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KOMPSAT-3A

KOMPSAT-3A

KOMPSAT-3A Satellite Sensor (0.55m)

The KOMPSAT-3A spacecraft was launched on March 25, 2015 (22:08:53 UTC) on a Dnepr-1 vehicle from the Jasny Dombarovsky launch site in Russia. The launch provider was ISC (International Space Company) Kosmotras and will become commercially available during the summer of 2015.

Kompsat-3A will be a sister spacecraft to the previously launched Kompsat-3 (Arirang-3), both of which were developed by the Korea Aerospace Research Institute (KARI).

The major goal of the KOMPSAT-3A program is to develop an earth observation satellite to obtain IR (Infrared) and high resolution EO (Electro-Optical) images for a variety of applications such as Geographical Information Systems (GIS), and environmental, agricultural and oceanographic monitoring as well as urban planning, resource management and disaster relief. KOMPSAT-3A will provide panchromatic resolution of 0.55m and multispectral resolution of 2.20m and also has an infrared sensor at 5.5m resolution.

KOMPSAT-3A is equipped with two imaging payloads; the Advanced Earth Imaging Sensor System A (AEISS-A) and an Infrared Imaging Payload. AEISS-A is similar to that of the KOMPSAT-3 spacecraft and was developed by KARI with technical support from Astrium Defence and Space and the German Aerospace Center that developed the Focal Plane Assembly and main Camera Electronics Unit.

KOMPSAT-3A Satellite Sensor Specifications

Spectral bands

PAN: 450-900 µm
MS1 (Blue): 450-520 µm
MS2 (Green): 520-600 µm
MS3 (Red): 630-690 µm
MS4 (NIR): 760-900 µm
MWIR: 3.3 - 5.2 µm

Optics

- Korsch-type telescope design on a CFRP optical bench
- 80 cm diameter of primary mirror aperture (the mirrors are lightweighted)
- All mirrors (5) are of Zerodur design
- Focal length = 8.6 m
- F number = f/11.5

GSD (Ground Sample Distance)

PAN: 0.55m at nadir
MS: 2.2m at nadir
IR: 5.5 m at nadir

Swath width

12 km (at nadir)

Pan CCD detector module

- Line array of 24,000 pixels consisting of 2 stacks of 12 k pixels each
- TDI (Time Delay Integration), up to 64 TDI in 4 stages
- Pixel pitch = 8.75 µm
- Source data rate = 16 x 15 Mpixel/s (or 3.84 Gbit/s)

MS CCD detector module

- Line array of 6,000 pixels, provision of 8 stacks, TDI capability
- Pixel pitch = 2 x 17.5 µm
- Binning of MS pixels (MS pixels are 4 times longer than Pan pixels)
- Source data rate = 4 x 240 Mbit/s

Antiblooming

Yes

PRNU (Photo Response Non-Uniformity)

Yes

DSNU (Dark Signal Non-Uniformity)

Yes

SNR (Signal-to-Noise Ratio)

> 100 for Pan and MS

Data quantization

14 bit

Data compression

CCSDS 120.1-G-1E

Payload data memory

512 Gbit

Data rate

1 GB/s

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