The error analysis of TDOA based ultrasonic position
AngGao1, Yansu Hu2,WeijunDuan1
1School of Electronics and Information, NorthwesternPolytechnical University, No.127, West Youyi Road, Xi'an, China
2School of Electronics and Control Engineering,Chang'an University,Southern Middle Section of the Second Circular Road, Xi'an, China
How to enhance the accuracy and range is a typical issue in the ultrasonic position technology. The positionaccuracy depends on the hardware architectureand the detecting methods. This paper designs a hardware platformcalled Hexagon-Buck with six transceivers around. For theinherent property of TDOA (Time of Difference of Arrival) ranging, theRF synchronous time and embedded software processing timeare two inevitable factors that leads to the distance error. At the same time,the ultrasonic velocity is sensitive to the environment temperature. The paper considers both the temperature compensationand Least Squares Linear Regression to enhance the rangingaccuracy. By taking the physical test data to identify thelinear regression model, we can estimate thereal distance. The validity of the method has been proved by the final experiment.