//=======================================================================
//=======================================================================
public static bool TryParse(string inputString, out GgaData ggaData)
{
try
{
ggaData = Parse(inputString);
return(true);
}
catch
{
ggaData = null;
return(false);
}
}
//=======================================================================
#region -= static methods =-
//=======================================================================
public static GgaData Parse(string inputString)
{
if (string.IsNullOrEmpty(inputString) || inputString.IndexOf("*", StringComparison.Ordinal) < 0)
{
return(null);
}
//---- declare vars
GgaData data = new GgaData();
string dataString = inputString.Substring(0, inputString.IndexOf('*')); // strip off the checksum
string[] values = dataString.Split(',');
//---- if we don't have 15 (header + 14), it's no good
if (values.Length < 15)
{
throw new FormatException();
}
//---- if the time is six digits
if (values[1].Length == 9)
{
//---- make sure that they're actually numbers
//int temp;
//if (int.TryParse(values[1], out temp))
//{
//---- should add more validation here
int hour = int.Parse(values[1].Substring(0, 2));
int minute = int.Parse(values[1].Substring(2, 2));
int second = int.Parse(values[1].Substring(4, 2));
int millisecond = 0;
if (values[1].Length >= 9)
{
millisecond = Convert.ToInt32(double.Parse(values[1].Substring(6, 3)) * 1000);
}
data.UtcTime = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, hour, minute, second, millisecond);
//}
//else { throw new FormatException("Date or time string is invalid"); }
}
//由于长春老网口版，上面会抛异常所以注销掉，20160323
//else { throw new FormatException("Date or time string is invalid"); }
//---- lat/long position
data.Position = Position.Parse(values[2] + "," + values[3] + ";" + values[4] + "," + values[5]);
//---- quality
data.Quality = (Quality)Enum.Parse(typeof(Quality), values[6]);
switch (int.Parse(values[6]))
{
case 0:
data.Quality = Quality.NoFix;
break;
case 1:
data.Quality = Quality.GpsFix;
break;
case 2:
//data.Quality = Quality.DifferentialGpsFix;
//todo:北斗星通，E,2时认为是高精度
data.Quality = Quality.FixedRealTimeKinematic;
break;
case 3:
data.Quality = Quality.PulsePerSecond;
break;
case 4:
data.Quality = Quality.FixedRealTimeKinematic;
break;
case 5:
data.Quality = Quality.FloatRealTimeKinematic;
break;
case 6:
data.Quality = Quality.Estimated;
break;
case 7:
data.Quality = Quality.ManualInput;
break;
case 8:
data.Quality = Quality.Simulated;
break;
default:
data.Quality = Quality.Unknown;
break;
}
//---- number of satellites
data.NumberOfSatelitesInUse = int.Parse(values[7]);
//---- HDOP
data.HorizontalDilutionOfPrecision = (string.IsNullOrEmpty(values[8]) ? 0 : decimal.Parse(values[8]));
//---- elevation
if (!string.IsNullOrEmpty(values[9]) && !string.IsNullOrEmpty(values[10]))
{
data.Elevation = Elevation.Parse(values[9] + "," + values[10]);
}
//---- geoidal separation
if (!string.IsNullOrEmpty(values[11]) && !string.IsNullOrEmpty(values[12]))
{
data.GeoidalSeparation = GeoidalSeparation.Parse(values[11] + "," + values[12]);
}
//---- age
data.DifferenceCorrection.Age = (string.IsNullOrEmpty(values[13]) ? 0M : decimal.Parse(values[13]));
//---- station ID
if (!string.IsNullOrEmpty(values[14]))
{
data.DifferenceCorrection.StationID = values[14];
}
//---- return
return(data);
//eg3. $GPGGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*hh
//1 = UTC of Position
//2 = Latitude
//3 = N or S
//4 = Longitude
//5 = E or W
//6 = GPS quality indicator (0=invalid; 1=GPS fix; 2=Diff. GPS fix)
//7 = Number of satellites in use [not those in view]
//8 = Horizontal dilution of position
//9 = Antenna altitude above/below mean sea level (geoid)
//10 = Meters (Antenna height unit)
//11 = Geoidal separation (Diff. between WGS-84 earth ellipsoid and
// mean sea level. -=geoid is below WGS-84 ellipsoid)
//12 = Meters (Units of geoidal separation)
//13 = Age in seconds since last update from diff. reference station
//14 = Diff. reference station ID#
//15 = Checksum
}
private static void ParseSentence(GpsReading gpsReading, string sentence)
{
var cmd = ParseCommand(sentence);
if (string.IsNullOrEmpty(cmd))
{
return;
}
//GPNTR
switch (cmd.ToUpper())
{
case "$GPGGA":
case "$GNGGA":
case "$BDGGA":
gpsReading.FixedGpsData = GgaData.Parse(sentence);
break;
case "$GPVTG":
case "$GNVTG":
case "$BDVTG":
gpsReading.GroundVector = VtgData.Parser(sentence);
break;
case "$GPRMC":
case "$GNRMC":
case "$BDRMC":
gpsReading.Summary = RmcData.Parse(sentence);
break;
case "#HEADINGA":
gpsReading.Heading = HgaData.Parse(sentence);
break;
case "#BESTUTMA":
gpsReading.Utm = UtmData.Parse(sentence);
break;
case "$GPNTR":
gpsReading.NtrData = NtrData.Parse(sentence);
break;
//case "$GPGSA":
// gpsReading.DopActiveSatellites = GsaData.Parse(sentence);
// break;
//case "$GPGSV":
// gpsReading.SatellitesInView.Add(GsvData.Parse(sentence));
// break;
//case "$GPHDT":
// gpsReading.HdtData = HdtData.Parse(sentence);
// break;
case "$PTNL":
if (sentence.IndexOf("AVR", System.StringComparison.Ordinal) > 0)
{
gpsReading.AvrData = AvrData.Parse(sentence);
}
else if (sentence.IndexOf("VGK", System.StringComparison.Ordinal) > 0)
{
gpsReading.VgkData = VgkData.Parse(sentence);
}
break;
}
}
