1756-DHRIO Allen Bradley
GPS授時系統的軟件設計
系統軟件主要分為初始化、GPS數據接收存儲、數據傳送子程序3部分。軟件流程如圖4所示。
首先將GPS OEM接收板通過串口與PC連接好，接通主電源和備用電源，用自帶的接收軟件SNSRCFG設置初始化信息，只輸出一條GPRMC語句，保證每秒接收存儲時間信息的精度；然后轉化為NMEA格式，連接上傳，則初始化信息就自動將被保存在板內的永久性存儲器中，下次上電時將會自動生效。如需更改則要再次修改參數和再次上傳。
系統上電后硬件復位，設置UART的波特率為19200b／s，數據通信格式為10位異步收發；授時接收系統進入正常工作狀態，單片機（AT89S51） 通過RS-232串行方式接收GPS OEM板的衛星數據。通過查詢字頭，接收OEM板GPRMC輸出語句中的時、分、秒和年、月、日信息。沒有用的信息跳過。由于接收到的是UTC時間．出于習慣考慮，將UTC時間轉化為北京時間。
本地時間=GPS時間+時區值
北京位于第8時區，時區值為+8。將接收到的時間信息轉化為北京時間，按日、月、年、時、分、秒的順序存儲在片內30H到3BH這12個單元中。然后用 MOVX指令將數據送到片外雙口RAM的0C00H到0COBH中，供另外需要時間信息的CPU調用。圖5為某次仿真結果，時間是北京時間2005年4月 15日9時lO分8秒。
1756-DHRIO Allen Bradley
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