激光测距中APD阵列探测信噪比分析

发布时间：2018-11-11 08:37

【摘要】：APD阵列可提高光子探测效率,然而在回波探测概率提高的同时提高噪声探测概率,因此需合理选择阵列单元数以提高探测信噪比。根据回波和噪声在距离门内的分布情况,结合光子探测概率,建立了盖革模式下APD阵列探测信噪比随阵列单元数的变化模型。讨论了回波光子数、背景噪声强度、回波在门控内位置、占空比等因素对探测信噪比的影响。分析结果表明,提高回波光子数、探测器占空比、轨道预报精度有助于增加APD阵列的探测信噪比;4元APD阵列适用于回波光子数小于0.1、门控内噪声光子数小于1的观测情况,而回波和噪声强度较强时,25元APD阵列能够取得相对较优的探测信噪比。建立的APD阵列探测信噪比模型有助于快速选择APD阵列单元数以达到较高探测信噪比。
[Abstract]:APD array can improve the efficiency of photon detection, however, the detection probability of echo can be increased while the detection probability of noise is increased. Therefore, it is necessary to select the number of array units reasonably to improve the detection SNR. According to the distribution of echo and noise in the range gate and the probability of photon detection, a model of signal to noise ratio (SNR) of APD array detection with the number of array cells is established in the Geiger mode. The effects of echo photon number, background noise intensity, echo position in the gate and duty cycle on the signal-to-noise ratio (SNR) are discussed. The results show that increasing the number of echo photons, the duty cycle ratio of the detector, and the precision of orbit prediction are helpful to increase the signal-to-noise ratio of APD array detection. The 4-element APD array is suitable for the observation of the number of echo photons less than 0.1 and the number of internal noise photons less than 1. When the echo and noise intensity are strong, the 25-element APD array can obtain a relatively good detection signal to noise ratio (SNR). The SNR model of APD array detection is helpful to select the number of APD array units quickly to achieve a higher detection SNR.
【作者单位】：北京跟踪与通信技术研究所空间目标测量重点实验室;中国科学院云南天文台;
【基金】：国家自然科学基金(U1431116) 国家863高技术研究发展计划(2011AAXXX0110)
【分类号】：P228.5

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