Abstract
A feasibility analysis points up the fact that, although the overall Doppler shift of a signal originating from a beacon on the moon is quite significant, the portion of the shift which is sensitive to the selenographic latitude and longitude of the beacon is much smaller. In fact, the basic transmitter frequency would have to be held constant (including noise) to one part in 10 for even marginal performance of the beacon location system. The feasibility analysis also shows, qualitatively, that there exist optimum times of the month for most accurately determining the selenographic coordinates of a beacon. The detailed formalism for a differential correction procedure is given in which the first-estimate values of the beacon coordinates are obtained, e.g., from the trajectory ephemeris of the vehicle setting the beacon upon the moon.
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