A laser ranging system and method based on waveform time domain matching

Abstract

The invention discloses a pulse laser ranging system and method based on waveform time domain matching, and the system includes software and hardware. The FPGA sends a control signal to the laser narrow pulse transmitting circuit, and the transmitting circuit controls the laser transmitter to emit pulsed laser. The laser reflected by the object transmits the echo optical signal to the photoelectric conversion system through the optical collimation system and narrow-band filter. Signal combining system. When the FPGA transmits the control signal to control the laser emission, the FPGA simultaneously sends the time reference pulse to the signal combination system, and the combination system integrates the time reference pulse and the fixed-amplitude echo analog signal into an echo signal with time reference. The echo signal with time reference is quantized into a digital detection signal in the ADC sampling system, and sent to the FPGA for data analysis. After the waveform time domain matching analysis of the software part, the ranging result is output by the FPGA.

Description

technical field [0001] The invention relates to the technical field of measuring instruments, in particular to a pulse laser ranging system and method. Background technique [0002] The basic principle of pulse laser ranging is to actively emit pulse laser to the target, then detect the laser echo of the irradiated point on the target, measure the flight time of pulse laser, and obtain the distance from the target to the range finder. The ranging accuracy of pulsed laser ranging is determined by the measurement accuracy of laser time of flight. Because the pulsed laser is affected by the atmosphere and the scattering characteristics of the target, the laser echo has great differences in amplitude and shape, and the resulting time drift error makes it difficult to accurately determine the laser echo time. At present, there are four main methods for laser echo time identification: frontier identification method, constant ratio identification method, high-pass capacitive resis...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a laser ranging system and method based on waveform time-domain matching, which effectively overcomes the large fluctuations in trigger time caused by the trigger threshold of the TDC (time-to-digital converter) system with different echo amplitudes. It also solves the test rate problem of the low-IF phase-based ranging method

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