4.  NAVIGATION DATA RECORDER OUTPUT

4.1   RS-232 Navigation Data Output to Payload Areas

The data from all naviagation data inputs is accumulated in a buffer for one second. The data is processed
and output to the RS-232 data bus at 9600 bps. This results in a delay of one second between the actual time
the data are received and the time they are output on the RS-232 data bus. The time is correct to 1ms. The
output format is as follows:
 
 
Parameter Units Output Format Byte Size Source
Header, GPS Status `SOH' [G/N] ASCII  XX 2 Inserted
UTC Time (GMT) days:hrs:min:sec ASCII  XXX:XX:XX:XX 12 GPS
Present Pos. Latitude DEGREES ASCII  N/S XX.XXXXX 9 INU
Present Pos. Longitude DEGREES ASCII  E/W XXX.XXXXX 10 INU
True Heading DEGREES ASCII  XXX.XX 6 INU
Pitch angle (+up) DEGREES ASCII  ±XX.XXXX 8 INU
Roll angle (+ rt) DEGREES ASCII  ±XX.XXXX 8 INU
Ground speed m/s ASCII  XXX.XX 6 INU
Track Angle true DEGREES ASCII  XXX.XX 6 INU
Inertial wind speed m/s ASCII  XX.X 4 INU
Inertial wind direction DEGREES ASCII  XXX.X 5 INU
Body Longit. Accel G ASCII  ±X.XXX 6 INU
Body Lateral Accel G ASCII  ±X.XXX 6 INU
Body Normal Accel. G ASCII  ±X.XXX 6 INU
Track angle rate DEGREES/sec ASCII  ±XX.X 5 INU
Pitch rate DEGREES/sec ASCII  ±XX.X 5 INU
Roll rate DEGREES/sec ASCII  ±XX.X 5 INU
Inertial vertical speed m/s ASCII  ±XX.XX 6 INU
GPS Altitude m ASCII  XXXXX.X 7 GPS
GPS Latitude DEGREES ASCII  N/SXX.XXXXX 9 GPS
GPS Longitude DEGREES ASCII  E/WXXX.XXXXX 10 GPS
Static pressure * mb ASCII  XXXX.XXX 8 Analog
Total Pressure mb ASCII  XXXX.XXX 8 Analog
Differential pressure mb ASCII  XX.XXX 6 Analog
Total Temperature * Degrees C ASCII  ±XX.XX 6 Analog
Static Temperature * Degrees C ASCII  ±XX.XX 6 Derived
Barometric Altitude * m ASCII  XXXXX.X 7 Derived
Mach No. * N/A ASCII  X.XXX 5 Derived
True Air Speed * m/s ASCII  XXX.XX 6 Derived
Wind Speed * m/s ASCII  XX.X 4 Derived
Wind Direction * DEGREES ASCII  XXX.X 5 Derived
Sun Elevation DEGREES ASCII  ±XX.XX 6 Derived
Sun Azimuth DEGREES ASCII  XXX.XX 6 Derived
Analog Channesl (12) Volts ASCII  ±X.XXX 6 ea. (72 total) Analog
End of Frame LF, CR ASCII  0xD, 0xA 2 Inserted

                        G:  GPS Valid
                        N:  GPS Not Valid

                       NOTE:  Each parameter is followed by a space. The values for each of the 12 analog channels are separated by spaces.

                        * These values are not valid below an aircraft altitude of 10 km.
 

4.2   RS-232 Time Channel Data Format

Data from the GPS time and date lavels are read, translated and formatted. These data are sent on the RS-232 time
channel at 9600 bps. The date is Julian and  the time is Universal Coordinated Time (UTC). The string is terminated
by a carriage retuyrn and line feed. The effective time begins at the first character of this frame with < 0.1 ms of delay.
The output format is as follows:
DATE_ _XXX_ _TIME_ _XX:XX:XX <CR> <LF>  (27 chars total)