FM超音波音源の方向検知・追尾システム

抄録

An ultrasonic tracking subsystem, utilizing a frequency modulated wave, has been developed for use in an ultrasonic control system of access to the submerged object. The principle of the subsystem is based on the modified ultra-short base line method, that is, the measurement of the incident angle of the frequency modulated wave to the receiving array is accomplished by detecting the phase difference between the sinusoidal waves of low frequency demodulated from the received signals of high frequency. Initial studies and laboratory experiments in air indicate an accuracy of about±1^.in turning the array to the direction of the source.