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A Coding and Decoding Algorithm for Two-Dimensional Absolute Position Measuring Sensor

A technology for measuring sensors and two-dimensional encoding, applied in the field of sensor encoding and decoding algorithms, can solve problems such as low efficiency, complex construction methods and decoding algorithms, and achieve the effect of improving fault tolerance.

Active Publication Date: 2021-04-02
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two-dimensional codes meet the window characteristics, their construction methods and decoding algorithms are relatively complicated, and their execution efficiency is not high.

Method used

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  • A Coding and Decoding Algorithm for Two-Dimensional Absolute Position Measuring Sensor
  • A Coding and Decoding Algorithm for Two-Dimensional Absolute Position Measuring Sensor
  • A Coding and Decoding Algorithm for Two-Dimensional Absolute Position Measuring Sensor

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] S=s 0 the s 1 ...s N-1 is the period N=2 n The n-order binary M sequence of -1 is generated based on the primitive polynomial p(D) on the n-order GF(2) field, and satisfies the following recursive formula:

[0018]

[0019] where p v ∈{0,1} is the coefficient of the primitive polynomial p(D), s -1 ,s -2 ,...,s -n as the initial condition.

[0020] S can be generated by n LFSRs (Linear Feedback Shift Registers) represented by Equation 1, such as figure 1 shown. It is formed by cascading n LFSRs, and the state of the register is the content of the current register. When the register is working, every time the discrete time increases by one time unit, the content in the register is shifted to the right by one bit, and the feedback element is shifted into the leftmost register at the same time. The output of the register generates an M ...

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Abstract

The invention discloses an encoding algorithm and a decoding algorithm for two-dimensional absolute position measurement sensors. The encoding algorithm comprises the following steps of: constructinga two-dimensional code on the basis of properties of M sequences; and forming the two-dimensional code by taking n orders of M sequences which are mutually converted through cyclic shift as lines, wherein the code has a window characteristic (any subarray in the code only appear for once), and sequences formed by relative cyclic shift values between adjacent lines of M sequences are called as shift sequences which also have the window characteristic. An algorithm correspondingly capable of realizing correct decoding is given to simplify two-dimensional decoding problems into one-dimensional decoding problems, so that the decoding efficiency is greatly improved; and the decoding algorithm is related to the shift sequences and has certain fault-tolerant ability. The encoding algorithm and the decoding algorithm provide theoretical and method basis for the development of the two-dimensional absolute position measurement sensors.

Description

technical field [0001] The invention relates to the field of sensor encoding and decoding algorithms, in particular to an encoding and decoding algorithm of a two-dimensional absolute position measurement sensor. Background technique [0002] Absolute sensors have the technical advantages of obtaining measurement results immediately after power-on, small cumulative error, and easy splicing. Compared with incremental measurement sensors, they have stronger applicability in geometric measurement. And reading system limitations are often difficult to achieve high-resolution, high-speed measurement. At present, absolute measurement sensors are mainly used in encoders for angle measurement. Since the angle has a natural reference of 360 degrees in a circle, angle measurement encoders can achieve high measurement accuracy. For example, HEIDENHAIN’s ECN425, EQN437 and other models can achieve 25bit Measurement resolution; in more high-resolution angle and displacement sensor produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/249
CPCG01D5/2497
Inventor 夏豪杰吴晓婷
Owner HEFEI UNIV OF TECH