Method for improving AD acquisition accuracy based on least square method

Abstract

The invention belongs to the technical field of AD acquisition and discloses a method for improving AD acquisition accuracy based on the least square method. The method comprises the steps of S1, conducting data communication according to a communication protocol, sending an acquisition command, and receiving acquisition data; S2, conducting linear fitting on the AD acquisition data with the least square method to obtain zero offset and corrected slope values, and saving the zero offset and corrected slope values of all AD channels; S3, calibrating the zero offset and coefficients of the multiple AD channels according to a standard sampling voltage value required by calibration and the zero offset and corrected slope values of the AD channels. According to the method for improving AD acquisition accuracy based on the least square method, correction and compensation are conducted on the AD acquisition data with the least square method, the linear slope and zero offset of AD acquisition are calculated, and AD acquisition accuracy can be improved; meanwhile, filtering is conducted on the acquired voltage value with the filtering method, blurs can be well eliminated, interference can be avoided, and calibration accuracy can be improved; furthermore, voltage correction can be conducted on a multi-channel AD chip.

Description

technical field [0001] The invention belongs to the technical field of AD acquisition, and more specifically relates to a method for improving the accuracy of AD acquisition based on the least square method. Background technique [0002] Due to interference and the influence of the characteristics of the AD chip itself, in actual engineering applications, the voltage collected by the AD chip often has a certain deviation from the actual voltage. Therefore, the voltage value collected by the AD needs to be processed by an algorithm. In engineering practice, it is often necessary to perform voltage correction for 6 or even 12 AD channels at the same time, and each AD channel requires at least 20 sampled voltage values ​​for calibration. Correction is extremely difficult. Contents of the invention [0003] In view of the above defects or improvement needs of the prior art, the present invention provides a method based on the least squares method to improve the accuracy of AD...

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Problems solved by technology

[0003] In view of the above defects or improvement needs of the prior art, the present invention provides a method based on the least squares method to improve the accuracy of AD acquisition, aiming to solve the problem of simultaneous voltage correction of multi-channel AD chips in the prior art, which is difficult and has low accuracy. technical issues

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