Space Technology and Research Vehicle; 50 cm cube. STRV-1a and -1b are a pair of microsatellites designed to test new space technologies and make measurements of the space environment and its effect on spacecraft systems. The emphasis of the project is on low-cost, short timescale access to space and the rapid dissemination of experimental data. Although built and operated by the UK's Defence Research Agency, many experiments are collaborative, involving the Ballistic Missile Defense Organisation, the European Space Agency and Universities. After 2.5 years of operation the spacecraft has been turned over to NASA and the University of Colorado for communications experiments.
Spacecraft: Each spacecraft has a cubic structure based on carbon/PEEK thermoplastic skinned aluminum honeycomb panels. Four GaAs solar panels provide 31-33W (BoL) to a 28V power distribution bus and 16 NiCd batteries. Platform requirements are approximately 19W, leaving 13W for payload operations. On-board data handling uses a GEC Plessey MIL-STD-1750 processor employing radiation tolerant SOS technology. ESA CCSDS telemetry and telecommand standards are observed. Communications are through the S-band (2.2GHz); 125bps uplink and 1kbps downlink through a 1W omni-direction antenna. Both STRVs are spin-stabilised at approximately 5rpm with attitude determination achieved via V-slit Sun and Earth sensors and analogue Sun sensors. Control is through magnetorquers and a cold gas thruster system. Payload: Both spacecraft carry a variety of space technology and environment experiments. In fact, even the spacecraft's' carbon/PEEK structures are experimental. Specific payloads on -1a are the Atomic Oxygen Experiment, Battery Recharge, Cold Ion Detector, Cosmic Ray & Dosimetry Monitor, Langmuir Probe, Radiation Dose Rate Sensor, Surface Charge Detector and the Xenon Plasma Charge Neutraliser. On-board -1b are the Cryocooler/Vibration Suppression Experiment, Infrared Detectors, Neural Network Microprocessors, Radiation Environment Monitor, Single Event Upset & Radiation Monitor and the Solar Cell Technology Experiment.
Design Life: 1 year. Total Length: 0.5 m. Maximum Diameter: 0.5 m.
50 cm cube; Space Technology and Research Vehicle; included solar cell tests.