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.
核心优势难保留:这条船上现在用的核心系统,包括“Viking”的品牌、酒店管理软件,甚至部分内饰设计,都是维京游轮授权的,不在此次转让范围内,买家买了这船,不能保证维京以后还会给新船东用。
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