Software-defined radios (SDRs) have been around for more than a decade. The first complete Global Positioning System (GPS) implementation was described by Dennis Akos in 1997. Since then several research groups have presented their contribution

本系统主要实现利用GPS模块接收GPS卫星定位数据（包括日期、UTC时间信息，纬度信息、经度信息），并且通过PIC单片机对接收到的有效数据进行存储和控制，最后通过GPRS网络实现将接收到的有效数据及时地传送到指定的服务器上。-The system is mainly achieved using GPS module receives GPS satellite positioning data (including date, UTC time information, latitude in

将年月日时分秒时间转换为GPS系统的周秒时间，可以直接获取电脑时间进行转换或者手工输入。-Every second time in the date is converted to the GPS system seconds, you can directly access the computer time to be converted or manually entered.

NMEA语句读取程序，实现了GPZDA\SDDBS\等解释- NMEALINEREAD currently supports the following NMEA sentences: $GPGGA Global positioning system fixed data $GPGLL Geographic poition [latitude, longitude & time]