Single-code-channel absolute encoding and decoding method based on dual periodic sequences

Abstract

The invention discloses a single-code-channel absolute encoding and decoding method based on dual periodic sequences. The code elements of an order m sequence and the code elements of an order m sequence are arranged in a staggered mode to form the single-code-channel absolute code , wherein, < , and are relatively prime, and and are the periods of the two sequences and . According to the single-code-channel absolute encoding and decoding method based on dual periodic sequences, the absolute positions of the code words of the single-code-channel absolute code is related to the code word ordinal number of the two m sequences and , and thus the difficulty for a pseudo random code to search for the absolute position of the code words is effectively overcome. A method combining an analytical calculation method and a table look-up method is adopted for decoding, and the method has the advantages of being small in occupied internal storage and high in decoding speed. The single-code-channel absolute encoding and decoding method is suitable for design and manufacturing of high-speed and high-accuracy linear displacement long gratings.

Description

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AI Technical Summary

Benefits of technology

This patented technology uses binary sequences with specific codes that are used instead of traditional methods like analog or digital techniques which require large amounts of space. It allows faster processing speeds while maintaining accuracy compared to existing systems.

Problems solved by technology

The technical problem addressed in this patented text relates to improving the performance and efficiency of linear motion grate sensor systems for precise measurements. Specifically, existing methods involve binary or gray codes with overlapping code symbols between them, requiring longer encoders and higher costs than true ones due to increased processing times required during decode operations. A unique approach called Double Structure Sequence Encoder (DSSE), combined both Random Code Grading Scheme(RSCS)/Determinable Codes (DFC)) and Quantum Dot Interference Distance Scale (QDIM2) offers better accuracy compared to previous designs without sacrificing redundancy.

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