Accession Number : ADA183461

Title :   Reconciling the Navigational Grid with the Inertial Navigation System.

Descriptive Note : Technical paper,

Corporate Author : DEFENSE MAPPING AGENCY AEROSPACE CENTER ST LOUIS AFS MO

Personal Author(s) : Wanner,Lori D ; Hopkins,John

PDF Url : ADA183461

Report Date : Mar 1987

Pagination or Media Count : 16

Abstract : The navigation grid overprinted on certain small scale navigation and planning charts published by the Defense Mapping Agency was originally intended for use in polar regions by navigators utilizing such techniques as celestial navigation and LORAN-C. The use of grid north gave the navigator a uniform reference direction to use rather than the highly convergent meridians. The concept of a non-changing north is remarkably like that encountered in an inertial navigation system with the local-level platform untorqued (alpha-wander mode). However, the directional angles computed by the inertial navigation system rapidly diverge from those measured from the charts. This paper explores the reason for this divergence and proposes a solution. (Author)

Descriptors :   *CELESTIAL NAVIGATION, *CHARTS, *INERTIAL NAVIGATION, *POLAR REGIONS, ANGLES, CELESTIAL NAVIGATION, CHARTS, DIRECTIONAL, GRIDS, INERTIAL NAVIGATION, NAVIGATION, NAVIGATORS, NORTH(DIRECTION), PLANNING, POLAR REGIONS

Subject Categories : Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE