Released during the , Gaofen-step 3 is the third satellite about China High-Solution World Observation System (CHEOS) series
Created by the Asia Federal Place Government (CNSA), it’s a civilian satellite that have no. 1 users as the County Oceanic Management (SOA), the new China Meteorological Administration (CMA), the latest Ministry off Civil Circumstances together with Ministry off Drinking water Info.
Purpose Opportunities
Gaofen-3’s top objective should be to present an initial decimal effect to possess wetland class, but features wide apps from inside the emergency keeping track of, drinking water conservancy, maritime and you can meteorology. This new cumulative goal of this new CHEOS collection will be to offer NRT (Near-Real-Time) findings for emergency prevention and you will rescue, weather change monitoring, geographical mapping, environment and you will investment surveying, and farming support.
Wetlands have become a key aim of ecosystem overseeing to your testing out of funding creativity and also the fix away from local ecological surroundings. This new C-band Man-made Aperture Radar (C-SAR) on-board Gaofen-step 3 features high capability inside the wetland keeping track of and you may observance inside the high spatial resolution not as much as most of the-weather. The latest means are quad-polarised to include significantly more scattering facts to satisfy the new demand out-of okay wetland keeping track of. They notices during the several methods, per having differing spatial resolution and swath widths, in order to satisfy the brand new multi-affiliate technology conditions.
Performance Requirement
The fresh new C-band Artificial Aperture Radar (C-SAR) has a dozen imaging settings from the C-band frequency and that is categorized on the half dozen groups. New only one P mode employs dropping spotlight technical playing with solitary polarisation to achieve a nominal spatial quality of 1 meters and you can a beneficial swath regarding ten x ten kilometer. The latest ultra-okay (UF) stripmap setting together with spends unmarried polarisation, and also an excellent spatial quality out-of step 3 meters which have an excellent swath depth off 31 km. You’ll find four settings one obtain dual-polarisation dimensions with the stripmap approach: Great Stripmap, Broad Good Stripmap, Standard Stripmap and two Prolonged chance direction (E) settings. Okay Stripmap gets the most useful spatial quality ones at 5 meters, which have a great Jeg tenkte pГҐ dette swath depth regarding 50 m. The newest Large Good Stripmap function keeps a good spatial resolution out-of 10 meters with an excellent swath thickness out of one hundred kilometer, although the Practical Stripmap enjoys a 25 meters resolution and you will 130 km swath depth. The new Age settings have a frequency perspective of scale away from most other settings to build observing functionality and reduce review period date. Each of these have a spatial solution out-of twenty-five meters having varying swath widths of 80 km and you can 130 kilometer.
The new quad-polarisation Stripmap settings become a great Quad-pol stripmap means (Q) which have 8 meters spatial quality and you can 30 kilometer swath thickness, and you may a wide quad-pol stripmap mode (WQ) which have twenty-five yards spatial solution and you will 40 km swath width. The latest Wave setting in addition to spends quad-polarisation in discontinuous operation having accurate (10 meters) resolution over a 5 x 5 kilometer area. There are two ScanSAR settings which can be regularly security an effective huge swath thickness having twin polarisation. The fresh new Thin ScanSAR setting enjoys an effective spatial resolution out-of fifty meters and a great swath thickness regarding three hundred km, whilst the Wider ScanSAR has good spatial resolution out-of a hundred meters and you will a swath depth regarding five hundred km.
Space and you may Methods Components
Gaofen-step 3, created by the Chinese Academy from Space Tech (CAST), is based on the newest ZY1000B satellite shuttle and you will consists of a few parts: payload and you may services program. The latest payload contains the latest SAR means, research transmission system and also the research alert antenna system, due to the fact service system will bring power, setting up, maintenance and attempt temperatures. New SAR antenna was put into four panels that’s pushed by themselves to meet up with the required antenna aperture dimensions for each and every of your own observing modes. The spacecraft are about three-axis stabilised with a production mass off 2279 kilogram. Meet up with this new consult out-of imaging requirements, the latest satellite uses a twin separate coach energy setting, a three-junction solar phone selection and two batteries. Additionally employs handle moment gyroscopes (CMGs) and you will momentum rims to compliment new higher-balance and you will higher-agility handle assistance. Gaofen-step 3 has an independent health management program which enables continuous keeping track of of important events, review off device standing, and you will providing cutting-edge procedures to be certain satellite defense for the orbit.