NMEA PYthon代码集合

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GPS（garmin）使用的是串口线（当然也支持USB线）波特率为4800bps，python使用pyserial模块控制串口

将GPS的接口协议调整为NMEA协议，使用pyserial接收到的信号（每两秒钟刷新一次）例如为

$GPRMC,,V,,,,,,,230509,4.0,W,N*23
$GPRMB,V,,,,,,,,,,,,A,N*13
$GPGGA,,,,,,0,00,,,M,,M,,*66
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPGSV,3,1,12,09,05,055,00,12,37,051,00,14,56,353,00,18,40,161,00*7F
$GPGSV,3,2,12,22,70,199,00,26,09,100,00,29,07,136,00,30,65,091,00*71
$GPGSV,3,3,12,31,41,268,00,32,02,323,00,33,00,000,00,34,00,000,00*77
$GPGLL,,,,,,V,N*64
$GPBOD,,T,,M,,*47
$GPVTG,,T,,M,,N,,K*4E
$PGRME,,M,,M,,M*00
$PGRMZ,,f,1*29
$PGRMM,WGS 84*06
$GPRTE,1,1,c,*37

可参照NMEA协议对抓取的记录进行分析

串口接收的python代码为

#coding=utf-8
import serial
ser=serial.Serial()
ser.port=0
ser.baudrate=4800
ser.open()
while True:
        line=ser.readline()
        if line.startswith('$GPGLL,'):
                st=line.split(',')#0,‘$GPGLL’;1,维度；2，南北半球；3，经度；4，东西经；5，时间
                print st[5],st[4],st[3],st[2],st[1]
        print line,
ser.close()

这样配合python的GUI库，将经纬度打点到DC上，路径就显示出来了

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/weizhe86/archive/2009/05/24/4210707.aspx

Python语言: 从串口接收NMEA数据后发送到GooPs的网络监听端口

#! /usr/bin/env python
#coding=utf-8

import serial
from socket import *
import time
import re

HOST = '127.0.0.1'
PORT = 51234
ADDR = (HOST, PORT)

COM = 'com7'
BAUDRATE = 115200

def main():
    '''接收文本格式的串口数据，以"/n"为分隔符。
    '''
    ser = serial.Serial(COM, baudrate=BAUDRATE)
    last_utc = None
    message = ""
    msg = ""
    try:
        while True:
            data = ser.readline()
            if data:
                # 只有"$GPRMC","$GPVTG"和"$GPGGA"才能发送给GooPs。
                # 我们将同一时刻接受的NMEA语句合并为一个message发给GooPs。
                pattern = '^/$G[PN](?:GGA|RMC),([0-9.]{9}),'
                m = re.match(pattern, data)
                if m:
                    # 屏幕显示
#                    print "raw data: %s" % data
                    utc = m.group(1)
#                    print "utc: %s, last_utc: %s" % (utc, last_utc)
                    if utc == last_utc:
                        message += data
                    else:
                        last_utc = utc
#                        print "before: %s" % message
                        msg = "ace@localhost:%s" % message
                        message = data
#                        print "after: %s" % message
                        tcpCliSock = socket(AF_INET, SOCK_STREAM)
                        tcpCliSock.connect(ADDR)
                        tcpCliSock.send(msg)
                        tcpCliSock.close()
                        print "msg: %s" % msg
            # 给其他程序运行的机会～
            time.sleep(0.1)
    except Exception, e:
        print "error: %s" % e
    finally:
        ser.close()


if __name__ == '__main__':
    main()