Filtering method based on frequency distribution principle

Abstract

The invention relates to a filtering method based on a frequency distribution principle. The filtering method comprises the following steps: acquiring N groups of Raman spectrums, and calculating peak intensity storage arrays Ix of the Raman spectrums; dividing Ix into M sections; grouping the arrays Ix according to the sections, and counting the frequency of the sections; calculating a section K with the maximum frequency, and calculating a medium value Ixm (K) of the section; setting the maximum Raman spectrum intensity fluctuation deviation A, if the Raman spectrum intensity of the (N+1)th group is within a section [Ixm(K)-A, Ixm(K)+A,], judging that the Raman spectrums are effective, preprocessing, and storing in a register, or else judging that the Raman spectrums are ineffective, and abandoning, wherein the lengths of a plurality groups of Ix are fixed, the peak intensity of each group of newly acquired Raman spectrums is put into an array tail, one piece of data at the head of an original array is abandoned, N data is kept the latest, and overlapping is performed after L groups of effective Raman spectrums inside the register are achieved. The filtering method is remarkable in filtration effect and good in instantaneity, instantaneous noise interference can be effectively eliminated, and the interference resistance and the water temperature measurement precision of a Raman scattering ocean temperature laser remote sensing system can be improved.

Description

technical field [0001] The invention belongs to the field of marine monitoring, in particular to a filtering method based on the frequency distribution principle suitable for a Raman scattering seawater temperature laser remote sensing measurement system. Background technique [0002] Seawater underwater temperature measurement is very important for the study of marine environment and climate monitoring and early forecast of natural disasters. Due to the good transmittance of the blue-green laser in water, it can be used for remote sensing measurement of seawater underwater temperature to quickly obtain its horizontal and vertical distribution. It has incomparable methods such as fixed-point station measurement such as buoys and surface temperature measurement methods such as microwave radiation or infrared radiation. advantage. At present, many researchers at home and abroad have conducted extensive and in-depth research on Raman scattering seawater temperature laser remot...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problem that the Raman scattering spectrum of water is greatly fluctuated by noise interference signal intensity, and to provide a method that is simple, reasonable, easy to implement, has obvious filtering effect, can effectively eliminate external noise signal interference, and improve the Raman A filter method based on the principle of frequency distribution for the real-time temperature measurement accuracy of Mann scattering seawater temperature laser remote sensing measurement system

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