Life is what happens to you while you're busy making other plans.
你下班之後都在幹嘛?
Monday, January 28, 2013
衛星定位系統
GPS: 美國
GLONASS: 俄羅斯
GNSS: 中國(北斗)
GNSS
優點: 中國政府力推,商機大,
缺點: 衛星數少,開機無法立即定位,隧道、地下室無訊號。
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