New indoor positioning system using ultrasonic

An ultrasonic indoor positioning system is described in this article, which can achieve centimeter-level precision in the location of moving objects indoors. The entire system requires transmitting nodes, receiving nodes, and a display control terminal. The system uses a code division multiplexing access method and is based on long-baseline positioning technology. Because the system operates in the up-transmit-down-receive mode, there is no limit to the number of receiving nodes. The ultrasonic Time of Arrival ranging method is used to locate a receiving node. At least four or five transmitting nodes are required to accurately calculate placement. When the height is greater than 3 meters, the working radius must be less than 5 meters. For multiuser identification and slant range measurement, the system employs wideband pseudorandom noise signals known as "gold" sequences. The article begins with a brief overview of common indoor ultrasonic locating methods, followed by a description of the proposed algorithm's theory and simulation results. The practical implementation and experimental results are also included in the article to examine the correctness and practicality of the approach.