Modeling and Analysis of Measurement Time Synchronization Error in Transfer Alignment

Cheon-Joong Kim, Hyun-Seok Kim, Heung-Won Park

Abstract:	Measurement time synchronization between MINS and SINS in the transfer alignment is very important. It has been well known that the synchronization error degrades the alignment performance and makes some navigation errors on the transfer alignment of SINS. Therefore there are many schemes to eliminate that synchronization error but the compensation scheme through the estimation by Kalman filter is generally used. In this paper, we design the Kalman filter which has 19 state variables for the transfer alignment and do observability analysis for measurement time synchronization error. We also propose the new method to analyze the navigation error originated in SINS by the synchronization error through observability analysis. Using the proposed new method, we show that the generalized navigation error equation originated from measurement time synchronization error can be derived and is equivalent to that in the previously published paper. Generally synchronization error is modeled as a random constant. But we propose the new model of measurement time synchronization error which consists of constant-type error, drift-type error and jumptype error generated by the different communication cycles among sub-systems. We also propose the new compensation scheme for measurement time synchronization error and confirm that the scheme has a good performance through a simulation.
Published in:	Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008) September 16 - 19, 2008 Savannah International Convention Center Savannah, GA
Pages:	528 - 536
Cite this article:	Kim, Cheon-Joong, Kim, Hyun-Seok, Park, Heung-Won, "Modeling and Analysis of Measurement Time Synchronization Error in Transfer Alignment," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 528-536.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In