全球最大的GPS模块产品供应商，美国SiRF公司提供的产品接口说明文件，详细描述了该公司系列GPS模块产品的接口通讯格式说明与参数，供GPS产品开发者参考。...

基于JT/T808 协议及数据格式的GPS终端模拟程序，符合交通部的例子，可以参考

基于安卓的GPS定位开发源代码，java语言，解压之后直接导入就行了。

移动设备GIS开发包 是免费的可在ARM X68平台上开发-GIS Development Kit for mobile devices is free of charge in the ARM X68 platform

qt gps ,linux redhat9.0,-qt gps, linux redhat9.0,

这个程序是用来对PLLpre进行仿真的，该思想基于多方面的考虑-This procedure is used to PLLpre simulation, based on the thinking of a number of considerations

GPS C/A code signal genration

The idea behind differential GPS is to remove as much errors as possible from the range measurements by establishing these errors at a reference site. In its most simple setup, a GPS receiver is located at a well surveyed position and its (pseudo) range measurements are compared with the actual calculated range from this receiver to the SV s. The differences between measured ranges and calculated ranges at the reference receiver are applied as corrections to the ranges measured by other receiver(s) close by.

procedure TfrmMain.DrawSatInfo(gps: TGPSInfo; pbx: TPaintBox); var   i: integer;   r: integer;   dx,dy: integer; begin   r := pbx.Width div 2;   for i:= 1 to 12 do begin     if gps.SatInfo[i].PRN 0 then begin       dx := r + Round(r*(90-gps.SatInfo[i].EL)*sin((gps.SatInfo[i].AZ - 90)*Pi/180)/90);       dy := r + Round(r*(90-gps.SatInfo[i].EL)*cos((gps.SatInfo[i].AZ - 90)*Pi/180)/90);       dx := dx - 8;       if dx < 0 then dx := 0;       if gps.SatInfo[i].SN > 20 then begin         pbx.Canvas.Font.Color := clBlue;         pbx.Canvas.TextOut(dx,dy,inttostr(gps.SatInfo[i].PRN));       end else begin

对GPS模块的数据处理本质上还是串口通信程序设计，只是GPS模块的输出遵循固定的格式，通过字符串检索查找即可从模块发送的数据中找出需要的数据，常用的GPS模块大多采用NMEA-0183 协议。NMEA-0183 是美国国家海洋电子协会(National Marine Electronics Association)所指定的标准规格，这一标准制订所有航海电子仪器间的通讯标准，其中包含传输资料的格式以及传输资料的通讯协议。

有关GPS GDOP度量分析的一文章，有兴趣的朋友可以下载看看！希望会有所帮助。-GPS GDOP metric related to the analysis of one article, interested friends can download to see! Hope will be helpful.