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The major challenge of using low-cost micro-electro-mechanical-system (MEMS) inertial navigation system (INS) is the rapid navigation error drift when the aiding sensors are unavailable. A self-contained dynamics-aided error correction method is developed to overcome this problem. Additional measurements are generated to update the navigation filter and control the navigation error based on the knowledge of land vehicle dynamics. The contribution of the proposed dynamics-aided method to INS/GPS navigation during long GPS outages has been demonstrated through field tests.