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Additional info for DMA Technical Report Geodesy For The Layman
Sample text
The adoption of an a-value 10 meters smaller than thaf for the WGS 66 Ellipsoid was based on several calculations and indicators including a combination of satellite and surface gravity data for position and gravitational field determinations. Sets of satellite derived station coordinates and gravimetric deflection of the vertical and geoid height data were used to determine local-togeocentric datum shifts, datum rotation parameters, a datum scale parameter and a value for the semimajor axis of the WGS Ellipsoid.
The Doppler observational system was derived from the fact that while a satellite transmitter sends a continuous unmodulated wave at a fixed frequency, the received signal at the tracking stations exhibits a shift in frequency due to the relative velocity of the satellite and observing station. A similar phenomenon may be observed with sound waves, as the source of the sound approaches and recedes from the observer. For example, the pitch of a train whistle apparently changes as the train approaches and recedes from the observer.
SECOR Orbit Revealed"; Missiles and Rockets; 24 February 1964; p. 10. 10. B. R. Newton; "The Transit System"; The Journal of the Institute of Navigation; Vol. 15, No. 2; April 1962; pp. 129-149. 11. S. Coast and Geodetic Survey; Control Leveling; Special Publication No. 226; 1941. 12. S. Coast and Geodetic Survey; Horizontal Control Data; Special Publication No. 227; 1941. 13. ; London, England; 1957. 14. ; New York, New York; 1956. 15. ; Advanced Surveying and Mapping; International Textbook Company; Scranton, Pennsylvania; 1952.