Method for suppressing interference of echo-impact response of frequency modulated continuous wave(FMCW) radar fluid-level meter

A technology of radar liquid level gauge and shock response, which is applied in liquid level indicator, engine lubrication, radio wave measurement system, etc. It can solve problems such as misjudgment, falling target detection, and affecting the measurement accuracy of radar liquid level gauge. The effect of high measurement accuracy, few conditional constraints, and good test results

Inactive Publication Date: 2017-06-13
LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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Problems solved by technology

[0003] However, during the research and development of radar level gauges, due to the transient impulse response of the receiving channel of the radar receiver, the impulse response interference is caused to the radar echo. This interference is mainly impact noise, which is much stronger than that

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  • Method for suppressing interference of echo-impact response of frequency modulated continuous wave(FMCW) radar fluid-level meter
  • Method for suppressing interference of echo-impact response of frequency modulated continuous wave(FMCW) radar fluid-level meter
  • Method for suppressing interference of echo-impact response of frequency modulated continuous wave(FMCW) radar fluid-level meter

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[0042] figure 1 What the present invention gives is a schematic diagram of the working scene of the radar level gauge, figure 2 It is the flow chart of the algorithm for suppressing the interference of the FMCW radar level gauge impulse response provided by the present invention. Combine figure 2 , The AR model predictive interpolation algorithm to suppress the impact response interference of the FMCW radar level gauge includes the detection of the impact response interference area, the removal of the echo points with the impact response interference from the original signal, and the prediction and interpolation based on the AR model. Partial composition.

[0043] Such as image 3 As shown, the impulse response interference is very obvious in the front of the radar level gauge echo. Figure 4 It is the radar level gauge echo that contains impulse response interference ( image 3 ), it can be seen that the presence of interference makes the SNR of the target drop sharply and the...

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Abstract

The invention provides a method for suppressing interference of echo-impact response of a frequency modulated continuous wave(FMCW) radar fluid-level meter. The method is characterized by including the following steps of detecting impact response interference zone, analyzing measured detecting sampling points in a way of x<0>,x<1>,...x<N-1>; detecting detecting sampling points which are satisfied with the formula (1)(the formula is as shown in the description) in time-domain, wherein the x,(i=0, 1, 2...N-1) represents the ith sampling point; taking fifteen points of the left side and the right side of an amplitude maximum point in the detecting sampling points respectively as the impact response interference zone, and if points on the left side of the detecting sampling points are less than fifteen points, taking all sampling points from the first point on the left side to the amplitude maximum point; drugging out detecting sampling points in the impact response interference zone in the original signal of time-domain and compensating zero; predicting and interpolating based on auto regressive(AR) model.

Description

technical field [0001] Radar level gauge ranging technology Background technique [0002] In foreign countries, FMCW radar level gauge is widely used in petrochemical and storage industries, and is the core sensor of oil storage tanks. FMCW uses continuous signal transmission and processing instead of pulse radar signal transmission-wait-receive intermittent work method, it is more suitable for process tanks, mixing tanks and other occasions where the liquid level is severe, and it is used in high-end applications (Rosemount Radar Level Co., Ltd. Radar Level Measurement. Invention Patent, Patent Application No.: CN200710153641.0) . [0003] However, during the development of the radar level gauge, due to the transient impulse response of the receiving channel of the radar receiver, the impulse response interference is caused to the radar echo. This interference is mainly impact noise, which is much stronger than that of the oil tank. Liquid level echo, this kind of interfe...

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Application Information

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IPC IPC(8): G01S7/36G01F23/284
CPCG01S7/36G01F23/284
Inventor 王福友谢金华聂翀
Owner LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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