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GPS (Global Positioning System)是一個衛星定位系統,使用31個衛星。
GPS 類似 "人造衛星" ,以公尺為計算單位。某些形態的GPS,可以較公分為佳的單位進行度量。
利用先進的科技,從IC及其它的元件中接收訊號。
它大量的降低了成本。
因為它大量降低成本的特性,它可以輕鬆的被整合到手機、筆記型電腦及像是耕作用具、瀏覽系統及建築物...等傳統工具中。tion systems and construction equipment.
(你可以在這個位址Global Positioning System Overview取得其它的相關資訊。)
這個分類中可以找到所有GPS的資訊.
PMB 2520 Hammerhead是GPS的one-chip解決方案,它由全球定位公司的Infineon Technologies所製造。它允許支援A-GPS標準的資料存取。 (相關的資料都可以在 PMB 2520 datasheet中找到) short datasheet
Hammerhead包含了以下的模組:
Hammerhead整合了三個系列的介面:
在Hammerhead的UART是一個full-duplex UART 界面。它被固定在8N1(8 data bits, no parity, 1 stop bit)模式。在GTA01中,主要的處理器透過UART連接到這裡。在Neo1973的所有產品當中,它連接到敘列埠。
The Hammerhead driver software will be delivered as a binary, which can be interfaced to gpsd as it outputs NMEA information, as many serial GPSs do.
The gps driver is now available. (There were some problems in the past getting a license to distribute the binary. [1])
The gpsd libraries provide the following infomation to the high level software:
The high level software sends the following messages to the plugin:
Gpsd communicates with the system at the following part:
At the GTA01, the host processor is a S3C2410.
On the GTA01, the Hammerhead are configured that connected with the host processor through the UART. The UART of data output/input is connected to the UART 1 of the SC2410. The UART of the hardware flow control is connected to the UART 2 of the SC2410.
See also Server:A-GPS.
A: Not directly. However, the gpsd program 'gpspipe', with the -r switch will output NMEA data with the current position information. The right way to do it is to use libgpsd in your program if possible.
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