By adapting passive ranging capability to existing LORAN-C navigational equipment, the operating area of a vessel in which the vessel's position can be precisely determined has been extended by more than 65 per cent. Within the normal operating areasa of LORAN stations, the system uses conventional hyperbolic lines of position (LOP's) to obtain the ship position. Outside these areas, passive ranging to any two LORAN stations provides two straight lines of position. In the passive ranging mode, a highly stable internal oscillator is matched in phase with the shore station at a point where the ship's position is accurately known. Thereafter, any phase difference between the transmitted signal received by the ship and the shipboard oscillator is a measure of the ship's movement.
A Passive Ranging System for Marine Navigation
Ein passives System grosser Reichweite fuer Schiffsnavigation
Western Electric Engineer ; 16 , 4 ; 2-7
1972
5 Seiten, 8 Bilder, 1 Tabelle
Article (Journal)
English
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