CN103197145B - Method and system of ultrahigh resolution phase difference measurement - Google Patents
Method and system of ultrahigh resolution phase difference measurement Download PDFInfo
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- CN103197145B CN103197145B CN201310066563.6A CN201310066563A CN103197145B CN 103197145 B CN103197145 B CN 103197145B CN 201310066563 A CN201310066563 A CN 201310066563A CN 103197145 B CN103197145 B CN 103197145B
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Abstract
The invention discloses a method and a system of ultrahigh resolution phase difference measurement with phase difference correction function and based on double-coincidence detection. The method includes the steps that: a. a measurement gate is formed by means of double phase coincidence detection between two pilot frequency signals, a first phase coincidence detection and coincidence pulse generating circuit conducts phase coincidence detection to a detected frequency signal and a public frequency signal and generates coincidence pulse; b. a second phase coincidence detection and coincidence pulse generating circuit conducts phase coincidence detection to a reference frequency signal and the public frequency signal and generates coincidence pulse; c. a gate-time generating circuit generates a gate-time signal according to a received enabling signal and a received closing signal, and a single chip computer obtains phase difference of the detected frequency signal and the reference frequency signal according to count data; and d. the coincidence pulse is counted within the time range near the enabling time and closing time of the measurement gate and a corrected value of the phase difference is obtained. Lastly, the ultrahigh resolution phase difference measurement is accomplished. By means of the method and the system of ultrahigh resolution phase difference measurement, counting error is eliminated, measuring resolution ration is high, and long time drift distance is small.
Description
Technical field
The invention belongs to frequency time signal processing technology field, particularly relate to a kind of method and system with the ultrahigh resolution phase difference measurement detected based on dual conjunction that difference is revised.
Background technology
High-resolution phase difference measurements technology all has a wide range of applications in scientific research and engineering practice, plays an important role in measurement and control in time and frequency field.In electronic surveying, in the high precision instrument for testing devices such as oscillograph, logic analyser, signal generator, all contain high-resolution phase difference measurements module.The fields such as star ground time synchronized, navigator fix, laser ranging, mechanics of communication in engineer applied also need high-resolution phase difference measurement technology.High-resolution phase difference measurements technology is the core technology ensureing to measure comparison, accurate time transmission, navigator fix equally accurate.Such as, in satellite navigation and location system construction and system cloud gray model are safeguarded, time phase is synchronously a gordian technique and a key property of satellite navigation location, and directly having influence on the precision of whole system, is the key of system.In the technology such as split-second precision Frequency Transfer, synchronous and measurement, all need high-resolution phase difference measurement and treatment technology.
Along with the technical development of the high-tech areas such as communication, Aero-Space, navigator fix, and novel frequency standard, as superelevation stable crystal oscillator, atomic clock, fountain clock, light clock etc. have the frequency source equipment development of high stability, such as, the frequency accuracy of cesium-beam atomic clock can reach 10
-13magnitude, the degree of stability of a day can reach 10
-15magnitude, the precision measurement of frequency and the analysis demand of frequency stability are also improved constantly, need measurement and the control technology of the time and frequency standards of more pin-point accuracy, propose more and more higher requirement to the process resolution of time frequency signal, the effect of high-resolution phase difference measurement and comparison method is more important.Therefore, the further investigation of high-resolution phase difference measurement and comparison new technology has important theory and realistic meaning.
For the frequency signal with same nominal value, the time interval and phase differential have identical meaning in itself, therefore domestic and international existing phase difference measurement technology be all by two homogenous frequency signals between phase differential regard short time interval as to measure.Existing conventional method for measuring phase difference has direct count method, analog interpolation, time figure transformation approach, vernier method, two mixing time difference methods etc.Direct count method structure is simple, measurement range is wide, but there is ± 1 counting error, and measuring accuracy is not high enough.Analog interpolation and time figure transformation approach are all further for the short time interval being less than a count cycle in direct count method high resolving power measured.Analog interpolation adopts capacitor charge and discharge method to improve Measurement Resolution, but Measurement Resolution is subject to the restriction of filling clock frequency, is subject to the interference of noise when measured signal frequency is higher simultaneously.Time figure transformation approach and vernier method delay collimation method improve Measurement Resolution, but Measurement Resolution is subject to the restriction of the resolution of lag line, is generally hundred picosecond magnitudes.Two mixing time difference method utilizes intermediary's crystal oscillator measure phase difference, and resolution can reach picosecond magnitude, but is subject to the impact of intermediary's crystal oscillator, and the method has larger long-term measurement drift, is not suitable for long-time continuous and measures.
Summary of the invention
For Problems existing in above-mentioned existing method for measuring phase difference, such as, direct count method and analog interpolation Measurement Resolution are limited to filling clock frequency, there is ± 1 counting error, in the resolution of lag line, there is delayed quantization error, integrated non-linear, complex circuit in the resolution limitations of time figure transformation approach and vernier method, two mixing time difference method is by the impact of intermediary's crystal oscillator, there is larger long-term measurement drift, be not suitable for long-time continuous measurement etc., the invention provides a kind of method and system with the ultrahigh resolution phase difference measurement detected based on dual conjunction that difference is revised, the method utilizes the quarter-phase between alien frequencies signal to overlap and detects and forms measurement gate, to the method for being carried out count measurement phase differential by measured frequency and public frequency measuring Men Shinei, by counting to the enabling of measurement gate and neighbouring coincidence impulse of closing the door the modified value drawing phase differential, thus realize the phase difference measurement of ultrahigh resolution.
The object of the present invention is to provide a kind of system with the ultrahigh resolution phase difference measurement detected based on dual conjunction that difference is revised, this system comprises:
Tested frequency signal load module;
Reference frequency signal load module;
Be connected with described tested frequency signal load module, for carrying out the first signal shaping module of shaping to tested frequency signal;
Be connected with described reference frequency signal load module, for generation of the Direct Digital Synthesizer of common frequency signals;
Be connected with described Direct Digital Synthesizer, the common frequency signals for producing described Direct Digital Synthesizer carries out the secondary signal Shaping Module of shaping;
Be connected with described reference frequency signal load module, for carrying out the 3rd signal shaping module of shaping to reference frequency signal;
Be connected with described first signal shaping module and secondary signal Shaping Module, the first phase for carrying out Phase coincidence detection and generation coincidence impulse to the tested frequency signal after shaping and common frequency signals overlaps and detects and coincidence impulse generation circuit;
Be connected with described secondary signal Shaping Module and the 3rd signal shaping module, the second phase for carrying out Phase coincidence detection and generation coincidence impulse to the common frequency signals after shaping and reference frequency signal overlaps and detects and coincidence impulse generation circuit;
Overlap with described first phase and to detect and coincidence impulse produces circuit and second phase and overlaps and to detect and coincidence impulse produces circuit and is connected, to detect for described first phase is overlapped and coincidence impulse produces signal that circuit exports and to detect as enabling signal and described second phase being overlapped and coincidence impulse produces signal that circuit exports as pass gate signal, and produce circuit during the door of signal during generator gate;
With produce circuit when described first shaping circuit and door and be connected, signal during for producing door that circuit exports when the tested frequency signal after receiving shaping that described first shaping circuit exports and door, when door signal control under the tested frequency signal after shaping carried out to first and door of conducting and cut-off;
Be connected with door with described first, at measurement Men Shinei, to the first counter that the tested frequency signal sending into described first and door counts;
With produce circuit when described second shaping circuit and door and be connected, signal during for producing door that circuit exports when the common frequency signals after receiving shaping that described second shaping circuit exports and door, when door signal control under the common frequency signals after shaping carried out to second and door of conducting and cut-off;
Be connected with door with described second, at measurement Men Shinei, to the second counter that the common frequency signals sending into described second and door counts;
Overlap with described first phase and to detect and coincidence impulse produces circuit and single-chip microcomputer is connected, for tested frequency signal after receiving shaping and common frequency signals through described first phase overlap detect and coincidence impulse produces coincidence impulse that circuit produces and the reference gate that described single-chip microcomputer exports time signal, when reference gate signal control under to shaping after tested frequency signal and common frequency signals overlap through described first phase and to detect and coincidence impulse produces the 3rd and the door that coincidence impulse that circuit produces carries out conducting and cut-off;
Overlap with described second phase and to detect and coincidence impulse produces circuit and single-chip microcomputer is connected, for receive reference frequency signal and common frequency signals after shaping through described second phase overlap detect and coincidence impulse produces coincidence impulse that circuit produces and the reference gate that described single-chip microcomputer exports time signal, when reference gate signal control under to shaping after reference frequency signal and common frequency signals overlap through described second phase and to detect and coincidence impulse produces the 4th and the door that coincidence impulse that circuit produces carries out conducting and cut-off;
Be connected with door with described first, at measurement Men Shinei, to the first counter that the tested frequency signal of input first and door counts;
Be connected with door with described second, at measurement Men Shinei, to the second counter that the common frequency signals of input second and door counts;
Be connected with door with the described 3rd, for interior when reference gate, to input the 3rd and door and overlapped by described first phase and to detect and coincidence impulse produces the 3rd counter that coincidence impulse that circuit produces counts;
Be connected with door with the described 4th, for interior when reference gate, to input the 4th and door and overlapped by described second phase and to detect and coincidence impulse produces the four-counter that coincidence impulse that circuit produces counts;
Be connected with described first counter, the second counter, the 3rd counter and four-counter, for receiving the data that described first counter, the second counter, the 3rd counter and four-counter export, data are processed, and obtains the single-chip microcomputer of tested frequency signal and reference frequency signal phase differential.
Further, this system is also provided with:
With produce circuit during described door and be connected, for producing the delay control circuit that circuit carries out appropriate time delay during opposite house.
Another object of the present invention is to provide a kind of method of the ultrahigh resolution phase difference measurement detected based on dual conjunction having that difference revises, the method comprises the following steps:
Be f by reference frequency
0signal produce public frequency be f
csignal, will be f by measured frequency
xsignal and public frequency be f
csignal be input to first phase and overlap and to detect and coincidence impulse produces circuit, phase coincidence point is as measurement gate enabling signal;
Be f with reference to frequency
0signal and public frequency be f
csignal input second phase overlap detect and coincidence impulse produce circuit, phase coincidence point as measurement gate close gate signal;
At measurement Men Shinei respectively to being f by measured frequency
xsignal and public frequency be f
csignal-count, meanwhile, to being f by measured frequency
xsignal and public frequency be f
csignal and reference frequency be f
0signal and public frequency be f
cthe phase coincidence pulse of signal count respectively, by all count value input single-chip microcomputers, trying to achieve by measured frequency is f
xsignal and reference frequency be f
0the phase differential of signal.
Further, reference frequency is f
0signal be f by measured frequency
xsignal with frequently, there is the identical cycle, but there is certain phase differential.
Further, the specific implementation step of the method is:
Reference frequency is f
0signal be f by measured frequency
xsignal with frequently, there is identical cycle T
0, but there is certain phase differential;
Reference frequency is f
0signal be f as producing public frequency with reference to clock control Direct Digital Synthesizer
csignal, require f
c>f
0, the cycle is designated as T
c;
To be f by measured frequency
xsignal and public frequency be f
csignal shaping after send into first phase overlap detect and coincidence impulse produce circuit, be f with reference to frequency
0signal and public frequency be f
csignal shaping after send into second phase overlap detect and coincidence impulse produce circuit;
First phase overlaps and to detect and coincidence impulse produces the output of circuit and is divided into two-way, and produce circuit when a road is delivered to, as the enabling signal producing circuit during door, the 3rd and door are delivered in another road;
Second phase overlaps and to detect and coincidence impulse produces the output of circuit and is divided into two-way, and produce circuit when a road is delivered to, as the pass gate signal producing circuit during door, the 4th and door are delivered in another road;
Produce during door the output of circuit deliver to respectively first with door and second and door, control first with door and second and the opening and closedown of door;
First counter and the second counter respectively to feeding first and door and second and door be f by measured frequency
xsignal and public frequency be f
csignal measurement Men Shinei count, count value is N
xand N
c;
When single-chip microcomputer produces reference gate in order to control the 3rd with door and the 4th with the opening and closing of door, the 3rd counter and four-counter are respectively to feeding the 3rd and door and the 4th and the coincidence impulse of door is interior when reference gate counts, and count value is N
3and N
4;
By all count value N
x, N
c, N
3and N
4send into single-chip microcomputer, single-chip microcomputer carries out data processing, obtains final phase differential.
The method and system with the ultrahigh resolution phase difference measurement detected based on dual conjunction that difference is revised provided by the invention, first signal shaping module carries out shaping to tested frequency signal, Direct Digital Synthesizer produces common frequency signals according to the reference frequency signal of input, secondary signal Shaping Module carries out shaping to common frequency signals, 3rd signal shaping module carries out shaping to reference frequency signal, first phase coincidence detects and coincidence impulse generation circuit carries out Phase coincidence detection to the tested frequency signal after shaping and common frequency signals and produces coincidence impulse, second phase coincidence detects and coincidence impulse generation circuit carries out Phase coincidence detection to the common frequency signals after shaping and reference frequency signal and produces coincidence impulse, door time produce circuit using first phase overlap detect and coincidence impulse produce circuit export signal as enabling signal and using second phase overlap detect and coincidence impulse produce circuit export signal as pass gate signal, and signal during generator gate, first counter counts at the tested frequency signal measuring Men Shinei feeding first and door, second counter counts at the common frequency signals measuring Men Shinei feeding second and door, the coincidence impulse of 3rd counter to the interior feeding the 3rd when reference gate and door counts, the coincidence impulse of four-counter to the interior feeding the 4th when reference gate and door counts, single-chip microcomputer processes enumeration data, and obtain tested frequency signal and reference frequency signal phase differential, utilize the quarter-phase between two alien frequencies signals to overlap and detect and form measurement gate, count measurement phase differential is carried out to the tested frequency signal and common frequency signals of measuring Men Shinei, by drawing the modified value of phase differential to the method that measurement gate opens the door and neighbouring coincidence impulse of closing the door counts, achieve the phase difference measurement of ultrahigh resolution, eliminate counting error, Measurement Resolution is far superior to existing filling clock resolution and delay resolution, long term drift amount is little, realizing circuit structure is simple, be easy to integrated and commercialization, practical, there is stronger propagation and employment be worth.
Accompanying drawing explanation
Fig. 1 is the structured flowchart with the ultrahigh resolution phase Difference Measuring System detected based on dual conjunction that difference is revised that the embodiment of the present invention provides.
In figure: 1, tested frequency signal load module; 2, the first signal shaping module; 3, reference frequency signal load module; 4, Direct Digital Synthesizer; 5, secondary signal Shaping Module; 6, the 3rd signal shaping module; 7, first phase overlaps and detects and coincidence impulse generation circuit; 8, second phase overlaps and detects and coincidence impulse generation circuit; 9, circuit is produced during door; 10, first and door; 11, the first counter; 12, the 3rd and door; 13, the 3rd counter; 14, the 4th and door; 15, four-counter; 16, second and door; 17, the second counter; 18, single-chip microcomputer; 19, delay control circuit.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and be not used in restriction invention.
The structure of the ultrahigh resolution phase Difference Measuring System detected based on dual conjunction that difference that what Fig. 1 showed that the embodiment of the present invention provides have is revised.For convenience of explanation, illustrate only part related to the present invention.
This system comprises:
Tested frequency signal load module 1;
Reference frequency signal load module 3;
Be connected with tested frequency signal load module 1, for carrying out the first signal shaping module 2 of shaping to tested frequency signal;
Be connected with reference frequency signal load module 3, for generation of the Direct Digital Synthesizer 4 of common frequency signals;
Be connected with Direct Digital Synthesizer 4, the common frequency signals for producing Direct Digital Synthesizer 4 carries out the secondary signal Shaping Module 5 of shaping;
Be connected with reference frequency signal load module 3, carry out the 3rd signal shaping module 6 of shaping for reference frequency signal;
Be connected with the first signal shaping module 2 and secondary signal Shaping Module 5, the first phase for carrying out Phase coincidence detection and generation coincidence impulse to the tested frequency signal after shaping and common frequency signals overlaps and detects and coincidence impulse generation circuit 7;
Be connected with secondary signal Shaping Module 5 and the 3rd signal shaping module 6, the second phase for carrying out Phase coincidence detection and generation coincidence impulse to the common frequency signals after shaping and reference frequency signal overlaps and detects and coincidence impulse generation circuit 8;
Overlap with first phase and to detect and coincidence impulse produces circuit 7 and second phase and overlaps and to detect and coincidence impulse produces circuit 8 and is connected, to detect for first phase is overlapped and coincidence impulse produces the signal that exports of circuit 7 and to detect as enabling signal and second phase being overlapped and coincidence impulse produces signal that circuit 8 exports as pass gate signal, and produce circuit 9 during the door of signal during generator gate;
With produce circuit 9 when the first shaping circuit and door and be connected, signal during for producing door that circuit 9 exports when the tested frequency signal after receiving shaping that the first shaping circuit exports and door, when door signal control under the tested frequency signal after shaping carried out to first and the door 10 of conducting and cut-off;
Be connected with door 10 with first, at measurement Men Shinei, to the first counter 11 that the tested frequency signal of feeding first and door 10 counts;
With produce circuit 9 when the second shaping circuit and door and be connected, signal during for producing door that circuit 9 exports when the common frequency signals after receiving shaping that the second shaping circuit exports and door, when door signal control under the common frequency signals after shaping carried out to second and the door 16 of conducting and cut-off;
Be connected with door 16 with second, at measurement Men Shinei, to the second counter 17 that the common frequency signals of feeding second and door 16 counts;
Overlap with first phase and to detect and coincidence impulse produces circuit 7 and single-chip microcomputer 18 is connected, for tested frequency signal after receiving shaping and common frequency signals through first phase overlap detect and coincidence impulse produces coincidence impulse that circuit 7 produces and the reference gate that single-chip microcomputer 18 exports time signal, when reference gate signal control under to shaping after tested frequency signal and common frequency signals overlap through first phase and to detect and coincidence impulse produces the 3rd and the door 12 that coincidence impulse that circuit 7 produces carries out conducting and cut-off;
Overlap with second phase and to detect and coincidence impulse produces circuit 8 and single-chip microcomputer 18 is connected, for receive reference frequency signal and common frequency signals after shaping through second phase overlap detect and coincidence impulse produces coincidence impulse that circuit 8 produces and the reference gate that single-chip microcomputer 18 exports time signal, when reference gate signal control under to shaping after reference frequency signal and common frequency signals overlap through second phase and to detect and coincidence impulse produces the 4th and the door 14 that coincidence impulse that circuit 8 produces carries out conducting and cut-off;
Be connected with door 10 with first, at measurement Men Shinei, to the first counter 11 that the tested frequency signal of input first and door 10 counts;
Be connected with door 16 with second, at measurement Men Shinei, to the second counter 17 that the common frequency signals of input second and door 16 counts;
Be connected with door 12 with the 3rd, for interior when reference gate, to input the 3rd and door 12 and overlapped by first phase and to detect and coincidence impulse produces the 3rd counter 13 that coincidence impulse that circuit 7 produces counts;
Be connected with door 14 with the 4th, for interior when reference gate, to input the 4th and door 14 and overlapped by second phase and to detect and coincidence impulse produces the four-counter 15 that coincidence impulse that circuit 8 produces counts;
Be connected with the first counter 11, second counter 17, the 3rd counter 13 and four-counter 15, for receiving the data that the first counter 11, second counter 17, the 3rd counter 13 and four-counter 15 export, data are processed, and obtains the single-chip microcomputer 18 of tested frequency signal and reference frequency signal phase differential.
In embodiments of the present invention, this system is also provided with:
With produce circuit 9 during door and be connected, for producing the delay control circuit 19 that circuit 9 carries out appropriate time delay during opposite house.
Another object of the present invention is to provide a kind of method of the ultrahigh resolution phase difference measurement detected based on dual conjunction having that difference revises, the method comprises the following steps:
Be f by reference frequency
0signal produce public frequency be f
csignal, will be f by measured frequency
xsignal and public frequency be f
csignal be input to first phase and overlap and to detect and coincidence impulse produces circuit 7, phase coincidence point is as measurement gate enabling signal;
Be f with reference to frequency
0signal and public frequency be f
csignal input second phase overlap detect and coincidence impulse produce circuit 8, phase coincidence point as measurement gate close gate signal;
At measurement Men Shinei respectively to being f by measured frequency
xsignal and public frequency be f
csignal-count, meanwhile, to being f by measured frequency
xsignal and public frequency be f
csignal and reference frequency be f
0signal and public frequency be f
cthe phase coincidence pulse of signal count respectively, by all count value input single-chip microcomputers 18, trying to achieve by measured frequency is f
xsignal and reference frequency be f
0the phase differential of signal.
In embodiments of the present invention, reference frequency is f
0signal be f by measured frequency
xsignal with frequently, there is the identical cycle, but there is certain phase differential.
In embodiments of the present invention, the specific implementation step of the method is:
Reference frequency is f
0signal be f by measured frequency
xsignal with frequently, there is identical cycle T
0, but there is certain phase differential;
Reference frequency is f
0signal be f as producing public frequency with reference to clock control Direct Digital Synthesizer 4
csignal, require f
c>f
0, the cycle is designated as T
c;
To be f by measured frequency
xsignal and public frequency be f
csignal shaping after send into first phase overlap detect and coincidence impulse produce circuit 7, be f with reference to frequency
0signal and public frequency be f
csignal shaping after send into second phase overlap detect and coincidence impulse produce circuit 8;
First phase overlaps and to detect and coincidence impulse produces the output of circuit 7 and is divided into two-way, produces circuit 9 when a road is delivered to, as the enabling signal producing circuit 9 during door, another road deliver to the 3rd with door 12;
Second phase overlaps and to detect and coincidence impulse produces the output of circuit 8 and is divided into two-way, produces circuit 9 when a road is delivered to, as the pass gate signal producing circuit 9 during door, another road deliver to the 4th with door 14;
Produce during door the output of circuit 9 deliver to respectively first with door 10 and second with door 16, control first and door 10 and second and the opening and closedown of door 16;
First counter 11 and the second counter 17 respectively to feeding first and door 10 and second and door 16 be f by measured frequency
xsignal and public frequency be f
csignal measurement Men Shinei count, count value is N
xand N
c;
When single-chip microcomputer 18 produces reference gate in order to control the 3rd with door 12 and the 4th with the opening and closing of door 14,3rd counter 13 and four-counter 15 are respectively to feeding the 3rd and door 12 and the 4th and the coincidence impulse of door 14 is interior when reference gate counts, and count value is N
3and N
4;
By all count value N
x, N
c, N
3and N
4send into single-chip microcomputer 18, single-chip microcomputer 18 carries out data processing, obtains final phase differential.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
The present invention is directed to the shortcomings such as counting in phase difference measurement technology and quantization error and long term drift be large, propose a kind of quarter-phase coincidence detection formation measurement gate utilized between alien frequencies signal, to the method for being carried out count measurement phase differential by measured frequency and public frequency measuring Men Shinei, by counting to the enabling of measurement gate and neighbouring coincidence impulse of closing the door the modified value drawing phase differential, thus realize the phase difference measurement of ultrahigh resolution.
Technical matters to be solved by this invention is the deficiency for existing in existing phase difference measurement technology, provide a kind of method and system with the ultrahigh resolution phase difference measurement detected based on dual conjunction that difference is revised, specific works principle is: two comparison signal f with same frequency
0and f
x, wherein f
0for reference frequency, f
xfor by measured frequency, f
xand f
0there is certain phase differential, two signals have the identical cycle, are designated as T
0.F
0public frequency f is produced as with reference to clock control Direct Digital Synthesizer 4
c, require f
c>f
0, its cycle is designated as T
c.By f
xand f
csend into first phase coincidence after shaping to detect and coincidence impulse generation circuit 7, by f
0and f
csend into second phase coincidence after shaping to detect and coincidence impulse generation circuit 8.First phase overlaps and to detect and coincidence impulse produces the output of circuit 7 and is divided into two-way, produces circuit 9 when a road is delivered to, as the enabling signal producing circuit 9 during door, another road deliver to the 3rd with door 12; Second phase overlaps and to detect and coincidence impulse produces the output of circuit 8 and is divided into two-way, produces circuit 9 when a road is delivered to, as the pass gate signal producing circuit 9 during door, another road deliver to the 4th with door 14; Delay control circuit 19 carries out reasonable time delay for producing circuit 9 during opposite house; Produce during door the output of circuit 9 deliver to respectively first with door 10 and second with door 16, be used for control first and door 10 and second and the opening and closedown of door 16; First counter 11 and the second counter 17 are used for respectively to feeding first and door 10 and second and the f of door 16
xand f
ccount at measurement Men Shinei, count value is N
xand N
c; When single-chip microcomputer 18 produces reference gate in order to control the 3rd with door 12 and the 4th with the opening and closing of door 14,3rd counter 13 and four-counter 15 are used for respectively to feeding the 3rd and door 12 and the 4th and the coincidence impulse of door 14 is interior when reference gate counts, and count value is N
3and N
4; By all count value N
x, N
c, N
3and N
4send into single-chip microcomputer 18, single-chip microcomputer 18 carries out data processing, obtains final phase differential.
High-accuracy time phase, simultaneous techniques had important effect in the high-tech areas such as communication, Aero-Space, navigator fix, the phase difference measurement technology of ultrahigh resolution is the core of simultaneous techniques high-accuracy time phase, and between comparison signal, the accuracy of phase difference measurement decides the precision of synchronous and related application time phase to a great extent.
This has the method and system of the ultrahigh resolution phase difference measurement detected based on dual conjunction that difference is revised, what adopt from principle is the synchronous and Quantization phase stepping principle of phase group and group's phase coincidence principle between alien frequencies signal, namely the phase relation between two alien frequencies signals always never overlaps and is transitioned into coincidence gradually, be transitioned into the process do not overlapped again, and the phase difference value of two alien frequencies signals is that step value changes with Quantization phase between two adjacent phase coincidence points, so just the phase differential between two alien frequencies signals is carried out discretize between two phase place coincide point, reduce measurement difficulty, eliminate counting and quantization error, meanwhile, by the difference to phase coincidence step-by-step counting near two phase place coincide point, final phase differential is revised, improves Measurement Resolution, owing to not adopting analog device, long-term measurement drift is less.
The phase difference measurement that the inventive method realizes can arrive the Measurement Resolution being better than psec.The frequency difference of the method between public frequency and two comparison signals (by measured frequency and reference frequency) is less, resolution is higher, even if for the larger situation of frequency difference, also can obtain Measurement Resolution more better than existing method for measuring phase difference.
The method and system of the ultrahigh resolution phase difference measurement detected based on dual conjunction that difference that what the embodiment of the present invention provided have is revised, first signal shaping module 2 carries out shaping to tested frequency signal, Direct Digital Synthesizer 4 produces common frequency signals according to the reference frequency signal of input, secondary signal Shaping Module 5 pairs of common frequency signals carry out shaping, 3rd signal shaping module 6 pairs reference frequency signal carries out shaping, tested frequency signal after first phase coincidence detection and coincidence impulse produce circuit 7 pairs of shapings and common frequency signals carry out Phase coincidence detection and produce coincidence impulse, common frequency signals after second phase coincidence detection and coincidence impulse produce circuit 8 pairs of shapings and reference frequency signal carry out Phase coincidence detection and produce coincidence impulse, produce circuit 9 during door first phase is overlapped to detect and coincidence impulse produces the signal that exports of circuit 7 and to detect as enabling signal and second phase being overlapped and coincidence impulse produces signal that circuit 8 exports as pass gate signal, and signal during generator gate, first counter 11 counts at the tested frequency signal measuring Men Shinei feeding first and door 10, second counter 17 counts at the common frequency signals measuring Men Shinei feeding second and door 16, the coincidence impulse of 3rd counter 13 to the interior feeding the 3rd when reference gate and door 12 counts, the coincidence impulse of four-counter 15 to the interior feeding the 4th when reference gate and door 14 counts, single-chip microcomputer 18 pairs of enumeration datas process, and obtain tested frequency signal and reference frequency signal phase differential, utilize the quarter-phase between two alien frequencies signals to overlap and detect and form measurement gate, count measurement phase differential is carried out to the tested frequency signal and common frequency signals of measuring Men Shinei, by drawing the modified value of phase differential to the method that measurement gate opens the door and neighbouring coincidence impulse of closing the door counts, achieve the phase difference measurement of ultrahigh resolution, eliminate counting error, Measurement Resolution is far superior to existing filling clock resolution and delay resolution, long term drift amount is little, realizing circuit structure is simple, be easy to integrated and commercialization, practical, there is stronger propagation and employment be worth.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. have a system for the ultrahigh resolution phase difference measurement detected based on dual conjunction that difference is revised, it is characterized in that, this system comprises:
Tested frequency signal load module;
Reference frequency signal load module;
Be connected with described tested frequency signal load module, for carrying out the first signal shaping module of shaping to tested frequency signal;
Be connected with described reference frequency signal load module, for generation of the Direct Digital Synthesizer of common frequency signals;
Be connected with described Direct Digital Synthesizer, the common frequency signals for producing described Direct Digital Synthesizer carries out the secondary signal Shaping Module of shaping;
Be connected with described reference frequency signal load module, for carrying out the 3rd signal shaping module of shaping to reference frequency signal;
Be connected with described first signal shaping module and secondary signal Shaping Module, the first phase for carrying out Phase coincidence detection and generation coincidence impulse to the tested frequency signal after shaping and common frequency signals overlaps and detects and coincidence impulse generation circuit;
Be connected with described secondary signal Shaping Module and the 3rd signal shaping module, the second phase for carrying out Phase coincidence detection and generation coincidence impulse to the common frequency signals after shaping and reference frequency signal overlaps and detects and coincidence impulse generation circuit;
Overlap with described first phase and to detect and coincidence impulse produces circuit, second phase overlaps detects and coincidence impulse produces circuit and is connected, to detect for described first phase is overlapped and coincidence impulse produces signal that circuit exports and to detect as enabling signal and described second phase being overlapped and coincidence impulse produces signal that circuit exports as pass gate signal, and produce circuit during the door of signal during generator gate;
With produce circuit when described first signal shaping module, door and be connected, signal during for producing the door that circuit exports when the tested frequency signal after receiving shaping that the first signal shaping module exports and door, when door signal control under the tested frequency signal after shaping carried out to first and door of conducting and cut-off;
Be connected with door with described first, at measurement Men Shinei, to the first counter that the tested frequency signal sending into described first and door counts;
With produce circuit when described secondary signal Shaping Module, door and be connected, signal during for producing the door that circuit exports when the common frequency signals after receiving shaping that secondary signal Shaping Module exports and door, when door signal control under the common frequency signals after shaping carried out to second and door of conducting and cut-off;
Be connected with door with described second, at measurement Men Shinei, to the second counter that the common frequency signals sending into described second and door counts;
Overlap with described first phase and to detect and coincidence impulse produces circuit, single-chip microcomputer is connected, for tested frequency signal after receiving shaping and common frequency signals through described first phase overlap detect and coincidence impulse produces coincidence impulse that circuit produces and the reference gate that described single-chip microcomputer exports time signal, when reference gate signal control under to shaping after tested frequency signal and common frequency signals overlap through described first phase and to detect and coincidence impulse produces the 3rd and the door that coincidence impulse that circuit produces carries out conducting and cut-off;
Be connected with door with the described 3rd, for interior when reference gate, to input the 3rd and door and overlapped by described first phase and to detect and coincidence impulse produces the 3rd counter that coincidence impulse that circuit produces counts;
Overlap with described second phase and to detect and coincidence impulse produces circuit, single-chip microcomputer is connected, for receive reference frequency signal and common frequency signals after shaping through described second phase overlap detect and coincidence impulse produces coincidence impulse that circuit produces and the reference gate that described single-chip microcomputer exports time signal, when reference gate signal control under to shaping after reference frequency signal and common frequency signals overlap through described second phase and to detect and coincidence impulse produces the 4th and the door that coincidence impulse that circuit produces carries out conducting and cut-off;
Be connected with door with the described 4th, for interior when reference gate, to input the 4th and door and overlapped by described second phase and to detect and coincidence impulse produces the four-counter that coincidence impulse that circuit produces counts;
Be connected with described first counter, the second counter, the 3rd counter and four-counter, for receiving the data that described first counter, the second counter, the 3rd counter and four-counter export, data are processed, and obtains the single-chip microcomputer of tested frequency signal and reference frequency signal phase differential.
2. have the system of the ultrahigh resolution phase difference measurement detected based on dual conjunction that difference is revised as claimed in claim 1, it is characterized in that, this system is also provided with:
With produce circuit during described door and be connected, for producing the delay control circuit that circuit carries out appropriate time delay during opposite house.
3. have a method for the ultrahigh resolution phase difference measurement detected based on dual conjunction that difference is revised, it is characterized in that, the method comprises the following steps:
Be f by reference frequency
0signal produce public frequency be f
csignal, will be f by measured frequency
xsignal and public frequency be f
csignal be input to first phase and overlap and to detect and coincidence impulse produces circuit, phase coincidence point is as measurement gate enabling signal;
Be f with reference to frequency
0signal and public frequency be f
csignal input second phase overlap detect and coincidence impulse produce circuit, phase coincidence point as measurement gate close gate signal;
At measurement Men Shinei respectively to being f by measured frequency
xsignal and public frequency be f
csignal-count, meanwhile, to being f by measured frequency
xsignal and public frequency be f
csignal and reference frequency be f
0signal and public frequency be f
cthe phase coincidence pulse of signal count respectively, by all count value input single-chip microcomputers, trying to achieve by measured frequency is f
xsignal and reference frequency be f
0the phase differential of signal;
Reference frequency is f
0signal be f by measured frequency
xsignal with frequently, there is the identical cycle, but there is certain phase differential;
The specific implementation step of the method is:
Reference frequency is f
0signal be f by measured frequency
xsignal with frequently, there is identical cycle T
0, but there is certain phase differential;
Reference frequency is f
0signal be f as producing public frequency with reference to clock control Direct Digital Synthesizer
csignal, require f
c>f
0, the cycle is designated as T
c;
To be f by measured frequency
xsignal and public frequency be f
csignal shaping after send into first phase overlap detect and coincidence impulse produce circuit, be f with reference to frequency
0signal and public frequency be f
csignal shaping after send into second phase overlap detect and coincidence impulse produce circuit;
First phase overlaps and to detect and coincidence impulse produces the output of circuit and is divided into two-way, and produce circuit when a road is delivered to, as the enabling signal producing circuit during door, the 3rd and door are delivered in another road;
Second phase overlaps and to detect and coincidence impulse produces the output of circuit and is divided into two-way, and produce circuit when a road is delivered to, as the pass gate signal producing circuit during door, the 4th and door are delivered in another road;
Produce during door the output of circuit deliver to respectively first with door and second and door, control first with door and second and the opening and closedown of door;
First counter and the second counter respectively to feeding first and door and second and door be f by measured frequency
xsignal and public frequency be f
csignal measurement Men Shinei count, count value is N
xand N
c;
When single-chip microcomputer produces reference gate in order to control the 3rd with door and the 4th with the opening and closing of door, the 3rd counter and four-counter are respectively to feeding the 3rd and door and the 4th and the coincidence impulse of door is interior when reference gate counts, and count value is N
3and N
4;
By all count value N
x, N
c, N
3and N
4send into single-chip microcomputer, single-chip microcomputer carries out data processing, obtains final phase differential.
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| CN201310066563.6A CN103197145B (en) | 2013-03-02 | 2013-03-02 | Method and system of ultrahigh resolution phase difference measurement |
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| CN103197145B true CN103197145B (en) | 2015-03-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103760416B (en) * | 2013-12-23 | 2016-05-18 | 中国科学院等离子体物理研究所 | A kind of directional coupler is measured the error analysis method of High-Power Microwave phase place |
| CN105067896B (en) * | 2015-08-10 | 2017-08-15 | 郑州轻工业学院 | A kind of alien frequencies phase coincidence confusion region characteristic pulse detecting system and detection method |
| CN105162460B (en) * | 2015-08-10 | 2017-10-31 | 郑州轻工业学院 | A kind of high-precision alien frequencies group quantization phase-locked system |
| CN106645952B (en) * | 2016-10-18 | 2019-06-25 | 上海华虹计通智能系统股份有限公司 | A kind of detection method and system of signal phase difference |
| CN108089160B (en) * | 2017-12-08 | 2020-01-17 | 郑州轻工业学院 | High-precision bistatic radar time synchronization detection system and detection method |
| US10067478B1 (en) | 2017-12-11 | 2018-09-04 | Silicon Laboratories Inc. | Use of a recirculating delay line with a time-to-digital converter |
| CN110082593A (en) * | 2018-01-25 | 2019-08-02 | 深圳市英特瑞半导体科技有限公司 | A kind of Method for Phase Difference Measurement and phase measurement device |
| CN109030939B (en) * | 2018-06-01 | 2020-08-28 | 中国人民解放军陆军工程大学石家庄校区 | Multichannel synchronous frequency measurement device |
| CN109001675B (en) * | 2018-08-03 | 2022-06-03 | 电子科技大学 | Positioning method for measuring distance difference based on phase difference |
| CN113093517B (en) * | 2021-04-12 | 2022-04-08 | 湖南师范大学 | Precise short-time interval measurement system and measurement method based on Beidou clock |
| CN113376999B (en) * | 2021-06-08 | 2023-01-06 | 西安电子科技大学 | Special adder for high time resolution time-to-digital converter |
| CN113933867B (en) * | 2021-10-12 | 2023-12-01 | 湖南师范大学 | High-resolution phase synchronization system and synchronization method based on Beidou clock signal |
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| CN102508024A (en) * | 2011-09-20 | 2012-06-20 | 郑州轻工业学院 | Frequency and phase difference precision measurement method based on frequency and phase relationship auxiliary processing |
| CN102735936A (en) * | 2011-12-06 | 2012-10-17 | 郑州轻工业学院 | Ultrahigh resolution phase synchronization detection method based on medium source vernier method |
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