Pulse laser range finding system echo signal processing device and method

Abstract

The invention discloses a pulse laser range finding system echo signal processing device and method. The device comprises a main controller, a driving circuit, a laser, an optical system, a PIN photoelectric detector, a main wave amplifier, a fixed threshold time discrimination circuit, an APD photoelectric detector, a preamplifier, a main amplifier, an autocorrelation detection circuit, a dual-threshold time discrimination circuit, a high voltage bias circuit, a first peak sampling circuit, a first A / D conversion circuit, a second peak sampling circuit, a second A / D conversion circuit, a D / A conversion circuit, an LED display screen, and an upper computer. The first peak sampling circuit, the first A / D conversion circuit, the second peak sampling circuit, the second A / D conversion circuit, and the D / A conversion circuit are combined with the dual threshold time discrimination circuit to stabilize an echo signal amplitude. At the same time, the autocorrelation detection circuit is used to extract an echo signal from a noise, a system signal-to-noise ratio is increased, range finding accuracy is improved, and a system measurement range enlarged. And by using the method, a system integration degree can be increased.

Description

technical field [0001] The invention relates to the technical field of laser ranging, and more specifically relates to a high-precision and large-range pulsed laser ranging system echo signal processing device and method based on time-of-flight measurement. Background technique [0002] Laser is widely used in the field of ranging because of its good directionality, high brightness, and good coherence. Pulse laser ranging has high peak power, long detection distance, high measurement accuracy, low requirements for light source coherence, and no need for cooperative targets. Etc. The basic principle of pulsed laser ranging is that the laser emits laser pulses to the target, and the laser light reaches the target surface and is received by the echo receiving channel after diffuse reflection, and the flight time t of the laser pulse from emission to reception of the echo is measured to calculate the waiting time Distance measurement L=c*t / 2, where c is the speed of light, and ...

AI Technical Summary

Problems solved by technology

Although the circuit structure of the fixed threshold time identification method is simple and can filter out certain noises, it is greatly affected by echo drift errors and has poor accuracy.

Although the high-pass resistance-capacitance method and the constant-ratio timing method are less affected by the amplitude change of the echo signal, neither of them allows the signal to be saturated, which does not meet the requirements of a wide range of applications, and is susceptible to false triggering caused by noise.

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