Online correction method for a conversion curve based on piecewise Spline fitting

A technology for fitting equations and linear systems, applied in the field of linear measurement systems, can solve problems such as increased calibration workload and complicated calibration process, and achieve the effects of less workload, high correction accuracy, and less resource consumption

Active Publication Date: 2020-02-04
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

Obviously, the fineness of the segment interval of the constructed lookup table directly determines the correction accuracy: the finer the segmentation, the higher the correction accuracy, but at the same time, the required calibration process is more complicated
For a multi-channel integrated system, due to inconsistencies between channels, each channel must be calibrated individually and a lookup table must be constructed, which will further increase the workload of calibration

Method used

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  • Online correction method for a conversion curve based on piecewise Spline fitting
  • Online correction method for a conversion curve based on piecewise Spline fitting
  • Online correction method for a conversion curve based on piecewise Spline fitting

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. Implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values ​​may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values ​​within acceptable error margins or design constraints. The directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only referring to the directions of the...

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Abstract

The invention provides an online correction method for a conversion curve based on segmented Spline fitting. The method is used for correcting a conversion curve of a measurement system and comprisesthe following steps: firstly, calibrating a to-be-corrected measurement system, namely calibrating the to-be-corrected measurement system, selecting a segmented fitting region interruption point according to a first-order linear fitting error of a calibration result, carrying out Spline fitting, converting parameters obtained by fitting into a binary format, and writing the parameters into an FPGAlookup table; and executing a correction parameter calling process: when the actual measurement system works, judging the interval where the measurement result of the system is located, calling the correction parameter of the corresponding segmented interval in the lookup table, and obtaining the corrected measurement result through hardware calculation.

Description

technical field [0001] The disclosure relates to the field of linear measurement systems, such as high-precision charge measurement, and relates to an online correction method for a measurement system based on segmental Spline fitting, especially the generation of correction parameters based on the Spline fitting results of the system conversion curve, and online correction through FPGA Methods. Background technique [0002] The input and output of a linear measurement system have an ideal linear relationship in theory. But there must be nonlinearity in the actual measurement system. Correcting the nonlinearity of the measurement system is an important process in the measurement. [0003] Taking high-precision charge measurement as an example, a common method of charge measurement is that the input signal of the electronic system is digitally peaked or summed by the ADC after analog shaping, and the ADC code value is used as the output result of the measurement. Due to th...

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Application Information

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IPC IPC(8): G06F30/20G01R35/00G01R29/24
CPCG01R35/005G01R29/24
Inventor 赵雷顾金亮曹喆刘树彬安琪董若石
Owner UNIV OF SCI & TECH OF CHINA
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