In the past few years

inland coal mine accidents are always reported to the public.So protecting mine workers from danger and the research of underground detecting system becomes more and more important.A kind of underground wireless localization scheme is put forward based on CC2420.In this scheme RSSI value is used for ranging and unknown nodes are located according to the beacon node with fixed position

which based on hardware nodes made up with CC2420 and ATmega128.When unknown nodes receive several beacon node’s information

the estimate position can be averaged on math in order to improve location accuracy.At the same time

some situation such as location failure for the range error is also discussed in the scheme.Simulation results demonstrate that the scheme is a simple fast underground practicable location scheme in the condition of good networks’connection.