Title:
DATA PROCESSING METHOD FOR UNDERWATER STRAPDOWN GRAVITY MEASUREMENT
Document Type and Number:
WIPO Patent Application WO/2022/006921
Kind Code:
A1
Abstract:
A data processing method for underwater strapdown gravity measurement, comprising performing error estimation and compensation on the position of a laser gyro single-shaft rotational strapdown inertial navigation system, and then obtaining an accurate position by means of a low-pass filter; taking a new accurate position, the velocity of a pedometer, and the water depth of a depthometer as the appearance measurement of a strapdown gravimeter, and using extended Kalman filtering to calculate a specific force value of an accelerometer under a local geographical coordinate system; and after gravity corrections, using positive and negative integrated Kalman filtering to obtain a local gravity anomaly value. The data processing method for underwater strapdown gravity measurement can satisfy the underwater measurement requirements for long time, high precision and low costs.
Inventors:
CAI TIJING (CN)
WU LIMING (CN)
WU LIMING (CN)
Application Number:
PCT/CN2020/101760
Publication Date:
January 13, 2022
Filing Date:
July 14, 2020
Export Citation:
Assignee:
UNIV SOUTHEAST (CN)
International Classes:
G01V7/06; G01C21/18
Foreign References:
| CN106405670A | 2017-02-15 | |||
| CN101769742A | 2010-07-07 | |||
| CN109141436A | 2019-01-04 | |||
| CN103389097A | 2013-11-13 | |||
| US20160327394A1 | 2016-11-10 | |||
| US20190204123A1 | 2019-07-04 |
Other References:
ZHU YANHUA, CAI TIJING, LU ZHEN: "The Simulation Research on SINS/Log/Gravity Passive Integrated Navigation System", JOURNAL OF PROJECTILES, ROCKETS, MISSILES AND GUIDANCE, vol. 31, no. 4, 31 August 2011 (2011-08-31), pages 5 - 7, XP009533331, ISSN: 1673-9728
Attorney, Agent or Firm:
NANJING ZHONGLIAN PATENT AGENCY CO., LTD. (CN)
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