Calculation method of forward acoustic scattering Doppler frequency shift of moving target in water with irregular trajectory

A technology of Doppler frequency shift and calculation method, which is applied in the field of forward acoustic scattering Doppler frequency shift calculation of moving targets in water, and can solve the problems of unsuitable trajectory of irregular target and calculation method of unscattered Doppler frequency shift, etc. , to achieve the effect of rigorous process and accurate results

Active Publication Date: 2022-08-02
OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that it is only applicable to the situation where the target trajectory is a straight line, and it is not suitable for the situation of irregular target trajectory
[0010] At present, there is no calculation method for the forward acoustic scattering Doppler frequency shift of targets in water with irregular trajectories

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
  • Calculation method of forward acoustic scattering Doppler frequency shift of moving target in water with irregular trajectory
  • Calculation method of forward acoustic scattering Doppler frequency shift of moving target in water with irregular trajectory
  • Calculation method of forward acoustic scattering Doppler frequency shift of moving target in water with irregular trajectory

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1 The method for calculating forward acoustic scattering Doppler frequency shift of a moving target in water with irregular trajectory provided by the present invention, the main process is as follows figure 1 shown, including the following steps:

[0047] (1) Target track coordinate transformation

[0048] Select an appropriate reference position in the two-dimensional plane as the origin to establish a rectangular coordinate system, convert the earth's latitude and longitude coordinates of the transmitter, receiver and target trajectory into rectangular coordinates, and mark them as (x S ,y S ), (x T ,y T ) and (x R ,y R ), where the baseline length (transceiver connection length) can be expressed as:

[0049]

[0050] (2) Estimating the target movement speed

[0051] Denote the target trajectory coordinate sequence as (x T (t i ),y T (t i )), i=1,2,...,N, then the target is at any two adjacent moments t i and t i+1 The movement speed betwee...

Embodiment 2

[0082] Embodiment 2 The algorithm of the present invention is verified by using the target track data and the extraction results of the target forward acoustic scattering Doppler frequency shift of the Qiandao Lake scaled target forward acoustic scattering detection test in 2011.

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 invention relates to the technical field of marine acoustics, in particular to a method for calculating forward acoustic scattering Doppler frequency shifts of moving targets in water. The method for calculating the forward acoustic scattering Doppler frequency shift of a moving target in water with irregular trajectories includes: (1) Converting the earth's latitude and longitude coordinates of the transmitter, target trajectory and receiver into rectangular coordinates, and marking them as (x) S ,y S ), (x T ,y T ) and (x R ,y R ); (2) record the target trajectory coordinate sequence as (x T (t i ),y T (t i )), i=1,2,...,N, calculate the average speed in all time periods (3) Smooth the target trajectory to obtain a virtual straight line trajectory, respectively calculate the distance between the target and the receiving end to the intersection of its virtual straight line trajectory and the baseline Horizontal distance, the angle between the virtual straight line trajectory and the baseline; (4) Using the parameters calculated in steps (2) and (3), calculate the forward acoustic scattering Doppler frequency shift of the target at each moment. The invention solves the problem that the prior art cannot calculate the forward acoustic scattering Doppler frequency shift when the target movement track is irregular.

Description

technical field [0001] The invention relates to the technical field of marine acoustics, in particular to a method for calculating forward acoustic scattering Doppler frequency shifts of moving targets in water. Background technique [0002] In the forward acoustic scattering detection system, since the positions of the transmitter and receiver are fixed and only the target moves, the Doppler shift of the direct wave is zero and the target has a time-varying Doppler shift. The forward scattering Doppler frequency shift information of the target is extracted from the received acoustic signal, and the moving target in water that invades the transceiver line can be detected. However, the authenticity and accuracy of the extraction results of the forward scattering Doppler frequency shift of the target need to be compared and verified by the corresponding theoretical calculation results. [0003] There are two theoretical calculation methods for the forward acoustic scattering ...

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
Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/539
CPCG01S7/539
Inventor 何传林于洋孙守扬马健博吕红敏
Owner OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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