Abstract
In the acoustical engineering such as sonar technique, it is often necessary to remove periodic waves from reflecting signals. The moving target indicator reported here can remove periodic waves with simple circuits. This indicator has two delay lines in its circuit. The input signals are stored repeatedly on these two delay lines in a specified ratios in a pile, respectively. The amplitude of the output signals from the delay lines are processed successively with a specified calculation in order to take out the signals of moving targets. The signal from moving targets can be taken out from reflecting signals and especially would not disappear for a certain time after the stop of the movements of the targets. Some experiments were performed so as to verify the validity of above theories. In these experiments, the results qualitatively agree with the theory. From the results of these experiments, it is found that the moving target indicator designed in this paper is useful in the acoustical engineering and etc.
