Statistics – Applications
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ptti.meet..253k&link_type=abstract
In its The 22nd Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting p 253-268 (SEE N91-25755 17-70)
Statistics
Applications
Deep Space Network, Oscillators, Radio Signals, Remote Sensing, Space Probes, Telecommunication, Temporal Distribution, Atmospheric Temperature, Gravitational Waves, Microwaves, Occultation, Planetary Atmospheres, Planetary Rings, Very Low Frequencies
Scientific paper
The microwave telecommunication links between the earth and deep space probes have long been used to conduct radio science experiments which take advantage of the phase coherency and stability of these links. These experiments measure changes in the phase delay of the signals to infer electrical, magnetic and gravitational properties of the solar system environment and beyond through which the spacecraft and radio signals pass. The precision oscillators, from which the phase of the microwave signals are derived, play a key role in the stability of these links and therefore the sensitivity of these measurements. These experiments have become a driving force behind recent and future improvements in the Deep Space Network and spacecraft oscillators and frequency and time distribution systems. Three such experiments which are key to these improvements are briefly discussed and relationship between their sensitivity and the signal phase stability is described. The first is the remote sensing of planetary atmospheres by occultation in which the radio signal passes through the atmosphere and is refracted causing the signal pathlength to change from which the pressure and the temperature of the atmosphere can be derived. The second experiment is determination of the opacity of planetary rings by passage of the radio signals through the rings. The third experiment is the research for very low frequency gravitational radiation. The fractional frequency variation of the signal is comparable to the spatial strain amplitude the system is capable of detecting. A summary of past results and future possibilities for these experiments are presented.
Kursinski Robert E.
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