1. AT+CGNSPWR=1 //打开GPS电源

正常返回“OK” AT+CGNSPWR=0 //关闭GPS电源   2、AT+CGNSSEQ="RMC"//定义NMEA解析 返回: “OK”   3、AT+CGNSINF //获取GPS定位信息 返回: AT+CGPSINF +CGNSINF:1,1,20151031073440.000,22.275393,113.507882,5.200,0.02,351.3,1,,1.2,1.9,1.5,,12,9,,,46,, OK 数据内容定义，请查阅“SIM800 Series_GNSS_Application Note V1.00”

2. AT+CGNSURC=1//间隔1S输出定位信息

返回: +UGNSINF:1,1,20151031073659.000,22.275405,113.507875,4.700,0.04,250.6,1,,1.2,1.9,1.5,,12,9,,,48,, 之后串口就会不断的输出NMEA信息   详细的配置和信息的解析，请查看“SIM800 Series_GNSS_ApplicationNote V1.00”。
定位不成功： +UGNSINF:1,0,20161105064849.104,,,,0.00,0.0,0,,,,,,4,0,,,38,, +UGNSINF:1,0,20161105064945.303,,,,726.95,234.9,0,,,,,,7,3,,,45,,
定位成功： +UGNSINF:1,1,20161105065046.000,22.827863,113.61953,38.100,0.00,242.5,1,,1.3,1.6,0.9,,9,6,,,46,,
+UGNSINF: 1,1,20161105073116.000,22.858005,113.263150,40.900,7.56,166.2,1,,0.9,1.2,0.8,,10,9,,,42,,

{     if((p1 = (char*)strstr((const char*)Uart2_Buf, "+UGNSINF: 1,1,")), (p1 != NULL)) //寻找开始符     {         if((p2 = (char*)strstr((const char*)p1, "x0dx0a")), (p2 != NULL)) //寻找结束符         {             *p2 = 0;//添加结束符             p2 = strtok((p1), ",");             p2 = (char*)strtok(NULL, ",");             p2 = (char*)strtok(NULL, ",");             UART1_SendString("时间:");             UART1_SendString((char *)p2);             UART1_SendLR();             p2 = (char*)strtok(NULL, ",");             UART1_SendString("纬度:");             UART1_SendString((char *)p2);             UART1_SendLR();             p2 = (char*)strtok(NULL, ",");             UART1_SendString("经度:");             UART1_SendString((char *)p2);             UART1_SendLR();             p2 = (char*)strtok(NULL, ",");             UART1_SendString("海拔:");             UART1_SendString((char *)p2);             UART1_SendLR();             UART1_SendLR();             CLR_Buf2();         }     } }