论文部分内容阅读
在激光测距中,测程和测量精度一直都是一对矛盾体。在保证测程的同时,提高测量精度是本次设计的关键所在。相位式激光测距的传统思想是将高频信号进行混频之后得到频率较低的差频信号,使用FFT得到相位,但是信号经混频后会带来幅度的衰减和相位的偏移。为了解决该问题,提出一个新的思路,利用欠采样技术与同步检测原理改进测相方法,降低数据处理的复杂度,提高相位检测的精度。用MATLAB仿真有白噪声和其他干扰信号存在时欠采样技术测量相位的精度,经过误差分析之后进行改进并与传统的方法进行了比较。
In laser ranging, range and measurement accuracy has always been a pair of contradictions. In ensuring the measurement process at the same time, improve the measurement accuracy is the key to this design. The traditional idea of phase laser ranging is to obtain a low-frequency beat signal after mixing the high-frequency signal, and to obtain the phase by using FFT. However, the signal will have amplitude attenuation and phase offset after being mixed. In order to solve this problem, a new idea is put forward. By using the principle of under-sampling and synchronous detection, the method of photometry is improved, the complexity of data processing is reduced, and the accuracy of phase detection is improved. Using MATLAB to simulate the accuracy of under-sampling technique in the presence of white noise and other interfering signals, the accuracy of phase measurements was improved and compared with the traditional method after error analysis.