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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.
The PMB 2520 Hammerhead is a one-chip solution for GPS that is produced by Infineon Technologies in cooperation with Global Locate. It allows the usage of assistance data by supporting A-GPS standards.
(all infomation is coming from the datasheet of PMB 2520) short datasheet
The Hammerhead consists of the following modules:
The Hammerhead integrates 3 serial interfaces:
The UART in the Hammerhead is a full-duplex UART interface. It is fixed in 8N1(8 data bits, no parity, 1 stop bit) mode. On the GTA01, the host processor connect with the Hammerhead through the UART. In all models of Neo1973, this is connected to a serial port.
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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