Method and system for physically extracting pseudo-random code signals

Abstract

The invention relates to a method and system for physically extracting pseudo-random code signals, wherein the pseudo-random code information which has the reverse phases is marked on a substrate; an excitation source is acted on the substrate which is marked with the pseudo-random code information; a sensitivity receiving element receives electronic analog signals containing the position information, and the electronic analog signals are modulated by the pseudo-random codes on the substrate made of a specific material; the electronic analog signals are two paths of pseudo-random code signals which have the reverse phases and the equal amplitude; and the two paths of pseudo-random code signals which have the reverse phases and the equal amplitude are transmitted to the positive and negative input ends of a hysteresis comparator to finish the generation of a pseudo-random code pulse sequence. In the invention, the reliability problem and high frequency response problem of the primary signal extraction at the most front end of the single channel of a pseudo-random code displacement sensor can be solved.

Description

technical field [0001] The invention relates to a method and system for extracting original signals of displacement sensors, in particular to a method and system for extracting signals of displacement sensors based on pseudo-random code encoding. Background technique [0002] At present, the absolute sensor based on the pseudo-random code coding method has the characteristics of small size and high resolution. Compared with the traditional absolute coding method, the pseudo-random code coding method can reduce the area of ​​the code disc / scale and simplify the structure of the reading head. Reducing the size of the sensor while still maintaining the requirements of high precision and high speed. However, the pseudo-random code is aperiodic code, which cannot be amplified and extracted by the traditional Moiré fringe principle. The traditional method is usually composed of an excitation source, a specific material marked with a pseudo-random code, a sensitive receiving elemen...

AI Technical Summary

Problems solved by technology

However, the pseudo-random code is aperiodic code, which cannot be amplified and extracted by the traditional Moiré fringe principle. The traditional method is usually composed of an excitation source, a specific material marked with a pseudo-random code, a sensitive receiving element, and a voltage comparator. The slit / single magnetic head / single electrode method directly performs photoelectric / magnetoelectric / capacitance conversion, and converts the pseudo-random code information on the physical code disc / scale into electrical signals. In the case of low frequency response and low resolution , can work normally, but in the case of high frequency response and high resolution, the pseudo-random code signal extraction faces the dilemma of large interference, high bit error rate and even complete garbled codes. With the development of automation control technology and CNC machine tool technology, the absolute type The high frequency response, high resolution, and high reliability of the displacement sensor are the basic performance parameters it must have. The present invention solves the reliability problem of the original signal extraction at the front end of the pseudo-random code displacement sensor signal channel.

Images