A Better Range-Free Localization Algorithm in Wireless Sensor Networks
Localization is a fundamental issue for many applications in wireless sensor networks. This paper proposes a better range-free algorithm based on DV-Hop, which increases localization accuracy without increasing hardware or communication costs. First, this algorithm utilizes average hop-size correction to reduce ranging errors. Second, the algorithm uses an improved equation solving method to reduce the impact of errors inherent in distance measurement, and the weighted least square method to improve localization accuracy. Finally, the algorithm uses additional information in the equation solving process to correct node coordinates. Simulation results show that the performance of the proposed algorithm is significantly better than the basic DV-Hop algorithm and other similar algorithms.