CN103197145A - 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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- CN103197145A CN103197145A CN2013100665636A CN201310066563A CN103197145A CN 103197145 A CN103197145 A CN 103197145A CN 2013100665636 A CN2013100665636 A CN 2013100665636A CN 201310066563 A CN201310066563 A CN 201310066563A CN 103197145 A CN103197145 A CN 103197145A
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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 the frequency time signal processing technology field, relate in particular to a kind of have the correction of differing based on dual method and system of closing the ultrahigh resolution phase difference measurement of detection.
Background technology
High-resolution phase difference measurements technology all has in scientific research and engineering practice widely to be used, and is bringing into play important effect at the time-frequency measurement and control area.In electronic surveying, all comprised high-resolution phase difference measurements module in the high precision measurement instruments such as oscillograph, logic analyser, signal generator.Fields such as the star ground time synchronized during engineering is used, navigator fix, laser ranging, mechanics of communication also need high-resolution phase difference measurement technology.High-resolution phase difference measurements technology is the core technology that guarantees to measure precision such as comparison, accurate time transmission, navigator fix.For example, in satellite navigation and location system construction and system's operation maintenance, be a gordian technique and key property of satellite navigation location time phase synchronously, directly has influence on the precision of total system, is the key of system's design.In the split-second precision Frequency Transfer, synchronously and in the technology such as measurement, all needing has high-resolution phase difference measurement and treatment technology.
Technical development along with high-tech areas such as communication, Aero-Space, navigator fixs, and novel frequency standard, the frequency source equipment that has high stability as superelevation stable crystal oscillator, atomic clock, fountain clock, light clock etc. constantly develops, and for example, the frequency accuracy of cesium-beam atomic clock can reach 10
-13Magnitude, one day degree of stability can reach 10
-15Magnitude, the precision measurement of frequency and the analysis demand of frequency stability are also improved constantly, need more measurement and the control technology of the time and frequency standards of pin-point accuracy, processing resolution to time frequency signal has proposed more and more higher requirement, and 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 has identical meaning with phase differential in itself, and therefore domestic and international existing phase difference measurement technology all is to regard the phase differential between two homogenous frequency signals as short time interval to measure.Existing method for measuring phase difference commonly used has direct count method, analog interpolation, time figure transformation approach, vernier method, two mixing time difference methods etc.Direct count method is simple in structure, measurement range is wide, but has ± 1 counting error, and measuring accuracy is not high enough.Analog interpolation and time figure transformation approach all are that the further high resolving power of the short time interval less than a count cycle in the direct count method is measured.Analog interpolation adopts the capacitor charge and discharge method to improve Measurement Resolution, but Measurement Resolution is subjected to filling the restriction of clock frequency, is subject to interference of noise simultaneously under measured signal frequency condition with higher.Time figure transformation approach and vernier method have improved Measurement Resolution with the delay collimation method, but Measurement Resolution is subjected to the restriction of the resolution of lag line, are generally hundred picosecond magnitudes.Two mixing time difference methods utilize intermediary's crystal oscillator measure phase difference, and resolution can reach picosecond magnitude, but are subjected to the influence of intermediary's crystal oscillator, and this method has bigger long-term measurement drift, is not suitable for long-time continuous and measures.
Summary of the invention
At the problem that exists in the above-mentioned existing method for measuring phase difference, for example, direct count method and analog interpolation Measurement Resolution are subject to the filling clock frequency, have ± 1 counting error; The resolution of time figure transformation approach and vernier method is subject to the resolution of lag line, has delayed quantization error, integrated non-linear, complex circuit; Two mixing time difference methods are subjected to the influence of intermediary's crystal oscillator, there is bigger long-term measurement drift, be not suitable for long-time continuous measurement etc., the invention provides a kind of have the correction of differing based on dual method and system of closing the ultrahigh resolution phase difference measurement of detection, this method is utilized the quarter-phase between the alien frequencies signal to overlap and is detected and constitutes the measurement gate, to measuring the method for being carried out the count measurement phase differential by measured frequency and public frequency of Men Shinei, count the modified value that draws phase differential by near the coincidence impulse the measurement gate is opened the door and closes the door, thereby realize the phase difference measurement of ultrahigh resolution.
The object of the present invention is to provide a kind of have the correction of differing based on dual system of closing the ultrahigh resolution phase difference measurement of detection, this system comprises:
Tested frequency signal load module;
The reference frequency signal load module;
Be connected with described tested frequency signal load module, be used for the first signal shaping module that tested frequency signal is carried out shaping;
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, be used for the secondary signal Shaping Module that the common frequency signals that described Direct Digital Synthesizer produces is carried out shaping;
Be connected with described reference frequency signal load module, be used for the 3rd signal shaping module that reference frequency signal is carried out shaping;
Be connected with the described first signal shaping module and secondary signal Shaping Module, be used for the tested frequency signal after the shaping and common frequency signals are carried out the detection of first phase coincidence and the coincidence impulse generation circuit that phase coincidence detected and produced coincidence impulse;
Be connected with described secondary signal Shaping Module and the 3rd signal shaping module, be used for the common frequency signals after the shaping and reference frequency signal are carried out the detection of second phase coincidence and the coincidence impulse generation circuit that phase coincidence detected and produced coincidence impulse;
Producing circuit and the detection of second phase coincidence and coincidence impulse generation circuit with described first phase coincidence detection and coincidence impulse is connected, be used for will described first phase coincidence detect and signal that coincidence impulse produces circuit output as enabling signal and will described second phase coincidence detect and signal that coincidence impulse produces circuit output as closing gate signal, and during generator gate signal the time generation circuit;
Producing circuit during with described first shaping circuit and door is connected, signal when producing the door of circuit output when be used for receiving tested frequency signal after the shaping of described first shaping circuit output and door, when door under the control of signal to the tested frequency signal after the shaping carry out conducting with end first with door;
Be connected with door with described first, be used for measuring Men Shinei, to sending into described first first counter of counting with the tested frequency signal of door;
Producing circuit during with described second shaping circuit and door is connected, signal when producing the door of circuit output when be used for receiving common frequency signals after the shaping of described second shaping circuit output and door, when door under the control of signal to the common frequency signals after the shaping carry out conducting with end second with door;
Be connected with door with described second, be used for measuring Men Shinei, to sending into described second second counter of counting with the common frequency signals of door;
Detect with described first phase coincidence and coincidence impulse produces circuit and single-chip microcomputer is connected, be used for to receive tested frequency signal and common frequency signals after the shaping and detect and coincidence impulse signal when producing the reference gate of coincidence impulse that circuit produces and the output of described single-chip microcomputer through described first phase coincidence, when reference gate under the control of signal to shaping after tested frequency signal and common frequency signals through described first phase coincidence detect and coincidence impulse produce coincidence impulse that circuit produces carry out conducting with end the 3rd with door;
Detect with described second phase coincidence and coincidence impulse produces circuit and single-chip microcomputer is connected, be used for to receive reference frequency signal and common frequency signals after the shaping and detect and coincidence impulse signal when producing the reference gate of coincidence impulse that circuit produces and the output of described single-chip microcomputer through described second phase coincidence, when reference gate under the control of signal to shaping after reference frequency signal and common frequency signals through described second phase coincidence detect and coincidence impulse produce coincidence impulse that circuit produces carry out conducting with end the 4th with door;
Be connected with door with described first, be used for measuring Men Shinei, to importing first first counter of counting with the tested frequency signal of door;
Be connected with door with described second, be used for measuring Men Shinei, to importing second second counter of counting with the common frequency signals of door;
Be connected with door with the described the 3rd, be used in when the reference gate, to import the 3rd with door and detected and coincidence impulse produces the 3rd counter that coincidence impulse that circuit produces is counted by described first phase coincidence;
Be connected with door with the described the 4th, be used in when the reference gate, to import the 4th with door and detected and coincidence impulse produces the four-counter that coincidence impulse that circuit produces is counted by described second phase coincidence;
Be connected with described first counter, second counter, the 3rd counter and four-counter, be used for receiving the data of described first counter, second counter, the 3rd counter and four-counter output, data are handled, and obtained the single-chip microcomputer of tested frequency signal and reference frequency signal phase differential.
Further, this system also is provided with:
Produce circuit during with described door and be connected, produce circuit when being used for opposite house and carry out the delay control circuit that appropriate time postpones.
Another object of the present invention is to provide a kind of have the correction of differing based on dual method of closing the ultrahigh resolution phase difference measurement of detection, this method may further comprise the steps:
Be f by reference frequency
0Signal to produce public frequency be f
cSignal, will be f by measured frequency
xSignal and public frequency be f
cSignal be input to that first phase coincidence detects and coincidence impulse produces circuit, phase coincidence point is as measurement gate enabling signal;
Be f with reference frequency
0Signal and public frequency be f
cSignal import that second phase coincidence detects and coincidence impulse produces circuit, phase coincidence point is as measuring gate pass gate signal;
Measuring Men Shinei respectively to being f by measured frequency
xSignal and public frequency be f
cSignal-count, simultaneously, 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, with all count values 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, have the identical cycle, but have certain phase differential.
Further, the specific implementation step of this method is:
Reference frequency is f
0Signal be f by measured frequency
xSignal with frequently, have an identical period T
0, but have certain phase differential;
Reference frequency is f
0Signal to produce public frequency as reference clock control Direct Digital Synthesizer be f
cSignal, require f
cF
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 that first phase coincidence detects and coincidence impulse produces circuit, be f with reference frequency
0Signal and public frequency be f
cSignal shaping after send into that second phase coincidence detects and coincidence impulse produces circuit;
The output that first phase coincidence detects and coincidence impulse produces circuit is divided into two-way, and one the tunnel produces circuit when delivering to, produces the enabling signal of circuit during as door, another road deliver to the 3rd with door;
The output that second phase coincidence detects and coincidence impulse produces circuit is divided into two-way, and one the tunnel produces circuit when delivering to, produces the pass gate signal of circuit during as door, another road deliver to the 4th with door;
The output that when door produces circuit deliver to respectively first with door and second with door, control first with and second and open and close;
First counter and second counter respectively to send into first with the door and second and be f by measured frequency
xSignal and public frequency be f
cSignal count measuring Men Shinei, 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 respectively to send into the 3rd with door and the 4th and coincidence impulse count in when the reference gate, count value is N
3And N
4
With all count value N
x, N
c, N
3And N
4Send into single-chip microcomputer, single-chip microcomputer carries out data to be handled, and obtains final phase differential.
Provided by the invention have the correction of differing based on dual method and system of closing the ultrahigh resolution phase difference measurement of detection, the first signal shaping module is carried out shaping to tested frequency signal, Direct Digital Synthesizer produces common frequency signals according to the reference frequency signal of input, the secondary signal Shaping Module carries out shaping to common frequency signals, the 3rd signal shaping module is carried out shaping to reference frequency signal, first phase coincidence detects and coincidence impulse produces tested frequency signal and the common frequency signals of circuit after to shaping and carries out phase coincidence and detect and produce coincidence impulse, second phase coincidence detects and coincidence impulse produces common frequency signals and the reference frequency signal of circuit after to shaping and carries out phase coincidence and detect and produce coincidence impulse, the generation circuit produces the signal that signal detects as enabling signal and with second phase coincidence and coincidence impulse generation circuit is exported of circuit output as closing gate signal with the detection of first phase coincidence and coincidence impulse during door, and signal during generator gate, first counter is to sending into first and count with the tested frequency signal of door measuring Men Shinei, second counter is to sending into second and count with the common frequency signals of door measuring Men Shinei, the 3rd counter is counted with the coincidence impulse of door sending into the 3rd in when the reference gate, four-counter is counted with the coincidence impulse of door sending into the 4th in when the reference gate, single-chip microcomputer is handled enumeration data, and obtains tested frequency signal and reference frequency signal phase differential; Utilize the quarter-phase between two alien frequencies signals to overlap detection formation measurement gate, tested frequency signal and the common frequency signals of measuring Men Shinei carried out the count measurement phase differential, by to measuring the modified value that method that near the coincidence impulse of gate opening the door and closing the door count draws phase differential, realized the phase difference measurement of ultrahigh resolution, eliminated counting error, Measurement Resolution is far superior to existing filling clock resolution and delay resolution, the long term drift amount is little, the realization circuit structure is simple, be easy to integrated and commercialization, practical, have stronger popularization and using value.
Description of drawings
Fig. 1 be the embodiment of the invention provide have the correction of differing based on the dual structured flowchart that closes the ultrahigh resolution phase Difference Measuring System of detection.
Among the 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 coincidence detects and coincidence impulse generation circuit; 8, second phase coincidence detects and coincidence impulse generation circuit; 9, when door produces circuit; 10, first and the door; 11, first counter; 12, the 3rd with the door; 13, the 3rd counter; 14, the 4th with the door; 15, four-counter; 16, second and the door; 17, second counter; 18, single-chip microcomputer; 19, delay control circuit.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further described in detail.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in and limit invention.
Fig. 1 shows that the embodiment of the invention provides have the correction of differing based on dual structure of closing the ultrahigh resolution phase Difference Measuring System of detection.For convenience of explanation, only show 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, be used for the first signal shaping module 2 that tested frequency signal is carried out shaping;
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, be used for the secondary signal Shaping Module 5 that the common frequency signals that Direct Digital Synthesizer 4 produces is carried out shaping;
Be connected with reference frequency signal load module 3, be used for the 3rd signal shaping module 6 that reference frequency signal carries out shaping;
Be connected with the first signal shaping module 2 and secondary signal Shaping Module 5, be used for the tested frequency signal after the shaping and common frequency signals are carried out the detection of first phase coincidence and the coincidence impulse generation circuit 7 that phase coincidence detected and produced coincidence impulse;
Be connected with secondary signal Shaping Module 5 and the 3rd signal shaping module 6, be used for the common frequency signals after the shaping and reference frequency signal are carried out the detection of second phase coincidence and the coincidence impulse generation circuit 8 that phase coincidence detected and produced coincidence impulse;
Producing circuit 7 and the detection of second phase coincidence and coincidence impulse generation circuit 8 with the detection of first phase coincidence and coincidence impulse is connected, be used for first phase coincidence detected and signal that coincidence impulse produces circuit 7 outputs detects as enabling signal and with second phase coincidence and coincidence impulse produces circuit 8 outputs signal as closing gate signal, and produce circuit 9 during generator gate during the door of signal;
Producing circuit 9 during with first shaping circuit and door is connected, signal when producing the door of circuit 9 outputs when be used for receiving tested frequency signal after the shaping of first shaping circuit output and door, when door under the control of signal to the tested frequency signal after the shaping carry out conducting with end first with door 10;
10 be connected with door with first, be used for measuring Men Shinei, to sending into first first counter of counting with the tested frequency signal of door 10 11;
Producing circuit 9 during with second shaping circuit and door is connected, signal when producing the door of circuit 9 outputs when be used for receiving common frequency signals after the shaping of second shaping circuit output and door, when door under the control of signal to the common frequency signals after the shaping carry out conducting with end second with door 16;
16 be connected with door with second, be used for measuring Men Shinei, to sending into second second counter of counting with the common frequency signals of door 16 17;
Detect with first phase coincidence and coincidence impulse produces circuit 7 and single-chip microcomputer 18 is connected, be used for to receive tested frequency signal and common frequency signals after the shaping and detect and coincidence impulse signal when producing the reference gate of coincidence impulse that circuit 7 produces and single-chip microcomputer 18 outputs through first phase coincidence, when reference gate under the control of signal to shaping after tested frequency signal and common frequency signals through first phase coincidence detect and coincidence impulse produce coincidence impulse that circuit 7 produces carry out conducting with end the 3rd with door 12;
Detect with second phase coincidence and coincidence impulse produces circuit 8 and single-chip microcomputer 18 is connected, be used for to receive reference frequency signal and common frequency signals after the shaping and detect and coincidence impulse signal when producing the reference gate of coincidence impulse that circuit 8 produces and single-chip microcomputer 18 outputs through second phase coincidence, when reference gate under the control of signal to shaping after reference frequency signal and common frequency signals through second phase coincidence detect and coincidence impulse produce coincidence impulse that circuit 8 produces carry out conducting with end the 4th with door 14;
10 be connected with door with first, be used for measuring Men Shinei, to importing first first counter of counting with the tested frequency signal of door 10 11;
16 be connected with door with second, be used for measuring Men Shinei, to importing second second counter of counting with the common frequency signals of door 16 17;
12 be connected with door with the 3rd, be used in when the reference gate, to import the 3rd with door 12 and detected and coincidence impulse produces the 3rd counter 13 that coincidence impulse that circuit 7 produces is counted by first phase coincidence;
14 be connected with door with the 4th, be used in when the reference gate, to import the 4th with door 14 and detected and coincidence impulse produces the four-counter 15 that coincidence impulse that circuit 8 produces is counted by second phase coincidence;
Be connected with first counter 11, second counter 17, the 3rd counter 13 and four-counter 15, be used for receiving the data of first counter 11, second counter 17, the 3rd counter 13 and four-counter 15 outputs, data are handled, and obtained the single-chip microcomputer 18 of tested frequency signal and reference frequency signal phase differential.
In embodiments of the present invention, this system also is provided with:
Produce circuit 9 during with door and be connected, produce circuit 9 when being used for opposite house and carry out the delay control circuit 19 that appropriate time postpones.
Another object of the present invention is to provide a kind of have the correction of differing based on dual method of closing the ultrahigh resolution phase difference measurement of detection, this method may further comprise the steps:
Be f by reference frequency
0Signal to produce public frequency be f
cSignal, will be f by measured frequency
xSignal and public frequency be f
cSignal be input to that first phase coincidence detects and coincidence impulse produces circuit 7, phase coincidence point is as measurement gate enabling signal;
Be f with reference frequency
0Signal and public frequency be f
cSignal import that second phase coincidence detects and coincidence impulse produces circuit 8, phase coincidence point is as measuring gate pass gate signal;
Measuring Men Shinei respectively to being f by measured frequency
xSignal and public frequency be f
cSignal-count, simultaneously, 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, with all count values 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, have the identical cycle, but have certain phase differential.
In embodiments of the present invention, the specific implementation step of this method is:
Reference frequency is f
0Signal be f by measured frequency
xSignal with frequently, have an identical period T
0, but have certain phase differential;
Reference frequency is f
0Signal to produce public frequencys as reference clock control Direct Digital Synthesizer 4 be f
cSignal, require f
cF
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 that first phase coincidence detects and coincidence impulse produces circuit 7, be f with reference frequency
0Signal and public frequency be f
cSignal shaping after send into that second phase coincidence detects and coincidence impulse produces circuit 8;
The output that first phase coincidence detects and coincidence impulse produces circuit 7 is divided into two-way, and one the tunnel produces circuit 9 when delivering to, produces the enabling signal of circuit 9 during as door, another road deliver to the 3rd with door 12;
The output that second phase coincidence detects and coincidence impulse produces circuit 8 is divided into two-way, and one the tunnel produces circuit 9 when delivering to, produces the pass gate signal of circuit 9 during as door, another road deliver to the 4th with door 14;
The output that when door produces circuit 9 deliver to respectively first with door 10 and second with door 16, control first and door 10 and second and 16 opening and closing;
First counter 11 and second counter 17 respectively to send into first with door 10 and second with 16 be f by measured frequency
xSignal and public frequency be f
cSignal count measuring Men Shinei, count value is N
xAnd N
c
When single-chip microcomputer 18 produces reference gate in order to control the 3rd with the opening and closing of door the 12 and the 4th with door 14, the 3rd counter 13 and four-counter 15 respectively to send into the 3rd with count in door the 12 and the 4th and door 14 coincidence impulse are when the reference gate, count value is N
3And N
4
With all count value N
x, N
c, N
3And N
4Send into single-chip microcomputer 18, single-chip microcomputer 18 carries out data to be handled, and 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 shortcomings such as counting in the phase difference measurement technology and quantization error and long term drift be big, a kind of quarter-phase coincidence detection formation measurement gate that utilizes between the alien frequencies signal has been proposed, to measuring the method for being carried out the count measurement phase differential by measured frequency and public frequency of Men Shinei, count the modified value that draws phase differential by near the coincidence impulse the measurement gate is opened the door and closes the door, thereby realize the phase difference measurement of ultrahigh resolution.
Technical matters to be solved by this invention is the deficiency that exists in the existing phase difference measurement technology, provide a kind of have the correction of differing based on dual method and system of closing the ultrahigh resolution phase difference measurement of detection, concrete principle of work is: two comparison signal f with same frequency
0And f
x, f wherein
0Be reference frequency, f
xFor by measured frequency, f
xAnd f
0Have certain phase differential, two signals have the identical cycle, are designated as T
0f
0Produce public frequency f as reference clock control Direct Digital Synthesizer 4
c, require f
cF
0, its cycle is designated as T
cWith f
xAnd f
cSend into the detection of first phase coincidence and coincidence impulse after the shaping and produce circuit 7, with f
0And f
cSend into the detection of second phase coincidence and coincidence impulse after the shaping and produce circuit 8.The output that first phase coincidence detects and coincidence impulse produces circuit 7 is divided into two-way, and one the tunnel produces circuit 9 when delivering to, produces the enabling signal of circuit 9 during as door, another road deliver to the 3rd with door 12; The output that second phase coincidence detects and coincidence impulse produces circuit 8 is divided into two-way, and one the tunnel produces circuit 9 when delivering to, produces the pass gate signal of circuit 9 during as door, another road deliver to the 4th with door 14; Delay control circuit 19 produces circuit 9 and carries out the reasonable time delay when being used for opposite house; The output that when door produces circuit 9 deliver to respectively first with door 10 and second with door 16, be used for controlling first with the opening and closing of door 10 and second and 16; First counter 11 and second counter 17 be used for respectively to send into first with door 10 and second with 16 f
xAnd f
cMen Shinei counts in measurement, and count value is N
xAnd N
cWhen single-chip microcomputer 18 produces reference gate in order to control the 3rd with the opening and closing of door the 12 and the 4th with door 14, the 3rd counter 13 and four-counter 15 be used for respectively to send into the 3rd with count in door the 12 and the 4th and door 14 coincidence impulse are when the reference gate, count value is N
3And N
4With all count value N
x, N
c, N
3And N
4Send into single-chip microcomputer 18, single-chip microcomputer 18 carries out data to be handled, and obtains final phase differential.
High-accuracy time phase, simultaneous techniques had important effect in high-tech areas such as communication, Aero-Space, navigator fix, the phase difference measurement technology of ultrahigh resolution is the core of high-accuracy time phase of simultaneous techniques, and the accuracy of phase difference measurement is determining time phase synchronously and the precision of related application to a great extent between the comparison signal.
This have the correction of differing based on dual method and system of closing the ultrahigh resolution phase difference measurement of detection, what adopt from principle is phase place group synchronization and quantize phase place stepping principle and the faciation position overlaps principle between the alien frequencies signal, namely the phase relation between two alien frequencies signals always never overlaps and carries out the transition to coincidence gradually, carry out the transition to the process that does not overlap again, and the phase difference value of two alien frequencies signals is that step value changes to quantize phase place between two adjacent phase coincidence points, so just two alien frequencies phase difference between signals have been carried out discretize between the two phase place coincide point, reduce the measurement difficulty, eliminated counting and quantization error; Simultaneously, by the difference near the phase coincidence step-by-step counting two phase place coincide point, final phase differential is revised, improved Measurement Resolution; Owing to do not adopt analog device, long-term measurement drift is less.
The phase difference measurement that the inventive method realizes can arrive the Measurement Resolution that is better than psec.This method resolution under the more little situation of the frequency difference between public frequency and two the comparison signals (by measured frequency and reference frequency) is more high, even for the bigger situation of frequency difference, also can obtain than the better Measurement Resolution of existing method for measuring phase difference.
The embodiment of the invention provides have the correction of differing based on dual method and system of closing the ultrahigh resolution phase difference measurement of detection, 2 pairs of tested frequency signals of the first signal shaping module carry out shaping, Direct Digital Synthesizer 4 produces common frequency signals according to the reference frequency signal of input, 5 pairs of common frequency signals of secondary signal Shaping Module carry out shaping, 6 pairs of reference frequency signals of the 3rd signal shaping module carry out shaping, tested frequency signal and common frequency signals that the detection of first phase coincidence and coincidence impulse produce after 7 pairs of shapings of circuit carry out the phase coincidence detection and produce coincidence impulse, common frequency signals and reference frequency signal that the detection of second phase coincidence and coincidence impulse produce after 8 pairs of shapings of circuit carry out the phase coincidence detection and produce coincidence impulse, generation circuit 9 produces the signal that signal detects as enabling signal and with second phase coincidence and coincidence impulse generation circuit 8 is exported of circuit 7 outputs as closing gate signal with the detection of first phase coincidence and coincidence impulse during door, and signal during generator gate, 11 pairs in first counter is sent into first and is counted with the tested frequency signal of door 10 measuring Men Shinei, 17 pairs in second counter is sent into second and is counted with the common frequency signals of door 16 measuring Men Shinei, 13 pairs in the 3rd counter is sent into the 3rd in when reference gate and is counted with the coincidence impulse of door 12,15 pairs of four-counters are sent into the 4th in when reference gate and are counted with the coincidence impulse of door 14,18 pairs of enumeration datas of single-chip microcomputer are handled, and obtain tested frequency signal and reference frequency signal phase differential; Utilize the quarter-phase between two alien frequencies signals to overlap detection formation measurement gate, tested frequency signal and the common frequency signals of measuring Men Shinei carried out the count measurement phase differential, by to measuring the modified value that method that near the coincidence impulse of gate opening the door and closing the door count draws phase differential, realized the phase difference measurement of ultrahigh resolution, eliminated counting error, Measurement Resolution is far superior to existing filling clock resolution and delay resolution, the long term drift amount is little, the realization circuit structure is simple, be easy to integrated and commercialization, practical, have stronger popularization and using value.
Below only be preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
- One kind have the correction of differing based on dual system of closing the ultrahigh resolution phase difference measurement of detection, it is characterized in that this system comprises:Tested frequency signal load module;The reference frequency signal load module;Be connected with described tested frequency signal load module, be used for the first signal shaping module that tested frequency signal is carried out shaping;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, be used for the secondary signal Shaping Module that the common frequency signals that described Direct Digital Synthesizer produces is carried out shaping;Be connected with described reference frequency signal load module, be used for the 3rd signal shaping module that reference frequency signal carries out shaping;Be connected with the described first signal shaping module and secondary signal Shaping Module, be used for the tested frequency signal after the shaping and common frequency signals are carried out the detection of first phase coincidence and the coincidence impulse generation circuit that phase coincidence detected and produced coincidence impulse;Be connected with described secondary signal Shaping Module and the 3rd signal shaping module, be used for the common frequency signals after the shaping and reference frequency signal are carried out the detection of second phase coincidence and the coincidence impulse generation circuit that phase coincidence detected and produced coincidence impulse;Producing circuit and the detection of second phase coincidence and coincidence impulse generation circuit with described first phase coincidence detection and coincidence impulse is connected, be used for will described first phase coincidence detect and signal that coincidence impulse produces circuit output as enabling signal and will described second phase coincidence detect and signal that coincidence impulse produces circuit output as closing gate signal, and during generator gate signal the time generation circuit;Producing circuit during with described first shaping circuit and door is connected, signal when producing the door of circuit output when be used for receiving tested frequency signal after the shaping of described first shaping circuit output and door, when door under the control of signal to the tested frequency signal after the shaping carry out conducting with end first with door;Be connected with door with described first, be used for measuring Men Shinei, to sending into described first first counter of counting with the tested frequency signal of door;Producing circuit during with described second shaping circuit and door is connected, signal when producing the door of circuit output when be used for receiving common frequency signals after the shaping of described second shaping circuit output and door, when door under the control of signal to the common frequency signals after the shaping carry out conducting with end second with door;Be connected with door with described second, be used for measuring Men Shinei, to sending into described second second counter of counting with the common frequency signals of door;Detect with described first phase coincidence and coincidence impulse produces circuit and single-chip microcomputer is connected, be used for to receive tested frequency signal and common frequency signals after the shaping and detect and coincidence impulse signal when producing the reference gate of coincidence impulse that circuit produces and the output of described single-chip microcomputer through described first phase coincidence, when reference gate under the control of signal to shaping after tested frequency signal and common frequency signals through described first phase coincidence detect and coincidence impulse produce coincidence impulse that circuit produces carry out conducting with end the 3rd with door;Be connected with door with the described the 3rd, be used in when the reference gate, to import the 3rd with door and detected and coincidence impulse produces the 3rd counter that coincidence impulse that circuit produces is counted by described first phase coincidence;Detect with described second phase coincidence and coincidence impulse produces circuit and single-chip microcomputer is connected, be used for to receive reference frequency signal and common frequency signals after the shaping and detect and coincidence impulse signal when producing the reference gate of coincidence impulse that circuit produces and the output of described single-chip microcomputer through described second phase coincidence, when reference gate under the control of signal to shaping after reference frequency signal and common frequency signals through described second phase coincidence detect and coincidence impulse produce coincidence impulse that circuit produces carry out conducting with end the 4th with door;Be connected with door with the described the 4th, be used in when the reference gate, to import the 4th with door and detected and coincidence impulse produces the four-counter that coincidence impulse that circuit produces is counted by described second phase coincidence;Be connected with described first counter, second counter, the 3rd counter and four-counter, be used for receiving the data of described first counter, second counter, the 3rd counter and four-counter output, data are handled, and obtained the single-chip microcomputer of tested frequency signal and reference frequency signal phase differential.
- As claimed in claim 1 have the correction of differing based on dual system of closing the ultrahigh resolution phase difference measurement of detection, it is characterized in that this system also is provided with:Produce circuit during with described door and be connected, produce circuit when being used for opposite house and carry out the delay control circuit that appropriate time postpones.
- One kind have the correction of differing based on dual method of closing the ultrahigh resolution phase difference measurement of detection, it is characterized in that this method may further comprise the steps:Be f by reference frequency 0Signal to produce public frequency be f cSignal, will be f by measured frequency xSignal and public frequency be f cSignal be input to that first phase coincidence detects and coincidence impulse produces circuit, phase coincidence point is as measurement gate enabling signal;Be f with reference frequency 0Signal and public frequency be f cSignal import that second phase coincidence detects and coincidence impulse produces circuit, phase coincidence point is as measuring gate pass gate signal;Measuring Men Shinei respectively to being f by measured frequency xSignal and public frequency be f cSignal-count, simultaneously, 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, with all count values input single-chip microcomputers, trying to achieve by measured frequency is f xSignal and reference frequency be f 0The phase differential of signal.
- As claimed in claim 3 have the correction of differing based on dual method of closing the ultrahigh resolution phase difference measurement of detection, it is characterized in that reference frequency is f 0Signal be f by measured frequency xSignal with frequently, have the identical cycle, but have certain phase differential.
- As claimed in claim 3 have the correction of differing based on dual method of closing the ultrahigh resolution phase difference measurement of detection, it is characterized in that the specific implementation step of this method is:Reference frequency is f 0Signal be f by measured frequency xSignal with frequently, have an identical period T 0, but have certain phase differential;Reference frequency is f 0Signal to produce public frequency as reference clock control Direct Digital Synthesizer be f cSignal, require f cF 0, the cycle is designated as T cTo be f by measured frequency xSignal and public frequency be f cSignal shaping after send into that first phase coincidence detects and coincidence impulse produces circuit, be f with reference frequency 0Signal and public frequency be f cSignal shaping after send into that second phase coincidence detects and coincidence impulse produces circuit;The output that first phase coincidence detects and coincidence impulse produces circuit is divided into two-way, and one the tunnel produces circuit when delivering to, produces the enabling signal of circuit during as door, another road deliver to the 3rd with door;The output that second phase coincidence detects and coincidence impulse produces circuit is divided into two-way, and one the tunnel produces circuit when delivering to, produces the pass gate signal of circuit during as door, another road deliver to the 4th with door;The output that when door produces circuit deliver to respectively first with door and second with door, control first with and second and open and close;First counter and second counter respectively to send into first with the door and second and be f by measured frequency xSignal and public frequency be f cSignal count measuring Men Shinei, count value is N xAnd N cWhen 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 respectively to send into the 3rd with door and the 4th and coincidence impulse count in when the reference gate, count value is N 3And N 4With all count value N x, N c, N 3And N 4Send into single-chip microcomputer, single-chip microcomputer carries out data to be handled, and obtains final phase differential.
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| CN113376999A (en) * | 2021-06-08 | 2021-09-10 | 西安电子科技大学 | Special adder for high time resolution time-to-digital converter |
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| 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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