Two-dimensional background equalization method for orientation development map display

A azimuth history and equalization method technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of missing targets, severe background fluctuations, insufficient background equalization, etc., to suppress interference, improve display effects, and enhance the effect of target trajectory.

Active Publication Date: 2018-03-09
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

The improved OTA algorithm is based on the OTA algorithm, which combines the median filter and the threshold comparison method to achieve the purpose of removing large-scale fluctuations. figure 1 It is an implementation structure diagram of the improved OTA algorithm. The defect of this algorithm is: under the condition of low signal-to-noise ratio, due to the serious background fluctuation, the conventional background equalization is insufficient, and a large number of snowflakes will randomly appear in the azimuth history map ( spurious peaks), and even miss the target

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  • Two-dimensional background equalization method for orientation development map display
  • Two-dimensional background equalization method for orientation development map display
  • Two-dimensional background equalization method for orientation development map display

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[0070] The two-dimensional background equalization method for the azimuth history map of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0071] Here, the two-dimensional background equalization method of the azimuth history map of the present invention can not only be used for the drag line array with equal spacing, but also can process the azimuth history maps such as drag line array and circular array with unequal spacing.

[0072] Such as figure 2 As shown, a two-dimensional background equalization method for azimuth history map display, the method includes:

[0073] Step 101) Time-domain filtering is performed on the output of each array element channel through a pre-designed FIR filter, and only the signal processing frequency band is filtered to eliminate the influence of invalid frequency bands on the signal processing frequency band spectral leakage and the frequency domain beam;...

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Abstract

The invention discloses a two-dimensional background equalization method for orientation development map display. The method comprises steps that time domain filtering and pre-processing for output ofeach array element channel in a towed array are carried out, frequency domain wave beam formation is then carried out, and broadband energy integration of output sub-bands after frequency domain wavebeam formation is carried out to acquire wave beam output of different frequency bands; each frequency band is processed according to a search angel formed by the frequency domain wave beams, each angel is filtered according to the time direction, and a new output energy value of each angel is acquired; according to different frequency band outputs, background equalization processing on the present data is carried out according to the angle direction; lastly, wild point removal processing and image display are carried out for the different frequency band outputs. The method is advantaged in that large snowflake point interference caused by a routine background equalization algorithm can be effectively inhibited, the target locus is enhanced, as proved by simulation and experiment data, the orientation development map display effect can be effectively improved.

Description

technical field [0001] The invention belongs to the field of underwater acoustic signal processing, and in particular relates to a two-dimensional background equalization method for displaying an azimuth history map in a digital multi-beam sonar system. Background technique [0002] In the digital multi-beam sonar system, the azimuth history map display is a way to realize the target detection. Due to the non-stationarity in time and non-uniformity in space of the marine environmental noise, there will be patches of strong interference on the azimuth history image. [0003] The background equalization technology is mainly used to remove the noise interference on the azimuth history map / slice, so that the display screen becomes "clean", which can improve the overall performance of the azimuth history display. However, under the condition of low signal-to-noise ratio, due to the severe background fluctuation, the conventional background equalization is insufficient, and a lar...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/56
CPCG01S7/56
Inventor 鲍习中陈新华方华刘磊
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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