Gaofen-step three ‘s the first civilian C-ring polarimetric SAR (Synthetic Aperture Radar) imaging satellite out of CNSA (China National Room Government), Beijing, Asia. GF-step three is part of the CHEOS (Asia High Kvinner Ungarsk definition Planet Observance System) family members with the aim to incorporate high-quality findings and crisis monitoring. Their primary pages will be County Oceanic Government (SOA), the fresh China Meteorological Management (CMA), the new Ministry from Municipal Affairs, additionally the Ministry away from Liquid Tips.
Sea trend, water surface piece of cake community, inner wave, frontal epidermis, low water topography, sea body petroleum pour,sea freeze, green tide, seaside region and you will water skin purpose
Ton submerged town, dirt circulate, landslide, freeze or snowfall, the amount off water ice, drought range, structures, temporaryhousing, guests, farming and you can home have fun with, flood control place
Functions regarding river basin assistance, epidermis drinking water shipments, flood variety, crushed dampness content, property use andvegetation exposure. Epidermis liquids symptoms, lakes, reservoirs (dams), rivers, wetlands, glaciers, snowfall, otherimportant liquids provide, irrigation elements, groundwater secluded feeling overseeing signs, karst, phreatic h2o,springs, geological landforms, etc.
Spacecraft
This new Sweetheart-step 3 satellite is dependent on the new ZY1000B program, produced by the newest Chinese Academy out-of Space Technical (CAST), and contains two parts: payload and service program. The latest payload consists of brand new SAR stream, study sign system, analysis transmission antenna program. This service membership program provides power, installment, restoration and you may test temperature, including a battery pack, feelings control, propulsion, monitoring and you may control, studies management, design and you will thermal control program.
Brand new Girl-step 3 satellite try good about three-axis stabilized with a production size of about 2779 kilogram, and you can a routine longevity of 8 age. The brand new spacecraft keeps large-stability and highest-agility emotions manage possibilities making use of their a mixture of CMGs (Control Second Gyros) and momentum tires. The fresh satellite really works during the an orbit height of around 755 kilometres for the a sunshine synchronous orbit into the a part looking emotions.
Brand new satellite enters into good around three-axis stabilized floor directional handle form, the new pointing reliability is preferable to 0.03?, the stability is superior to 5 x ten -cuatro ?/s, and it has a beneficial roll maneuver convenience of ±31.5?. The newest satellite is using a twin separate shuttle fuel configuration, a good about three-junction GaAs solar cell array, an one hundred Ah NiCd power and a good 225 Ah lithium-ion power, will meet the fresh new demand of satellite imaging conditions. In the event that output fuel of program shuttle is not sufficient and/or shuttle output is actually abnormal, the fresh new payload high voltage battery will be converted into a good low voltage battery pack as a consequence of an effective grid control and become used for the system gadgets. This new satellite provides an independent health management program, that continuous display screen vital occurrences, measure the unit status and take a variety of active procedures beforehand to make certain satellite cover during the orbit.
Satellite Tech Keeps
Multi-Polarization and Multiple-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 info is gotten that with polarization go out office and you may an excellent positive and negative frequency modulation slope, so as to enhance the ambiguity away from section needs.
2) Active phased number antenna can be used to locate flexible control over imaging settings and flexible modifying from wave ranks. Playing with a good waveguide slot antenna, H polarization waveguide and you may V polarization waveguide are made correspondingly, which can effectively slow down the shared coupling between the two antennas, help the vent separation of your own antenna, immediately after which improve polarization isolation of your own antenna.
3) The machine keeps numerous LFM (Linear Volume Modulated) code bandwidth and you may time width combinations. The newest twelve categories of imaging methods correspond to 18 categories of LFM signals, with various filter systems used in the fresh rule road to guarantee that additional data transfer signals try stored.
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