PRARE Sensor Description
PRARE is a microwave tracking system operating at centimeter accuracy levels for the measurement of satellite to ground range and range rate. The concept is based on an autonomous spaceborne two-way and dual frequency microwave tracking system with its own telemetry, telecommand, data storage, timing and data transmission capabilities. This allows data analysis on a global basis within a very short time delay. Due to the microwave transmission concept, the system operates independently from weather and daylight conditions.
On ERS-1, the PRARE onboard instrument suffered a destructive RAM latch-up - resulting in a complete loss of the instrument operations about a week after the spacecraft launch. More detailed information on ERS-1 PRARE is available on ERS-1 EOPortal.