GDOP of Hyperbolic Navigation Systems and Satellite Navigation Systems

Abstract

GDOP is the abbreviation of geometric dilution of precision. This abbreviation was used originally for showing coverage of Omega navigation system and now is using NAVSTAR GPS for calculating criterions of satellite selections, etc. This report introduced generalized calculating method of GDOP for verious hyperbolic and satellite navigation systems. On Loran-C and Decca systems, the report shows equi-GDOP diagrams in these coverage area around Japan. Omega equi-GDOP maps of west pacific area are also shown about verious combinations of Omega stations pairs that signals can be received in this area. GDOP of satellite navigation systems are diagramed about the time length of receiving satellite signals on NNSS and about some typical satellite constallations and their variation on GPS.