An Emergency Positioning System Fusing GEO Satellite Doppler Observation and INS for SOTM

This article presents a newly invented emergency positioning system deployed on a satellite communication on-the-move (SOTM) platform, which can extend the SOTM communication function to the positioning function. Inherent to the SOTM system's high reliability, this emergency positioning system...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2021, Vol.70, p.1-4
Main Authors: Yuan, Ding, Qin, Yongyuan, Wu, Zongwei, Shen, Xiaowei
Format: Article
Language:English
Subjects:
Doppler effect
Error correction
Error reduction
Frequency measurement
Geosynchronous orbits
Global navigation satellite system
graph optimization (GO)
Inertial navigation
Inertial platforms
Measuring instruments
mobile satellite antennas
Navigation
Navigation systems
Observability
Optimization
Position measurement
pre-integration
Satellite communications
Satellite observation
Satellites
Trajectory
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Summary:This article presents a newly invented emergency positioning system deployed on a satellite communication on-the-move (SOTM) platform, which can extend the SOTM communication function to the positioning function. Inherent to the SOTM system's high reliability, this emergency positioning system can effectively estimate the vehicle's position by fusing a geosynchronous orbit (GEO) satellite Doppler frequency observation and inertial navigation system (INS) of a SOTM-mounted moving vehicle when the global navigation satellite system (GNSS) is unavailable. It is a great challenge to use GEO Doppler frequency measurement with weak observability to correct the INS's cumulative error to estimate the position of the vehicle. In this article, the traditional inertial measurement unit (IMU) pre-integration model is improved to meet the needs of large-scale and high-precision navigation. In addition, we use graph optimization (GO) to estimate all states in the trajectory, which can effectively improve the observability of the error and reduce the nonlinear influence. We evaluated the system on a Ku-band SOTM platform, and the experimental results indicate that the system can achieve a convergent positioning accuracy of tens of meters. This method can provide emergency positioning in the case of GNSS interference.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2021.3096568