Accession Number : AD0868905

Title :   Data Smoothing for Enhancement of Strapdown Inertial System Accuracy: Interpolative-Predictive Algorithms.

Descriptive Note : Final rept.,

Corporate Author : ANALYTIC SCIENCES CORP READING MA

Personal Author(s) : Sutherland, Arthur A., Jr. ; Bongiovanni, Paul L.

Report Date : 31 AUG 1969

Pagination or Media Count : 116

Abstract : A novel approach to computing the attitude transformation matrix of a strapdown inertial system is investigated. While related to prior techniques which recover angular rate information and integrate the attitude matrix differential equation, this approach intentionally delays the angular rate calculations in order to incorporate 'future' gyro outputs. It is demonstrated that the ensuing delays in calculation of position and velocity do not cause significant navigation errors and that the subject technique gives generally superior attitude-keeping performance over a wide range of conditions. (Author)

Descriptors :   *INERTIAL GUIDANCE, ALGORITHMS, GYROSCOPES, ACCELEROMETERS, ATTITUDE INDICATORS, DIFFERENTIAL EQUATIONS, TRANSFORMATIONS(MATHEMATICS), NUMERICAL ANALYSIS, NUMERICAL INTEGRATION, INTERPOLATION, COMPUTER PROGRAMMING.

Subject Categories : Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE