<title>Method and analysis of calculating signal-to-noise ratio in lidar sensing</title>

As one of the most versatile tools lidar plays an important role in the field of the atmospheric and environmental probing for its special properties of fine resolution continual operation long-range and wide scanning. The most important parameter of lidar is the signal-to-noise ratio (SNR) and it not only shows the ability in remote sensing but also gives some instructions in designing of lidar. But there is still not a suitable and scientific way to calculate the lidar's signal-to-noise ratio in practice. Under this circumstance the new and reasonable method is present from the experience in lidar working and its data processing and the analyses of main influencing factors are also made on real lidar data.