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COSMO-SkyMed (COnstellation of small Satellites for the Mediterranean basin Observation) is an Earth observation satellite system funded by the Italian Ministry of Research and Ministry of Defence and conducted by the Italian Space Agency (ASI), intended for both military and civilian use.〔 (【引用サイトリンク】 COSMO-SkyMed: Mission definition and main applications and products )〕 The space segment of the system includes four identical medium-sized satellites equipped with synthetic aperture radar (SAR) sensors with global coverage of the planet.〔 (【引用サイトリンク】 COSMO-SkyMed )〕 Observations of an area of interest can be repeated several times a day in all-weather conditions. The imagery will be applied to defense and security assurance in Italy and other countries, seismic hazard analysis, environmental disaster monitoring, and agricultural mapping.〔 (【引用サイトリンク】 SPACEHAB Subsidiary Signs New Contracts Totaling $4.7 Million )〕 == Space segment == The four satellites are in sun-synchronous polar orbits with a 97.9° inclination at a nominal altitude of 619 km and an orbital period of 97.2 minutes. The local time ascending node at the equator is 06:00. The expected operating life of each satellite is estimated to be 5 years. Each satellite repeats the same ground track every 16 days, and all of the satellites follow the same ground track. They cross the equator at 06:00 and 18:00 local-time each day. The satellites are phased in the same orbital plane, with COSMO-SkyMed's 1, 2 and 4 at 90° to each other and COSMO-SkyMed 3 at 67.5° from COSMO-SkyMed 2. This results in varied intervals between the satellites along the same ground track of between 1 and 15 days. The sun-synchronous orbit is used to keep the solar cells illuminated at all times. The satellites' main components are: *Two solar arrays for 3.8 kW at 42 V DC *Stabilization, navigation and GPS systems *Synthetic aperture radar working in X band *300 Gbit on-board memory and 310 Mbit/s data-link with ground segments The radar antenna is a phased array that is 1.4 m wide x 5.7 m long. The system is capable of both single- and dual-polarization collection. The center frequency is 9.6 GHz with a maximum radar bandwidth of 400 MHz. 〔 (【引用サイトリンク】 COSMO-SkyMed User Guide )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「COSMO-SkyMed」の詳細全文を読む スポンサード リンク
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