SELENE mission: mathematical model for SST Doppler measurements

Details SELENE mission: mathematical model for SST Doppler measurements SELENE mission: mathematical model for SST Doppler measurements

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pabei..19..354p&link_type=abstract

Progress in Astronomy, Vol. 19, No. 3, p. 354 - 364 (2001)

Astronomy and Astrophysics

Astronomy

Lunar Exploration, Satellite-Satellite Tracking (Sst), Selene

Scientific paper

Japanese lunar exploration mission, SELENE, has been planned to be launched into space by using H II-a rocket in the Summer of 2004. This mission is composed of 3 subsatellites, a main lunar orbiter, a relay satellite and a free flying VLBI radio source. One of its main scientific objectives is the estimation of high order and degree spherical harmonic coefficients for the lunar gravity field. Different tracking methods will be employed in SELENE. The key tracking method is 4 way Satellite-to-Satellite Tracking (SST) technique. By this way, the tracking data can be obtained through the relay when the low altitude main orbiter is flying at the far-side of the Moon and can not be "seen" from the Earth. To success the historical tracking data, a complete coverage of Doppler tracking from an orbiter at sufficiently low altitude with high tracking accuracy can be obtained. The 4 way SST has various configurations. For SELENE, the SST tracking mode is introduced here, the mathematical relation between range rate and 4 way Doppler count number is established, and a data processing stream frame by using GEODYN II is suggested.

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