"N. Thong-un,S. Saito,S. Hirata,Y. Orino,M. K. Kurosawa","Two-Dimensional Airborne Position and Velocity Measurements Using a Pair of Linear-Period-Modulated Ultrasonic Waves",,"Acta Acustica united with Acustica","Elsevier","Vol. 102","No. 4","pp. 688-695",2016,July