Signal de-smoothing method and system

Abstract

The present application discloses a signal de-smoothing method and system. The signal de-smoothing method adopts a more reasonable assumption, i.e., assuming that the metastable helium atom density ina sub-detection region of each layer is a constant. The metastable helium atom density data processing method based on this assumption is beneficial to reducing the signal smoothness during the detection process, and achieves the purpose of reducing the smoothness of signals received by a receiving system to a true value on height, thereby achieving the purpose of improving the physical resolution of each pixel element in the receiving system of a receiving and transmitting split metastable helium laser radar. In addition, by using the signal de-smoothing method for data processing, the distance resolution can be improved to a certain extent, the smoothing effect can be removed, and fluctuations or mutations within a small scale range can be discovered more easily.

Description

Technical field [0001] This application relates to the technical field of atmospheric laser remote sensing, and more specifically, to a signal smoothing method and system. Background technique [0002] Metastable helium atom He(2 3 S) It is abundant in the thermosphere and the exosphere. It can be used as an effective scatterer. A resonant helium lidar whose frequency is tuned to the resonance frequency of the atom can be used to detect metastable helium to obtain a height range of 200-1000km. For important atmospheric parameters such as metastable helium density, the lidar used to detect metastable helium can usually be called metastable helium lidar. [0003] The measurement of metastable helium can give us a better understanding of the thermosphere and solve some scientific problems related to the thermosphere. For example, the density of metastable helium at dawn and dusk is mainly affected by photoelectrons. The measurement of metastable helium density is conducive to better ...

AI Technical Summary

Problems solved by technology

Such smoothing will cover up the fluctuations or sudden changes in the small-scale range of the metastable helium density, especially the density change whose scale is smaller than the difference between the highest and lowest heights corresponding to the pixel, thus causing the physical resolution of each pixel to be limited to the pixel The difference between the corresponding minimum detection height and the maximum detection height makes it difficult for the physical resolution of the existing transceiving-separated metastable helium lidar to meet the actual detection requirements

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