Kompsat-3

Kompsat-3

KOMPSAT-3 Satellite Sensor (0.7m)

KOMPSAT-3 (Arirang-3) spacecraft was successfully launched on May 17, 2012 (16:39 UTC) from the Tanegashima Space Center of JAXA, Japan on the H-IIA launch system. Launch provider: Mitsubishi Heavy Industries, Ltd.

KOMPSAT-3 is an optical high-resolution Korean observation mission of KARI (Korea Aerospace Research Institute). The project was started in 2004. The objective is to provide observation continuity from the KOMPSAT-1 and KOMPSAT-2 missions to meet the nation's needs for high-resolution optical imagery required for GIS (Geographical Information Systems) and other environmental, agricultural and oceanographic monitoring applications.

The KOMPSAT-3 is 3-axis stabilized. The agile spacecraft features a body pointing capability of ±45o into any direction (cross-track or along-track). This satellite agility permits event monitoring as well as single-pass stereoscopic observations

KOMPSAT-3 can provide sub-meter images with various imaging modes. It will continue to provide sub-meter imagery to domestic and international users for the applications of public safety, resource management, environmental monitoring, location-based services, intelligence and disaster monitoring.

Spectral bands

450-900 nm Pan (Panchromatic)
450-520 nm MS1 (Multispectral), blue
520-600 nm MS2, green
630-690 nm MS3, red
760-900 nm MS4, NIR (Near Infrared)

Optics

- Korsch-type telescope design on a CFRP optical bench
- 80 cm diameter of primary mirror aperture (the mirror is lightweighted)
- All mirrors (5) are of Zerodur design
- Focal length = 8.6 m
- F number = f/12

GSD (Ground Sample Distance)

- 0.7 m for Pan band at nadir
- 2.8 m for MS bands at nadir

Swath width

15 km (at nadir)

Tilt angle

Roll: ±45o, pitch: ±30o

Location accuracy

< 48.5 m CE90

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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