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Underwater enhanced positioning method based on acoustic measurement error correlation

A technology to enhance positioning and correlation, applied in positioning, measurement devices, radio wave measurement systems, etc., can solve the problems of unable to locate underwater targets autonomously, limited positioning accuracy, destroying confidentiality, etc., to improve underwater positioning accuracy, In terms of confidentiality, the effect of improving the accuracy of acoustic signals

Active Publication Date: 2016-09-28
HARBIN ENG UNIV
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AI Technical Summary

Problems solved by technology

However, the existing differential positioning methods rely on the short-baseline positioning system, and the array elements are densely distributed. The coordinate accuracy of each array element depends on the short-baseline positioning system, and the positioning accuracy is limited. Positioning also breaks confidentiality

Method used

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  • Underwater enhanced positioning method based on acoustic measurement error correlation
  • Underwater enhanced positioning method based on acoustic measurement error correlation
  • Underwater enhanced positioning method based on acoustic measurement error correlation

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Embodiment

[0036] The present invention is an underwater base station differential positioning method based on acoustic measurement error correlation, and the specific steps include:

[0037] Step 1, the user sends a positioning request signal

[0038] The underwater user uses the underwater navigation transceiver to broadcast the underwater acoustic positioning request signal to the intelligent buoy positioning hydrophone and the underwater reference station.

[0039] The user adopts an active positioning method and sends an underwater acoustic positioning request signal when there is a positioning demand. The coordinates of the underwater base station (Base) are fixed and known, denoted as (x b ,y b ,z b ).

[0040] Step 2, calculate the position and clock of each smart buoy on the reference network

[0041] After each smart buoy (Float) in the reference network obtains the positioning request of the underwater user, it receives the GNSS satellite signal and the differential corre...

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Abstract

The invention belongs to the field of underwater navigation positioning, and specifically relates to an underwater enhanced positioning method based on acoustic measurement error correlation. The underwater enhanced positioning method includes following steps. An underwater navigation transceiver is used to send an acoustic positioning request signal to a smart buoy positioning hydrophone and an underwater reference station through a broadcasting means. Each smart buoy in a referential network, after obtaining a positioning request of an underwater user, conducts overwater difference positioning by simultaneously receiving GNSS satellite signals and the difference correction information of a difference base station, to obtain accurate position coordinate and buoy synchronous time. A data processing module integrated in each smart buoy conducts acoustic encoding and modulating for the position of the data processing module and sending time. The underwater base station receives buoy acoustic positioning signals synchronous with an underwater user, and an acoustical signal spatial correlation error item extracted by the underwater base station serves as acoustical signal propagation difference information. The precision of acoustic measurement signals is improved, advantages in security is ensured, and underwater positioning precision is genuinely improved.

Description

technical field [0001] The invention belongs to the field of underwater navigation and positioning, and specifically relates to a kind of intelligent buoys based on global navigation satellite system (GNSS) differential positioning to form a dynamic reference network for underwater positioning. The underwater fixed base station extracts acoustic measurement error related items and broadcasts them to the user terminal, and corrects the user terminal acoustic measurement information to realize a high-precision underwater enhanced positioning method based on acoustic measurement error correlation. Background technique [0002] Ocean exploration and development have far-reaching significance to national development strategies. In order to expand the development and utilization of the underwater environment, it is urgent to carry out research on high-precision positioning methods for underwater navigation, hydrological monitoring, and seabed exploration. The underwater positioni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/18
CPCG01S5/18
Inventor 李亮刘亚贾春崔鹏丁继成赵琳
Owner HARBIN ENG UNIV
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