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Localization is important for self-configuring sensor networks. One of the core tasks of localization is ranging (estimating distances) to reference points. In this paper a radio signal based Time of Flight (ToF) measuring ranging system for wireless sensor networks is proposed, designed and prototyped. The prototype measurement error is within -0.5m to 2m while operating at 100Msps sampling rate and using a 50MHz signal in the 2.4 GHz ISM band. The system accuracy is limited by the samplingdoi:10.1109/icc.2006.255233 dblp:conf/icc/KaralarR06 fatcat:ndribru2w5bnvdra6hz36sz4qm