Abstract

A sensor network i a large ad hoc network of densely diN tri buted sensors that are equi pped wi th low power wi reless transcei ers. Such networks can be appli9 for cooperati e si gnal detecti on, moni tori ng, and tracki ng, and are especiN3N useful for appli(# i s i remote or hazardous locati ons. Thi s paper addresses the problem of locati on di scovery at the sensor nodes, whi chi s one of the central desi gn challengesi n sensor networks. We present a new method by whi ch a sensor node can determi nei ts locati on by li steni ng to wi93)fi4 transmi9CM( s from three or more fixed beacon nodes. The proposed methodi s based on an angle-of-arri al esti mati on techni que that does noti ncrease the complexi ty or cost of constructi on of the sensor nodes. We present the performance of the proposed method obtai ed from computer si ulati ons. Categories and Subject Descriptors B.8.2 [Hardware]: Performance Analysi s and Desi gnAi ds; I.1.4 [Symb olic and Algeb raic Manipulations]: Appli cati ons; D.2.2 [Software Engineering]: Desgi Tools and Techni ques General Terms Algori hms, Desi9 , Performance Keywords Sensor networks, locali zati on,di recti onal antennas,tri angulati on. 1.