Luo Hanjun, Yuan XiuHua, Zeng Yanan
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.
Opt Express. 2013 Aug 12;21(16):18983-93. doi: 10.1364/OE.21.018983.
In this paper, we propose a combined system of heterodyne detection with laser pulse and photon counting based on Geiger-mode avalanche photodiode (GM-APD) that is designed to achieve the range of remote non-cooperative target. Based on the heterodyne principle and assuming that the creation of primary electrons in GM-APD is Poisson-distributed, the range accuracy model is established. The factors that influence the range accuracy, namely pulse width, echo intensity, local oscillator (LO) intensity, noise, echo position, and beat frequency, are discussed. The results show that these six factors have significant influence on the range accuracy when the echo intensity is extremely weak. In case that the primary electrons of the echo signal are beyond 4, the pulse width and echo intensity are the main influence factors. It is also shown that the stronger echo intensity, narrower pulse width, low noise, large echo position, and small beat frequency produce higher range accuracy in a pulsed photon heterodyne detection system based on GM-APD.
在本文中，我们提出了一种基于盖革模式雪崩光电二极管（GM-APD）的激光脉冲外差探测与光子计数相结合的系统，该系统旨在实现对远程非合作目标的测距。基于外差原理，并假设GM-APD中一次电子的产生服从泊松分布，建立了测距精度模型。讨论了影响测距精度的因素，即脉冲宽度、回波强度、本地振荡器（LO）强度、噪声、回波位置和拍频。结果表明，当回波强度极弱时，这六个因素对测距精度有显著影响。当回波信号的一次电子数超过4时，脉冲宽度和回波强度是主要影响因素。研究还表明，在基于GM-APD的脉冲光子外差探测系统中，较强的回波强度、较窄的脉冲宽度、低噪声、较大的回波位置和较小的拍频会产生更高的测距精度。
