New method for ultrasonic absolute localization

The precision of the traditional ultrasonic localization method is limited due to unsufficiently precise estimation of the sound velocity and the time of flight (TOF), therefore, a new method, the special fusion method for redundancy ultrasonic information (SFMRUI) was proposed to solve the precision problem. SFMRUI uses the geometric relationships among the redundant information and the implicit relationships between the redundant information and the error to correct the error It is possible to eliminate the error of TOF, to calculate the wave lagging error and to estimate the measurement accuracy by SFMRUI. The experiments and simulations were performed and their results proved that the SFMRUI is correct and effective to improve the absolute localization accuracy. The proposed method is superior obviously to the traditional method and the time difference method.