Gaofen-step 3 is the basic civil C-band polarimetric SAR (Synthetic Aperture Radar) imaging satellite of CNSA (Asia National Space Government), Beijing, China. GF-3 falls under the newest CHEOS (China High resolution World Observation Program) friends with the objective to include large-quality findings and you can emergency keeping track of. The first users may be the State Oceanic Management (SOA), the latest China Meteorological Administration (CMA), the newest Ministry out-of Municipal Activities, in addition to Ministry out-of Water Information.
Ocean trend, water surface cinch career, inner trend, front epidermis, superficial ocean geography, water surface petroleum spill,ocean frost, green tide, seaside region and you may water skin objectives
Ton immersed area, particles move, landslide, freeze or accumulated snow, the amount away from ocean ice, drought extent, buildings, temporaryhousing, site visitors, agricultural and property use, flood control place
Characteristics regarding lake basin possibilities, skin water distribution, ton diversity, crushed moisture articles, property play with andvegetation publicity. Skin water indicators, ponds, reservoirs (dams), rivers, wetlands, glaciers, snow, otherimportant water supplies, irrigation portion, groundwater remote feeling monitoring symptoms, karst, phreatic drinking water,springs, geological landforms, etcetera.
The new Sweetheart-3 satellite is dependent on the newest ZY1000B system, produced by new Chinese Academy of Area Tech (CAST), and contains two-fold: payload and you will service system. The brand new cargo include the fresh new SAR weight, investigation indication system, research transmission antenna system. The service program will bring power, set up, fix and you will sample temperature, and additionally a battery pack, thoughts manage, propulsion, monitoring and you will handle, investigation government, build and thermal manage program.
The brand new Girlfriend-3 satellite are a about three-axis stabilized that have a production size of about 2779 kg, and you will a design longevity of 8 age. Brand new spacecraft enjoys high-balances and higher-speed thoughts control systems with the a combination of CMGs (Manage Second Gyros) and you will impetus rims. The newest satellite performs within the a keen orbit height of around 755 km from inside the a sun synchronous orbit from inside the a side appearing attitude.
The satellite enters into an excellent three-axis normalized surface directional manage mode, the pointing precision is better than 0.03?, the stability is superior to 5 x ten -4 ?/s, and has an excellent roll control capability of ±31.5?. New satellite is utilizing a twin separate shuttle energy setting, an excellent three-junction GaAs solar phone number, a 100 Ah NiCd electric battery and a beneficial 225 Ah lithium-ion battery, can meet the latest request of satellite imaging standards. If production strength of the program bus is not adequate or perhaps the coach yields is irregular, the latest payload high voltage battery is going to Sexy Tsjetsjenia kvinner be converted into a low-voltage electric battery thanks to good grid control and become put for the program gizmos. The fresh satellite keeps an independent health administration program, that can carried on display vital occurrences, measure the equipment condition and take a number of effective procedures ahead of time to be sure satellite cover inside orbit.
Satellite Technology Features
Multi-Polarization and you can Multiple-Imaging Setting Build: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 obtained that with polarization time department and you will a great negative and positive frequency modulation hill, in order to improve ambiguity away from part plans.
2) Active phased range antenna is used to discover versatile command over imaging methods and flexible switching off trend ranking. Playing with a beneficial waveguide position antenna, H polarization waveguide and V polarization waveguide are available respectively, that can effectively reduce the mutual coupling among them antennas, increase the port isolation of antenna, after which boost the polarization separation of antenna.
3) The machine features some LFM (Linear Volume Modulated) signal data transfer and you can big date thickness combinations. The twelve categories of imaging modes match 18 categories of LFM signals, with assorted filters utilized in the fresh code path to guarantee that more bandwidth indicators is suppressed.