Shot noise statistics and information theory of sensitivity limits in frequency-modulated continuous-wave ladar
Shot noise statistics and information theory of sensitivity limits in frequency-modulated continuous-wave ladar
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DOI：
10.1364/josaa.30.001335
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发表时间：
2013-07-01
影响因子：
1.9
通讯作者：
Erkmen, Baris I.
中科院分区：
文献类型：
--
作者：
Barber, Zeb W.;Dahl, Jason R.;Erkmen, Baris I.
对调频连续波（FMCW）激光雷达在强本振条件下的灵敏度极限进行了理论分析和实验验证。相干外差探测的单光子灵敏度在这个散粒噪声占主导地位的限制被证实扩展到线性啁啾波形。利用信息论方法分析了单目标和多目标测距任务中接收光子的信息效率。研究发现，最佳接收信号电平与可分辨距离位置数的对数成正比，相干场FMCW测距的最大理论光子信息效率为log（e），约为1.44比特/接收光子。(C)2013年美国光学学会
A theoretical analysis and experimental verification of the sensitivity limits of frequency-modulated continuous-wave (FMCW) ladar in the limit of a strong local oscillator is presented. The single-photon sensitivity of coherent heterodyne detection in this shot-noise dominated limit is verified to extend to linearly chirped waveforms. An information theoretic analysis is presented to estimate the information efficiency of received photons for the task of locating the range to single and multiple targets. It is found that the optimum receive signal level is proportional to the logarithm of the number of resolvable range locations and the maximum theoretical photon information efficiency for FMCW ranging with coherent fields is log(e) approximate to 1.44 bits per received photon. (C) 2013 Optical Society of America