The effect of energy measurements on improving the range and bearing estimation in a hybrid energy and TDOA localization system

This paper investigates the use of energy measurements to improve the localization accuracy in terms of range and bearing in a TDOA based system. We first extend the hybrid energy and TDOA localization algorithm in Cartesian coordinate that is proposed in (Ho and Sun, 2008) to obtain the range and bearing estimates of an emitting source. The accuracy of the range and bearing estimates is then examined with respect to the noise level in the energy measurements relative to that in TDOAs. For comparison purpose, the CRLB for the range and bearing estimates is also derived. We find that energy measurements improve more the accuracy in range than in bearing. Regarding the bearing estimation, the energy measurements provide more improvement for a near-field source than for a far-field source.