OMEGA NAVIGATION SYSTEM OPERATIONS DETAIL WASHINGTON D C
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The computer program, comprising a main program driver and 8 subroutines, together with an associated data file, is described fully in the document OMEGA Propagation Corrections Background and Computational Algorithm, ONSOD 01-74, ADA-008424. In previous years, much experimentation and theoretical study has been directed at various areas in VLF wave propagation and ionospheric modeling. The results of these investigations have been applied to various communication and navigation systems in order to improve their achievable accuracy and reliability. As applied to OMEGA Navigation System, these accuracy improvements are manifested in the form of phase, or propagation corrections which are available to all users through published tables. This program calculates PPCs at arbitrary points on the earths surface given the geographic location of these points, the geographical location of two transmitters which generate the signals, a VLF conductivity map of the earths surface, time hour, day, and month, and the geomagnetic field configuration. ...Software Description This program is written in the FORTRAN programming language for implementation on a Honeywell 6060 computer using the GCOS operating system.
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