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To obtain location info is the precondition for more and more applications. Reliable and accurate positioning for users requires a local replacement for satellite navigation. The ultra-wideband (UWB) impulse radio system is particularly suitable for such local systems. Indoor localization using multiple antenna time different of arrival (TDOA) estimation techniques and time-hopping impulse radio system and signals at the receiver perform a filtering matched to the antipodal pulse amplitude modulation (A-PAM) template sequence is concentrated on the paper. Transmitted pulses are distorted by receive antenna, other system components such as filters and amplifiers, and the multipath environment, so the challenge of realize high resolution depends on accurate time of arrival estimation at receiver antennas. The computer simulation gives localization results by means of RMS errors are 7.69 cm, 8.5 cm 35.11 cm under AWGN and IEEE 802.15.3a CM1, CM3 emulational indoor environments on a 10×10 meter square area.