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Method to improve the signal-to-noise ratio of photon-counting chirped amplitude modulation ladar

机译：提高光子计数-调幅雷达信噪比的方法

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Photon-counting chirped amplitude modulation (PCCAM) ladar employs Geiger mode avalanche photodiode as a detector. After the detector corresponding to the echo signal is reflected from an object or target, the modulation depth (MD) of the detection outputs has some certain loss relative to that of the transmitting signal. The signal-to-noise ratio (SNR) of PCCAM ladar is mainly determined by the MD of detection outputs of the echo signal. There is a proper echo signal intensity that can decrease the MD loss and improve the SNR of the ladar receiver. In this paper, an improved PCCAM ladar system is presented, which employs an echo signal intensity optimization strategy with an iris diaphragm under different signal and noise intensities. The improved system is demonstrated with the background noise of a sunny day and the echo signal intensity from 0.1 to 10 countss. The experimental results show that it can effectively improve the SNR of the ladar receiver compared with the typical PCCAM ladar system.
机译：光子计数chi振幅调制（PCCAM）激光雷达采用Geiger模式雪崩光电二极管作为检测器。在从物体或目标反射与回波信号对应的检测器之后，检测输出的调制深度（MD）相对于发射信号具有一定的损耗。 PCCAM激光雷达的信噪比（SNR）主要由回波信号检测输出的MD决定。存在适当的回波信号强度，可以降低MD损耗并改善激光接收器的SNR。本文提出了一种改进的PCCAM激光雷达系统，该系统采用了在不同信号和噪声强度下具有虹膜光圈的回波信号强度优化策略。改进的系统通过晴天的背景噪声和0.1至10个计数/ ns的回波信号强度进行演示。实验结果表明，与典型的PCCAM雷达系统相比，它可以有效提高雷达接收机的信噪比。

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