A report proposes a method to increase the accuracy of Doppler measurements made at the beginnings and endings of Earth/spacecraft radio occultations. Such measurements can reveal structural details of occulting objects in outer space. Heretofore, one-way measurements have been used, and have been subject to degradation of accuracy by frequency fluctuations of an onboard oscillator.

This work was done by Massimo Tinto of Caltech for NASA's Jet Propulsion Laboratory. To obtain a copy of the report, "Spacecraft radio occultations using multiple Doppler readouts," access the Technical Support Package (TSP) free on-line at www.nasatech.com/tsp  under the Physical Sciences category.

NPO-30216


This Brief includes a Technical Support Package (TSP).
Uplink/Downlink Spacecraft Radio Occultation Measurements

(reference NPO-30216) is currently available for download from the TSP library.

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This article first appeared in the December, 2001 issue of NASA Tech Briefs Magazine.

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