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We consider the problem of sensor node localization in a randomly deployed sensor network, using a mobile access point (AP). The mobile AP can be used to localize many sensors simultaneously in a broadcast mode, without a preestablished sensor network. We consider a multi-modal approach, combining radio and acoustics. The radio broadcasts timing, location information, and acoustic signal parameters. The acoustic emission may be used at the sensor to measure Doppler stretch, time delay, anddoi:10.1109/icassp.2005.1416118 dblp:conf/icassp/SadlerKT05 fatcat:atkbdzlqtrbyxcieicbyqjwqni