One reason for routinely launching GPS satellites is simply "constellation replenishment," said Col. Andrew Menschner, deputy commander of the Space Force's Space Systems Command. Old satellites degrade and die, and new ones need to go up and replace them. At least 24 GPS satellites are needed for global coverage, and having additional satellites in the fleet can improve navigation precision. Today, there are 31 GPS satellites in operational service, flying more than 12,000 miles (20,000 kilometers) above the Earth.
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第二件事，是中科第五纪在近期接连完成Pre-A及Pre-A+轮融资，两笔交易在一个月之内完成，规模达数亿元。其中，Pre-A轮由红杉中国领投，东方富海跟投；Pre-A+轮由芯能创投、优山资本联合领投，清控金信跟投。