Dedopplerisation - A means of improving imagery from acoustic sources whose motion is known

A method which can be used to correct signals from moving acoustic sources received by fixed microphones for the Doppler effect (dedopplerization) is presented. The approach makes use of the properties of the wave propagation equation for the far field and assumes that the motion of the source is known. Dedopplerization improves the frequency resolution of the radiation diagram and the frequency and spatial resolution of the image. Results of tests in which this procedure was applied to a point source moving at 40 m/sec and to noise emitted by the turbojet engine of the Airtrain 02 are reported.