This paper will present preliminary results concerning the effect of gravity deflections of the vertical (DoV) on inertial navigation system (INS) accuracy. Accurate DoV information, supplied by the National Imagery and Mapping Agency (NIMA), will augment the INS and its navigation solution. Various land-based and airborne scenarios; both with and without Global Positioning System (GPS) coupling to the INS, will be investigated. The combination of DoVs with zero velocity update (ZUPT) procedures will also be investigated. The Airborne Integrated Mapping System (AIMS) software, designed at The Ohio State University (OSU), will be used to analyze the results (land and air). This paper will only investigate the impact NIMA DoVs have on improving the navigation solution of an INS. Research between NIMA and OSU is ongoing that will utilize the results of this study to improve the georeferencing accuracy of land-based and airborne mobile imaging sensors. The current results are based on use of a high-end inertial measuring unit (IMU), however, the future work will include medium and low-end inertial sensors, including a micro-electronic measuring system (MEMS) IMU.
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