Patent ID: 7424405

Claim:
A method for signal processing for a target detecting device comprising the steps of: receiving a return signal from a transmitted first coded pulse by means of a signal processing arrangement; compressing the return signal in a first compression filter giving rise to a first compressed signal; compressing the return signal in a second compression filter parallel to the first compression filter giving rise to a second compressed signal, wherein; the second compression filter compresses the return signal to a higher degree than the first compression filter, wherein a delay ΔT between the first compressed signal and the second compressed signal arises due to the difference in compression between the first and the second compression filter; a delay filter delays the first compressed signal compensating for the delay ΔT; a first detector processes the delayed first compressed signal by forming the squares or absolute value of the delayed first compressed signal, giving rise to a first detector signal; a second detector processes the second compressed signal by forming the square or absolute value of the second compressed signal, giving rise to a second detector signal; the first detector signal is compared to the second detector signal for all corresponding time frames, and that; the minimum value of the compared detector signals is selected for all time frames, giving rise to a first output signal comprising the minimum values from the first and second detector signals.