Adaptive cancellation method for interference of underwater reverberation

An adaptive and reverberation technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as ineffective detection of targets, and achieve the effect of improving detection performance and suppressing reverberation interference.

Inactive Publication Date: 2012-02-15
HARBIN ENG UNIV
View PDF2 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing adaptive noise cancellation method applied to underwater reverberation adaptive cancellation has achieved certain results, but its disadvantage is that the reference signal o

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Adaptive cancellation method for interference of underwater reverberation
  • Adaptive cancellation method for interference of underwater reverberation
  • Adaptive cancellation method for interference of underwater reverberation

Examples

Experimental program
Comparison scheme
Effect test

specific example

[0033] Detect underwater sinking targets. When detecting sinking targets, the bottom reverberation is the main interference. The receiving array is a linear array with 16 elements, and the distance between the elements is 0.58cm. The transmitting array is an area array, which can illuminate a large area of ​​the seabed. The transmitting signal is a linear frequency modulation signal with a bandwidth of 20kHz and a pulse width of 2.5ms. Splitting the beam to form two left and right beams, the beam direction is -4 degrees (the normal direction of the array is 0 degrees, the left direction is negative, and the right direction is positive), the left and right beams are each obtained by 15 array element data beamforming, using delay beams Form an algorithm. Perform phase inversion processing on the left beam data, add it to the right beam data to obtain a reference signal, respectively perform reverberation adaptive cancellation on the left and right beam data, the filter is an F...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The objective of the invention is to provide an adaptive cancellation method for an interference of underwater reverberation. The method comprises the following steps that: splitting beam formation is carried out on receiving signals of N array elements so as to form left and right homodromous wave beam outputs x1 and x2; and the left and the right wave beams are respectively formed by M array element data wave beams; phase inversion processing is carried out on the left wave beam output data and then the processed left wave beam output data is added by the right wave beam output data; and added data is utilized as a reference signal of an adaptive reverberation canceller; adaptive reverberation cancellation is carried out respectively on the left wave beam signal x1 and the right wave beam signal x2, wherein the adaptive reverberation canceller is an adaptive filter with an FIR structure, the input signal is a wave beam output signal and the reference signal is data d that is obtained by addition of the left wave beam output data that has been processed by the phase inversion processing and the right wave beam output data; and multiplication and integration processing is carried out on two outputs e1 and e2 after the adaptive reverberation canceller by the left and the right wave beam signals so as to obtain a final output y. According to the invention, the reverberation interference is further inhibited and the detection performance is improved.

Description

technical field [0001] The invention relates to a target echo signal detection method in the field of sinking target detection. Background technique [0002] The existing adaptive noise cancellation method applied to underwater reverberation adaptive cancellation has achieved certain results, but its disadvantage is that the reference signal often contains the target echo signal, which makes the reverberation cancelled, but also the target echo signal. The echo signal also cancels out, so the target cannot be effectively detected. Contents of the invention [0003] The object of the present invention is to provide an adaptive cancellation method of underwater reverberation interference for target echo signal detection in the underwater reverberation background. [0004] The purpose of the present invention is achieved like this: [0005] The present invention is an adaptive cancellation method for underwater reverberation interference, which is characterized in that: ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01S7/36
Inventor 朱广平孙辉
Owner HARBIN ENG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap