CN102062615B - Position coding method of single-code channel - Google Patents

Abstract

The invention relates to a position coding method of a single-code channel, which comprises the following steps of: setting a coding graph and dividing the coding graph into a plurality of coding zones, wherein each coding zone comprises a position code and a zone mark position; each position code comprises at least one first code word and one second code word; each code word comprises a first code element and a second code element, and the width of the first code element is identical to that of the second code element; the arrangement sequence of the first code element is opposite to that of the second code element in the first code word and the second code word; and the zone mark position comprises a third code element, wherein the width of the third code element is more than or less than that of the first code element. In the invention, coding stripes are easy to distinguish, and the coding and the decoding are simpler without easily generating an error.

Description

Single track position encoding method

【Technical field】

The invention relates to a position coding method, in particular to a single code track position coding method applied in a position coder.

【Background technique】

Position encoders are encoders that measure position and displacement. According to the type of measurement, it can be divided into linear encoder and disc encoder, which are used to measure the geometric quantity of length and angle respectively.

At present, in the photoelectric displacement measurement, the incremental counting method and the absolute position encoding method are usually used. The incremental counting method counts the pulse sequence generated when two gratings move relative to each other, and uses the directional cumulative number to represent the displacement change. The principle of this method is simple, and the process flow of all gratings is short and the cost is low. However, there are many disadvantages in this method: such as poor data reliability, once the cumulative counting error occurs, this error will be stored until the end of the measurement; and if a power failure occurs during the measurement, all recorded data will be immediately lost and cannot be recovered.

The absolute position coding method is a code that describes a specific rule on a piece of grating, and all positions to be measured have a unique code corresponding to it, and when it is powered off and powered on again, this correspondence remains unchanged, thus ensuring The reliability of the data is guaranteed, and there is no problem of count loss.

However, the currently commonly used multi-track absolute position encoder has the technical problems of large size and difficult installation, and in order to improve its accuracy, the number of code tracks must be enlarged, which makes the manufacturing process more complicated. With the development and progress of technology, single-code absolute encoder is the main goal of our development. Because of the information concentration of the single-track absolute encoder, the design of the encoding itself and the process of information collection become the difficulty and focus of the research. The existing single-track absolute coding methods generally have problems such as difficult identification of coding stripes, cumbersome coding and decoding, and prone to errors.

【Content of invention】

In order to solve the technical problems that the coding stripes in the single-code-track absolute coding method in the prior art are difficult to distinguish, and the coding and decoding are cumbersome, the present invention provides a single-code-track that is easy to distinguish the coding stripes and has relatively simple encoding and decoding. Position encoding method.

The present invention provides a single code track position coding method, which includes: setting the coding pattern and dividing it into a plurality of code areas, each code area includes a position code and a zone flag, and each position code includes at least one first code word And at least one second code word, each code word all comprises a first code element and a second code element, and the width of this first code element and this second code element is the same, and the first code word and the second code word The arrangement order of the first symbol and the second symbol in is opposite, and the area flag includes a third symbol whose width is larger or smaller than the width of the first symbol.

The width of the third symbol of the zone flag is at least two widths of the first symbols.

The third symbol of the zone flag located in the odd sequence code area is at least two first symbols, and the third symbol of the zone flag positioned in the even sequence code zone is at least two second code elements Yuan.

The third code element of the zone flag located in the odd sequence code area is at least two second code elements, and the third code element of the zone flag positioned in the even sequence code area is at least two first code elements Yuan.

The third symbol for which the zone flag is set is represented by the adjacent first symbol or second symbol, and the number of settings is at least two.

The first code element or the second code element of the code word in the same code area are adjacent to the area flag, and the third code element of the area flag is set to be at least two first code elements or At least two second symbols.

The first code element or the second code element of the code word located in the adjacent code area is adjacent to the area flag, and the third code element of the area flag is set to be at least two first code elements or at least two a second code element.

Both the first code word and the second code word of the position code are coded by Gray code.

If the value represented by the position code is an even number, then the code word of the position code is obtained by inverting the Gray code corresponding to the even value.

If the value represented by the position code is an odd number, the code word of the position code is obtained by inverting the Gray code corresponding to the odd number value.

Compared with the prior art, the main beneficial effects of the single code track position coding method of the present invention are:

(1). The area mark bit in each code area is different from the encoding stripe width of the adjacent position code code word, and the difference is obvious and easy to distinguish. In addition, the encoding and decoding of the present invention are relatively simple and less prone to errors.

(2). In the coding method in the embodiment of the present invention 4, it carries out inverse processing to the code element of position code according to the coding of Gray code, in its application data processing process, is beneficial to the collection of data, and can reduce data Errors in processing.

【Description of drawings】

Fig. 1 is a schematic diagram of a partial code area in the form of linear coding of the coding pattern in Embodiment 1 of the single code track position coding method of the present invention.

Fig. 2 is a schematic diagram of a part of the code area in the form of disk coding of the coding pattern in Embodiment 1 of the single code track position coding method of the present invention.

【Detailed ways】

Example 1

As shown in Fig. 1, a single code track position encoder is provided with an encoding pattern. The coding pattern adopts the form of linear coding, which is provided with a plurality of white stripes 80 and black stripes 90 arranged in parallel and alternately. Wherein, the black barcode 90 represents an opaque barcode, and the white barcode 80 represents a light-transmitting barcode. The single code track position coding method includes: setting the coding pattern and dividing it into a plurality of code areas, each code area includes a position code and a zone flag; each position code includes a first code word and a first code word Two code words; each code word all comprises a first code element and a second code element, the width of this first code element and this second code element is set to be identical, the first code word and the second code element in the second code word The arrangement order of the first symbol and the second symbol is opposite; the area flag includes a third symbol whose width is different from that of the first symbol. Each position code may also include a plurality of first codewords and a plurality of second codewords.

When the first symbol is a black stripe, the second symbol is a white stripe; when the first symbol is a white stripe, the second symbol is a black stripe. The third symbol is a white stripe or a black stripe with a width different from that of a first symbol. Wherein, the width of the stripe representing the third symbol is larger or smaller than the width of the stripe representing the first symbol. The first code word is set to be arranged in the order of the first code element and the second code element, then the second code word is arranged in the order of the second code element and the first code element; the first code word is arranged in the order of the second code word The order of the code element and the first code element is arranged therein, and then the second code word is arranged therein in the order of the first code element and the second code element. In binary coding, when the value represented by the first code word is set to 1, the value represented by the second code word is 0; when the value represented by the first code word is set to 0, the second code word The value represented is 1. The first codeword and the second codeword of the position code can also both be coded by Gray code.

In the coding pattern shown in Fig. 1, taking any one of the code areas as an example, each position code 20 of the code area 10 includes two first code words 40 and a second code word 50, specifying its first code word The binary value represented by 40 is 0, the binary value represented by the second code word 50 is 1, the first code element is white stripe 80, the second code element is black stripe 90, then the first code word 40 corresponds to white stripe 80 The order of the black stripes 90 is arranged therein, and the order of the second codeword 50 corresponding to the black stripes 90 and the white stripes 80 is arranged therein. Wherein, the white stripes 80 and the black stripes 90 have the same width. The area flag 30 of the code area 10 includes a third code element 60, which is a white stripe (not shown) whose width is twice the width of the white stripe 80 representing the first code element. As can be seen from the above, according to the arrangement sequence of the black stripes 90 and white stripes 80 of the position code 20 in the coding pattern, the binary value represented by the position code 20 of each code area 10 can be obtained.

As shown in Figure 2, the encoding pattern of the encoder can also be in the form of disc encoding. Figure 2 shows part of the disk format, and the main difference between it and the form of linear coding shown in Figure 1 is that the black stripes and the white barcodes are arranged alternately in a ring on the grating scale. For the coding pattern shown in FIG. 2 , its coding method is the same as the coding method in the form of linear coding shown in FIG. 1 , so the description will not be repeated here.

Example 2

The single code track position encoding method described in the present invention is roughly the same as the single code track position encoding method in Embodiment 1, and its main difference is that: the area flag bit that is positioned at the odd sequence code area is set, and the third code element Width is the width of two first code elements, and the area flag bit that is positioned at the even sequence code area, the width of its third code element is the width of two second code elements; Similarly, described For the area flag located in the odd sequence code area, the width of the third code element is the width of two second symbols, and for the area flag located in the even sequence code area, the width of the third code element is two The width of the first symbol. The width of the third symbol may also be the width of multiple first symbols or multiple second symbols.

Example 3

The single code track position coding method of the present invention is roughly the same as the single code track position coding method in embodiment 1, and its main difference is: the third code element of the zone flag bit of the code zone is set, with its adjacent Two symbol representations in a codeword. The first code element of the code word in the same code area is adjacent to the area flag, and the third code element of the area flag is set as two first code elements; The second code element of the code word in the zone is adjacent to the zone flag, and the third code element of the zone flag is set as two second code elements. The first code element of the code word located in the adjacent code area is adjacent to the area flag, and the third code element of the area flag is set as two first code elements; The second code element of the code word is adjacent to the zone flag, and the third code element of the zone flag is set as two second code elements. It can be known from the above that the width of the third symbol is the width of two first symbols or two second symbols. According to the needs of actual operation, the third symbol of the zone flag can also be set to be a plurality of first symbols or a plurality of second symbols, that is, the width of the third symbol is a plurality of first symbols or the width of a number of second symbols.

Example 4

The single code track position coding method described in the present invention is roughly the same as the single code track position coding method described in Embodiment 1, Embodiment 2 and Embodiment 3, and its main difference is that the numerical value represented by the position code as described is Even number, then the codeword of the position code is obtained after bitwise inversion of the Gray code corresponding to the even value; or the following method is adopted, if the value represented by the position code is odd, then the The code word is obtained by inverting the Gray code corresponding to the odd value bit by bit.

The single code channel position coding method of the present invention is not limited to the above-mentioned embodiment, and it may also include other modified designs, such as: the number of symbols included in the code word of the position code is not limited to two, it It can be set in multiples according to actual needs; the width of the third symbol can also be half the width of a first symbol.

The present invention provides a single code track position encoding method, compared with the prior art, the main beneficial effects of the present invention are:

(1). The area mark bit in each code area is different from the encoding stripe width of the adjacent position code code word, and the difference is obvious and easy to distinguish. In addition, the encoding and decoding of the present invention are relatively simple and less prone to errors.

(2). In the coding method in the embodiment of the present invention 4, it carries out inverse processing to the code element of position code according to the coding of Gray code, in its application data processing process, is beneficial to the collection of data, and can reduce data Errors in processing.

Claims (7)

1. the position encoded method in solid size road is characterized in that it comprises: a coded graphics is set is divided into a plurality of yards districts; Each yard district comprises a position code and a distinctive emblem position, and each position code comprises at least one first code word and at least one second code word, and each code word all comprises one first code element and one second code element; This first code element is identical with the width of this second code element; Putting in order of first code element in first code word and second code word and second code element is opposite, and this distinctive emblem position comprises one the 3rd code element, when this first code element is a black streaking; Then this second code element is an informal voucher line; When this first code element was an informal voucher line, then this second code element was a black streaking, and the 3rd code element is an informal voucher line or the black streaking that width is different from one first code element.

2. the position encoded method in solid size according to claim 1 road is characterized in that the width of the 3rd code element of described distinctive emblem position is the width of at least two first code elements.

3. the position encoded method in solid size according to claim 2 road; It is characterized in that; The 3rd code element that is positioned at the distinctive emblem position in odd number sequence code district is at least two first code elements, and the 3rd code element that is positioned at the distinctive emblem position in even number sequence code district is at least two second code elements.

4. the position encoded method in solid size according to claim 2 road; It is characterized in that; The 3rd code element that is positioned at the distinctive emblem position in odd number sequence code district is at least two second code elements, and the 3rd code element that is positioned at the distinctive emblem position in even number sequence code district is at least two first code elements.

5. the position encoded method in solid size according to claim 1 road is characterized in that, the 3rd code element of this distinctive emblem position is represented with first code element adjacent thereto or second code element, and quantity is set is at least two.

6. the position encoded method in solid size according to claim 5 road; It is characterized in that; First code element or second code element that are arranged in the same yard code word of distinguishing are adjacent with this distinctive emblem position, and the 3rd code element that described distinctive emblem position is set is at least two first code elements or at least two second code elements.

7. the position encoded method in solid size according to claim 5 road; It is characterized in that; First code element or second code element of code word that is positioned at the adjacent code district is adjacent with this distinctive emblem position, and the 3rd code element that this distinctive emblem position is set is at least two first code elements or at least two second code elements.

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