Science & Environment
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.
，这一点在谷歌浏览器【最新下载地址】中也有详细论述
"items": ["annual_subscription"],
第一百一十一条 公安机关查处治安案件，对没有本人陈述，但其他证据能够证明案件事实的，可以作出治安管理处罚决定。但是，只有本人陈述，没有其他证据证明的，不能作出治安管理处罚决定。