{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,7]],"date-time":"2026-01-07T08:04:52Z","timestamp":1767773092273,"version":"build-2065373602"},"reference-count":38,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2020,11,18]],"date-time":"2020-11-18T00:00:00Z","timestamp":1605657600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>We present a novel hybrid localization algorithm for wireless sensor networks in the absence of knowledge regarding the transmit power and path-loss exponent. Transmit power and the path-loss exponent are critical parameters for target localization algorithms in wireless sensor networks, which help extract target position information from the received signal strength. In the absence of information on transmit power and path-loss exponent, it is critical to estimate them for reliable deployment of conventional target localization algorithms. In this paper, we propose a simultaneous estimation of transmit power and path-loss exponent based on Kalman filter. The unknown transmit power and path-loss exponent are estimated using a Kalman filter with the tentatively estimated target position based solely on angle information. Subsequently, the target position is refined using a hybrid method incorporating received signal strength measurements based on the estimated transmit power and path-loss exponent. Our proposed algorithm accurately estimates transmit power and path-loss exponent and yields almost the same target position accuracy as the simulation results confirm, as the hybrid target localization algorithms with known transmit power and path-loss exponent. Simulation results confirm the proposed algorithm achieves 99.7% accuracy of the target localization performance with known transmit power and path-loss exponent, even in the presence of severe received signal strength measurement noise.<\/jats:p>","DOI":"10.3390\/s20226582","type":"journal-article","created":{"date-parts":[[2020,11,18]],"date-time":"2020-11-18T07:41:00Z","timestamp":1605685260000},"page":"6582","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Target Localization with Unknown Transmit Power and Path-Loss Exponent Using a Kalman Filter in WSNs"],"prefix":"10.3390","volume":"20","author":[{"given":"SeYoung","family":"Kang","sequence":"first","affiliation":[{"name":"Division of Computer and Communications Engineering, Korea University, Seoul 02841, Korea"}]},{"given":"TaeHyun","family":"Kim","sequence":"additional","affiliation":[{"name":"Agency for Defense Development, Daejeon 34186, Korea"}]},{"given":"WonZoo","family":"Chung","sequence":"additional","affiliation":[{"name":"Division of Computer and Communications Engineering, Korea University, Seoul 02841, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2020,11,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1109\/JSEN.2013.2278864","article-title":"Optimized low complexity sensor node positioning in wireless sensor networks","volume":"1","author":"Salman","year":"2014","journal-title":"IEEE Sens. 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