Prototype of the Selective Calling System (SELCAL)
DOI:
https://doi.org/10.52428/20758944.v20i56.1170Keywords:
SELCAL, prototype, ESP32, communication, aircraftAbstract
In this work, the hardware modeling of the SELCAL communication system corresponding to ATA 23 of the aircraft communications system, which is present in all aircraft, was carried out. This system aims to discriminate calls made from a ground SELCAL through radio frequency signals, using a 16-bit binary code composed of 4 unique characters for each aircraft. If the call is directed to a specific onboard station, the character code configured on the aircraft must match the code marked on the ground station, triggering an audible and visible alert for the crew.
For the development of the prototype, the open hardware platform ESP32 was used, which enabled the creation of a functional model with specific characteristics. A graphical software interface was designed using Microsoft Windows Forms for the emitter at the ground station, and a hardware interface with LEDs and dip-switches to configure the binary code of the receiver. As a result, a transmitter on the ground and a SELCAL reception system onboard the aircraft were implemented, with an effective binary configuration, allowing even the interaction of multiple SELCAL systems in the air. However, the prototype only covers the first alphanumeric code of the four that make up the conventional code of a commercial aircraft.
The prototype has allowed the modeling of the basic structure of the SELCAL system, and it was highlighted that the use of the ESP32 is suitable for this type of application, due to its extensive wireless capabilities. The connection between Windows Forms and the ESP32 through the serial port facilitates direct interaction with the hardware, allowing flexible configuration of the terminals and execution of different scenarios. Although limitations were identified regarding the number of codes that can be handled, this model serves an educational function, providing a platform that allows students to interact with current technology, thus opening opportunities for future research and improvements in aircraft communication systems.
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