2 research outputs found
Passive localization model in wireless sensor networks based on adaptive hybrid heuristic algorithms
ΠΡΠ΅Π΄ΠΌΠ΅Ρ ΠΈΡΡΡΠ°ΠΆΠΈΠ²Π°ΡΠ° ΠΎΠ²Π΅ Π΄ΠΎΠΊΡΠΎΡΡΠΊΠ΅ Π΄ΠΈΡΠ΅ΡΡΠ°ΡΠΈΡΠ΅ ΡΠ΅ ΠΏΡΠΎΠ±Π»Π΅ΠΌ ΠΏΠ°ΡΠΈΠ²Π½ΠΎΠ³ Π»ΠΎΡΠΈΡΠ°ΡΠ° Π·Π°ΡΠ½ΠΎΠ²Π°Π½ Π½Π° ΠΌΠ΅ΡΠ΅ΡΡ Π²ΡΠ΅ΠΌΠ΅Π½Π° ΠΏΡΠΎΠΏΠ°Π³Π°ΡΠΈΡΠ΅ ΡΠΈΠ³Π½Π°Π»Π° (Time of Arrival, Π’ΠΠ), ΠΈΠ»ΠΈ Π²ΡΠ΅ΠΌΠ΅Π½ΡΠΊΠ΅ ΡΠ°Π·Π»ΠΈΠΊΠ΅ ΠΏΡΠΎΠΏΠ°Π³Π°ΡΠΈΡΠ΅ ΡΠΈΠ³Π½Π°Π»Π° (Time Difference of Arrival, TDOA) ΡΠ°Π΄ΠΈ ΠΎΠ΄ΡΠ΅ΡΠΈΠ²Π°ΡΠ° Π½Π΅ΠΏΠΎΠ·Π½Π°ΡΠ΅ Π»ΠΎΠΊΠ°ΡΠΈΡΠ΅ Π½Π΅ΠΊΠΎΠ³ ΠΎΠ±ΡΠ΅ΠΊΡΠ°. ΠΠ° ΠΏΠΎΡΡΠ°Π²ΡΠ΅Π½Π΅ ΠΌΠΎΠ΄Π΅Π»Π΅ Π»ΠΎΡΠΈΡΠ°ΡΠ° ΡΠΎΡΠΌΠΈΡΠ°Π½Π° ΡΠ΅ ΡΡΠ½ΠΊΡΠΈΡΠ° ΠΌΠ°ΠΊΡΠΈΠΌΠ°Π»Π½Π΅ Π²Π΅ΡΠΎΠ΄ΠΎΡΡΠΎΡΠ½ΠΎΡΡΠΈ (Maximum Likelihood, ML) ΡΠ° ΠΠ°ΡΡΠΎΠ²ΠΎΠΌ ΡΠ»ΡΡΠ°ΡΠ½ΠΎΠΌ ΡΠ°ΡΠΏΠΎΠ΄Π΅Π»ΠΎΠΌ Π·Π° Π³ΡΠ΅ΡΠΊΡ ΠΌΠ΅ΡΠ΅ΡΠ°. Π Π°Π·ΠΌΠ°ΡΡΠ°Π½ΠΈ Π΅ΡΡΠΈΠΌΠ°ΡΠΈΠΎΠ½ΠΈ ΠΌΠΎΠ΄Π΅Π» ΠΎΠΏΠΈΡΠ°Π½ ΡΠ΅ Π½Π΅Π»ΠΈΠ½Π΅Π°ΡΠ½ΠΎΠΌ, Π½Π΅ΠΊΠΎΠ½Π²Π΅ΠΊΡΠ½ΠΎΠΌ ΡΡΠ½ΠΊΡΠΈΡΠΎΠΌ ΡΠΈΡΠ°, ΠΎΠ΄Π½ΠΎΡΠ½ΠΎ ΠΌΡΠ»ΡΠΈΠΌΠΎΠ΄Π°Π»Π½ΠΎΠΌ ΡΡΠ½ΠΊΡΠΈΡΠΎΠΌ. ΠΡΠΈ ΡΠΎΠΌΠ΅, Π·Π° ΡΠΎΡΠΌΠΈΡΠ°Π½Ρ ΡΡΠ½ΠΊΡΠΈΡΡ ΡΠΈΡΠ°, Π³Π»ΠΎΠ±Π°Π»Π½ΠΎ ΠΎΠΏΡΠΈΠΌΠ°Π»Π½ΠΎ ΡΠ΅ΡΠ΅ΡΠ΅ Π½Π΅ ΠΌΠΎΠΆΠ΅ ΡΠ΅ Π½ΡΠΌΠ΅ΡΠΈΡΠΊΠΈ ΠΎΠ΄ΡΠ΅Π΄ΠΈΡΠΈ ΠΊΠ»Π°ΡΠΈΡΠ½ΠΈΠΌ ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠ° ΠΎΠΏΡΠΈΠΌΠΈΠ·Π°ΡΠΈΡΠ΅...The research in this dissertation is focused on the problem of passive target localization based on the noisy time of arrival (TOA) or time Difference of Arrival (TDOA) measurements, with the aim to accurately estimate the unknown passive target location. The maximum likelihood (ML) estimation problem is formulated for the considered localization problem, with measurement errors modelled as Gaussian distributed random variables. However, the ML objective function of the considered estimation problem is nonlinear and multimodal function, and in this case, the global optimal solution cannot be determined numerically by classical optimization methods..