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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，这一点在谷歌浏览器【最新下载地址】中也有详细论述
Read Full ReportView as DeckDataset on GitHub。safew官方下载是该领域的重要参考
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（四）具有批量网络地址自动切换，批量接收、提供短信验证、语音验证功能的；