消除距离模糊的扩展伪随机码调制激光测距技术

发布时间：2018-02-04 09:44

本文关键词： 测量激光测距调制测距距离模糊单光子伪随机码　出处：《中国激光》2016年04期 　论文类型：期刊论文

【摘要】：单光子测距中采用高重复频率激光源可提高回波信噪比,同时会带来距离模糊问题。为消除距离模糊,基于调制测距和时间相关光子计数理论设计了一种测距技术,分步计算得到脉冲飞行时间所包含的不模糊时间和激光发射周期的倍数,进而得到距离。该技术具有运算量小和测距效率高等优点。基于m序列得到"1"所占比例可变的扩展伪随机序列,用来模拟噪声,并作为激光发射调制信号。测距仿真中比较了3种扩展伪随机序列的调制测距能力,结果表明:"1"所占比例为7/8的扩展伪随机序列兼顾了随机性和抗噪声能力,得到了优于全"1"序列和m序列的调制测距效果。
[Abstract]:The high repetition rate laser source in single photon ranging can improve the signal to noise ratio (SNR) of echo, at the same time, it will bring about the problem of range ambiguity. Based on the theory of modulation ranging and time-dependent photon counting, a ranging technique is designed to calculate the multiple of the time of pulse flight and the period of laser emission step by step. This technique has the advantages of low computation and high ranging efficiency. Based on m sequence, the extended pseudorandom sequence with variable proportion of "1" is obtained, which is used to simulate noise. The modulation and ranging capability of three kinds of extended pseudorandom sequences are compared in the simulation of ranging as a modulated signal transmitted by laser. The results show that the extended pseudorandom sequence with "1" ratio of 7/8 takes into account both randomness and anti-noise ability, and the effect of modulation ranging is better than that of "1" sequence and m sequence.
【作者单位】：光电控制技术重点实验室;中国航空工业集团公司洛阳电光设备研究所;
【基金】：航空科学基金(2014ZC13004)
【分类号】：TN249
【正文快照】： 1引言单光子测距采用了新的测距体制,在设备体积和质量等受限的机载环境下可实现远距离测距,具有很好的研究价值和应用前景。随着激光器技术的发展,千赫兹激光器被逐渐应用到测距中[1-5]。提高发射重复频率可在一定时间内积累更多的回波光子,从而提高信噪比,增强距离检测能力;

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