GNSS: Triple-frequency Constellations

摘要

Triple-frequency observations for high-accuracy positioning has been studied for years. It's proven to greatly improve RTK performance (fix rate, reliability, and precision) in challenging scenarios for dual-frequency RTK, for example with a very a long base line, very active ionospheric motion, and a severe multi-path environment. Triple-frequency observations also help shorten PPP convergency time significantly. In 2020, with Beidou3 and Galileo (nearly) put to full operation, we are about to see a lot more modernized satellites equipped with triple-frequency payload.