Resurs-DK No.1

Resurs-DK No.1

Mission type	Earth observation
Operator	NTs OMZ
COSPAR ID	2006-021A
SATCAT №	29228
Website	eng.ntsomz.ru/ks_dzz/satellites/resurs_dk1
Mission duration	3 years (planned)[1]
Spacecraft properties
Bus	Yantar[2]
Manufacturer	TsSKB Progress
Launch mass	6,570 kilograms (14,480 lb)[1]
Dimensions	7.93 by 2.72 metres (26.0 ft × 8.9 ft)
Start of mission
Launch date	15 June 2006, 08:00 (2006-06-15UTC08Z) UTC[3]
Rocket	Soyuz-U
Launch site	Baikonur 1/5[4]
Orbital parameters
Reference system	Geocentric
Regime	Low Earth
Semi-major axis	6,941.19 kilometres (4,313.06 mi)[3]
Eccentricity	0.0007916[3]
Perigee	564 kilometres (350 mi)[3]
Apogee	575 kilometres (357 mi)[3]
Inclination	69.94 degrees[3]
Period	95.92 minutes[3]
Mean motion	15.01[3]
Epoch	25 January 2015, 04:09:41 UTC[3]
Instruments
Geoton-1, PAMELA, ARINA

Resurs-DK No.1,^[5] often incorrectly translated as Resurs-DK1 is a commercial Earth observation satellite capable of transmitting high-resolution imagery (up to 0.9 m) to the ground stations as it passes overhead. The spacecraft is operated by NTs OMZ, Russian Research Center for Earth Operative Monitoring.

The satellite is designed for multi-spectral remote sensing of the Earth's surface aimed at acquiring high-quality visible images in near real-time as well as on-line data delivery via radio link and providing a wide range of consumers with value-added processed data.

Spacecraft

The Resurs-DK spacecraft was built by the Russian space company TsSKB Progress in Samara, Russia. It is a modified version of the military reconnaissance satellite Yantar-4KS1 (Terilen).^[6] The spacecraft is three-axis stabilized. The design lifetime is no less than three years, with an expected lifetime of five years. Ground location accuracy is 100 metres (330 ft). Onboard storage is 768 gigabits. Data link speed to the ground station is 300 Mbit/s. Maximum daily productivity is 1,000,000 square kilometres (390,000 sq mi).

Resurs is Russian for "Resource". The letters DK are the initials of Dmitry Kozlov, chief designer of the first satellite of the Yantar-2K class.

Optical subsystem

• Type: apochromatic telephoto
• Focal length: 4000 mm
• Objective diameter: 500 mm
• Spectral range: 0.5-0.9 µm
• Mass: 310 kg

Made by Vavilov State Optical Institute, Russia.

Spectral Resolution

• 0.58-0.8 µm panchromatic

• 0.5-0.6 µm green
• 0.6-0.7 µm red
• 0.7-0.8 µm visible near IR (near infrared)

It is not possible to represent an image in true-color because there is no blue band (0.4 - 0.5 µm). However, it is possible to combine red, green and near IR in such way that the appearance of the displayed image resembles a visible colour photograph, i.e. vegetation in green, water in blue, soil in brown. This is not always possible because two similarly coloured objects can have completely different reactions to near IR light.

Green, red and near IR are typically combined to make a traditional false color composite where the near IR is displayed in red, the red is displayed in green, and the green is displayed in blue. This combination is favoured by scientists because near IR is useful for detection of numerous vegetation types. Vegetation appear as redtones, the brighter the red, the healthier the vegetation. Soils with no or sparse vegetation range from white (sand, salt) to greens or browns depending on moisture and organic matter content. Water appears blue, clear water is dark blue to black while shallow waters or waters with high sediment concentrations are lighter blue. Urban areas will appear blue towards gray. Clouds and snow are white.

Focal Plane Unit

Unit features 4 TDI (Time Delay and Integration) sensor arrays, one panchromatic and three multispectral. Each sensor array is composed of 36 "Kruiz" CCD chips. Effective length of the single array is about 36000 pixels. Arrays are grouped in 3 separated lines:

• near IR
• panchromatic and red
• green

This separation is causing a time delay of the colour images combined from green, red and near IR, so fast moving objects are shown in triplets. Moving object speed and direction can be calculated. All 4 arrays can work simultaneously, so it is possible to combine panchromatic and 3 multispectral images in one pansharpened color composite.

System use 10-bit ADC

Focal Plane Unit is made by NPO Opteks, Russia

CCD

The CCD "Kruiz" is a 1024 pixel x 128 line, high speed TDI sensor. The active imaging area is organized as 1024 vertical columns and 128 horizontal TDI rows.

• Pixel size: 9 x 9 µm
• Number of TDI stages electronically selectable: 128, 64, 32, 16, 8
• Two readout shift registers and two output amplifiers allowing twice faster readout
• Selftest without illumination
• Full well capacity: 120 000 electrons
• Dynamic range: 2500
• Charge transfer efficiency in any direction: more than 0.99998 per transfer
• Maximum quantum efficiency: 0.33 (at 0.72 µm).

Designed jointly by NPO Opteks and ELECTRON-OPTRONIC.
Produced by ELECTRON-OPTRONIC (now is ELAR )

Spatial resolution

Panchromatic

At the altitude of 360 km

• Nadir: 0.9 m
• 30 degrees tilt: 1.0 m

At the altitude of 604 km

• Nadir: 1.5 m
• 30 degrees tilt: 1.7 m

Multispectral

1.5–2 m

Temporal resolution

The revisit rate is 5 to 7 days off-nadir.

Swath

Swath width at the altitude of 350 km:

• 4.7 - 28.3 km (at nadir)
• 40 km (at ±30°)

ARINA

Russian research hardware for detection of high-energetic electrons and protons, their identification, detection of high-energetic particles bursts – earthquake signs.

• Mass: 9 kg

PAMELA

PAMELA Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics is an attached module built by Italian researchers with international partners. Its purpose is basic physics research of primary cosmic rays.

• Mass: 470 kg

Major Current Tasks

• Data supply for resource management and economical activity (inventory of natural resources, topographic and thematic mapping).
• Monitoring of pollution sources of the atmosphere, water and soil with the view of providing Federal and regional environmental authorities with the relevant information to make management decisions.
• On-line monitoring of man-caused and natural emergencies for the purpose of effective planning and timely performing of measures to eliminate damages.
• Supplying home and foreign consumers on a commercial basis.
• Research activities (PAMELA and ARINA experiments).

Major orbit change

The satellite was initially placed in a 355 by 573 kilometres (221 mi × 356 mi) orbit in 2006. On 10 September 2010, its orbit was circularised to 567 by 573 kilometres (352 mi × 356 mi), with an inclination of 69.9 degrees.

See also

Persona (satellite)

References

External links

• Official website
• Over 14000 images from Resurs-DK1
• 26 high resolution images from Resurs-DK1
• Gallery of images