DRAGONSat (Dual RF Astrodynamic GPS Orbital Navigator Satellite) is a pair of nanosatellites that will be demonstrating autonomous rendezvous and docking (ARD) in low Earth orbit (LEO) for NASA. It will be gathering flight data with a global positioning system (GPS) receiver strictly designed for space applications to gather flight data in the space environment. ARD is the capability of two independent spacecraft to rendezvous in orbit and dock without crew intervention. One DRAGONSat was built by the University of Texas and the other one was built by Texas A and M University, the Space Shuttle Payload Launcher (SSPL), These satellite projects will rendezvous and dock with each other in space without the benefit of human intervention.

DRAGONSat

DRAGONSat as photographed after its release from Space Shuttle Endeavour's payload bay
COSPAR ID	2009-038B
Start of mission
Launch date	July 30, 2009 (UTC) (2009-07-30Z)
Rocket	Space Shuttle Endeavour
Launch site	Kennedy LC-39A
End of mission
Disposal	Failed to separate from companion
Orbital parameters
Reference system	geocentric
Regime	LEO
Inclination	51.7°

DRAGONSat is planned to be an eight-year program with a launch of the satellites approximately every two years. The first three missions will test individual components and subsystems while the final mission will culminate with the successful docking of two satellites. Each mission builds upon the previous mission culminating in a fully autonomous rendezvous and docking mission. Both universities are required to use GPS receivers designed by NASA in order to determine its functionality. One of the objectives is to demonstrate precision real-time navigation capability as well as precision relative navigation between the two satellites. [1]

Operations

DRAGONSat is a pair of two 5 inches x 5 inches x 5 inches satellites which are launched from the Shuttle orbiter payload bay. Both satellites are built of aluminum with a mass of approximately 7.5 kg. Each picosatellite is covered with photo-voltaic cells and will enable a longer active life in orbit. Each satellite also has a dipole antenna and two antennas for the GPS receiver. The satellites are ejected from the SSPL which is located on the payload bay sidewall.

Protocols

Both DRAGONSat are launched together in the Space Shuttle Payload Launcher (SSPL) from the side walls of the orbiter payload bay. They are ejected as a pair and once they are at a safe distance from the Space Shuttle, they will separate and begin the experiment. Data collection will be downlinked to ground stations for as long as the satellites are able to transmit.

Specifications

Section source'[2]

DRAGONSat-1 "BEVO-1"

• Country: USA
• Application: Spacecraft docking technology
• Operator: University of Texas at Austin
• Contractors: University of Texas at Austin
• Equipment: DRAGON GPS Receiver
• Configuration: 5" cube
• Propulsion: none
• Lifetime: 3.5 kg
• Mass: 5 kg

DRAGONSat-2 "AggieSat-2"

• Country: USA
• Application: Spacecraft docking technology
• Operator: Texas A&M University
• Contractors: Texas A&M University
• Equipment: DRAGON GPS Receiver
• Configuration: 5" cube
• Propulsion: None
• Lifetime: 3.5 kg
• Mass: 3.5 kg

Launches

• STS-127 Shuttle

On July 30, 2009 STS-127 Flight Day 16 the first pair of DRAGONSats were inserted into orbit. Space Shuttle Endeavour placed them in orbit at 8:35 am EDT. for their multiyear mission to study automatic dockings in space. Deployment occurred over central South America at an altitude of 218 miles.[3]

See also

• CubeSat
• PicoSAT

References

External links

• Gunters Space Page: AggieSat 2 (DRAGONSat 2)

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