利用线性调频半导体激光器的光反馈效应，可实现绝对距离的测量，但由于半导体激光器光频受环境温度影响较大，限制了该方法的测量精度和稳定性，为解决这一问题，本文提出了一种基于双光反馈的绝对测距方法，并给出了理论模型；理论分析表明，通过联合运用傅立叶变换技术和参考技术，可以降低由温度变化形成的误差，提高系统的测距精度及稳定性。 The use of linear FM semiconductor laser light feedback effect, can achieve the absolute distance measurement, but the semiconductor laser light frequency is greatly affected by the ambient temperature, which limits the accuracy and stability of the measurement method, in order to solve this problem, this paper proposes A method of absolute distance measurement based on double optical feedback is given and a theoretical model is given. The theoretical analysis shows that the error caused by temperature variation can be reduced and the ranging accuracy and stability of the system can be improved by using the Fourier transform technique and the reference technique together Sex.