光学线性调频步进信号合成与高分辨测距演示

利用分立激光器合成大带宽线性调频步进信号(FSCS)激光信号源以实现高分辨测距。依据FSCS信号测距原理,数值计算了激光器各参数对合成FSCS信号的影响及其误差容限。计算表明,在各激光器参数误差中,起始频率和起始时间误差是引起合成FSCS信号测距分辨力恶化的最主要因素。另外,利用一台中心波长1550nm、线宽为150kHz的线性调波长激光器,通过光学斩波方式,模拟产生了合成FSCS信号,进行了高分辨力的测距演示。理论分析与实验结果表明,采用分立激光器合成高分辨力测距FSCS信号是可行的。

Synthetic optical frequency-stepped chirp signal and its high resolution ranging demonstration

Synthesizing wideband optical frequency-stepped chirp signal (FSCS) with independent lasers for high resolution ranging is suggested. Based on the theory of FSCS signal ranging, both the influence of laser parameters on synthesizing FSCS signal and their error tolerances are investigated. Numerical results show that among the three laser parameters, jitters in starting frequency and starting time are the main factors causing range resolution deterioration. Meanwhile, a high resolution ranging experiment with optical FSCS signal is demonstrated, where the FSCS signal is simulated by optical chopping a linear wavelength sweeping laser at the center wavelength of 1550 nm and line width of 150 kHz. Both the theoretical analysis and the experimental results show that it is workable to form synthetic FSCS signal with several linear-chirped lasers for high resolution ranging.