NASA NTRS · 19780003604
National geodetic satellite program, part 1
Abstract
The Applied Physics Laboratory (APL) space research program was directed toward modeling the gravitational field of the earth from an analysis of the Doppler shifts on the transmitted frequencies of the satellites as obtained by the tracking stations. Emphasis is on the satellites involved and the methods used in accomplishing this aim.
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Dunnell, C. A., Ferriter, P., Gebel, G., Hopfield, H. S., Schaefer, M. M., Yionoulis, S. M.. 1977-01-01. National geodetic satellite program, part 1. https://ntrs.nasa.gov/citations/19780003604
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