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
1	Keyword	none	Fixed string	IWG1
2	Date/Time	UTC		ISO-8601 formatted date and time
3	Lat	degree_N (dec)	-90 to 90	Platform Latitude
4	Lon	degree_E (dec)	-180 to 179.9999	Platform Longitude
5	GPS_MSL_Alt	m		GPS Altitude, Mean Sea Level (MSL)
6	WGS_84_Alt	m		WGS 84 Geoid Altitude
7	Press_Alt	feet		Pressure Altitude
8	Radar_Alt	feet	Zero or greater	Radar Altimeter Altitude
9	Grnd_Spd	m/s		Ground Speed
10	True_Airspeed	m/s		True Airspeed
11	Indicated_Airspeed	knots		Indicated Airspeed
12	Mach_Number			Aircraft Mach Number
13	Vert_Velocity	m/s	[3]	Aircraft Vertical Velocity
14	True_Hdg	degrees_true	0 to 359.9999	True Heading
15	Track	degrees_true	0 to 359.9999	Track Angle
16	Drift	degrees		Drift Angle
17	Pitch	degrees	-90 to 90 [1]	Pitch
18	Roll	degrees	-90 to 90 [2]	Roll
19	Side_slip	degrees		Side Slip Angle
20	Angle_of_Attack	degrees	-90 to 90 [1]	Angle of Attack
21	Ambient_Temp	degrees_C		Ambient Temperature
22	Dew_Point	degrees_C		Dew Point
23	Total_Temp	degrees_C		Total Temperature
24	Static_Press	mbar		Static Pressure
25	Dynamic_Press	mbar		Dynamic Pressure (total minus static)
26	Cabin_Pressure	mbar		Cabin Pressure / Altitude
27	Wind_Speed	m/s	Zero or greater	Wind Speed
28	Wind_Dir	degrees_true	0 to 359.9999	Wind Direction
29	Vert_Wind_Spd	m/s	[3]	Vertical Wind Speed
30	Solar_Zenith	degrees		Solar Zenith Angle
31	Sun_Elev_AC	degrees		Sun Elevation from Aircraft
32	Sun_Az_Grd	degrees_true	0 to 359.9999	Sun Azimuth from Ground
33	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.