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This paper introduces the technology Time of Arrival (TOA) based on chirp pulses (according to IEEE 802.15.4a)  as a means to perform localization in Wireless Sensor Networks (WSN's) active at 2.4 GHz. Advantages and disadvantages  of the technology are discussed and act as a guideline for improving localization accuracy. Tests concerning TOA  are performed by means of the location engine of Nanotron. Adapting this engine leads to improved localization results.  It is shown that TOA measurements are susceptible to reflections and dynamic environments

Time of Arrival Based on Chirp Pulses as a means to Perform Localization in IEEE 802.15.4a Wireless Sensor Networks