Patent ID: 8279111

Claim:
A distance measuring system comprising: a transmitting device having transmission means that transmits a pulse sequence as a radio wave, and reception means that receives the pulse sequence returned; and a return device having return means that receives the pulse sequence transmitted as a radio wave from the transmitting device and returns the pulse sequence to the transmitting device, operation means that calculates a return delay time from reception of the pulse sequence to returning of the pulse sequence, and notification means that notifies the transmitting device of the return delay time calculated by the operation means, and further including: relative time difference calculating means that acquires a relative time difference between the transmitting device and the return device for an oscillator which generates the pulse signals by counting a number of pulse signals constituting the pulse sequence received via the reception means; and distance calculating means that acquires an arrival time from transmission of one pulse signal constituting the pulse sequence by the transmission means to reception of the pulse signal by the reception means, calculates a distance from the return device based on the return delay time notified by the notification means and the acquired arrival time, and corrects the calculated distance based on the relative time difference calculated by the relative time difference calculating means.