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Autonomous Space Transport Robotic Operations (ASTRO), was an American technology demonstration satellite which was operated as part of the Orbital Express program. It was used to demonstrate autonomous servicing and refuelling operations in orbit, performing tests on the NEXTSat satellite which was launched with ASTRO for that purpose. [2]
Orbital Express was a space mission managed by the United States Defense Advanced Research Projects Agency (DARPA) and a team led by engineers at NASA's Marshall Space Flight Center (MSFC). The Orbital Express program was aimed at developing "a safe and cost-effective approach to autonomously service satellites in orbit". [ 1 ]
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NEXTSat was a 224-kilogram (494 lb) spacecraft, [2] which was built by Ball Aerospace around the RS-300 satellite bus. [4] It was operated in low Earth orbit ; on 9 March 2007, it had a perigee of 490 kilometres (300 mi), an apogee of 498 kilometres (309 mi), 46.0 degrees of inclination , and an orbital period of 94.49 minutes. [ 5 ]
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The Original ASTRO 25 format utilizes APCO Project 25 Phase I technology (FDMA). It is the most used format of the ASTRO 25 family of radio systems. The ASTRO 25 Phase II system, which complies with the P25 Phase II standard, uses TDMA technology to deliver two voice channels over a single wireless trunking channel. [4]