Gaofen-step three is the first civilian C-band polarimetric SAR (Synthetic Aperture Radar) imaging satellite away from CNSA (China National Area Management), Beijing, China. GF-3 is part of the brand new CHEOS (China High definition Environment Observation System) friends with the objective to add high-quality observations and you can crisis keeping track of. The primary profiles are definitely the County Oceanic Administration (SOA), the fresh new China Meteorological Management (CMA), the brand new Ministry regarding Municipal Circumstances, as well as the Ministry off Drinking water Resources.
Ocean trend, ocean surface cinch field, interior trend, front facial skin, low water geography, sea surface oils spill,ocean ice, environmentally friendly tide, coastal area and you may ocean skin needs
Ton submerged area, dust move, landslide, ice otherwise snow, the amount of sea freeze, drought extent, structures, temporaryhousing, visitors, farming and you can homes play with, flooding control kissbrides.com use this link organization
Properties away from river basin assistance, skin liquid delivery, flooding variety, crushed moisture stuff, home have fun with andvegetation publicity. Epidermis drinking water symptoms, ponds, reservoirs (dams), streams, wetlands, glaciers, snow, otherimportant water sources, irrigation section, groundwater remote feeling monitoring symptoms, karst, phreatic liquids,springs, geological landforms, etc.
Spacecraft
Brand new Girl-step 3 satellite is based on the latest ZY1000B platform, created by the latest Chinese Academy off Room Technology (CAST), and you will includes two fold: payload and you can service program. The latest payload includes brand new SAR stream, research sign program, study indication antenna program. The service program provides battery, installment, fix and shot temperature, and additionally a power, thoughts handle, propulsion, keeping track of and control, data administration, design and you can thermal handle program.
The fresh Gf-step three satellite was a beneficial around three-axis normalized having a production size around 2779 kg, and you will a design life of 8 many years. The spacecraft has actually large-stability and highest-speed feelings manage options with their a variety of CMGs (Control Second Gyros) and energy wheels. The newest satellite works within the an orbit altitude around 755 kilometer for the a sunlight parallel orbit within the a side searching emotions.
The fresh satellite gets into good about three-axis stabilized soil directional control means, the fresh new directing precision surpasses 0.03?, the soundness is preferable to 5 x 10 -cuatro ?/s, and has a good move steer capability of ±30.5?. The satellite is utilizing a twin independent bus fuel setup, a beneficial around three-junction GaAs solar power cell range, a hundred Ah NiCd battery and good 225 Ah lithium-ion power, can meet new demand of your own satellite imaging criteria. In the event the yields stamina of system shuttle isn’t enough or the shuttle returns is abnormal, the new cargo high voltage battery pack can be converted into good low-voltage battery pack through good grid operator and stay made use of into the platform equipment. This new satellite keeps an independent fitness administration program, which can continuing monitor vital events, measure the unit status or take various energetic methods beforehand to make certain satellite safety within the orbit.
Satellite Technology Has
Multi-Polarization and you will Multi-Imaging Mode Structure:The GF-3 satellite has 12 imaging modes, including spotlight, stripmap and scan, with four polarization capability. In order to realize multi-polarization and multi-imaging modes, the following design ideas were adopted:
1) Multi-polarization information is gotten that with polarization go out office and you will a great positive and negative regularity modulation mountain, to boost the ambiguity of area purpose.
2) Effective phased variety antenna is used to locate versatile control over imaging modes and flexible modifying of revolution ranks. Having fun with a beneficial waveguide slot antenna, H polarization waveguide and you will V polarization waveguide are built correspondingly, which can effortlessly slow down the mutual coupling between them antennas, help the vent separation of antenna, and then help the polarization separation of antenna.
3) The system features a number of LFM (Linear Volume Modulated) signal bandwidth and you can go out width combinations. The newest 12 categories of imaging settings correspond to 18 kinds of LFM signals, with various strain utilized in the newest laws path to make sure different data transfer indicators is actually pent-up.
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