Radar level instrument signal processing method based on curve fitting

Abstract

The invention relates to a radar level instrument signal processing method based on curve fitting. The method includes the steps of calculating the slope of each point of an echo rising edge, judging whether the duration time of the rising edge meets the minimum keeping time or not, determining a certain rising edge as a target estimation position through the maximum slope, fitting a parabola through the least square method according to data of a 60% to 90% section of a crest of the rising edge at the target estimation position, calculating the peak value and corresponding time, and finally accurately positioning a level instrument. By means of the method, the purpose of positioning the multi-diameter multi-echo crest is effectively achieved, the influences of the measurement environment and a target object itself on an echo rear edge are eliminated, and the positioning accuracy is improved.

Description

technical field [0001] The invention relates to the field of industrial measurement, in particular to a method for processing signals of radar level gauges based on curve fitting. Background technique [0002] Level is an important parameter in industrial production. Existing static pressure method, float type, ultrasonic and other level measuring instruments have their own characteristics and application ranges. Radar level gauges have unique advantages through advanced processing technology, especially under harsh measurement conditions such as high temperature, high pressure, steam, and strong medium corrosion, which show their excellent performance and play an increasingly important role in industrial production. effect. [0003] Industrial level and liquid level gauges have complex working conditions, such as interference, probe coating, foam, steam and turbulent flow measurement conditions that lead to measurement accuracy problems. A typical algorithm is to detect ...

AI Technical Summary

Problems solved by technology

In practical applications, waveform multipath effects often have multiple echoes, for example, wall echoes lead to more than one peak value, and it is difficult to determine the peak value

[0004] The existing precise positioning technology is realized by linear interpolation of the echo. The peak value and the back edge of the echo are easily affected by the measurement environment and the target object itself. Linear interpolation is difficult to combine the actual waveform characteristics, which makes it difficult to determine the correct echo arrival time. Limited ability to improve accuracy

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