unmanned submersibles, in particular to a method and device for positioning by using side horizontal array and movement aperture synthesis. Background technique [0002] Long-range three-dimensional positioning of targets is an important technical problem in the field of underwater acoustic detection technology. For linear arrays, ordinary beamforming methods cannot be used for depth determination, but methods that can be used for depth determination, such as the matched field method, mostly use vertical arrays. For horizontal arrays, since the positioning accuracy is proportional to the spatial scale length of the horizontal array, a larger horizontal aperture scale is often required to ensure accurate three-dimensional positioning. However, for a small carrier such as an underwater unmanned submersible, its length is often only a few meters, so the physical aperture of the side hor...

Claims

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Application Information

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IPC IPC(8): G01S7/52G01S15/89
CPCG01S15/8904G01S7/52004
Inventor 李宇黄海宁李淑秋张春华
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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