Enhanced-accuracy GPS navigation using the interacting multiple-model estimator

Xiangdong Lin; Thiagalingam Kirubarajan; Yaakov Bar-Shalom; X. Rong Li

doi:10.1117/12.492767

26 November 2001 Enhanced-accuracy GPS navigation using the interacting multiple-model estimator

Xiangdong Lin, Thiagalingam Kirubarajan, Yaakov Bar-Shalom, X. Rong Li

Proceedings Volume 4473, Signal and Data Processing of Small Targets 2001; (2001) https://doi.org/10.1117/12.492767
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

This paper presents an Interacting Multiple-Model (IMM) estimator based approach to navigation using the Global Positioning System (GPS). The “soft-switching” IMM estimator obtains its estimate as a weighted sum of the individual estimates from a number of parallel filters matched to different motion modes of the platform, e.g., nearly constant velocity and maneuvering. The goal is to obtain the maximum navigation accuracy from an inexpensive and light GPS-based system, without the need for an inertial navigation unit, which would add both cost and weight. In the case of navigation with maneuvering, for example, with accelerations and decelerations, the IMM estimators can substantially improve navigation accuracy during maneuvers as well as during constant velocity motion over a conventional (extended) Kalman Filter (KF), which is, by necessity, a compromise filter. This paper relies on a detailed modeling of GPS and presents the design of a navigation solution using the IMM estimator. Two different IMM estimator designs are presented and a simulated navigation scenario is used for comparison with two baseline KF estimators. Monte Carlo simulations are used to show that the best IMM estimator significantly outperforms the KF, with about 40-50% improvement in RMS position, speed and course errors.

Citation Download Citation

Xiangdong Lin, Thiagalingam Kirubarajan, Yaakov Bar-Shalom, and X. Rong Li "Enhanced-accuracy GPS navigation using the interacting multiple-model estimator", Proc. SPIE 4473, Signal and Data Processing of Small Targets 2001, (26 November 2001); https://doi.org/10.1117/12.492767

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