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Wintec WSG-1000 Manual

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第九章 疑難排解
當在以下情況可能會收不到GPS 訊號或收訊不良情況發生。
當位於隧道、建築物內可能會收不到任何訊號，由於GPS信號理
論上來說必須是直線方能收到。
在高樓林立的道路、山區樹木遮蔽天空的道路，可能會有收訊
不良的情況，雖然G-Trender可接收反射的甚至很微弱的GPS衛
星信號，但是在此狀況下，定位的精確度也勢必會受到一定的
影響。
若將GPS 接收器置於車內，某些隔熱紙會阻斷GPS 訊號，影響
訊號接收品質。由於GPS 衛星是由美國政府所提供，有時因某
種因素降低其精準度（如在戰時或刻意封鎖某一區域時），在
這種情況下，定位點有可能偏離其正確的位置。
當在導航軟體上看到GPS所提供的定位偏離實際道路時，有時會
因為大氣層變化的影響造成定位誤差變大，這實所難免，但若
您發現無論信號好壞位置總是偏移，很可能是您使用的地圖的
座標系統並非GPS標準的WGS-84的座標系統。
某些導航軟體讀取NMEA0183 GPS接收機所提供的導航資料時，
僅讀取經緯度而沒有取用高度資料，所以在地圖上僅能以平面
位置顯示，故當您在高架橋下時，導航軟體無法辨別您在橋上
或是橋下。
假設您在甲地有使用G-Trender並且定位成功後，當您攜帶G-
Trender且在未使用的情況下移動到乙地（超過500公里），您
的G-Trender可能無法在乙地順利定位，主要是由於GPS接收機
根據最後的有效位置、時間、與衛星資料所算出來的甲地的衛
星與乙地的當地衛星不同，所以你可能需要較久的時間方能順
利定位並更新最後有效位置。
GPS和Pocket PC連線後藍芽若要求輸入PIN CODE才可連線，請
輸入0000。
藍芽連線資料需要5秒自我測試，每次開機後請等待5秒後再進
… 214


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