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提出一种基于硬件的等光频间隔采样消除调频连续波(FMCW)激光测距系统调频非线性的改进措施。改进后的等光频间隔采样通过硬件数据采集即可一步实现,无需再进行后续繁杂的软件处理过程,极大地节省了内存空间和数据处理时间,并且较之基于软件的等光频间隔重采样方法采样位置更准确。研究了调频非线性对调频连续波激光测距系统测距精度的影响以及等光频间隔采样消除调频非线性的原理。在此基础上,针对等光频间隔采样方法在时域上为非均匀采样,传统频谱分析方法不再适用的问题,对其进行新的频谱分析,并推导出了重采样之后频谱峰值频率计算公式以及测距系统的距离求取公式,通过仿真验证了新的频谱分析公式的正确性。实验结果表明,基于硬件的等光频间隔采样方法比基于软件的等光频间隔重采样方法更简单并且具有更好的非线性消除效果、更高的测距分辨力和稳定性。
This paper presents a hardware-based improvement measure to eliminate the non-linearity of the FMCW laser range finder system. The improved equal-frequency interval sampling can be realized in one step by hardware data acquisition, eliminating the need for subsequent complicated software processing, greatly saving memory space and data processing time, and compared with the software-based equal-frequency interval resampling Method Sampling location more accurate. The effect of FM nonlinearity on the range accuracy of FM CW laser range finder system and the principle of eliminating the non-linearity of FM at the same interval of light frequency are studied. On the basis of this, aiming at the problem that the equal-frequency interval sampling method is non-uniform in the time domain and the traditional spectrum analysis method is no longer applicable, a new spectrum analysis is carried out and the spectrum peak frequency calculation after resampling is deduced Formula and distance measurement system to obtain the formula, the simulation verified the correctness of the new spectrum analysis formula. The experimental results show that the hardware-based equal-frequency interval sampling method is simpler and has better nonlinear elimination effect, higher ranging resolution and stability than the software-based equal-frequency interval resampling method.