One hundred kilometers high precision laser ranging hopes the detector has very strong detection ability for very weak light. At present, Geiger-Mode of Avalanche Photodiode has more use. It has high sensitivity and high photoelectric conversion efficiency. Selecting and designing the detector parameters according to the system index is of great importance to the improvement of photon detection efficiency. Design optimization requires a good model. In this paper, we research the existing Poisson distribution model, and consider the important detector parameters of dark count rate, dead time, quantum efficiency and so on. We improve the optimization of detection model, select the appropriate parameters to achieve optimal photon detection efficiency. The simulation is carried out by using Matlab and compared with the actual test results. The rationality of the model is verified. It has certain reference value in engineering applications.
Single photon ranging has high sensitivity and can effectively improve the measurement range. In order to improve the target detection efficiency of commonly, we use the method of multiple accumulation to improve SNR. For moving target echo signal, each has a certain offset. The echo signal accumulation broadening greatly increases the difficulty of signal extraction. The traditional method is using multiple filters. But for single photon signals, the filtering method is not effective. This paper studies the single photon echo ranging model. The mathematical model of the echo signal of moving target is established. Accumulation of moving target with velocity estimation overcomes the accumulation of the problem. Compared with the traditional filtering method, it has more superior performance. And the detection probability of the method is calculated by Matlab simulation, verifying its good performance.
The transmit power and laser divergence angle of single photon laser ranging system for
airborne is a key factor restricting the measurement range. A method is proposed in this paper to reduce the
laser divergence angle to increase the measurement process. And an auto tracking system based on fast
steering mirror is proposed to improve the accuracy of the pointing error because of the small divergence
angle in airborne environment. On the theory, it can increase the measurement range of not increasing the