private string DecodeVelocityOverGroundMsg(ModeSReply msg, DateTime timestamp)
{
VelocityOverGroundMsg velocity = (VelocityOverGroundMsg)msg;
if (msg.ICAO24 == null)
{
return("VelocityOverGroundMsg: No ICAO24 found.");
}
string icao24 = BitConverter.ToString(msg.ICAO24).Replace("-", String.Empty);
// check if ICAO is already stored in lookup table
ADSBInfo info = null;
if (!adsbinfos.TryGetValue(icao24, out info))
{
// no --> add new entry
info = new ADSBInfo();
info.ICAO24 = icao24;
adsbinfos.Add(icao24, info);
}
// add information
if (velocity.HasValidVelocity)
{
info.Speed = velocity.Velocity;
}
if (velocity.HasValidHeading)
{
info.Heading = velocity.Heading;
}
return("[" + info.ICAO24 + "] VelocityOverGroundMsg: Speed=" + info.Speed.ToString() + ", Heading= " + info.Heading.ToString());
}
private string DecodeIdentificationMsg(ModeSReply msg, DateTime timestamp)
{
IdentificationMsg ident = (IdentificationMsg)msg;
if (msg.ICAO24 == null)
{
return("IdentifyMsg: No ICAO24 found.");
}
string icao24 = BitConverter.ToString(msg.ICAO24).Replace("-", String.Empty);
// check if ICAO is already stored in lookup table
ADSBInfo info = null;
if (!adsbinfos.TryGetValue(icao24, out info))
{
// no --> add new entry
info = new ADSBInfo();
info.ICAO24 = icao24;
adsbinfos.Add(icao24, info);
}
// add call sign
info.Call = ident.getIdentity();
return("[" + info.ICAO24 + "] IdentificationMsg: Call=" + info.Call);
}
private string DecodeAirbornePositionMsg(ModeSReply msg, DateTime timestamp)
{
// Airborne position message --> we need subsequent messages to decode
AirbornePositionMsg pos = (AirbornePositionMsg)msg;
if (msg.ICAO24 == null)
{
return("AirbornePositionMsg: No ICAO24 found.");
}
string icao24 = BitConverter.ToString(msg.ICAO24).Replace("-", String.Empty);
// check if ICAO is already stored in lookup table
ADSBInfo info = null;
if (!adsbinfos.TryGetValue(icao24, out info))
{
// no --> add new entry
info = new ADSBInfo();
info.ICAO24 = icao24;
adsbinfos.Add(icao24, info);
}
// adsbinfo found --> update information and calculate position
// contains valid position?
if (!pos.HasValidPosition)
{
// no --> return error meesage
return("[" + info.ICAO24 + "] AirbornePositionMsg: No valid position found.");
}
info.ICAO24 = icao24;
info.NICSupplementA = pos.NICSupplementA;
// position calculated before
if (!double.IsNaN(info.Lat) & !double.IsNaN(info.Lon))
{
try
{
// use local CPR
double[] localpos = pos.getLocalPosition(info.Lat, info.Lon);
// we have a pos --> store in info and update timestamp
info.Lat = localpos[0];
info.Lon = localpos[1];
if (pos.HasValidAltitude)
{
info.Alt = pos.Altitude;
}
info.Timestamp = timestamp;
return("[" + info.ICAO24 + "] AirbornePositionMsg: Lat= " + info.Lat.ToString("F8") + ", Lon=" + info.Lon.ToString("F8") + ", Alt= " + info.Alt.ToString() + ", Time= " + info.Timestamp.ToString("HH:mm:ss.fff"));
}
catch (Exception ex)
{
}
}
// no position calculated before
if (pos.IsOddFormat)
{
try
{
// odd message
info.LastOddAirborne = pos;
info.LastOddTimestamp = DateTime.UtcNow;
// check if even message was received before and not older than 10secs--> calculate global CPR
if ((info.LastEvenAirborne != null) && ((info.LastOddTimestamp - info.LastOddTimestamp).TotalSeconds <= 10))
{
try
{
double[] globalpos = pos.getGlobalPosition(info.LastEvenAirborne);
// we have a position --> store in info and update timestamp
info.Lat = globalpos[0];
info.Lon = globalpos[1];
if (pos.HasValidAltitude)
{
info.Alt = pos.Altitude;
}
// info.Timestamp = timestamp;
return("[" + info.ICAO24 + "] AirbornePositionMsg: Lat= " + info.Lat.ToString("F8") + ", Lon=" + info.Lon.ToString("F8") + ", Alt= " + info.Alt.ToString() + ", Time= " + info.Timestamp.ToString("HH:mm:ss.fff"));
}
catch
{
return("[" + info.ICAO24 + "] AirbornePositionMsg: Error while decoding position");
}
}
return("[" + info.ICAO24 + "] AirbornePositionMsg: No decoding possible yet");
}
catch (Exception ex)
{
}
}
// even message
info.LastEvenAirborne = pos;
info.LastEvenTimestamp = DateTime.UtcNow;
// check if odd message was received before and not older than 10secs --> calculate global CPR
if ((info.LastOddAirborne != null) && ((info.LastEvenTimestamp - info.LastOddTimestamp).TotalSeconds <= 10))
{
try
{
double[] globalpos = pos.getGlobalPosition(info.LastOddAirborne);
// we have a position --> store in info and update timestamp
info.Lat = globalpos[0];
info.Lon = globalpos[1];
if (pos.HasValidAltitude)
{
info.Alt = pos.Altitude;
}
// info.Timestamp = timestamp;
return("[" + info.ICAO24 + "] AirbornePositionMsg: Lat= " + info.Lat.ToString("F8") + ", Lon=" + info.Lon.ToString("F8") + ", Alt= " + info.Alt.ToString() + ", Time= " + info.Timestamp.ToString("HH:mm:ss.fff"));
}
catch
{
return("[" + info.ICAO24 + "] AirbornePositionMsg: Error while decoding position");
}
}
else
{
return("[" + info.ICAO24 + "] AirbornePositionMsg:No decoding possible yet");
}
}
