Detecting and localizing impulsive acoustic sources in the daytime using distributed elevated acoustic sensors with large
baseline separations has distinct advantages over small ground-based arrays. There are generally two reasons for this:
first, during the daytime, because of more direct and less encumbered propagation paths, signal levels are generally
larger at altitude than near the ground. Second, larger baselines provide improved localization accuracy. Results are
reported from a distributed array of acoustic sensors deployed during an experiment near Bourges, France during June of
2008. The distributed array consisted of microphones and GPS receivers attached to the tether lines of three widely
separated aerostats. The sound sources were various impulsive devices. Results from the measurements are presented
and discussed. Localization errors (GPS accuracy, propagation calculation, and aerostat motion, etc) are discussed.
Possible ways to improve the localization accuracy are suggested.