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STEP 2 (SIDEX, P91-2)


STEP 2 (Space Test Experiment Platform 2) was an experimental satellite launched for the Space Test Program (STP).

It was a US Air Force satellite that met the need for a standardized space platform specifically tailored to host Space Test Program experiments. These advanced research and development experiments were generally small, relatively fast-turnaround, and best suited to modestly sized vehicles. While STEP was capable of carrying multiple experiments, this mission carried just one - the SIDEX (Signal Identification Experiment). The experiment, in keeping with Space Test Program objectives to deinge the military role in space research, evaluated a number of specific signal detection and modulation methods.

STEP 2 did not achieve the planned orbit though it still provided useful data.

Nation: USA
Type / Application: Experimental
Operator: USAF STP (Space Test Program)
Contractors: TRW, CTA → Orbital Sciences Corporation (OSC) (Bus)
Equipment: SIDEX
Configuration: LEOStar
Propulsion: None
Power: 4 deployable fixed solar arrays, batteries
Mass: 180 kg
Orbit: 834 km × 606 km, 81.9 (830 km × 830 km planned)
Satellite COSPAR Date LS Launch Vehicle Remarks
STEP 2 (SIDEX, P91-2) 1994-029A 19.05.1994 Ed, B-52, RW04/22 P Pegasus HAPS


Further STP missions: