CN113469039B

CN113469039B - High-speed direction identification method for grating ruler coding signals

Info

Publication number: CN113469039B
Application number: CN202110738533.XA
Authority: CN
Inventors: 李�杰; 禹诚; 杜云福; 周远成
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2022-07-05
Anticipated expiration: 2041-06-30
Also published as: CN113469039A

Abstract

The invention discloses a high-speed direction identification method of a grating ruler coding signal, which comprises the following steps: (1) a, B buffering two phase signals; (2) a, B analyzing the two phase signals; (3) collecting A, B a signal data set; (4) extracting features; (5) creating a local solution; (6) constructing a decision tree; (7) pruning a decision tree; (8) merging decision trees; (9) and (6) processing the result. The method for identifying the high-speed direction of the photoelectric signal judges the cache data through a decision tree algorithm, obtains the judgment results of forward displacement and reverse displacement, can judge the direction result and can judge the effectiveness of the data, and quickly calculates the result through the method and a parallel decision tree method.

Description

High-speed direction identification method for grating ruler coding signals

Technical Field

The invention relates to the technical field of signal identification methods, in particular to a high-speed direction identification method for a grating ruler coding signal.

Background

An optical device consisting of a large number of parallel slits of equal width and equal spacing is called a grating. The common grating is made by etching a large number of parallel notches on a glass sheet, the notches are opaque parts, and the smooth part between the two notches can transmit light, which is equivalent to a slit. The refined grating has thousands or even tens of thousands of nicks engraved within 1cm of width. Such a grating utilizing diffraction of transmitted light is called a transmission grating, and also a grating utilizing diffraction of reflected light between two scores, such as a grating in which a plurality of parallel scores are engraved on a surface coated with a metal layer and a smooth metal surface between two scores can reflect light, is called a reflection grating. The grating is a common displacement sensor, and the currently used single-chip microcomputer encoder interface cannot stably process high-speed grating signals.

Disclosure of Invention

The present invention provides a method for identifying a high-speed direction of a coded signal of a grating ruler, so as to solve the problems proposed in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: a high-speed direction identification method of a grating ruler coding signal comprises the following steps:

(1) a, B buffering two phase signals;

(2) analyzing A, B the two phase signals;

(3) collecting A, B a signal data set;

(4) extracting features;

(5) creating a local solution;

(6) constructing a decision tree;

(7) pruning a decision tree;

(8) merging decision trees;

(9) and (4) processing the result,

the method comprises the following specific steps:

the method comprises the following steps of carrying out cache preprocessing on a grating signal, carrying out further algorithm processing on processed data, wherein an algorithm output result is a direction, and direction results have three conditions, namely a forward condition, a reverse condition and an error condition;

and outputting 1 if the local solution conditions of forward displacement of the data set meet, otherwise outputting 0, outputting 1 if the local solution conditions of reverse displacement meet the same conditions, logically or respectively performing exclusive OR on the forward and reverse displacement local solutions to obtain a data validity result, and logically or using the reverse displacement or forward result as a direction judgment result. And when the data valid result is 1, the logical OR of the reverse result represents reverse displacement, otherwise, the logical OR of the forward result represents forward displacement, and similarly, when the data valid result is 1, the logical OR of the forward result represents forward displacement, otherwise, the logical OR of the forward result represents reverse displacement.

Further, in the step (1), the data of the buffer 1 is moved to the buffer 2, and then the data of the phase a is loaded into the buffer 1, and the data of the phase B is moved to the buffer 4, and then the data of the phase B is loaded into the buffer 3, in the same way as the data of the phase a.

Compared with the prior art, the invention has the beneficial effects that: the high-speed direction identification method of the photoelectric signal judges the cache data through a decision tree algorithm, obtains the judgment results of forward displacement and reverse displacement, can judge the direction result and can judge the effectiveness of the data, and quickly calculates the result by utilizing a parallel decision tree method through the method.

Drawings

FIG. 1 is a diagram of the steps performed by the method of the present invention;

FIG. 2 is a branch decision diagram of a forward and reverse shift local solution of the present invention;

FIG. 3 is a process diagram of the forward and reverse algorithm of the present invention;

FIG. 4 is a forward and reverse algorithm pruning merge graph of the present invention;

FIG. 5 is a process diagram of the forward algorithm of the present invention;

FIG. 6 is a diagram of the reverse algorithm process of the present invention;

FIG. 7 is a forward and reverse algorithm merge diagram of the present invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, the present invention provides a method for identifying a high-speed direction of a coded signal of a grating ruler, comprising the following steps:

(1) caching A, B two phase signals, moving the data of buffer 1 to buffer 2, then loading the A phase data into buffer 1, and moving the data of buffer 3 to buffer 4, then loading the B phase data into buffer 3, wherein the B phase data has the same caching method as the A phase data;

(2) analyzing A, B the two phase signals;

(3) collecting A, B a signal data set;

(4) extracting features;

(5) creating a local solution;

(6) constructing a decision tree;

(7) pruning a decision tree;

(8) merging decision trees;

(9) and (4) processing the result,

the method comprises the following specific steps:

the data in the buffers 1, 2, 3 and 4 only have logic '0' and '1', and the data sets formed in the buffers are shown in the following tables:

serial number	Cache 1	Cache 2	Cache 3	Buffer 4	Results
						0	0	0	0	0	Invalidation
1	0	0	0	1	Reverse displacement
						2	0	0	1	0	Positive displacement of
3	0	0	1	1	Invalidation
						4	0	1	0	0	Positive displacement of
5	0	1	0	1	Invalidation
						6	0	1	1	0	Invalidation
7	0	1	1	1	Reverse displacement
						8	1	0	0	0	Displacement in the reverse direction
9	1	0	0	1	Invalidation
						10	1	0	1	0	Invalidation
11	1	0	1	1	Positive displacement of
						12	1	1	0	0	Invalidation
13	1	1	0	1	Positive displacement of
						14	1	1	1	0	Reverse displacement
15	1	1	1	1	Invalidation

The data set has eight invalid results, four forward displacement data and four reverse displacement data, local solution is needed to be carried out on the data, the data are divided into a forward displacement local solution and a reverse displacement local solution, and only two results, namely a forward local solution and an error result, exist in the forward displacement local solution; in the reverse-shifted local solution, there are only two results, reverse local solution and error. In both local solutions, errors are used as data validity bases for the local solutions. Reference is made to figures 5 and 6.

The method comprises the following steps of carrying out cache preprocessing on signals of a grating, carrying out further algorithm processing on processed data, wherein the output result of the algorithm is direction, the direction result has three conditions, namely forward, reverse and error, and because the node part of the local solution algorithm can be shared, two local solutions can be integrated according to the branch boundary algorithm to form a node array diagram as shown in the attached figure 7;

The specific steps of (4) feature extraction, (5) local solution creation, (6) decision tree construction, (7) decision tree pruning and (8) decision tree merging are as follows:

(1) data extraction process

The waveform of two-phase signals of the encoder A, B is measured, and data is read once by data jump, wherein the high level is 1, and the low level is 0. The data values are filled into a table, and as shown in a tabular form, the signal change represents A, B signal positive displacement, when the signal change is changed by 1 → 1 → 0 → 0 → 1 → 1 → 1 → 0 → 0, and the signal change of phase a is changed by 0 → 1 → 1 → 0 → 0 → 0.

(2) The signal before the signal change can be called an old signal, the signal after the signal change can be called a new signal, and the following data sets can be obtained according to the waveform change:

(3) the algorithm is divided into a forward displacement local solution and a reverse displacement local solution, and a decision branch of the forward displacement is listed, as shown in figure 2.

(4) Referring to fig. 3, a decision tree for forward and reverse shift local solutions is shown.

(5) Referring to fig. 4, a decision tree is pruned and integrated.

(6) Referring to FIG. 7, the decision tree can process data in parallel and combine results to make the result single.

In addition, when A is not 0, namely a segment of signal is randomly intercepted or a signal is started from 1, the result is the same after the algorithm is processed.

The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A high-speed direction identification method of a grating ruler coding signal comprises the following steps:

(1) a, B buffering two phase signals;

(2) analyzing A, B the two phase signals;

(3) collecting A, B a signal data set;

(4) extracting features;

(5) creating a local solution;

(6) constructing a decision tree;

(7) pruning a decision tree;

(8) merging decision trees;

(9) result processing, characterized by: the method comprises the following specific steps:

outputting 1 if the local solution conditions of forward displacement of the data set meet, otherwise outputting 0, outputting 1 if the local solution conditions of reverse displacement meet the same conditions, outputting 1 if the local solution conditions of forward displacement and reverse displacement meet the same conditions, respectively logically or respectively carrying out exclusive OR on the forward and reverse displacement local solutions to obtain a data validity result, and logically or using the reverse displacement result or the forward result as a direction judgment result; and when the data valid result is 1, the logical OR of the reverse result represents reverse displacement, otherwise, the logical OR of the forward result represents forward displacement, and similarly, when the data valid result is 1, the logical OR of the forward result represents forward displacement, otherwise, the logical OR of the forward result represents reverse displacement.

2. The method for identifying the high-speed direction of the coded signal of the grating ruler according to claim 1, wherein the method comprises the following steps: in the step (1), the data of the buffer 1 is moved to the buffer 2, then the data of the phase A is loaded into the buffer 1, and the data of the phase B is the same as the data of the phase A in the buffer method, the data of the buffer 3 is moved to the buffer 4, and then the data of the phase B is loaded into the buffer 3.