Airborne laser bathymetric system has great advantages in shallow sea bathymetric mapping due to its no blind area, high accuracy and high density data. By using Monte Carlo method and radiation-transport equation, the spatial distribution of the signal spot on the sea surface is calculated respectively. The results show that the spatial distribution of the signal spot returned to the sea surface is more extensive with the increase of the depth, and the power attenuation of the center of the spot is more serious. In this paper, signal to noise ratio (SNR) is used as the performance evaluation criterion of laser bathymetry system, and the requirements of field of view for signal detection under different depth are analyzed. The analytic results will provide support for the design and optimization of the laser bathymetric system.
In order to detect dangerous space non-cooperative targets, we have researched the technology of single photon laser detection. A single photon detection model which includes relative radial velocity between space-based detector and target was proposed, as well as, we analyzed the detection method of non-cooperative targets on a space-based plat-form. The results of simulations show that single photon laser detection can effectively detect the target of the distance 160 km and velocity 5 km/s under the load requirements of the space-based platform, its ranging accuracy could be improved 2~3 orders of magnitude compared with world ground-based traditional detection technology for space non-cooperative targets , and it can effectively reduce the collision probability of spacecraft
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