Accession Number : ADA193302

Title :   Automatic Omega Station and LOP (Line of Position) Selection,

Corporate Author : DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)

Personal Author(s) : McMillan, J C

PDF Url : ADA193302

Report Date : Sep 1987

Pagination or Media Count : 132

Abstract : Omega is a worldwide navigation system based on 8 VLF transmitting stations dispersed widely around the globe. The phase difference between the signals of any two Omega stations can provide a line of position (LOP) on the earth's surface. Two such LOPs intersect to provide a position fix. Generally several LOPs are selected to improve the accuracy and reliability of the fix either by using a least squares technique or as in MINS (Marine Integrated Navigation System) a more sophisticated Kalman filter technique. The resulting position accuracy and reliability depends on many factors such as geometry and signal strength. This report describes these factors and a set of algorithms used by MINS to automatically select a best choice of 5 Omega stations and 4 LOPs. This includes a modal interference predictor and a multi-LOP geometric dilution of precision calculation. Keywords: Omega navigation; Position finding; Automatic; GDOP(Geometric Dilution of Precision); Canada.

Descriptors :   *KALMAN FILTERING, *LEAST SQUARES METHOD, *OMEGA NAVIGATION, ACCURACY, ALGORITHMS, CANADA, COMPUTATIONS, GLOBAL, INTEGRATED SYSTEMS, INTERFERENCE, MARINE TRANSPORTATION, NAVIGATION, POSITION FINDING, POSITION(LOCATION), PRECISION, PREDICTIONS, RELIABILITY, SIGNALS, STRENGTH(GENERAL)

Subject Categories : Underwater and Marine Navigation and Guidance
      Land and Riverine Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE