Last update: Wed Apr 22 15:15:06 MDT 2009

IWG1 ASCII Packet Definition

String will be prefaced with IWG1 as the magic-cookie to identify this stream.
The date-time (UTC) field will use iso-8601, any of the following iso-8601 forms is acceptable:
```
    yyyy-mm-ddThh:mm:ss
    yyyy-mm-dd hh:mm:ss
    yyyymmddThhmmss
```

Omitted time-zone shall be interpreted as UTC. This deviates from the iso-8601 specification which specifies no time zone information to be interpreted as local time.

Values will be comma separated. This will allow for little loss of bandwidth for missing values.
Data values other than date will be in any format acceptable to the ANSI C string-to-double function strtod(3).

Recommend to implemetors to use appropriate significant figures.
inf and nan are acceptable.
Fields not supplied or available will be left empty (e.g. '...,4.523,,48.234,...').

String will be terminated by \r\n (carriage return, newline).

Example Format

Example String

Parameter List

The list of variables will be fixed in the following order, these are all platform 'best' values. Custom parameters may be added at the end of this list on a per platform then per deployment basis.

Short Name	Units	Range	Description
Date/Time	UTC		ISO-8601 formatted date and time
Lat	degree_N (dec)	-90 to 90	Platform Latitude
Lon	degree_E (dec)	-180 to 179.9999	Platform Longitude
GPS_MSL_Alt	m		GPS Altitude, Mean Sea Level (MSL)
WGS_84_Alt	m		WGS 84 Geoid Altitude
Press_Alt	feet		Pressure Altitude
Radar_Alt	feet	Zero or greater	Radar Altimeter Altitude
Grnd_Spd	m/s		Ground Speed
True_Airspeed	m/s		True Airspeed
Indicated_Airspeed	knots		Indicated Airspeed
Mach_Number			Aircraft Mach Number
Vert_Velocity	m/s	[3]	Aircraft Vertical Velocity
True_Hdg	degrees_true	0 to 359.9999	True Heading
Track	degrees_true	0 to 359.9999	Track Angle
Drift	degrees		Drift Angle
Pitch	degrees	-90 to 90 [1]	Pitch
Roll	degrees	-90 to 90 [2]	Roll
Side_slip	degrees		Side Slip Angle
Angle_of_Attack	degrees	-90 to 90 [1]	Angle of Attack
Ambient_Temp	degrees_C		Ambient Temperature
Dew_Point	degrees_C		Dew Point
Total_Temp	degrees_C		Total Temperature
Static_Press	mbar		Static Pressure
Dynamic_Press	mbar		Dynamic Pressure (total minus static)
Cabin_Pressure	mbar		Cabin Pressure / Altitude
Wind_Speed	m/s	Zero or greater	Wind Speed
Wind_Dir	degrees_true	0 to 359.9999	Wind Direction
Vert_Wind_Spd	m/s	[3]	Vertical Wind Speed
Solar_Zenith	degrees		Solar Zenith Angle
Sun_Elev_AC	degrees		Sun Elevation from Aircraft
Sun_Az_Grd	degrees_true	0 to 359.9999	Sun Azimuth from Ground
Sun_Az_AC	degrees_true	0 to 359.9999	Sun Azimuth from Aircraft

[1] Negative is nose down, positive is nose up.
[2] Negative is left wing down, positive is right wing down.
[3] Negative is downward, positive is upward.