Study on distance and angle measurement for single-base-station UWB positioning system with circular antenna array

A single-base-station ultra-wideband (UWB) positioning system with a circular antenna array is given in this study. MUSIC algorithm and pulse amplitude measurement are employed to achieve accurate distance and angle measurement for precise positioning. Compared with the traditional correlation function algorithm in dense multipath environments, MUSIC algorithm has high multipath resolution capability and high noise immunity. It can get accurate values of time of arrival (TOA) by detecting multipath signals. Then the precise distance can be obtained. Since the angle of arrival (AOA) of the received signal is a variable of the antenna gain function of circular antenna array, we can simply measure the pulse amplitudes of the received signals to calculate AOA values. Simulation results show that MUSIC algorithm can detect the first path precisely in the indoor line-of-sight (LOS) environment, which improves the accuracy of the distance measurement. And the pulse amplitude measurement is also an effective way to achieve high precise angle measurement.