抄録
A linear-period-modulated (LPM) signal is a well known means used by some species of echolocating mammalian such as bats and cetaceans.
In an acoustical measurement method detecting many moving objects, the LPM signal is free from the range-Doppler coupling if constructed symmetrically with respect to time reversal. Therefore, transmitting the LPM signal and recording the time variations of echoes by a sensor array, both objects positions and velocity vectors can be reconstructed in good accuracy.
In this paper, the theory of velocity estimation by means of the LPM signal is described and is extended to a two-dimensional case with a Linear sensor array. Furthermore a new method to reconstruct objects velocity vectors by using orthogonal correlation detectors is proposed. The validity of this method is confirmed by the experiment in air with the linear sensor array composed of a transmitter and 8 receivers. The estimated velocity vectors agree well with those of actual object motions.
