Time-gated processing of pulse laser ranging echo signal
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摘要: 为了降低高重频脉冲激光测距回波信号的误识别率，提高测距性能，对高重频脉冲激光测距回波信号调理技术进行深入研究。采用FPGA作为主控芯片，产生激光调制脉冲，并根据被测距离3.33 μs～33.33 μs时间选通方波信号，驱动开关芯片产生与量程关联的时间波门，有效滤除脉冲回波中的干扰脉冲，该方法改进了常规脉冲激光测距信号处理系统的自动增益控制环节。测试实验结果表明：在脉冲回波信号60 dB的动态范围内，可有效滤除回波信号中引入的干扰脉冲，极大地降低了干扰脉冲误识别造成粗大误差的可能性。该方法可推广应用于脉冲激光测距信号处理系统，使系统测距精度提高12.6%。Abstract: In order to reduce the error recognition rate of high repetition pulse laser ranging echo signal and improve the ranging performance, the adjustment technology of high repetition pulse laser ranging echo signal is studied deeply. FPGA was used as the main control chip to generate laser modulation pulses, and square wave signals were selected according to the measured distance of 3.33 μs～33.33 μs, and the switch chip was driven to generate the time wave gate associated with the range, effectively filtering out the interference pulses in the pulse echo. This method improved the automatic gain control link of the conventional pulse laser ranging signal processing system. The test results show that within the dynamic range of 60 dB of the pulse echo signal, interference pulses introduced in the echo signal can be effectively filtered out, greatly reducing the possibility of error caused by the false recognition of interference pulses. This method can be applied to the pulse laser ranging signal processing system, and the ranging accuracy of the system can be increased by 12.6%.
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Keywords:
- laser ranging /
- time gate /
- interference pulse /
- high frequency
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图 1 常规高重频脉冲激光测距系统
Figure 1. Conventional high repetition rate pulse laser ranging system
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图 5 不同起始相位、相同幅值下的峰值保持值
Figure 5. Peak holding value under different starting phases and same amplitude
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图 7 时间波门内不同位置、相同幅值的峰值AD采集值
Figure 7. Peak AD values of different positions and same amplitude in time gate
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