GPS FIX數據，從COM端口讀取端口

Question

我創建了一個非常簡單的應用程序來讀取從Java中的GPS信息。信息以NMEA0183格式在COM1上發送。

除了我無法找到我的位置，因爲RMC和GGA的句子都是空的，一切都很好。我收到了其他與衛星信息和定位的句子，但我想要的只是我現在的位置（長/緯度）。當我檢查超級終端中的數據時，數據即將出現。

這裏是我目前得到的一些例子：

$GPGGA,,,,,,0,00,,,M,,M,,*66 
$GPVTG,0.0,T,,,000.0,N,000.0,K,A*40 
$GPGSA,M,1,,,,,,,,,,,,,-1.0,-1.0,-1.0*10 
$GPGGA,,,,,,0,00,,,M,,M,,*66 
$GPVTG,0.0,T,,,000.0,N,000.0,K,A*40 
$GPGSV,2,1,08,03,00,000,,06,00,000,,11,00,000,,14,00,000,*72 
$GPGSV,2,2,08,19,00,000,,20,00,000,,22,00,000,,24,00,000,*7D 
$GPGSA,M,1,,,,,,,,,,,,,-1.0,-1.0,-1.0*10 
$GPGGA,,,,,,0,00,,,M,,M,,*66 
$GPVTG,0.0,T,,,000.0,N,000.0,K,A*40 
$GPGSV,3,1,12,03,21,351,,06,13,004,,11,55,235,,14,47,126,*78 
$GPGSV,3,2,12,19,49,331,,20,19,272,,22,24,115,,24,41,227,*75 
$GPGSV,3,3,12,31,16,048,,32,43,267,,09,00,160,,12,00,129,*71 
$GPGSA,M,1,,,,,,,,,,,,,-1.0,-1.0,-1.0*10 
$GPGGA,,,,,,0,00,,,M,,M,,*66 
$GPVTG,0.0,T,,,000.0,N,000.0,K,A*40 
$GPGSV,3,1,12,03,21,351,,06,13,004,,11,55,235,,14,47,126,*78 
$GPGSV,3,2,12,19,49,331,,20,19,272,,22,24,115,,24,41,227,*75 
$GPGSV,3,3,12,31,16,048,,32,43,267,,09,00,160,,12,00,129,*71 
$GPGSA,M,1,,,,,,,,,,,,,-1.0,-1.0,-1.0*10 
$GPGGA,,,,,,0,00,,,M,,M,,*66 
$GPVTG,0.0,T,,,000.0,N,000.0,K,A*40 
$GPGSV,3,1,12,03,21,351,,06,12,004,,11,55,235,,14,47,126,*79 
$GPGSV,3,2,12,19,49,331,,20,19,272,,22,24,115,,24,41,227,*75 
$GPGSV,3,3,12,31,16,048,,32,43,267,,09,00,160,,12,00,129,*71 
$GPGSA,M,1,,,,,,,,,,,,,-1.0,-1.0,-1.0*10 

而且我也甲肝probleam檢查GPS設備連接或沒有到計算機。我正在使用rxtxcomm.jar進行COM端口讀取。

代碼開放的COM端口如下

CommPortIdentifier port_id = CommPortIdentifier.getPortIdentifier(serial_port_name_); 
serial_port = (SerialPort)port_id.open("Gps",2000); 
serial_port.setFlowControlMode(SerialPort.FLOWCONTROL_RTSCTS_IN); 
serial_port_.setSerialPortParams(speed, 
          SerialPort.DATABITS_8, 
          SerialPort.STOPBITS_1, 
          SerialPort.PARITY_NONE); 

Answer 1

按照GSV句子，你有沒有從任何衛星的信號列表（信噪比現場爲所有這些爲空） 。在獲得信號強度之前，您不會獲得位置信息。 GPS接收器需要非常理想，但如果將它放在窗戶旁邊，它可能會工作。