DubaiSat-1
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 An artist rendering of DubaiSat-1 | |
| Mission type | Remote sensing |
|---|---|
| Operator | Mohammed bin Rashid Space Centre |
| COSPAR ID | 2009-041B [1] |
| SATCAT no. | 35682 [1] |
| Mission duration | 6 years and 22 days |
| Spacecraft properties | |
| Bus | SI-200 |
| Manufacturer | Satrec Initiative, South Korea |
| Launch mass | 190 kg |
| Dimensions | 1200 x 1200 mm (hexagonal) |
| Power | 330 watts |
| Start of mission | |
| Launch date | 29 July 2009, 18:46:00 UTC |
| Rocket | Dnepr |
| Launch site | Baikonur, Site 109/95 |
| Contractor | ISC Kosmotras |
| End of mission | |
| Last contact | 21 August 2015 |
| Orbital parameters | |
| Reference system | Geocentric[2] |
| Regime | Sun-Synchronous |
| Perigee altitude | 666 km |
| Apogee altitude | 681 km |
| Inclination | 98.13° |
| Period | 98.21 minutes |
| Epoch | 29 July 2009 [2] |
| Main camera | |
| Name | Dubai Medium Aperture Camera (DMAC) |
| Wavelengths | Pan: 420-720 nm MS1: 420-510 nm (blue) MS2: 510-580 nm (green) MS3: 600-720 nm (red) MS4: 760-890 nm (near infrared) |
| Resolution | 2.5 m (Pan) 5 m (MS) |
DubaiSat-1 (Arabic: دبي سات-1) is a remote sensing Earth observation satellite built by the Mohammed bin Rashid Space Centre (MBRSC) under an agreement with Satrec Initiative, a satellite manufacturing company in South Korea.[3]
DubaiSat-1 was launched on 29 July 2009 into a 680 km altitude Sun-synchronous polar orbit from the Baikonur launch site in Kazakhstan, along with several other satellites on board the Dnepr launch vehicle.[4][5][6]
DubaiSat-1 observes the earth at a Low Earth orbit (LEO) and generates high-resolution optical images at 2.5 m in panchromatic (black-and-white) and at 5 m in multispectral (colour) bands. These images provide decision makers in the UAE as well as MBRSC clients with a valuable tool for a wide range of applications including infrastructure development, urban planning, and environment monitoring and protection. DubaiSat-1 images are also useful for promoting geosciences and remote sensing research in the region, and for supporting different scientific disciplines in private and academic sectors.[7][8]
For example, DubaiSat-1 images have been used, to monitor progress on The World megaproject, Palm Islands, and the Al Maktoum International Airport.[9][10]
The United Nations also used DubaiSat-1 images to monitor relief efforts following the 2011 Tōhoku earthquake and tsunami in Japan.[11][12]
The satellite accommodates two main payloads. The primary payload is the Dubai Medium Aperture Camera (DMAC), and the secondary and experimental payload, the Space Radiation Monitor (SRM).[3]
The DMAC system is pushbroom imaging system with one panchromatic and four multi-spectral imaging channels. It also consists of an Electro-Optical Subsystem and the Payload Management Subsystem. The Electro-Optical Subsystem has a telescope, a focal plane assembly, and a Signal Processing Module. The Payload Management Subsystem consists of the Thermal and Power Module and the Mass storage and Control Module.[3]
The Space Radiation Monitor, the secondary and experimental payload, is capable of measuring the total ionizing dose from the charged particles at the orbits of satellites. The instrument utilizes four p-type Metal-Oxide-Semiconductor Field Effects Transistors (MOSFETs). These devices measure the current-voltage characteristics of the satellite. Subsequent analysis will allow measurements of the amount of cumulative ionizing dose, and of the total ionizing dose of the devices.[3]
Structure
DubaiSat-1 has a hexagonal body with three deployable solar panels. The frame includes spacecraft adaptors, six longerons, rails, an inner ring that provides rigidity and stability of the satellite's camera, inner rods and three decks. Three spacecraft adaptors connect with shear brackets and mechanically couple the satellite and separation adaptor of the launch vehicle, the Dnepr rocket. Each one of the spacecraft adaptors has separation sensors to monitor the separation condition between the satellite and the launch vehicle. The umbilical connector attaches on the lower surface of the bottom deck with its mounting support bracket.[3]
Ground Station Components
MBRSC's Ground Station is located in Dubai, and is the only ground system supporting the DubaiSat-1 mission. The ground system consists of three main subsystems:
Antenna and RF Subsystem
The Antenna and RF subsystem consists of a Viasat 11.28 metre antenna system incorporating an S-band transmitter feed, an S-band receiver feed, an X-band receiver feed, and a tracking system. The RF equipment is used to communicate with the satellite. It receives X-band RF signals and performs RF processing. It also produces a demodulated and bit-synchronized data stream from X-band signals. In general, its purpose is to transmit imaging orders and command the satellite through the S-band transmitter feed; receive information and health status from the satellite through the S-band receiver feed; and download the images through the X-band feed.[3]
Mission Control Station
From the Mission Control Station, MBRSC staff plan and operate the entire space mission, including the configuration and scheduling of resources for both space and ground elements. It also monitors and commands the satellite.[3]
Image Receiving and Processing Station
The third component of the ground system is the Image Receiving and Processing Station (IRPS). The IRPS receives and processes the X-band downlink data in real-time. This includes generation of standard image products and catalogues for integration with system management; for archive management; and for comprehensive user interface to provide easy access to satellite image data.[3]
The IRPS is located at MBRSC's ground station in Dubai. It has a direct interface with the main mission control station and it generates schedule requests which includes imaging and download schedules. It also archives image and ancillary data for product generation and distribution.[3]
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