View source for .:ARINC429

=Aeronautical Radio, Incorporated (ARINC) 429 Processing=

==process_raw (Level 1)==

'''Purpose'''

Extracts ARINC 429 data from the SEA M300 data acquisition system file (*.sea) and saves the data to one or two output files.

'''Program Flow'''
The process_raw.pro script calls the process_WMI.pro subroutine, which sorts the data based on data type and tag number. For data type 16 and tag numbers 12000 through 12022, call arinc.pro subroutine; for data type 16 and all other tag numbers call arinc429.pro.  The arinc429.pro determines the aircraft ID associated with the data; if aircraft ID equals "FL-946", then go to arinc429_fl946.pro subroutine; otherwise convert the binary ARINC data to an integer and save to .serial.arinc429.raw and .serial.arinc429ch2.raw files.  The arinc429_fl946.pro subroutine converts parameters with known conversion factors from digital data to floating-point type numbers and converts the other binary data to an integer and saves the data to the serial.arinc429.raw and .serial.arinc429ch2.raw files.

'''Subroutines'''
* process_WMI.pro
* arinc429_fl946.pro 
* arinc429.pro 
* arinc.pro
* create_arinc429ch2_fl946_header.pro 
* create_arinc429ch2_header.pro 
* create_arinc429_header.pro 
* create_arinc_header.pro

'''Required Input Files'''

<nowiki>*.sea</nowiki>

'''Output Files'''

Among many other files, process_raw may generate:
*<nowiki>*.serial.arinc.raw'</nowiki>
*<nowiki>*.serial.arinc429.raw'</nowiki>
*<nowiki>.serial.arinc429ch2.raw'</nowiki>

'''Syntax'''

 process_raw <-d> <-v> <-vm> input_file

'''Example'''

 process_raw 23_07_31_11_16_20.sea


==arinc429_fl946.pro Data Conversions==

'''Static and Impact Pressures'''

Calculate the two's complement integer from the 16-digit binary data starting at index 4 (leftmost digit equals index zero). Multiply the two's complement integer by the scaling factor 63.9990234/2.0^16.0 to get the pressure in inches of mercury. Multiply the pressure by 33.86389 to convert to hectopascals.

'''Aircraft Altitude'''

Calculate the two's complement integer from the 17-digit binary data starting at index 3 (leftmost digit equals index zero). Multiply the two's complement integer by the scaling factor 131071.0/2.0^17.0 to get the altitude in feet. Multiply the altitude by 0.3048 to convert to meters.

'''Mach Number'''

Calculate the two's complement integer from the 16-digit binary data starting at index 4 (leftmost digit equals index zero). Multiply the two's complement integer by the scaling factor 4.096/2.0^16.0 to get the unit-less mach number.

'''(Indicated) Airspeed'''

Calculate the two's complement integer from the 14-digit binary data starting at index 6 (leftmost digit equals index zero). Multiply the two's complement integer by the scaling factor 1023.75/2.0^14.0 to get the airspeed in knots.  Multiply the airspeed by 0.5144447 to convert to meters per second.

'''Maximum Operating Speed'''

Calculate the two's complement integer from the 12-digit binary data starting at index 8 (leftmost digit equals index zero). Multiply the two's complement integer by the scaling factor 1024.00/2.0^12.0 to get the airspeed in knots.  Multiply the airspeed by 0.5144447 to convert to meters per second.

'''True Airspeed'''

Calculate the two's complement integer from the 15-digit binary data starting at index 5 (leftmost digit equals index zero). Multiply the two's complement integer by the scaling factor 12048.0/2.0^15.0 to get the airspeed in knots.  Multiply the airspeed by 0.5144447 to convert to meters per second.

'''Total Air Temperature'''

Calculate the two's complement integer from the 11-digit binary data starting at index 9 (leftmost digit equals index zero). Multiply the two's complement integer by the scaling factor 511.75/2.0^11.0 to get the total air temperature in degrees Celsius.  

'''Aircraft Vertical Speed'''

Calculate the two's complement integer from the 11-digit binary data starting at index 9 (leftmost digit equals index zero). Multiply the two's complement integer by the scaling factor 32752.02.0^11.0 to get the aircraft vertical speed in feet per minute. Multiply the vertical speed by 0.3048/60.0 to convert to meters per second.

'''Static Air Temperature'''

Calculate the two's complement integer from the 11-digit binary data starting at index 9 (leftmost digit equals index zero). Multiply the two's complement integer by the scaling factor 511.75/2.0^11.0 to get the static air temperature in degrees Celsius. 

'''Various Diagnostic Parameters'''

Calculate the two's complement integer from the 20-digit binary data starting at index 0 (leftmost digit equals index zero). Multiply the two's complement integer by the scaling factor 180.0/2.0^20.0 to get the physical floating-point equivalent.