| 摘要 |
<p>The present invention relates to a high resolution distance measuring method by phase shifted value of ultrasonic signal, capable of measuring distance precisely as a distance correction value is computed through a phase shifted value between synchronized ultrasonic signals and transmission synchronization signal. The present invention comprises the following steps: a signal measuring step of computing time of flight (TOF), time consumed for ultrasonic signal to get a certain object from a standard location, by an ultrasonic waves receiver and a signal analyzer and of outputting ultrasonic signal inputted to a certain object from the standard location from an ultrasonic transmitter; and a computing step of computing a simple computation distance (d) for the standard location of the certain object from the TOF measured at the signal measuring step and the speed of signal (c) inputted to the certain object. The present invention measures a distance of the certain object from a standard location. The signal measuring step produces pulse shaped transmission synchronization signals at each start point of every period of ultrasonic signals inputted to the certain object. Also, the present invention transmits transmission synchronization signals to the ultrasonic receiver located at the standard location or certain object by a wired/wireless communications. In addition, the present invention extracts the phase shifted value, by the signal analyzer, between the ultrasonic signals and transmission synchronization signals received by the ultrasonic receiver. The distance computing step produces a distance correction value (m) from the extracted phase shifted value and computes a precise correction distance (d′) in which the distance correction value (m) is added to the simple computation distance (d) for the standard location of the certain object.</p> |
