Gaofen-step three ‘s the earliest civilian C-band polarimetric SAR (Artificial Aperture Radar) imaging satellite regarding CNSA (Asia Federal Area Administration), Beijing, Asia. GF-step three belongs to brand new CHEOS (China High res Earth Observance Program) members of the family for the purpose to incorporate higher-resolution observations and you can disaster keeping track of. The primary profiles could be the Condition Oceanic Administration (SOA), this new Asia Meteorological Government (CMA), this new Ministry out of Civil Things, and Ministry regarding H2o Tips.
Sea wave, water surface wind industry, inner wave, frontal surface, shallow ocean topography, sea surface oil pour,sea ice, eco-friendly tide, coastal region and you will sea body plans
Flooding immersed city, dirt circulate, landslide, frost otherwise accumulated snow, extent out-of sea ice, drought scope, houses, temporaryhousing, traffic, farming and you may home fool around with, ton manage facilities
Features from lake basin assistance, body drinking water shipping, flooding variety, surface wetness posts, land have fun with andvegetation exposure. Body h2o signs, ponds, reservoirs (dams), streams, wetlands, glaciers, snow, otherimportant water provide, irrigation elements, groundwater remote sensing overseeing symptoms, karst, phreatic liquid,springs, geological landforms, etc.
Spacecraft
The brand new Sweetheart-step 3 satellite lies in this new ZY1000B system, produced by the new Chinese Academy of Place Technical (CAST), and you can contains two-fold: payload and solution system. This new payload includes the fresh SAR stream, studies transmission program, research sign antenna system. The service program will bring battery, set up, maintenance and you will take to heat, plus an electric battery, attitude manage, propulsion, overseeing and you may handle, investigation government, construction and you will thermal handle system.
The fresh new Gf-step three satellite was an effective about three-axis normalized which have a production size of approximately 2779 kg, and you can a pattern lifetime of 8 age. The new spacecraft features highest-balances and you can higher-agility thoughts handle possibilities with the a mixture of CMGs (Manage Moment Gyros) and you may impetus wheels. The newest satellite functions during the an enthusiastic orbit height of approximately 755 kilometer during the a sunlight synchronous orbit inside a side looking ideas.
This new satellite gets into an excellent three-axis normalized soil directional handle means, the new directing accuracy is superior to 0.03?, the stability surpasses 5 x 10 -cuatro ?/s, and has now a great move control convenience of ±29.5?. The new satellite is using a dual separate coach electricity arrangement, good about three-junction GaAs solar mobile range, a hundred Ah NiCd electric battery and an excellent 225 Ah lithium-ion power supply, will meet the brand new demand of the satellite imaging criteria. When the production strength of your own Oslo hottest girls system bus isn’t enough or even the coach yields is unpredictable, the newest payload high voltage battery are going to be turned into an excellent low voltage power supply as a result of a good grid controller and become utilized to your program gadgets. This new satellite enjoys an autonomous fitness management program, that can proceeded display important situations, gauge the unit condition or take numerous effective strategies in advance to make sure satellite defense in orbit.
Satellite Tech Has
Multi-Polarization and Multi-Imaging Function 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 info is acquired by using polarization big date section and you will good positive and negative volume modulation slope, to be able to enhance the ambiguity away from section aim.
2) Energetic phased variety antenna is utilized to discover versatile control over imaging settings and flexible switching out of revolution positions. Using a great waveguide slot antenna, H polarization waveguide and V polarization waveguide are formulated correspondingly, that will efficiently slow down the common coupling between the two antennas, increase the vent separation of your antenna, following enhance the polarization isolation of antenna.
3) The computer provides several LFM (Linear Volume Modulated) signal data transfer and go out depth combinations. The newest 12 kinds of imaging modes match 18 kinds of LFM indicators, with different filter systems included in this new laws path to make certain different bandwidth indicators try pent up.