The Basis HALO Measurement and Sensor System (BAHAMAS)

HALO is equipped with a basis sensor system permanently installed at the aircraft, called BAHAMAS (Basic Halo Measurement and Sensor System). BAHAMAS was developed by the  Instrumentation and Data Science Group  of the Flight Experiments Facility of DLR and supports the science projects  on HALO with a basic data set which describes the aircraft state and air data  for the surrounding atmosphere. 

BAHAMAS consists of several components:

• A main data acquisition rack in the rear cabin
• An instrumented box in the  unpressurized nose section
• 6 Total Air Temperature (TAT)  inlets in the aircraft nose section
• An instrumented nose boom
• GPS antennas, a data distribution  network, …..

Concerning the aircraft state parameters, the system directly monitors several avionic systems of the Gulfstream G550  (Air Data System, Flight Management HALO Airflow Sensor Calibration Computer, Inertial Reference System etc.  via ARIC 429) as well as the main aircraft avionic bus ASCB-D.

For the measurement of pressure, temperature, humidity and wind vector
BAHAMAS deploys a set of own sensors:

• An experimental Inertial Reference  System (IRS)
• Temperature sensors in selected TAT  housings
• Humidity sensors in the nose box and in  the main data acquisition rack 
• An airflow sensor with pitot static probe  at the tip of the nose boom