In addition, the echo canceller performs line echo cancellation, far end echo cancellation, acoustic echo cancellation, and fax/data tone detection.

The echoes of the first group are sorted into clusters, with the clusters being defined as echoes from adjacent positions of the plurality of positions.

The method may be further improved by modeling real and spurious echoes and subtracting these echoes from the echoes generated in the loop.

to clutter a radar display

At least some of the detected echoes are associated with individual positions of the plurality of positions that triggered the detected echoes.

A multi-dimensional array (12) receives reflected echoes.

The image data is classified to determine whether the image data includes relatively low clutter or relatively high clutter.

Echoes are induced by the sonic energy, and detected.

The method also includes combining the image echoes.

A device and method of using the device for the detection of objects within structures or environments of interest is disclosed which utilizes ultrasonic signals and echoes for said detection.

We have them running them in knee-deep snow, we have them running in hundred degree weather.

A receiver 18 receives echoes 20 from the item 12.

In an embodiment, a series of 180 degree pulses produces alternating stimulated and stimulated anti-echos that are measured and assigned to respective images.

The signal is then processed in digital filters to remove the ghosts.

The echoes are combined on a spatial basis with echoes from different look directions which correspond to the same spatial location being combined.