  In this paper, an efficient deployment strategy is proposed for a network of
mobile and static sensors with nonidentical sensing and communication radii.
The multiplicatively weighted Voronoi (MW-Voronoi) diagram is used to partition
the field and assign the underlying coverage task to each mobile sensor. A
gradient-based method is applied to find the best candidate point based on the
detected coverage holes and the coverage priority considering the relative
distance of the mobile sensor from the static ones and the obstacles in the
field. The sensors move to a new position if such a relocation increases their
local coverage. The efficiency of the proposed strategy in different scenarios
is demonstrated by simulations.
