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CASEarth Satellite

 

 

Introduction

 

The CASEarth satellite, also known as the “Guangmu” earth science satellite, as an organic component of "A Project on Big Earth Data Science Engineering" dominated by the Chinese Academy of Sciences, was established in July 2018. The satellite is the first space earth science satellite in China produced by the Chinese Academy of Sciences. It is intended for refined depiction of "human traces" based on the requirements of a refined detection of "residential layout, energy consumption, and coastal environment." Apart from three optical payloads in this satellite, a ground support system and a scientific application system are constructed. This satellite can provide space observation data for "A Project on Big Earth Data Science Engineering" as well as scientific and application studies in and outside China.

 

 

 

Payloads

 

TIS

Specification

Value

Range width/

Pixel resolution@505km

300km/30m

Detection spectra /NETD

8~10.5μm/0.2K@300K

10.3~11.3μm/0.2K@300

11.5~12.5μm/0.2K@300

Dynamic range

220K~340K

Static/Dynamic MTF

≥0.1@30m (sub-satellite point)

Radiometric calibration

Absolute calibration: better than 1K@300K

Relative calibration: better than 5%

Digitalizing bit:

≥12bit

Code rateUncompressed

Peak power dissipation≤230Mbps

Average≤70Mbps

Calibration

Black body calibration in full field of view

 

GIU

Spectrum range

Panchromatic: 450nm~900nm

B:430nm~520nm

G:520 nm~615nm

R:615nm~900nm

Pixel resolution@505km

Panchromatic: 10m

RGB: 40m

SNR

city’s main road lamplight

Panchromatic&RGB

(1.0-2 W/m2/sr)≥50

City and town residential area

Panchromatic&RGB

(1.6-3 W/m2/sr)≥10

Polar moonlight

Panchromatic≥10

Code rate(Uncompressed)

<400Mbps

 

MII

Spectrum settings

B1 (deep blue 1): 380 nm-420 nm

B2 (deep blue 2): 420 nm-460 nm

B3 (blue): 460 nm-520 nm

B4 (green): 520 nm-600 nm

B5 (red): 630 nm-690 nm

B6 (red edge): 765 nm-805 nm

B7 (near-infrared): 805 nm-900 nm

Pixel resolution

10m@505km

SNR

B1≥130,B2~B6≥150

Code rate

not more than 2.4 Gbps (uncompressed, total)

 


 

Development Plan and Current Status

The satellite is now at the end of prototype phase, and transfer to flight model phase in June, 2020, and is scheduled to be launched at a proper time after May 2021. Data services will be available within half a year after the launch.

 

Feb, 2018-Dec, 2018 Feasibility demonstrate

Jan, 2019-Apr, 2019 Scheme design

Apr, 2019-Jun, 2020 Prototype phase

Jun, 2020-May, 2021 Flight model phase

Jun, 2020-Jul, 2020 Launch

Jul, 2021-Oct, 2021 In orbit test

Dec, 2021 Data services

Big Earth Data Science Engineering Program, Chinese Academy of Sciences
Address:No. 9 Dengzhuang South Road, Haidian District, Beijing, China 100094. E-mail: casearth@radi.ac.cn