One embodiment of the system is implemented as an aircraft comprising a
rotor. For example, the aircraft may be a helicopter. This embodiment
also comprises an acoustic source, wherein this acoustic source comprises
an acoustic signature of the aircraft. This particular embodiment also
comprises an acoustic collection device affixed to the aircraft. The
acoustic collection device preferably comprises an array of microphones.
Finally, this embodiment also has a data processing device, such as a
computer, for collecting the data detected by the microphones and
processing this data. In operation, the aircraft is flown for a distance
along a path while the aircraft emits acoustic energy. Then, the
microphones detect the acoustic energy that is reflected off the terrain.
Optionally, the detected energy may be stored as data and processed, so
that noise may be reduced and a terrain image may be formed.