Fig. 3. Configuration of SEEL complex. facilities combined, the capability of SEEL is extended to cover the transmis- sion/reception experiment and the excitation/monitor experiment at a long distance. The basic rules of the bus platform operation is generated in the course of its concept study. The ground rules are tentatively assumed to remain as desired from mission proposers. [1] The unmanned bus platform is launched by a single STS flight together with its payloads in the initial phase. The platform is returned to the Earth by another STS flight. [2] The platform is deployed, assembled and operated in the proximity of the space station. [31 The platform is docked with STS and berthed by OMV, but not berthed on the space station. [4] The platform receives the service from STS in case the OMV is not available. [5] The platform orbit is controlled by the space station with a support of the ground operation center. [6] The communication to and the data collection from the platform is done by the space station or directly by the ground operation center as required. The orbit and altitude requirements have to be compromised with those of the space station. The orbital elements of the space station is currently determined as an altitude of 450 km and an inclination of 28.5 deg. Therefore, the experiments of SEEL have to be performed in the co-orbiting condition with this orbit. At the present, most of the experiment can accept this condition. It is rather mandatory for SEEL mission to receive the maximum solar radiation. This is the largest constraint for SEEL missions to be operated by the space station in a low inclination angle.
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