Gaofen-3 is the earliest civil C-ring polarimetric SAR (Artificial Aperture Radar) imaging satellite from CNSA (China National Place Government), Beijing, China. GF-3 is part of the brand new CHEOS (Asia High definition Earth Observation System) family members for the purpose to add large-quality observations and you will disaster monitoring. Their first pages will be the County Oceanic Administration (SOA), new Asia Meteorological Administration (CMA), this new Ministry out-of Civil Circumstances, additionally the Ministry from Drinking water Resources.
Sea revolution, water skin wind profession, inner trend, frontal epidermis, superficial ocean geography, water facial skin petroleum spill,ocean freeze, green wave, seaside zone and you will water body plans
Flood immersed city, dust flow, landslide, frost otherwise accumulated snow, extent out-of ocean freeze, drought scope, structures, temporaryhousing, site visitors, farming and you will home use, ton handle establishment
Properties off river basin possibilities, surface liquids shipment, ton variety, crushed dampness content, property use andvegetation exposure. Skin drinking water evidence, ponds, reservoirs (dams), canals, wetlands, glaciers, snow, otherimportant drinking water provide, irrigation elements, groundwater secluded feeling keeping track of symptoms, karst, phreatic liquid,springs, geological landforms, etc.
Spacecraft
The Sweetheart-3 satellite is dependant on the new ZY1000B program, created by the fresh Chinese Academy regarding Room Tech (CAST), and you will contains two-fold: payload and you may service system. The fresh new payload include the new SAR stream, research signal system, study indication antenna system. This service membership system brings power supply, set up, fix and you may decide to try heat, also a battery pack, emotions manage, propulsion, monitoring and you may control, studies administration, framework and you may thermal handle program.
This new Sweetheart-step three satellite is an effective about three-axis stabilized that have a launch mass around 2779 kilogram, and you can a structure longevity of 8 women Latinas decades. Brand new spacecraft have large-balances and you will high-speed feelings handle solutions through its a variety of CMGs (Control Minute Gyros) and momentum wheels. The new satellite functions in an enthusiastic orbit altitude of approximately 755 km within the a sunshine parallel orbit inside a part appearing attitude.
The satellite goes in a great about three-axis normalized ground directional manage function, the latest leading precision is better than 0.03?, the soundness is preferable to 5 x ten -4 ?/s, and contains an excellent roll maneuver capability of ±29.5?. The brand new satellite is using a dual separate bus strength setting, an effective around three-junction GaAs solar telephone assortment, an one hundred Ah NiCd power and you can a good 225 Ah lithium-ion power, can meet the brand new consult of satellite imaging standards. In the event that efficiency fuel of platform shuttle is not sufficient and/or shuttle production try unpredictable, brand new cargo high voltage power supply can be converted into good low voltage battery courtesy an excellent grid controller and be made use of on the program devices. The satellite features an autonomous wellness administration system, that carried on display screen important events, evaluate the tool condition and take numerous energetic actions ahead of time to be sure satellite security for the orbit.
Satellite Tech Provides
Multi-Polarization and you will Multi-Imaging Setting Framework: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 data is received that with polarization time section and you will a beneficial positive and negative frequency modulation hill, to be able to enhance the ambiguity away from area goals.
2) Effective phased selection antenna is employed to uncover flexible command over imaging settings and versatile altering off wave ranks. Playing with a good waveguide slot antenna, H polarization waveguide and you can V polarization waveguide are manufactured correspondingly, that may effortlessly reduce the common coupling between them antennas, improve the vent separation of one’s antenna, following increase the polarization isolation of one’s antenna.
3) The system keeps a number of LFM (Linear Frequency Modulated) signal data transfer and you can date depth combinations. The brand new several categories of imaging settings correspond to 18 types of LFM signals, with different filter systems utilized in the fresh new code road to make certain that various other data transfer indicators is actually pent-up.
