Multiple source localization is an important task in acoustic
signal processing with applications including dereverberation,
source separation, source tracking and environment
mapping. When using spherical microphone arrays, it has
been previously shown that Pseudo-intensity Vectors (PIV),
and Augmented Intensity Vectors (AIV), are an effective approach
for direction of arrival estimation of a sound source.
In this paper, we evaluate AIV-based localization in acoustic
scenarios involving multiple sound sources. Simulations are
conducted where the number of sources, their angular separation
and the reverberation time of the room are varied. The
results indicate that AIV outperforms PIV and Steered Response
Power (SRP) with an average accuracy between 5 and
10 degrees for sources with angular separation of 30 degrees
or more. AIV also shows better robustness to reverberation
time than PIV and SRP.