Signal processing apparatus

摘要

The apparatus comprises inputs 13,14 for receiving at least the transmitted pulse signal and the received reflected signal. Signal analysing means 23 is provided for analysing at least some of the characteristics eg. pulse length of the transmitted pulse signal and to vary the operation of the apparatus in dependence thereon. Another apparatus comprises means for detecting the pulse length of the transmitted signal as an indication of the likely bandwidth of the reflected signal, and means for filtering the reflected signal with a band pass filter the pass band of which is varied in dependence on the anticipated bandwidth of the reflected signal. This improves the signal-to-noise ratio of the received reflected signal for further processing.