脉冲激光四象限探测器测角不确定性统计分布

发布时间：2018-03-12 18:26

  本文选题：四象限探测器　切入点：测角　出处：《物理学报》2017年01期 　论文类型：期刊论文

【摘要】：针对噪声信号对脉冲激光四象限探测器(QPD)数字式测角算法产生的影响,分析了激光四象限探测器测角不确定性统计分布规律.建立了激光测角电路通道模型和QPD光敏面光斑模型,并根据随机噪声类型和理想信号类型,建立了单通道可测信号模型.考虑到QPD的对称性,对不同的理想信号时域分布类型、光斑总峰值功率、理想信号半峰宽度和等效噪声电压概率密度标准差等四种变量,在θ∈[0,π/4]的范围内通过蒙特卡罗仿真实验方法计算了五个不同光斑中心的QPD测角αy值的统计分布规律.仿真结果表明:测角αy值的统计分布呈正态分布,并被四种变量影响;特别是被单象限信噪比显著影响.光斑中心越靠近坐标轴中心,QPD测角精度越高;光斑中心不在坐标轴中心附近时QPD的测角αy的统计分布均值都小于理想测角值.
[Abstract]:In view of the influence of noise signal on the digital angle-measuring algorithm of pulsed laser four-quadrant detector, The statistical distribution law of uncertainty in angle measurement of laser four-quadrant detector is analyzed. The circuit channel model of laser angle measurement and the QPD Guang Min surface spot model are established, and according to the type of random noise and the type of ideal signal, A single channel measurable signal model is established. Considering the symmetry of QPD, four variables, such as time domain distribution type of ideal signal, total peak power of spot, half-peak width of ideal signal and probability density standard deviation of equivalent noise voltage, are considered. In the range of 胃 鈭，

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