CN106772413A - A kind of automatic survey phase device - Google Patents
A kind of automatic survey phase device Download PDFInfo
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- CN106772413A CN106772413A CN201611240746.5A CN201611240746A CN106772413A CN 106772413 A CN106772413 A CN 106772413A CN 201611240746 A CN201611240746 A CN 201611240746A CN 106772413 A CN106772413 A CN 106772413A
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- 238000012360 testing method Methods 0.000 description 2
- 238000012300 Sequence Analysis Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
- G01S17/32—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S17/36—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated with phase comparison between the received signal and the contemporaneously transmitted signal
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measuring Phase Differences (AREA)
Abstract
The invention provides a kind of automatic output connection phase-detecting module surveyed phase device, including expansion Corner Block List Representation and phase-detecting module, expand Corner Block List Representation.The expansion Corner Block List Representation is made up of d type flip flop, and what its pulse signal input terminal was received is reference signal, output end connection phase-detecting module.The phase-detecting module includes the first d type flip flop, the second d type flip flop and a NAND gate with Schmidt's characteristic, the positive phase output end of Corner Block List Representation d type flip flop is expanded in the pulse signal input terminal connection of first d type flip flop, the pulse signal input terminal of second d type flip flop receives distance measuring signal, its R input connects the positive phase output end of first d type flip flop, and the antiphase output end of the second d type flip flop connects an input of NAND gate and the R input of the first d type flip flop simultaneously.The present invention surveys the solution of phase by expanding angle, realizes that no matter large or small angle is all the phase-detecting near 360 °, for 720 ° of cycles, does not belong to error-prone big low-angle phase-detecting, but middle isogonism phase-detecting.
Description
Technical field
The invention belongs to field of linear dimension measurement technology, and in particular to a kind of laser automatic measuring phase device, for target
Measurement of the object to the absolute distance between measurement apparatus.
Background technology
Laser Range Finding Based on Phase technology be by measure modulation laser flown between testing distance the phase place change that causes come
Measurement distance.Range-measurement system is compared by the initial phase for detecting transmission signal and the initial phase for receiving signal, then
To the distance between measured target and range-measurement system value.The general principle of electromagnetic distance measurement is propagated in atmosphere using electromagnetic wave
Speed be known this characteristic, determine electromagnetic wave and try to achieve distance value apart from the time of upper roundtrip propagation tested.
As shown in figure 1, being placed in the instrument of A points, launch electromagnetic wave, returned by the reflector of B points and for the instrument of A points connects
Receive.If electromagnetic wave is t apart from the time of upper roundtrip propagation in AB2D, then can be written as apart from D：
In formula, c is the aerial spread speed of electromagnetic wave, about 3 × 108m/s.As long as electromagnetic wave can be obtained accurately
Round trip propagation time t2D, then can be obtained apart from D by formula (1), if the modulated light wave that frequency f is, toward back pass on testing distance AB
The time broadcast is t2D, its phase shift is Φ, and Fig. 2 is its waveform expanded view.It is located at initial time t1The modulation light light intensity of transmitting is
I1=Asin (ω t1+φ0)
The time of reception modulates light intensity
Then receive the phase difference with x time
Formula (2) is substituted into formula (1) then to obtain：
Formula (3) is the fundamental formular of ranging phase method.
Ranging phase method principle by sinusoidal signal a cycle Φ in ranging phase method system as shown in figure 9, be referred to as one
Chi is surveyed, chi length is surveyed and is designated as L.It is assumed that f=15MHz, then corresponding survey chi length is L=10m.Now, m is carried out to surveying chi length
Part subdivision, will obtain the resolution ratio of distance measuring signal.For example surveying chi to 10m carries out 10000 parts of subdivisions of (m=10000), will obtain
Resolution of ranging is 1mm.
Ranging phase method system is by transmission signal erAs reference signal, the reception signal e returned with range findingm(hereinafter referred to as
Distance measuring signal) enter line phase and relatively obtain phase difference △ φ=er-em, main pulse is filled arteries and veins the used time in this phase difference
Punching is counted, and count value is n, and the numerical value for obtaining can be converted into distance value.Reduction formula is：
For example, it is L=10m to survey chi length, distance measuring signal a cycle is mixed down to 1.5KHz, when main pulse signal be
15MHz, 10000 frequency dividings, i.e. m=10000 are subdivided into distance measuring signal, then resolution of ranging is 1mm.Assuming that filler pulse number
Count value n=200, then now corresponding phase difference △ φ=er-em=7.2 °, distance value is converted into for D=200mm.
The method that prior art is directly compared using transmission signal and phase of received signal, phase process is surveyed in automatic digital
In, because the resolution ratio of phasometer has certain limit, and circuit noise, ambient noise influence etc., when range difference is close
When 0 ° (low-angle) or 360 ° (wide-angle), in fact it could happen that mistake surveys phase.Its form of expression, deviates right value or display
Numeral daps, discrete very big.
The content of the invention
In view of this, the present invention is directed to propose a kind of automatic survey phase device, to solve prior art when phase difference is measured
Due to occurring when phase difference larger (wide-angle) or smaller (low-angle), it may appear that survey phase mistake, or survey it is mutually inaccurate
Problem.
Occur being analyzed the reason for mistake surveys phase：
1st, the wrong phase-detecting that phase-detecting meter limited resolution causes
Fig. 3 is small angle measurement situation, there is reference signal erWith distance measuring signal emTrailing edge phase-detecting can obtainBut by
In phasometer limited resolution in itself, such as rest-set flip-flop has certain operating rate, works as erTrailing edge 2 is output as phasometer
The instant of " 1 ", emTrailing edge 2 arrive again, phasometer should turn over 1 turn " 0 ", but rest-set flip-flop has little time to reset, and signal is with regard to mistake
Go, so that phasometer is still " 1 ", work as erTrailing edge 3 is then just triggered, and phasometer is changed into " 0 ", that is, in there is Fig. 3's
Situation, small phase angleBecome big phase angleAlso another situation, in such as Fig. 6-4 at E, erTrailing edge 4 also comes
Not as good as allowing phasometer set (set), emSignal 4 just comes, and this is may to lose a phase square wave, produces mistake, causes
Survey phase error.
Fig. 4 is that wide-angle measures situation.Normal condition detects phase square waveAnd situation is quite different at P, work as emDecline
Phase is set to be calculated as " 0 ", e along 3rTrailing edge 3 is come immediately, and phasometer has little time to become " 1 ", " 0 " is still kept, so as to just lost one
Individual phase square wave.Situation in figure at E is then：emTrailing edge 5 have little time to make phasometer to become " 0 ", erTrailing edge 5 just make phase
Position is calculated as " 1 ", the phase measuredPhase is surveyed so as to mistake repeatedly occur.
2nd, circuit noise and modulation light transmit influenceed by atmospheric agitation in an atmosphere, will shake distance measuring signal.
When phase square wave is big low-angle, the wide-angle that this shake is likely to result in phase becomes low-angle, and low-angle becomes big angle
Degree.Analysis method ibid, is no longer described in detail herein.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
A kind of automatic output connection phase-detecting module surveyed phase device, including expansion Corner Block List Representation and phase-detecting module, expand Corner Block List Representation.
Further, the expansion Corner Block List Representation is made up of d type flip flop, and what its pulse signal input end received is reference signal,
Output end connects phase-detecting module.
Further, the d type flip flop for expanding Corner Block List Representation selection model 74hc74.
Further, the phase-detecting module includes the first d type flip flop, the second d type flip flop and one with Schmidt's characteristic
The positive phase output end of Corner Block List Representation d type flip flop is expanded in NAND gate, the pulse signal input terminal connection of first d type flip flop, described
The pulse signal input terminal of the second d type flip flop receives distance measuring signal, and its R input connects the positive phase of first d type flip flop
Output end, an input of connection NAND gate and the R of the first d type flip flop are defeated simultaneously for the antiphase output end of the second d type flip flop
Enter end；Another input connection time scale pulse signal of the NAND gate.
Further, first d type flip flop and the selection of the second d type flip flop is realized by double D trigger CD4013.
Relative to prior art, the present invention has the advantage that：
(1) the application proposes to expand the solution that phase is surveyed at angle, expands angle phase-detecting and arrives original 360 ° of phase-detecting period expansion
720 °, make the original small phase difference near 0 °Plus 360 °, just belong to moderate angles phase-detecting；And it is original near 360 °
Phase angleIt is constant, isogonism phase-detecting in also belonging to.Thus from the point of view of the effect of phase-detecting after expanding angle, no matter large or small angle is all attached at 360 °
Nearly phase-detecting, for 720 ° of cycles, does not belong to error-prone big low-angle phase-detecting, but middle isogonism phase-detecting.
(2) the automatic survey phase apparatus structure letter for expanding angle survey phase is answered, reasonable in design, is easily realized and popularization and application.
Brief description of the drawings
The accompanying drawing for constituting a part of the invention is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate, for explaining the present invention, not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is range finding schematic diagram；
Fig. 2 is ranging phase method schematic diagram；
Fig. 3 is that low-angle surveys phase situation；
Fig. 4 is that wide-angle surveys phase situation；
Expand angle phase-detecting when Fig. 5 is low-angle；
Expand angle phase-detecting when Fig. 6 is wide-angle；
Fig. 7 is the automatic circuit diagram for surveying phase device described in the embodiment of the present invention；
Fig. 8 is the automatic circuit sequence analysis chart for surveying phase device described in the embodiment of the present invention；
Fig. 9 is ranging phase method theory diagram.
Specific embodiment
It should be noted that in the case where not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Mutually combination.
Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
The present embodiment surveys phase device automatically, as shown in fig. 7, comprises expanding Corner Block List Representation and phase-detecting module, expands the output of Corner Block List Representation
Connection phase-detecting module；
The expansion Corner Block List Representation is made up of d type flip flop, and what its pulse signal input end received is reference signal, output end connection
Phase-detecting module, the present embodiment expands the d type flip flop of Corner Block List Representation selection model 74hc74；By transmission signal or reception signal frequency
Half is reduced, carries out expanding angle phase-detecting；
The phase-detecting module includes the first d type flip flop, the second d type flip flop and a NAND gate with Schmidt's characteristic, institute
The positive phase output end of Corner Block List Representation d type flip flop, the 2nd D triggerings are expanded in the pulse signal input terminal connection for stating the first d type flip flop
The pulse signal input terminal of device receives distance measuring signal, and its R input connects the positive phase output end of first d type flip flop, the
The antiphase output end of 2-D trigger connects an input of NAND gate and the R input of the first d type flip flop simultaneously；It is described
Another input connection time scale pulse signal of NAND gate, the output end linkage counter of the NAND gate；The phase-detecting mould
Block is used for frequency phase-detecting, is counted by the automatic filler pulse of the counter for connecting.First d type flip flop and second described in the present embodiment
D type flip flop selection is realized by double D trigger CD4013.
Original 360 ° of phase-detecting period expansion to 720 °, is made the original small phase near 0 ° by the expansion angle phase-detecting of the present embodiment
Potential differencePlus 360 °, just belong to moderate angles phase-detecting；And the original phase angle near 360 °It is constant, isogonism inspection in also belonging to
Phase.Thus from the point of view of the effect of phase-detecting after expanding angle, no matter large or small angle is all the phase-detecting near 360 °, for 720 ° of cycles, all
Do not belong to error-prone big low-angle phase-detecting, but middle isogonism phase-detecting.
Fig. 5 is low-angle situation, using expanding the d type flip flop of Corner Block List Representation by reference signal erWith distance measuring signal emCycle expand
Greatly to 720 ° (new 360 °), i.e. e 'rWith e 'm.By e 'mParaphase is used as the distance measuring signal for controlling phase-detectingBy e 'rWithThan mutually obtaining
Phase-detecting square waveThis 180 ° phase, overflows automatically during counting, must differ in factFig. 6 is wide-angleFeelings
Condition, also with the e ' expanded behind anglerWith control phase-detecting distance measuring signalThan phase, phase-detecting square wave is directly obtained
Due to extending whole cycle when expanding angle phase-detecting,Paraphase is also original 360 ° of cycles, thus avoids waveform and account for
Sky is shown in Fig. 8 than the phase-detecting error do not brought not etc., the Time-Series analysis figure of the present embodiment circuit.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Within god and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (5)
- It is 1. a kind of to survey phase device automatically, it is characterised in that：Including expanding Corner Block List Representation and phase-detecting module, expand the output connection inspection of Corner Block List Representation Phase module.
- 2. automatic survey phase device according to claim 1, it is characterised in that：The expansion Corner Block List Representation is made up of d type flip flop, its What pulse signal input end received is reference signal, output end connection phase-detecting module.
- 3. automatic survey phase device according to claim 2, it is characterised in that：The expansion Corner Block List Representation selection model 74hc74 D type flip flop.
- 4. automatic survey phase device according to claim 1, it is characterised in that：The phase-detecting module include the first d type flip flop, Angle is expanded in second d type flip flop and a NAND gate with Schmidt's characteristic, the pulse signal input terminal connection of first d type flip flop The positive phase output end of module d type flip flop, the pulse signal input terminal of second d type flip flop receives distance measuring signal, its R inputs The positive phase output end of end connection first d type flip flop, the antiphase output end of the second d type flip flop connects NAND gate simultaneously The R input of one input and the first d type flip flop；Another input connection time scale pulse signal of the NAND gate.
- 5. automatic survey phase device according to claim 4, it is characterised in that：First d type flip flop and the second d type flip flop Selection is realized by double D trigger CD4013.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611240746.5A CN106772413A (en) | 2016-12-29 | 2016-12-29 | A kind of automatic survey phase device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611240746.5A CN106772413A (en) | 2016-12-29 | 2016-12-29 | A kind of automatic survey phase device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3691474A (en) * | 1970-12-04 | 1972-09-12 | Burroughs Corp | Phase detector initializer for oscillator synchronization |
| CN101387702A (en) * | 2008-10-22 | 2009-03-18 | 东南大学 | Phase laser range finder and phase inspecting method thereof |
| CN206440825U (en) * | 2016-12-29 | 2017-08-25 | 中科和光（天津）应用激光技术研究所有限公司 | A kind of automatic survey phase device |
-
2016
- 2016-12-29 CN CN201611240746.5A patent/CN106772413A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3691474A (en) * | 1970-12-04 | 1972-09-12 | Burroughs Corp | Phase detector initializer for oscillator synchronization |
| CN101387702A (en) * | 2008-10-22 | 2009-03-18 | 东南大学 | Phase laser range finder and phase inspecting method thereof |
| CN206440825U (en) * | 2016-12-29 | 2017-08-25 | 中科和光（天津）应用激光技术研究所有限公司 | A kind of automatic survey phase device |
Non-Patent Citations (1)
| Title |
|---|
| 张志强: "全站仪红外测距系统的研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
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Application publication date: 20170531 |