The DREGON dataset is introduced and described in the following IROS 2018 paper:
DREGON: Dataset and Methods for UAV-Embedded Sound Source Localization, Martin Strauss, Pol Mordel, Victor Miguet and Antoine Deleforge, IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS) 2018. 
The IEEE Signal Processing Cup 2019 competition and data are described in the following IEEE Signal Processing Magazine article:
Audio-Based Search and Rescue With a Drone: Highlights From the IEEE Signal Processing Cup 2019 Student Competition Antoine Deleforge, Diego Di Carlo, Martin Strauss, Romain Serizel, Lucio Marcenaro, IEEE Signal Processing Magazine 36 (5), 2019.