The measuring error analysis of space Brillouin scattering based on edge detecting technology

摘要

Nowadays, the edge detecting technology based on Brillouin scattering signal has became the most advanced research of lidar. This technology is widely applied to the areas of detecting atmosphere wind, space environment, and space objects and so on. In this lidar system based on edge detecting technology, it is important to analyze measuring error. In order to research measuring error, the space atmosphere channels are analyzed and the measuring error formula of detecting Brillouin scattering frequency shift is educed. At the same time, Brillouin scattering echo signal received by the edge detecting technology is estimated. A program is designed to simulate measuring error of detecting Brillouin scattering frequency shift at different altitudes and with different Brillouin scattering frequency shift. From the simulation results, we can find that in the ideal atmosphere conditions, the measuring error of Brillouin scattering frequency shift is less than 20MHz at 100km height and less than 5MHz at 30km height in the atmosphere. Based on the results above, we can draw a final conclusion: the edge detecting technology holds high signal-to-noise ratio and small measuring error.