Range finder and method for range finding by using light pulses

Details Range finder and method for range finding by using light pulses Range finder and method for range finding by using light pulses

G - Physics

01

S

343/5

G01S 17/10 (2006.01)

Patent

CA 1287149

ABSTRACT A method for range determination between a transmitter receiver and a target using optical pulse signals is described, which only requires extremely low transmission pulse energy, but still has a much higher sensitivity or interference suppression than conventional methods. For this purpose, optical pulse groups with a pulse rate in the range approximately 10 to approximately 150 kHz are directed onto the target. The reflected and received signal sequence is scanned with a scanning frequency dependent on the transmission pulse rate and digitized. The scan values obtained are then continuously added to the corresponding value for each individual transmission pulse with the clock of the scanning frequency. The ranging information is derived from the resulting signal. Preferably the scanning of the incoming signal sequence is carried out with a scanning frequency in the nanosecond range. For example, signal processing takes place in a parallel adder and for each transmission pulse there is a continuous parallel addition of the digitized received signals to the addend signal of the adder. In particular, the output of adder can be connected across a shift register to the input for the second addend. Alternatively the processor can be constituted by a microprocessor operating in the nanosecond range and in which is contained the function of the transmission pulse-related parallel adder

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