CN100470197C - Bar code for digital level bar code ruler and electronic theodolite dial and encoding and decoding method therefor - Google Patents
Bar code for digital level bar code ruler and electronic theodolite dial and encoding and decoding method therefor Download PDFInfo
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- CN100470197C CN100470197C CNB2004100611938A CN200410061193A CN100470197C CN 100470197 C CN100470197 C CN 100470197C CN B2004100611938 A CNB2004100611938 A CN B2004100611938A CN 200410061193 A CN200410061193 A CN 200410061193A CN 100470197 C CN100470197 C CN 100470197C
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Abstract
This invention relates to bar code used in digit water level code bar and electrical theodolite panel and its coding and decoding method. Its code elements are composed of a pair of light and dark strips with same order. The duty cycle of dark strips in the code elements at least two kinds and the code element with different duty cycle is named as proportion code. The multiple codes distributes as designed order to form the codes of digit water level and electrical theodolite panel which are characterized by the same width of each code element.
Description
Technical field
This technology belongs to instrument of surveying and mapping manufacturing technology field.
Background technology
The decoding principle of digital level bar yardstick mainly contains correlation method, geometric method and phase method at present, also has some additive methods.Typical case's representative of correlation method is the leica instrument of Switzerland, and scale is directly encoded with the black and white scale-of-two, the patent No.: DE0019530788C1; Typical case's representative of geometric method is the Trimble instrument, and scale adopts quarter-phase binary coding, the patent No.: DE0019826873C1; The typical case of phase method representative is the patent of Japanese TOPCON: 93121271.5,01137724.0 and the patent 98104318.6 of Japanese SOKKIA, and the scale bar code is made up of the wide sign indicating number preface of the Sine Modulated of different cycles that is subjected to of some group codes; Also have the patent of some additive methods such as the wide digital modulation of equidistant code sign indicating number of Japanese SOKKIA, the patent No. 98125342.3; Mr.'s Yang Junzhi the wide Sine Modulated of equidistant code sign indicating number, the patent No. 03153286.1; Mr.'s Zhao Luocheng images match principle, the patent No. 200310111409.2.
Make a general survey of art methods, cut both ways, or the bar code complexity, scale is made difficulty; Coding and decoding computing complexity, calculated amount is big and measuring speed is slow or hardware cost is high.
Summary of the invention
The object of the present invention is to provide the bar code and the coding-decoding method thereof of a kind of digital level bar yardstick or electronic theodolite scale, have the decoding computing simple, the advantage that calculated amount is little and measuring speed is high.
The bar code of digital level bar yardstick of the present invention or electronic theodolite scale, its code element is made up of a pair of light and shade striped, the light and shade sequence consensus, the dutycycle of dark fringe has two kinds at least in the code element, the code element of different duty is called the ratio sign indicating number, a plurality of ratio sign indicating numbers are arranged by the rule of agreement, constitute the bar code of digital level bar yardstick or electronic theodolite scale, it is characterized in that the width of each code element equates.
Aforesaid bar code is characterized in that the ratio sign indicating number has 4 kinds, and the dutycycle of its dark fringe is respectively 15%, 30%, 70% and 85%.
Aforesaid bar code is characterized in that the edge delineation of bar code code element has artificial discernible indicating value.
The coding-decoding method of aforesaid bar code, it is characterized in that the ratio sign indicating number has 4 kinds at least, and by dutycycle less than 50% be divided into two classes greater than 50%, during Code And Decode to closely all handling, to being that the boundary handles in two-stage ratio sign indicating number with dutycycle 50% at a distance in 4 kinds of ratio sign indicating numbers.
Principle of the present invention and beneficial effect
The bar code scaleplate of digital electronic level or electronic theodolite (total powerstation) scale, the coding method of its bar code is the ratio sign indicating number that equates with symbol width as carrying yard, the measurement sign indicating number Comparative Examples sign indicating number of rule (comprising pseudorandom rule, sinusoidal rule etc.) of agreement is carried out duty ratio modulation, make the measurement sign indicating number modulation of rule of agreement colonize among the ratio sign indicating number.
The present technique method is the code phase method, the main point of several method was before its technical method was different from: the code phase method is used pseudo random sequence code (or measurement sign indicating number of other agreement rules) directly to decipher and is obtained the bigness scale value, and go out the accurate measurement value with the phase measurement of silk in the relative electronics of code element, thick, smart observed reading is connected just obtains observed result then.The technological core of realizing this decoding principle is that this coding method is wide equidistant code dutycycle digital modulation: promptly the ratio sign indicating number that equates with symbol width is as carrying yard, pseudo-random code (or measurement sign indicating number of other agreement rules) Comparative Examples sign indicating number is carried out duty ratio modulation, make the pseudo-random code modulation colonize among the ratio sign indicating number.Ratio sign indicating number symbol width equates just to make certainly the distance at adjacent code element center also to equate.Constant symbol width has made things convenient for the demodulation of pseudo-random code, the huge operand of having avoided the two-dimensional correlation computing of correlation method fully, also avoid the scale of geometric method and phase method and made defectives such as complexity, it is very convenient that constant symbol width of while makes sighting distance resolve, and manufacturing and designing also of instrument simplified greatly.And because the code element of constant width has been arranged, the levelling pole of this method design can also be realized optics manual simulation reading simultaneously, and the delineation indicating value makes the ordinary optical spirit-leveling instrument also can use this levelling pole corresponding to the edge of each code element, checks more convenient.
And the angle measurement of electronic theodolite (total powerstation) equally also can be used this coding method.
The great advantage that this coding method is applied to digital electronic level or electronic theodolite (total powerstation) is exactly: decode and calculate all simple and fasts, the manufacturing of bar code scaleplate or scale is also very easy, greatly facilitates manufacturing and designing of instrument.
Description of drawings
Fig. 1 is the code element and the bar-code structure synoptic diagram of one embodiment of the invention.
Fig. 2 is the synoptic diagram of the coding-decoding method of the embodiment of the invention.
Fig. 3 is that digital electronic level is measured the imaging synoptic diagram.
Concrete embodiment
The present invention will be described in detail below in conjunction with accompanying drawing.
The code element of one embodiment of the invention and bar-code structure are as shown in Figure 1.
1, code element: each code element all is made up of a pair of light and shade striped, the light and shade sequence consensus, and each symbol width is all identical---and be that the bright fringe width adds the dark fringe width and equals fixed value; The bright of present embodiment is in vain, and be dark for black, but light and shade means the culvert meaning of optical brightness contrast, is white and black not only, also comprises the color configuration that other brightness have light and shade difference, for example yellowish and dark blue etc.
2, ratio sign indicating number: the code element of different duty is called as the ratio sign indicating number, realizes coding with the width ratio value of light and shade striped in the ratio sign indicating number.Four kinds of ratio sign indicating numbers that Fig. 1 of present embodiment exemplifies correspond respectively to number 0,1,2 and 3, and the dutycycle of the relative symbol width of its dark fringe is respectively 20%, 40%, 60% and 80%.Certainly the light and shade reversed order of striped is come also to be fine, every kind of sign indicating number is decided to be other duty proportionate relationships approximately also is fine,, the kind of code element increased and reduce also being fine such as 15%, 30%, 70% and 85%.3, Code And Decode: as shown in Figure 2.
Bigness scale: the first step of bigness scale will come out to finish first step decoding with measuring sign indicating number demodulation from the ratio sign indicating number exactly.
Consider actual measurement of the level use in sighting distance widely different, far and near the visual field size is also far and near and different with distance and different with distance for telescope imaging resolving power, the present technique method is taked far and near classification compatible decoding.Here exemplify the far and near classification compatible decoding rule of 4 grades of codings: at first get 4 grades of ratio sign indicating numbers, 4 kinds of different duty proportionate relationships are corresponding numerical codes 0,1,2 and 3 respectively, and perhaps 00,01,10 and 11, getting a minimum sign indicating number segment length is 5 code elements, then can realize 4
5=1024 kinds of different codings, the cycle that so only needs to guarantee pseudo-random code enough gets final product.When myopia is apart from measurement like this, as long as range of telescope can observe 10 binary pseudo-random code sections (symbol demodulation goes out 2 binary codes) that 5 code elements (if symbol width is 1cm then is the width of 5cm) of levelling staff can demodulate nearly sign indicating number; And when long sight distance is measured, imaging is dwindled, being difficult to accurately realization differentiates 4 grades of ratios of code element, differentiate with regard to directly carrying out 2 grades of ratios, promptly 0 and 1 of nearly sign indicating number all is decoded as 0 of sign indicating number far away, and 2 and 3 of nearly sign indicating number all is decoded as 1 of sign indicating number far away, and such when remote, as long as range of telescope can observe 10 binary pseudo-random code sections (code element only demodulates 1 binary code) that 10 code elements (if symbol width is 1cm then is the width of 10cm) of levelling staff can demodulate sign indicating number far away.Accompanying drawing 2 expression be exactly certain segment mark chi antimetropia apart from the time nearly sign indicating number and the corresponding relation of two kinds of decode values of sign indicating number far away.
It is to be noted, for guaranteeing effective realization of far and near classification compatible decoding technology, guarantee the reliable of remote time decoding, the ratio sign indicating number time need be taked ratio contrast enhancement measures at coding---and four kinds of sign indicating numbers are not that strictness is followed 20%, 40%, 60% and 80% dutycycle and evenly increased progressively proportionate relationship in other words, but the duty ratio gap of sign indicating number 0,1 and sign indicating number 2,3 is widened, for example the duty ratio is respectively 15%, 30% and 70%, 85%, can see in the accompanying drawing 2 that the black streaking ratio of sign indicating number 0,1 and sign indicating number 2,3 obviously widens the benefit that bring the long sight distance resolving power back.
After having finished the first step decoding of measuring sign indicating number, next step just directly produces the bigness scale value to nearly sign indicating number or the sign indicating number decoding far away that obtains, and interpretation method can be used look-up table, also can realize according to sign indicating number preface Equation for Calculating, can also adopt the one-dimensional correlation algorithm.Nearly sign indicating number and sign indicating number sign indicating number section far away are corresponding one by one and do not repeat also to guarantee simultaneously that the sign indicating number section and the monambiguity corresponding relation of bigness scale value are necessary.
Accurate measurement: the accurate measurement process is to carrying the measuring process of the start-phase of silk in the relative electronics of sign indicating number (ratio sign indicating number).
No matter far sign indicating number is near yard, all will carry out the detection at code element edge during decoding and obtain code phase, calculate the mean breadth of code element simultaneously, PHASE DISTRIBUTION according to silk in the position establishment of silk in mean breadth value and the electronics, obtain the average phase-difference of code phase and middle silk phase place then, the developed width on scale is extrapolated the accurate measurement value by phase differential and code element again.What the PHASE DISTRIBUTION of code phase and middle silk was expressed in the accompanying drawing 2 is exactly the signal of code phase accurate measurement principle.Here the accurate measurement principle with the geometric method phase method is similar.
Sighting distance is resolved
Because symbol width is known, code element is also measured at the imaging width of spirit-leveling instrument, and the telescopical focal length of spirit-leveling instrument (with the image distance approximately equal) is also known, can obtain sighting distance according to the proportionate relationship of similar triangles.See accompanying drawing 3.
4, artificial reading
Identical with the number reading method of ordinary optical spirit-leveling instrument.
5, the angle measurement of electronic theodolite (total powerstation) is used
The position relative fixed of the scale of electronic theodolite (total powerstation) and optical system, sensor uses this coding method needn't consider far and near sign indicating number compatibling problem to scale, uses simpler.
Claims (4)
1, the bar code of a kind of digital level bar yardstick or electronic theodolite scale, its code element is made up of a pair of light and shade striped, the light and shade sequence consensus, the dutycycle of dark fringe has two kinds at least in the code element, the code element of different duty is called the ratio sign indicating number, a plurality of ratio sign indicating numbers are arranged by the rule of agreement, constitute the bar code of digital level bar yardstick or electronic theodolite scale, it is characterized in that the width of each code element equates.
2, bar code as claimed in claim 1 is characterized in that the ratio sign indicating number has 4 kinds, and the dutycycle of its dark fringe is respectively 15%, 30%, 70% and 85%.
3, bar code as claimed in claim 1 or 2 is characterized in that the edge delineation of bar code code element has artificial discernible indicating value.
4, as the coding-decoding method of described any one bar code of claim 1 to 3, it is characterized in that the ratio sign indicating number has the M kind at least, M 〉=4, and by dutycycle less than 50% be divided into two classes greater than 50%, during Code And Decode to closely all handling, to being that the boundary handles in two-stage ratio sign indicating number with dutycycle 50% at a distance in M kind ratio sign indicating number.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156851A (en) * | 2011-04-29 | 2011-08-17 | 天津理工大学 | Length scaleplate with identification bar code of standard length scale and data collection method |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672662B (en) * | 2008-09-08 | 2013-03-27 | 方强 | Coding system for digital level |
| CN101871777B (en) * | 2010-05-07 | 2012-01-25 | 樊小鹏 | Bar code suitable for measurement and measuring instrument |
| CN102261926B (en) * | 2011-05-06 | 2013-04-17 | 常州市新瑞得仪器有限公司 | Coding and decoding methods of digital level bar code ruler |
| CN103473580A (en) * | 2012-06-07 | 2013-12-25 | 北京博新精仪科技发展有限公司 | Absolute coding method and bar code thereof |
| CN105809228B (en) * | 2016-03-29 | 2019-05-17 | 天津赛特测机有限公司 | A kind of measurement bar code, measured yardstick and measuring system |
| CN107014348B (en) * | 2017-03-31 | 2020-08-04 | 武汉理工大学 | Scale bar code for leveling rod of distance measuring electronic level and encoding and decoding method thereof |
| CN107044008A (en) * | 2017-04-25 | 2017-08-15 | 杰克缝纫机股份有限公司 | The detection control apparatus and detection method of a kind of sewing machine shuttle peg |
| CN107941196B (en) * | 2017-10-20 | 2019-08-13 | 南京航空航天大学 | A kind of angle measurement signal processing method of individual pen absolute coding type electronic theodolite |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156851A (en) * | 2011-04-29 | 2011-08-17 | 天津理工大学 | Length scaleplate with identification bar code of standard length scale and data collection method |
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