Nowadays, the issues concerning wireless sensors nodes localization estimation is still a matter of research interest. This is driven by the complexity and the diversity of current and future wireless sensor networks applications. Several single schemes have been proposed and studied for location estimation, each with its own advantages and limitations. Furthermore, a number of hybrid schemes have been also proposed for the sake of generality and diversity of applications and the limitations of

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... the single schemes. Some of the hybrid solutions combine measurements from more than a single technique to improve the estimation accuracy by employing data fusion. This paper presents a survey of single and fusion based hybrid location techniques.