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在三维激光扫描探测系统中,激光测距的测量重频和测量精度是影响整个系统性能的关键参数。介绍了三维激光扫描探测系统的工作特点,设计了一种以NiosII嵌入式软处理器为核心的高重频、高精度脉冲激光测距系统。通过分析影响测量重频和测距精度的因素,采用双阈值时刻鉴别方法进行计时起止时刻的鉴别,使用TDC-GP2高精度时间间隔测量芯片进行精密计时,设计了基于NiosII嵌入式软处理器的计时控制系统以提高测量重频。实验结果表明:实现了测量重频为20 000次/s、测距精度为3 cm的激光测距。与传统的单片机控制的计时系统相比,该系统不仅测量重频和测量精度高,且具有更好的可扩展性和灵活性。
In the three-dimensional laser scanning detection system, the measurement of laser ranging re-frequency and measurement accuracy are the key parameters affecting the overall system performance. The working characteristics of the 3D laser scanning detection system are introduced, and a high repetition rate and high precision pulse laser ranging system based on NiosII embedded soft processor is designed. By analyzing the factors affecting the measurement repetition rate and ranging precision, the dual-threshold time-of-day identification method is used to discriminate the start and end timing of timing, the TDC-GP2 high precision time interval measurement chip is used for precision timing, and a NiosII embedded soft processor Timing control system to improve measurement repetition rate. The experimental results show that the laser range finder with the repetition rate of 20 000 times / s and the ranging accuracy of 3 cm is achieved. Compared with the traditional timing system controlled by a single chip, the system not only measures the repetition frequency and the measurement accuracy is high, but also has better scalability and flexibility.