Laser pulse distance measuring method for correcting measurement error by utilizing received signal width

Abstract

The invention discloses a laser pulse distance measuring method for correcting a measurement error by utilizing received signal width. The method comprises the following steps that a pulse laser is adopted for a light source, a driving circuit drives the laser to emit narrow-pulse-width laser pulses, and the laser pulses are emitted at a certain beam-divergence angle after being shaped by a transmitting optical system. Target echo signals are converged on the photosensitive surface of a photoelectric detector through a receiving optical system to achieve photoelectric conversion. Electric signals are converted into digital signals after being preprocessed. An FPGA phase-shifting clock is used for carrying out high-speed sampling on echoes, and the time delay and the receiving signal widthof the reflected echoes are measured. A data table is made according to the relation curve of actually measured received signal width and the delay compensation amount. A distance measuring machine isused for obtaining time identification errors so as to correct a distance measuring result through a table look-up mode according to the leading edge time and the received signal width measured by the FPGA. According to the invention, higher distance measuring precision can be realized, and the method has a good application prospect in the relevant field of laser distance measuring.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a laser pulse ranging method for correcting measurement errors by using the received signal width. Background technique [0002] At present, laser ranging methods are mainly phase method and pulse method. Although the phase method has high precision in ranging, it cannot realize long-distance measurement. The pulse method has the advantages of long detection distance and low coherence requirements for light sources. It uses the characteristics of extremely short laser pulse duration, relatively concentrated energy in time, and large instantaneous power. Under the same average optical power , enabling long-distance measurements with limited precision. Therefore, it is widely used in the fields of construction engineering, industry, aerospace, military, atmospheric detection and robotics. Different application fields have different requirements for measurement range and accu...

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Problems solved by technology

Although the phase method has high accuracy, it cannot achieve long-distance measurement

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