The automated Loran-C coverage diagram generator

The preliminary details of an automated system developed for generating and archiving Loran-C coverage diagrams are presented. A coverage diagram is a graphical representation of the geographical area inside of which a Loran-C receiver can function within specified limits. The automated Loran-C coverage diagram (ALCDG) generator is a PC-based software system that quickly computes and displays estimated service areas for existing and proposed Loran-C chains. This system can generate a coverage diagram for a proposed chain in under ten minutes, including the time needed to enter station parameters and draw the map. The system is based on existing methods for diagram generation but has been modified to improve the speed and accuracy of the process. The ALCDG has gone through several periods of design review and testing, including extensive testing of the man-machine interface and the technical model