Accession Number : AD0670004

Title :   APPLICATION OF STATISTICAL SMOOTHING TECHNIQUES TO INERTIAL NAVIGATION.

Descriptive Note : Technical rept.,

Corporate Author : HARVARD UNIV CAMBRIDGE MA DIV OF ENGINEERING AND APPLIED PHYSICS

Personal Author(s) : Mehra, R. K.

Report Date : APR 1968

Pagination or Media Count : 31

Abstract : All inertial navigation systems are excited by random error inputs such as gyro drift rates, accelerometer errors etc. These errors make the position and velocity errors of the inertial navigator grow unbounded with time if no external measurements are made. Statistical smoothing techniques provide methods of estimating these random inputs from test runs of the system. (Smoothing involves estimating the state of a system at time t using measurements made both before and after time t.) In the present report, a ship's inertial navigation system is considered. It is shown that by using smoothing techniques, uncertainties in the knowledge of random error sources, particularly, gyro drift rates, can be significantly reduced. (Author)

Descriptors :   (*INERTIAL NAVIGATION, CORRECTIONS), ERRORS, STATISTICAL ANALYSIS, NUMERICAL ANALYSIS, APPROXIMATION(MATHEMATICS), GYROSCOPES, ACCELEROMETERS, DRIFT, SHIPBOARD, VELOCITY, TIME, NOISE, MATRICES(MATHEMATICS).

Subject Categories : Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE