The Research Of Indoor Wireless Communications Location Technology For Ir-uwb

Ultra-wideband technology has obtained the field widespread attention, especially after the ultra-wideband technology is approved of being employed in civil productions. The ultra-wideband system makes use of ultra-short duration pulses, which yields ultra-wideband signals characterized by extremely wide frequency band and can submerge in noise. Those entire make the ultra-wideband system has a broad application prospect no matter in civil productions or in military productions.A combination of communication and localization, and the high resolution characteristic make the ultra-wideband technology widely used in the indoor localization system. The indoor environment has the serious multipath disturbance for the object reflection, refraction or object migration influence, which results in the difficult high accuracy localization. Precise localization is based on the accurate delay estimation. But the multipath can induce the overlapped multipath, which makes the first arrival time obtain difficult. The non-line-of-sight in the environment can also induce the positive error in delay estimation. After obtaining the localization delay, the localization algorithms use the original outdoor localization algorithm mostly, which makes the localization accuracy is difficult to satisfy the indoor localization request.Firstly, the most important thing of the ultra-wideband impulse signal localization is how to gain the delay estimation. According to the indoor channel environment characteristics, introduce the high resolution delay estimation algorithm which is based on the MUSIC algorithm, and propose an improved algorithm which combines the receiver structure algorithm MES-SB. Simulation results show the improved algorithm reduces the algorithm complexity greatly with the high accuracy delay estimation. The gained localization delay can induce the lower localization accuracy for the non-line-of-sight error. This thesis systemic analyzes the mitigation methods of the non-line-of-sight error in the ultra-wideband indoor localization system.Secondly, the localization delay which is gained by the high resolution uses the time difference of arrival localization algorithm and the localization solution uses the Taylor algorithm which has the strong robust characteristic. For the non-line-of-sight error, the localization algorithm should consider the non-line-of-sight error mitigation and the convergence of Taylor algorithm. So this thesis firstly proposes a cooperative localization algorithm which combines the WLS algorithm with the correction factor and has the non-line-of-sight mitigation ability. Simulation results show the localization accuracy is high, but the complexity is also high. Then the thesis proposes other low complexity algorithm, which also has the non-line-of-sight mitigation ability. That is the residual weighting initial value localization algorithm. Simulation results show the algorithm accuracy is lower than the improved cooperative localization algorithm, but it also can satisfied basically the accuracy request of indoor localization.