Program Requirements for Two-Minute Integrated Doppler Satellite Navigation Solution
JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB
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The report describes the algorithms used in computing a navigation fix from data provided by receivers of the two-minute integrated doppler type designed to operate with the Navy Navigation Satellite System. The theoretical basis for calculating the change in range from the navigator to the satellite as a function of the integrated satellite doppler shift data is developed. The original receiver of the integrated doppler type, the ANSRN-9, is briefly described in its developmental versions, designed by APL, and its production versions, built by ITT. The ScrippsONR 702CA receiver, built by Magnavox and used for oceanographic research applications of integrated doppler navigation, is also described. The geometrical basis of the equations for obtaining a navigation fix is developed. The formatting and processing of the receiver data for the navigation solution are described preparatory to a presentation of step- by-step procedures for computing a three-variable navigation fix. Procedures for calculating satellite alerts, using data from the navigation solution, are also described. A representative FORTRAN program for obtaining a navigation fix and for calculating alerts is presented.
- Navigation and Guidance