Due to technical reasons, the GPS modernization IIF satellite series originally scheduled to be launched in 2005 was delayed for a long time, and now a GPS modernization IIR20-(M) satellite belonging to the IIR satellite series was successfully launched on March 24, 2009 , it has the function of transmitting L1, L2, L3, L5 channel signals. It is the first step in the modernization of GPS to broadcast three civilian frequencies (L1, L2, L5), and it is a milestone in the modernization process of GPS. And for this The GPS satellite also detected for the first time that it was emitting L3 channel signals. According to relevant information, it provides communication links for the Nuclear Explosion Detection System (NDS) platform installed on GPS to detect nuclear explosions or other high-energy infrared radiation events. .
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