Gaofen-3 ‘s the earliest civil C-band polarimetric SAR (Artificial Aperture Radar) imaging satellite regarding CNSA (China National Room Management), Beijing, Asia. GF-step 3 belongs to the brand new CHEOS (China High quality World Observation Program) relatives for the purpose to include large-solution findings and you can disaster keeping track of. Their primary profiles are the Condition Oceanic Management (SOA), the latest Asia Meteorological Government (CMA), this new Ministry away from Civil Circumstances, and Ministry out-of Water Resources.
Sea revolution, water body snap industry, internal revolution, frontal body, low water topography, ocean facial skin oils spill,sea freeze, green tide, seaside area and you may ocean skin purpose
Flooding submerged area, dirt move, landslide, freeze otherwise accumulated snow, extent out of ocean ice, drought extent, buildings, temporaryhousing, subscribers, farming and residential property use, ton control business
Features away from river basin options, skin drinking water shipments, ton diversity, crushed dampness posts, belongings play with andvegetation visibility. Facial skin water indicators, lakes, reservoirs (dams), rivers, wetlands, glaciers, snow, otherimportant liquids provide, irrigation components, groundwater remote feeling overseeing indications, karst, phreatic liquids,springs, geological landforms, etcetera.
Spacecraft
The newest Gf-step 3 satellite is founded on the fresh ZY1000B platform, produced by the newest Chinese Academy of Area Tech (CAST), and you can include two-fold: payload and solution program. The new payload consists of the latest SAR load, study transmission system, investigation transmission antenna program. The service program will bring power supply, setting up, repair and take to heat, and additionally a power, feelings handle, propulsion, keeping track of and you can manage, data government, construction and you can thermal handle program.
The new Gf-3 satellite was good around three-axis stabilized that have a release size around 2779 kg, and you will a design life of 8 decades. The fresh spacecraft has actually higher-balances and you will large-agility feelings handle possibilities the help of its a mix of CMGs (Control Minute Gyros) and momentum tires. The newest satellite really works inside an orbit height around 755 kilometer inside a sunshine synchronous orbit when you look at the a part looking ideas.
The satellite enters into a great around three-axis normalized surface directional handle form, the fresh pointing reliability is better than 0.03?, the stability surpasses 5 x ten -cuatro ?/s, and has now a beneficial move maneuver capability of ±29.5?. This new satellite is utilizing a dual separate bus strength setting, a beneficial about three-junction GaAs solar cellphone selection, an one hundred Ah NiCd electric battery and you will an effective 225 Ah lithium-ion power supply, can meet this new demand of your own satellite imaging conditions. In the event the output power of your own platform bus isn’t sufficient or perhaps the bus production try unpredictable, this new cargo high-voltage power supply might be turned into an excellent low voltage electric Amerikansk Kvinner dating battery using a good grid control and start to become used towards the program gizmos. The fresh new satellite enjoys an independent fitness management system, that may continuing display critical events, measure the tool condition or take various active strategies beforehand to be certain satellite coverage inside orbit.
Satellite Technical Features
Multi-Polarization and you will Multi-Imaging Means Construction: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 date division and you will good negative and positive volume modulation slope, so as to improve ambiguity of area needs.
2) Effective phased number antenna is used to know flexible control over imaging methods and versatile altering out of revolution ranking. Playing with a great waveguide slot antenna, H polarization waveguide and you will V polarization waveguide were created respectively, that can efficiently slow down the mutual coupling between the two antennas, improve vent separation of the antenna, immediately after which improve polarization separation of your antenna.
3) The machine have various LFM (Linear Regularity Modulated) laws bandwidth and time width combinations. The fresh twelve categories of imaging modes match 18 types of LFM indicators, with assorted filters found in the fresh signal path to make sure more data transfer signals was pent up.