  We consider the problem of localizing a target taking the help of a set of
anchor beacon nodes.A small number of beacon nodes are deployed at known
locations in the area.The target can detect a beacon provided it happens to lie
within the beacons's transmission range.Thus, the target contains a measurement
vector containing the readings of the beacons: '1' corresponding to a beacon if
it is able to detect the target and '0' if the beacon is not able to detect the
target.The goal is two fold: to determine the location of the target based on
the binary measurement vector at the target and to study the behavior of the
localization uncertainty as a function of the beacon transmission range and the
number of beacons deployed.Beacon transmission range means signal strength of
the beacon to transmit and receive the signals which is called as Received
Signal Strength.To localize the target, we propose a grid mapping based
approach, where the readings corresponding to locations on a grid overlaid on a
region of interest are used to localize a target.To study the behavior of the
localization uncertainty as a function of the sensing radius and number of
beacons,extensive simulations and numerical experiments are carried out.The
results provide insights into an importance of optimally setting the sensing
radius and the improvement obtainable with increasing number of beacons.
