Abstract:

Accuracy of traditional methods for positioning the node under the low positioning accuracy problem, discussion and study of the WSN (Wireless Sensor Network) network node positioning accuracy problem, based on RSSI (Received Signal Strength Indicator) wireless sensor network positioning technology,by analyzing the two-dimensional location parameter estimation CRB (Cramr- Rao Bound) value, compared to traditional positioning methods and collaborative approach of the location estimate, put forward a set threshold of collaborative positioning methods. This method is some node positioning in the traditional manner, while some nodes in the collaborative approach of positioning. Matlab simulation results show that the positioning method can improve the positioning accuracy of network nodes.

Key words: wireless sensor networks, relative location estimation, received signal strength indicator, cramr-rao bound, fisher information matrix, cooperative positioning