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Instrument: SSTI : Satellite-to-Satellite Tracking Instrument
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[Source: ESA's Gravity Mission GOCE Brochure, ]

The Satellite-to-Satellite Tracking Instrument (SSTI) consists of
an advanced dual-frequency, 12-channel GPS receiver and an
L-band antenna. The SSTI receiver is capable of simultaneously
acquiring signals broadcast from up to 12 spacecraft in the GPS
constellation. The SSTI instrument delivers, at 1Hz, so-called
pseudo-range and carrier-phase measurements on both GPS
frequencies, as well as a real-time orbit navigation solution.

Online Resources

Instrument Logistics
Instrument Start Date: 2009-03-20
Instrument Owner: ESA