| 摘要 |
PCT No. PCT/EP90/00894 Sec. 371 Date Jan. 3, 1991 Sec. 102(e) Date Jan. 3, 1991 PCT Filed Nov. 2, 1989 PCT Pub. No. WO91/06874 PCT Pub. Date May 16, 1991.A method is disclosed in which the direction and range of sound generating targets (2) is determined solely by means of passive sensors (10, 11). In this connection it is proposed to employ a seismic sensor (10) in addition to the acoustic sensors (11) customarily required for a bearing angle determination. In this case, a line characteristic of the signal source of the target (2) is measured in the airborne sound spectrum as well as in the solid-borne sound spectrum and the radial target velocity (Vz,r) is determined from the Doppler shift of these lines and the propagation velocity (C) of the corresponding waves and, under consideration of the bearing angle ( alpha ), the target range (r) is calculated therefrom.
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