Recursive processing of multiple intensity-modulated scans

A recursive signal processing apparatus comprising in combination:

• a range determining means receiving an input signal, said input signal being scanned by said range determining means at a predetermined rate, said range determining means displaying a range scan, said range scan including said input signal and a synch pulse, said range scan being repetitive, said input signal containing at least one data pulse therein, said range determining means providing a range signal and a range gate output,
• a computing means receiving said range gate output from said range determining means, said computing means computing a weighting factor for each input signal, said computing means comparing said range gate output with said weighting factor, said computing means providing a weight data output,
• a memory means receiving said range signal from said range determining means, said memory means storing said range signal to provide a stored range signal to said range determining means, said range determining means comparing said input signal with said stored range signal to provide said range gate output, said memory means receiving said weight data output from said computing means, said memory means storing said weight data output to provide a stored data weight to said computing means, said computing means computes (1 - n.alpha.) times the stored data weight and retains this weight for the present input signal if the new product is greater than previously stored weights, and,
• a control means to provide strobe and control signals to said range determining means and said computing means, said control means being connected to said memory means to control the acquisition of said range signal and said weight data output, said control means controlling the transmission of said stored range signal to said ranging determining means and said stored data weight to said computing means, said control means controlling the comparison operation within said range determining means and the multiplication and comparison process within said computing means.