Accession Number : ADA294641

Title :   Estimation of the Local Vertical State for a Guided Munition Shell with an Embedded GPS/Micro-Mechanical Inertial Navigation System.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Lucia, David J.

PDF Url : ADA294641

Report Date : MAY 1995

Pagination or Media Count : 128

Abstract : This project considers a ballistic munition shell with an automated flight control system commanding control surface deflections to canards installed on the shell nose to guide the munition shell to its target. An algorithm to estimate the local vertical state of the shell spinning between 0 and 2 Hz is developed using GPS velocity measurements and 3 axis micro rate gyro measurements. Roll angle estimation performance is simulated and analyzed. Several shell roll rates between 0 and 2Hz are tested to quantify estimator performance across the specified roll rate frequency spectrum. A priori gravity turn information is substituted for GPS measurements to make an inertial only algorithm and the performance effects are quantified. Finally, an extended Kalman filter implementation of the inertial only roll estimating algorithm is developed and its performance is simulated and analyzed by first isolating the individual contributions of each sensor error and then considering the full suite of errors. (AN)

Descriptors :   *GLOBAL POSITIONING SYSTEM, *GUIDED PROJECTILES, *INERTIAL NAVIGATION, *BALLISTICS, VELOCITY, MATHEMATICAL MODELS, ALGORITHMS, COMPUTERIZED SIMULATION, FOURIER TRANSFORMATION, FREQUENCY, ANGLES, PITCH(MOTION), FLIGHT CONTROL SYSTEMS, KALMAN FILTERING, THESES, ESTIMATES, COMMAND AND CONTROL SYSTEMS, ERRORS, LEAST SQUARES METHOD, GRAVITY, SPINNING(MOTION), CALIBRATION, PROJECTILE TRAJECTORIES, BATCH PROCESSING, GUIDED WEAPONS, GYROSCOPES, ARTILLERY AMMUNITION, CANARD CONFIGURATIONS.

Subject Categories : Navigation and Guidance
      Guided Munitions
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE