Virtual watch plate based pointer reading identifying method

Abstract

The invention discloses a GNSS carrier loop circuit tracking method based on a stochastic resonance algorithm. According to the invention, the signal to noise ratio of receiving signals is increased by integral accumulation and multiplication feedback treatment on input signals; rough tracking of frequency of the receiving signals is performed by utilizing a second-order frequency locking loop; and precise tracking is performed on the signals subjected to rough tracking by adopting a third-order phase locking loop. Therefore, precise carrier loop circuit tracking on the GNSS signals is realized in a low carrier-to-noise ratio. According to the invention, an advantage of the stochastic resonance algorithm in an aspect of improving the signal to noise ratio and an advantage of anti-interference and robustness of the cooperation of the second order frequency locking loop and the third-order phase locking loop are integrated effectively. The method is simple in hardware implementation and stable in signal tracking, and can realize stable and reliable tracking of highly dynamic satellite signals by a receiver in a severe environment.

Description

technical field [0001] The invention relates to the fields of machine vision technology and instrumentation technology, in particular to a method for recognizing pointer meter readings based on a virtual dial. Background technique [0002] The precision pointer meter has intuitive reading, simple structure, convenient use and high cost performance, and has been widely used in production practice. In order to ensure production quality and production safety, the instrument needs to be calibrated regularly to ensure its accuracy. Because the precision pointer table has special requirements when reading, the manual verification process takes a long time, and it is easy to introduce errors and affect the verification accuracy. [0003] After years of research on automatic recognition of pointer meter readings, the basic theory and application have developed to a certain extent, and the automatic recognition of industrial low-precision pointer meter readings has entered the pract...

AI Technical Summary

Problems solved by technology

Some methods studied in recent years use the Hough transform to detect the position information of the pointer line and the scale line, but the calculation of the image processing is large, and it is easily affected by noise interference, and the detected position information of the pointer line and the scale line is inaccurate. Seriously affects the accuracy and speed of reading recognition

Images