Accession Number:

ADA090717

Title:

Optimal Estimation of Missile Free-Flight Trjectory. Comparative Results of Linear and Nonlinear Kalman Filter Approaches.

Descriptive Note:

Final rept. Apr-Jul 80,

Corporate Author:

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s):

• Groutage,F. Dale

Report Date:

1980-07-10

Pagination or Media Count:

65.0

Abstract:

This is a technical report on the application of optimal estimation theory for estimating the trajectory of a free-flight missile, as a means of evaluating missile performance. Several approaches were investigated linear Kalman filter working in Cartesian Coordinates and nonlinear extended Kalman filter implemented in Cartesian Coordinates. A six-degree of freedom simulation was used to generate the free-flight trajectory of the missile. A simulated radar, positioned at the origin of the inertial ground reference frame, generated range, azimuth, and elevation observation data. An analysis was conducted in the following three areas 1 initialization, 2 Q matrix weighting, and 3 observation of noise variances. The nonlinear filter approach linear dynamics with nonlinear measurements proved to exhibit superior performance over a strictly linear filter approach. further investigations in specific areas, are recommended. Author

Descriptors:

• *GUIDED MISSILE TRAJECTORIES
• *MATHEMATICAL PREDICTION
• *FREE FLIGHT
• TAYLORS SERIES
• COMPARISON
• KALMAN FILTERING
• PROBABILITY DENSITY FUNCTIONS
• ESTIMATES
• LINEAR FILTERING
• WEIGHTING FUNCTIONS
• FLOW CHARTING
• CONFIDENCE LEVEL
• Q FACTOR
• CARTESIAN COORDINATES

Subject Categories:

• Guided Missile Trajectories, Accuracy and Ballistics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE