Velocity Determination for an Inverted Pseudolite Navigation Reference System
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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As navigation systems continue to improve in performance and features, the Air Force must develop better Navigation Reference Systems NRS to keep pace with technology. Specifically, with the advent of enhanced, integrated Global Positioning System GPS and Inertial Navigation System INS navigators, emphasis is placed on the measuring performance in the presence of GPS jamming. To meet these needs, a new NRS, dubbed the Sub-Meter Accuracy Reference System SARS, is being developed by the 746th Test Squadron, Holloman AFB, New Mexico. SARS uses a unique, inverted GPS pseudolite positioning system to determine a reference trajectory. This research investigates two pos processing methods of determining velocity from a discrete position data at a constant data rate. The first method employs numerical differentiation along with digital filters provide noise reduction. The second method uses kinematic model based Kalman filter and smoothing to determine the reference velocity.
- Navigation and Guidance