Underwater target sonar imaging method based on inverse synthetic aperture principle

A technology of inverse synthetic aperture and underwater targets, applied in the field of sonar imaging of underwater targets based on the principle of inverse synthetic aperture

CN109991608AActive Publication Date: 2019-07-09HARBIN ENG UNIV
2 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-07-09

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention puts forward an underwater target sonar imaging method based on an inverse synthetic aperture principle. The method mainly comprises the following three steps that: firstly, carrying outthe distance dimension processing of an echo, wherein the distance dimension processing includes two main processes, i.e., distance dimension compression and translation compensation; then, carryingout the direction dimension processing of the echo, considering the complex swinging of a UV (Underwater Vehicle), and adopting a LVD (Lv's Distribution) algorithm to carry out parameter estimation onthe direction dimension echo; and finally, carrying out target image generation, calculating the horizontal and vertical coordinates and the scattering coefficient of a scattering point through a parameter estimation result, and carrying out reconstruction to form the acoustic image of the target. The invention belongs to a sonar processing method which can be applied to fields, including underwater target identification, underwater battlefield situation perception and the like.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of sonar signal processing, in particular to an underwater target sonar imaging method based on the inverse synthetic aperture principle. Background technique

[0002] Imaging sonar is a new type of sonar with two-dimensional high resolution in distance and azimuth dimensions, and can obtain acoustic images of underwater targets. Among them, the high resolution in the range dimension mainly depends on measuring the time delay of the acoustic signal propagating between the sonar and the target; while the high resolution in the azimuth dimension is achieved through the interference processing between different signals.

[0003] According to the different sources of interference signals, imaging sonar can be divided into real aperture sonar and synthetic aperture sonar. Real aperture sonar performs interference processing on acoustic signals received by hydrophones at different locations in space at the same t...

Examples

Embodiment Construction

[0078] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0079] The working situation of ISAS system is as follows: figure 1 shown. In the figure, the sonar is located at point P; it is assumed that the target is a submarine. Point O is the center of gravity of the submarine, A is any acoustic scattering point on the submarine, and the coordinate vector of point A relative to point O is x. The line of sight direction of the submarine, that is, the unit vector of the PO line direction is r. The submari...