摘要：The second Galileo In-Orbit Validation Element satellite, GIOVE-B, was launched from the Baikonour cosmodrome in Kazakhstan on April 27, 2008.
Its main mission objectives are to maintain frequency filing, provide in‑orbit validation of the Galileo payload units, specifically the passive hydrogen maser (PHM) and solid‑state power amplifiers (SSPAs) that were not flown on GIOVE‑A, measure the middle earth orbit (MEO) radiation environment, and continue signal-in-space (SIS) experimentation.
