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In the current scenario location estimation is a very challenging field in case of WSN, as the utility is very high in the WSN application with respect to various aspects. So, a simulation based survey is carried out in this paper using three mostly used range based techniques likely RSSI, TOA & AOA, where the nodes are assumed to be static at the time of computation of their respective locations and some reference nodes are also considered for helping the location calculation, whose coordinates are known prior to the computation and is stored in the sensor nodes database. General Terms Wireless Sensor Networks, Location Estimation, Simulation, Survey. Keywords Location Estimation, Range Based, Anchor Based, RSSI, TOA, AOA anchor based & range based, set up in a common environment 1. INTRODUCTION Determining the location of a mobile device (cellular phone, user, sensor nodes/motes, and autonomous robots) is a fundamental problem in mobile computing. Being aware of the location of a device could either improve the performance of a communication network, or it could also be used to implement services relying on location information e.g. Location Based Services [1] etc. Wireless location services provide personalized services to mobile users based on their current location. The promise of new wireless location services heavily relies on accurate & efficient location detection

Performance Evaluation of Anchor-based Range-based Localization Systems in Wireless Sensor Networks