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Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009fsm..conf...62t&link_type=abstract
FREQUENCY STANDARDS AND METROLOGY. Proceedings of the 7th Symposium. Held 5-11 October 2008 in Asilomar Conference Grounds, Paci
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Doppler Tracking, Space-Qualified Atomic Clocks, Radio Science Experiments
Scientific paper
We are witnessing the beginning of a new era for space-qualified atomic clocks. These new instruments, characterized by low-mass, low-power consumption, and frequency stabilities comparable to those of ground-based clocks, will allow interplanetary spacecraft radio science experiments at unprecedented Doppler sensitivities.
By adding a digital receiver to the onboard instrumentation, it is possible to take advantage of the frequency stability of a space-qualified atomic clock by linearly combining digitally the multi-link Doppler measurements performed on the ground and onboard. This allows one to optimally suppress the frequency fluctuations of the Earth atmosphere, ionosphere and mechanical vibrations of the ground antenna (the dominant Doppler tracking noises) in the resulting Doppler data set.
After providing the general expression of the optimal combination of the ground and onboard Doppler data, we apply it, as an example, to interplanetary Doppler tracking searches for gravitational radiation. The resulting estimated sensitivity to milliHertz gravitational waves is about one order of magnitude better than that achievable by traditional two-way coherent Doppler experiments.
The Doppler tracking technique discussed in this article can be performed (at minimal additional cost) with future planned interplanetary missions, and extended to other experiments such as spacecraft Doppler tests of relativistic gravity, gravity field measurements, and radio occultations of planetary atmospheres and rings.
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