raspberry-pi - GPS数据解析

Question

我得到了 USB DeLORME Earthmate GPA LT-20，我想将它用作移动 GPS 批准单元的一部分，基于 Raspberry Pi。我已经能够访问原始串行数据，但与将数据解析为可用格式的有效方法不一致。目前的计划只是将其以有意义的方式打印在屏幕上。只是看想法。波纹管是数据的样本，我已经改变了 GPS 位置数据以删除特定的测试位置。更喜欢用 C 编写代码

我已阅读以下引用网站:

http://www.gpsinformation.org/dale/nmea.htm

https://en.wikipedia.org/wiki/List_of_GPS_satellites

$GPRMC,050229.000,A,3XX8.647,N,11XX1.282,W,0.1,0.0,140518,11.7,E*4B
$GPGGA,050229.000,3XX8.64662,N,11XX1.28205,W,1,06,1.5,725.48,M,-28.4,M,,*5D
$GPVTG,0.0,T,11.7,M,0.1,N,0.1,K*79
$GPGSV,3,1,09,10,34,240,34,13,24,054,00,15,47,086,26,16,25,292,30*77
$GPGSV,3,2,09,20,79,310,31,21,65,345,37,26,25,260,00,27,11,320,00*78
$GPGSV,3,3,09,29,46,147,34,,,,,,,,,,,,*4C
$PSTMECH,21,7,20,7,15,7,29,7,10,7,00,0,16,7,00,0,00,0,00,0,00,0,00,0*5C

Answer 1

查看此信息:

`"$GPRMC,050229.000,A,3008.647,N,11001.282,W,0.1,0.0,140518,11.7,E*4B"`

使用strtok进行解析:

int main(void)
{
    FILE *fp = fopen("test.txt", "r");

    char buf[256];
    char *array[20];
    while(fgets(buf, sizeof(buf), fp))
    {
        if(strstr(buf, "$GPRMC"))
        {
            int count = 0;
            char *token;
            token = strtok(buf, ",");
            while(token != NULL)
            {
                array[count++] = token;
                token = strtok(NULL, ",");
                if(count == 20)
                    break;
            }

            printf("Latitude : %s %s\n", array[3], array[4]);
            printf("Longitude : %s %s\n", array[5], array[6]);
        }
    }

    return 0;
}

结果:

Latitude : 3008.647 N
Longitude : 11001.282 W