The development of sensor nodes in wireless sensor network is usually not regular. It makes sense when the sensed information of sensor must contain the location of nodes. Therefore, the positioning of the sensor nodes becomes an important issue. This paper uses RSSI value of reference nodes to implement positioning system in an indoor parking lot. It overcomes the effects of RSSI drift lead to poor positioning accuracy. The experimental development of the CC2430/CC2431 wireless positioning system is used in the parking lot. The experimental results show that the method of the proposed algorithm can effectively reduce the positioning error caused due to the RSSI drift effect.
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