TRUNAV: A LOW-COST GUIDANCE/NAVIGATION UNIT INTEGRATING A SAASM-BASED GPS AND MEMS IMU IN A DEEPLY COUPLED MECHANIZATION

摘要

J. Beser, S. Alexander, R. Crane, S. Rounds, J. Wyman This paper addresses the need within the Projectile and Precision Guided Munitions marketplace for a highprecision guidance and navigation unit with a size, weight, power and cost suitable for ogive and eventually fusewell integration. Rather than being driven by separate GPS and IMU performance specifications, the TRUNAVTM navigation performance should be considered at the system level by enhancing navigation output of the combined GPS/IMU system. In order to optimize performance when subjected to jamming and/or high dynamics, the TRUNAVTM includes ultra-tightly (also known as deeply) coupled GPS/Inertial Measurement Unit (IMU) integration as well as hardware appliques. As part of the size, weight, power, and cost reduction, the IMU digital signal processing, guidance function, control function and fuzing function will be gradually re-hosted on the GPS receiver processor(s), thereby reducing the overall number of boards.