Laser echo processing method and system with adaptive automatic gain control

Abstract

The invention provides a laser echo processing method and system. The method comprises the following steps of: reflecting a laser beam by an obstacle to form an echo optical signal; converting the echo optical signal into an echo pulse electric signal; amplifying the echo pulse electric signal and carrying out full-waveform sampling; and carrying out echo peak extraction on the sampling data afterthe full-waveform sampling, and comparing echo peak data and threshold data to generate two paths of control signals, wherein one path controls light emitting energy of the laser beam and the other path controls an amplification factor of the echo pulse electric signal. When the echo peak data is larger than a threshold data upper limit value, the light emitting energy of the laser beam or the amplification factor of the echo pulse electric signal is reduced; when the echo peak data is smaller than a threshold data lower limit value, the light emitting energy of the laser beam or the amplification factor of the echo pulse electric signal is increased. Therefore, the amplitude of the echo signals is more stable while the signal to noise ratio of the echo signals is maximized, the quality of the echo signals is improved, and the laser ranging performance is improved.

Description

technical field [0001] The invention relates to the technical field of geographic surveying and mapping, in particular to a laser echo processing method with adaptive automatic gain control. Background technique [0002] With the rapid development of high and new technologies such as electronic technology, laser technology, and optical technology, it provides an important foundation for the improvement of long-range range finders. In particular, emerging disciplines represented by laser applications are on the rise. The innovation of related concepts and rich practical experience have provided effective references for the research work of long-range laser ranging technology. [0003] The principle of laser ranging is to calculate the product of the laser flight time interval and the speed of light. The speed of light is a known condition, which is 300,000 km / s, and what needs to be measured is the laser flight time interval. The laser flight time interval refers to the tim...

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Problems solved by technology

[0004] The actual application environment of laser ranging is more complex, affected by various factors such as laser emission energy, measurement distance, surface object reflectivity and atmospheric transmittance, the echo amplitude varies widely, which may cause the amplifier circuit to oversaturation, It is impossible to realize multi-echo measurement, and even lead to no echo signal at all in the subsequent stage; the traditional automatic gain control method is used to fix the light output energy of the laser, and only adjust and control the amplification factor of the automatic gain amplifier according to the echo amplitude. It is very good to control the echo amplitude in an appropriate range, and the signal-to-noise ratio of the echo signal is not high

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