Actual Operation Simulation of RESSOX Ground Experiments
NATIONAL INST OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY TSUKUBA (JAPAN)
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The first quasi-zenith satellite QZS of Japan, named Michibik, was launched on 11 September 2010. After 3 months of initial functional verification tests, the actual operation will start. We have planned three kinds of experiments using Michibiki 1 experiments without voltage-controlled oven-compensated controlled crystal oscillator VCOCXO control of Experiment One, 2 experiments with VCOCXO control of Experiment One, and 3 experiments with VCOCXO control of Experiment Two. In Experiment One, the remote synchronization system of the onboard crystal oscillator RESSOX control signal that includes information of the standard time will be sent from ground stations, and the onboard crystal oscillator of Michibiki will be controlled to synchronize the arrival of the RESSOX control signal. The RESSOX control signal is similar to such time calibration signals as WWV or JJY, but the delay is compensated. In Experiment Two, on the basis of the results of a time comparison experiment between the onboard crystal oscillator and the ground standard time conducted by the National Institute of Information and Communications Technology NICT, the voltage applied to the onboard crystal oscillator will be calculated at the ground station and transmitted to Michibiki to control the crystal oscillator. The effects of some data and command delays on control quality and performance in an actual operation are considered as well.
- Navigation and Guidance
- Unmanned Spacecraft