  We numerically examine the driven transport of an overdamped self-propelled
particle through a two-dimensional array of circular obstacles. A detailed
analysis of transport quantifiers (mobility and diffusivity) has been performed
for two types of channels, {\it channel I} and {\it channel II}, that
respectively correspond to the parallel and diagonal drives with respect to the
array axis. Our simulation results show that the signatures of pinning actions
and depinning processes in the array of obstacles are manifested through excess
diffusion peaks or sudden drops in diffusivity, and abrupt jumps in mobility
with varying amplitude of the drive. The underlying depinning mechanisms and
the associated threshold driving strength largely depend on the persistent
length of self-propulsion. For low driving strength, both diffusivity and
mobility are noticeably suppressed by the array of obstacles, irrespective of
the self-propulsion parameters and direction of the drive. When self-propulsion
length is larger than a channel compartment size, transport quantifiers are
insensitive to the rotational relaxation time. Transport with diagonal drives
features self-propulsion-dependent negative differential mobility. The
amplitude of the negative differential mobility of an active particle is much
larger than that of a passive one. The present analysis aims at understanding
the driven transport of active species like, bacteria, virus, Janus Particle
etc. in porous medium.
