public AisMessage CreateMessage(BitArray payload)
{
var type = payload.DecodeByte(0, 5);
if (type != c_type)
{
throw new Exception(string.Format("Incorrect type, expected 18 but present:{0}", type));
}
var timeStamp = DateTime.UtcNow.ToFileTimeUtc();
byte repeatIndicator = payload.DecodeByte(6, 7);
uint mmsi = payload.DecodeUInt32(8, 37);
float sog = (float)payload.DecodeUInt32(46, 55) / 10;
bool posAccuracy = payload.DecodeBool(56);
float longtitude = (float)payload.DecodeFloat(57, 84) / 600000;
float latitude = (float)payload.DecodeFloat(85, 111) / 600000;
float cog = (float)payload.DecodeUInt32(112, 123) / 10;
ushort heading = payload.DecodeUShort(124, 132);
byte utcSeconds = payload.DecodeByte(133, 138);
CsUnitType csUnit = payload.DecodeBool(141) ? CsUnitType.ClassBCarrierSense : CsUnitType.ClassBSotdma;
bool display = payload.DecodeBool(142);
bool dsc = payload.DecodeBool(143);
bool band = payload.DecodeBool(144);
bool message22 = payload.DecodeBool(145);
bool assigned = payload.DecodeBool(146);
bool raim = payload.DecodeBool(147);
uint radioStatus = payload.DecodeUInt32(148, 167);
return(new ClassBPositionReportMessage(
type,
timeStamp,
repeatIndicator,
mmsi,
sog,
posAccuracy,
longtitude,
latitude,
cog,
heading,
utcSeconds,
raim,
radioStatus,
csUnit,
display,
dsc,
band,
message22,
assigned));
}
public ClassBPositionReportMessage(byte type, long timeStamp, byte repeatIndicator, uint mmsi, float speedOverGround, bool positionAcuracy, float longtitude, float latitude, float courseOverGround, ushort trueHeading, byte utcSeconds, bool raimFlag, uint radioStatus, CsUnitType csUnit, bool displayFlag, bool dscFlag, bool bandFlag, bool message22Flag, bool assignedMode) : base(type, timeStamp)
{
RepeatIndicator = repeatIndicator;
Mmsi = mmsi;
SpeedOverGround = speedOverGround;
PositionAcuracy = positionAcuracy;
Longtitude = longtitude;
Latitude = latitude;
CourseOverGround = courseOverGround;
TrueHeading = trueHeading;
UtcSeconds = utcSeconds;
RaimFlag = raimFlag;
RadioStatus = radioStatus;
CsUnit = csUnit;
DisplayFlag = displayFlag;
DscFlag = dscFlag;
BandFlag = bandFlag;
Message22Flag = message22Flag;
AssignedMode = assignedMode;
}
