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X-553-71-361; Goddard Space Flight Center (GSFC); Greenbelt, Maryland; April 1971. 20. E. and R. Kolenkiewicz, et al; "The Applications of Laser Tracking to the Measurement of Intersite Distance"; FPresented at the COSPAR Working Group 1]; Philadelphia, Pennsylvania; June 1976. 21. ; "Semi Dynamical Doppler Satellite Positioning"; Bedford Institute of Oceanography; Dartmouth, Nova Scotia, Canada; August 1975. 22. ; "Sbort Arc Optical Survey of the GEOS North American Tracking Network"; GSFC Document X-550-68-439; November 1968.

Chapter VII OTHER DEVELOPMENTS IN GEODESY Many pertinent developments have occurred since the last revision of this publication in February 1968. This chapter provides a place for subjects of interest that are not discussed in the other chapters. Some of the areas of new geodetic developments are: satellite laser ranging (Chapter VI), lunar laser ranging, very long baseline interferometry, satellite radar altimetry, the NAVSTAR Global Positioning System, satellite-to-satellite tracking, and inertial surveying.

For example, the pitch of a train whistle apparently changes as the train approaches and recedes from the observer. Although the sound waves travel at a constant rate-approximately 1080 feet per second at sea level-they become crowded together as the source approaches the observer, the wave lengths become shorter, and the pitch increases. The opposite effect takes place as the source moves away. In Figure 27, the radio source is assumed to be moving in a straight line at a specified speed. The angle Ø is used to indicate the distance between the position of the satellite at P (time t) and the point Pm (time tm) where it will be closest to the observer.

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