A Method of External Emitters Source Localization with the Aid of a Calibration Emitter
A high-precision algorithm of target localization using external radiation source is proposed based on the auxiliary information of a calibration emitter,since the uncertainty of the sensor position can significantly affect the target localization performance.First,the position error of the receiving stations is reduced by using the observation information of the calibration emitter,and the statistical characteristic of the position error is estimated.Then,the high-precision target localization solution is realized by adopting the optimized two-step weighted least squares method and combining with the statistical information of the prior sensors position error.Theoretically,the algorithm is asymptotically effective through the derivation of the Cramer-Rao lower bound.The simulation results indicate that with the aid of the calibration emitter,the algorithm can effectively reduce the influence of the sensor position error on the target localization performance,and significantly improve the accuracy of target localization.Moreover,an optimal estimate of the target position can be achieved when the observation error and the sensor position error are relatively small.The algorithm can obtain the analytical solution and does not require iterative computation,resulting in a small computation cost.
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