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Observability and Performance Analysis of Velocity Measurements with Lever Arm Aided INS
Aviram Borko 1 , Itzik Klein 2 , Gilad Even-Tzur 1

1  Department of Mapping and Geo-Information Engineering, Technion – Israel Institute of Technology
2  Research Fellow, Rafael – Advanced Defense Systems

Published: 14 November 2017 by MDPI AG in Proceedings in 4th International Electronic Conference on Sensors and Applications
MDPI AG, Volume 2; 10.3390/ecsa-4-04893
Abstract:

In most autonomous vehicles the navigation subsystem is based on Inertial Navigation System (INS). Regardless of the INS grade, its navigation solution drifts in time. To avoid such a drift, the INS is fused with external sensor measurements. Recent publications show that the lever-arm, the relative position between the INS and aiding sensor, has influence on the navigation performance.

Most published research in this field is focused on INS/GNSS fusion with GNSS position updates only where performance and analytical observability analysis were made to examine the consequence of vehicle maneuvers on the estimation of the lever-arm states.

Yet, besides position updates, a variety of sensors measuring the vehicle velocity vector are available including GNSS and a Doppler velocity log. As in position measurements, when performing INS/velocity measurements fusion, the lever-arm must be taken account for. In this paper, an analytical observability and performance analysis for velocity measurements with lever-arm aided INS is derived for stationary conditions. The observable and unobservable subspaces are derived for two error-stets models: 1) a 12 error-state model (the position and lever-arm error-states are not included) yet the lever-arm is present in the measurement equation and 2) a 15 error-state model including the lever-arm error-states. The analytical closed form expressions are verified by numerical simulation.


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