CN86101904A - Intelligence frequency meter with high-resolution - Google Patents

Intelligence frequency meter with high-resolution Download PDF

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Publication number
CN86101904A
CN86101904A CN86101904.0A CN86101904A CN86101904A CN 86101904 A CN86101904 A CN 86101904A CN 86101904 A CN86101904 A CN 86101904A CN 86101904 A CN86101904 A CN 86101904A
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China
Prior art keywords
frequency
beat
set point
mixer
signal
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CN86101904.0A
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Chinese (zh)
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CN1007089B (en
Inventor
周渭
俞应华
杨建恒
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Shaanxi Inst Of Metrology & Test
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Shaanxi Inst Of Metrology & Test
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Priority to CN 86101904 priority Critical patent/CN1007089B/en
Publication of CN86101904A publication Critical patent/CN86101904A/en
Publication of CN1007089B publication Critical patent/CN1007089B/en
Expired legal-status Critical Current

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Abstract

Intelligence frequency meter with high-resolution belongs to the radio survey technical field.The present invention proposes double mixer phase difference method measuring method, and use the instrument that this method provides a kind of a tractor serves several purposes.Adopt the crystal oscillator of mantissa's offset in the instrument; The beat frequency mixer constitutes with the ECLD trigger; Varactor doubler is made up of an XOR gate and a delay circuit.Instrument of the present invention can to the fixed point frequency marking of 20MHz, 10MHz and 5MHz/n (n is a positive integer) carry out high-resolution frequency measurement, frequency ratio to, time difference measurement, phase place comparison, surely measure frequently, can carry out frequency, cycle, time difference measurement to the signal of 0.1Hz～100MHz again.Circuit is simple, cost is low, precision is high.

Description

Intelligence frequency meter with high-resolution
The invention belongs to the radio survey technical field, specifically relate to the surveying instrument of frequency, cycle, the time difference, phase place, frequently steady measuring method design.
The designed digital frequency meter of common employed employing synchronous measurement technique, interior frequency marking is the integer crystal oscillator, can only carry out measurements such as frequency, cycle, the time difference to the signal of a certain frequency range.The fixed point frequency marking is carried out high-resolution frequency measurement, frequency ratio other special test equipment is then used in the measurement of, time difference measurement, phase place comparison, frequency stability.According to D.W.allan NBS, H, Daams, NRC " Picosecond Time Difference Measurement System " Proc.of the 29tn Annu.Symp.on.freq.cont.Symp(1975) 404-411 introduces NBS (NBS) and adopts the double mixer time difference method that the fixed point frequency marking is measured, this method will be subjected to the influence of common crystal oscillator frequency change value, and is therefore high especially to the requirement of common crystal oscillator: require the frequency drift of common crystal oscillator much smaller than the measured signal frequency drift for long-term index measurement; Measure for short run target, in order to eliminate the common crystal oscillator noise effect, to transfer two Beat Signal phase differential after the mixing quite for a short time, to add phase shifter for this reason, but the adding of phase shifter has improved equipment manufacturing cost, introduce additional noise, made measuring system (equipment) can not take into account the frequency marking index measurement of long and short phase simultaneously again.
One of purpose of the present invention is to have proposed double mixer phase difference method measuring method at the existing problem of double mixer time difference method, to exempt the drift influence of common crystal oscillator, reduce the cost of measuring equipment, make it can take into account the measurement of long and short phase frequency marking index simultaneously.Two of purpose provides a surveying instrument, can be positive integer to 20MHz, 10MHz and 5MHz/n(n) the fixed point frequency marking carry out high-resolution frequency measurement, frequency ratio to, time difference measurement, phase measurement, frequency stability measurement, the intelligence frequency meter with high-resolution that can measure frequency, cycle, the time difference in 0.1Hz～100MHz scope again.
Double mixer phase difference method measuring method proposed by the invention, its main points are to tested set point signal f xWith reference set point signal f oCarry out beat mixing or harmonic mixing with common crystal oscillator by beat frequency mixer A and beat frequency mixer B respectively, then the relative phase difference of two Beat Signals is measured.
Use the intelligence frequency meter with high-resolution of measuring method design proposed by the invention, its main points are to adopt the crystal oscillator of mantissa's offset both as the common crystal oscillator in the double mixer phase difference method measuring method, as the interior frequency marking of frequency meter, storbing gate A, gating master door B, gating master door C and storbing gate D are set simultaneously again.Set beat frequency mixer adopts the ECL d type flip flop to constitute, its principle is the level state according to d type flip flop output when depending on that cp end input signal arrives, the level state of D end (being the relative phase situation of periodic D end input signal with respect to cp end input signal) and constituted and have phase place and change the beat mixing of distinguishing ability or the circuit of harmonic mixing complete cycle.The interior frequency standard signal of common crystal oscillator inserts the D end of ECL d type flip flop, and the tested set point signal f that brings in by input xOr with reference to set point signal f oInsert the cp end (earlier through four frequency divisions, send into the cp end then, other tested set point signal directly inserts the cp end for the tested set point signal of 20MHz and 10MHz) of ECL d type flip flop; Varactor doubler in set control frequency division and the two frequency multiplication networks is made up of an XOR gate and a delay circuit, when input signal is the square wave of a symmetry, one the tunnel directly inserts an end of XOR gate, another road then is output as the square wave of two frequencys multiplication through the other end of delay circuit access XOR gate.
Schematic block circuit diagram of the present invention as shown in Figure 1, (1) expression frequency measurement in the accompanying drawing 1, (2) week is surveyed in expression, (3) time difference is surveyed in expression, (4) expression is carried out the high resolution bathymetric time difference to the fixed point frequency marking, (5) expression is carried out the high resolving power frequency measurement to the fixed point frequency marking, and it is right that (6) expression is carried out the high precision frequency ratio to the fixed point frequency marking, and (7) expression is carried out frequency stability measurement to the fixed point frequency marking.
Below every measurement function of the present invention 1 is illustrated in conjunction with the accompanying drawings:
(1) frequency measurement: the sample trap could not gate signal and the measured signal f that obtain frequency division by common crystal oscillator through control frequency division and two frequency multiplication networks xIf process amplifier A(is f xBe 25MHz～100MHz, then through amplifying with four-divider), form sync gate through resulting signal behind the storbing gate A through synchronizing network again, remove control counter A sum counter B through gating master door B and gating master door C simultaneously respectively then, counter A counts the signal of being exported from storbing gate A in sync gate; Meanwhile counter B counts the markers that frequency marking is exported through control frequency division and two frequency multiplication networks in sync gate, sends into the microcomputer formula then:
f x=(n A/ n B) f s(if the signal of storbing gate A institute gating is from amplifying and four-divider, then f x=(4n A/ n B) f s)
Calculate, can obtain measured signal f xFrequency values f x
Wherein: n AThe counting of-counter A;
n BThe counting of-counter B;
f s-ticking frequency value.
(2) survey week: whole process is identical with frequency measurement, and just computing formula is used
T X=(n B/ n A) T s(if the signal of storbing gate A institute gating is from amplifying and four-divider, then T x=(n B/ 4n A) T s) substitute, can obtain measured signal f xPeriodic quantity T X
T wherein s-time mark cycle.
(3) survey the time difference: from the signal of storbing gate A and from the signal of amplifier B respectively as the opening the door and close gate signal and go control counter A that markers is counted of gating master door B, send into the microcomputer formula then:
△t＝n A·T S
Calculate f xAnd f oAbsolute time difference △ t between the input signal.
More than interior frequency marking mantissa offset influence in three function machines, after formula calculates, all eliminate.
(4) the high resolving power measuring point frequency marking time difference: to Beat Signal from beat frequency mixer A, through control frequency division A(if when surveying absolute time difference, frequency dividing ratio is 1) deliver to gating master door B as enabling signal, to Beat Signal from beat frequency mixer B, through control frequency division B(if when surveying absolute time difference, frequency dividing ratio is 1) deliver to gating master door B as closing gate signal, form a gate and go control counter A that markers is counted (timing is poor); Signal to being exported from control frequency division A passes through gating master door C control counter B markers is counted (meter cycle) simultaneously, sends into microcomputer then, uses formula:
△t＝（n A/n B）·T xo
Calculate tested set point signal (frequency marking) f xWith reference set point signal (frequency marking) f oAbsolute time difference △ t.
T wherein Xo-measured signal f xThe nominal period value.
(5) frequency of high resolving power measuring point frequency marking: the signal of being exported by the interior frequency marking and the storbing gate A of common crystal oscillator output carries out the beat mixing through beat frequency mixer A, arrive gating master door B through control frequency division A again, form gate and go control counter A that markers is calculated, send into the microcomputer formula then:
△f x/f o＝（n A·T S-M·T c）/M·T c·（f g·T c-1）
Calculate tested set point signal (frequency marking) f xRelative error △ f x/ f o
M-control frequency division A(control frequency division B wherein) frequency division number of times;
T c-beat frequency mixer A(beat frequency mixer B) the nominal period value of output signal;
f gThe nominal frequency value of-common crystal oscillator.
(6) the high precision frequency ratio of fixed point frequency marking is right: the signal from control frequency division A goes control counter A that markers is counted through gating master door B, signal from control frequency division B goes control counter B that markers is counted through gating master door C simultaneously, sends into the microcomputer formula then:
△f x/f o＝（n A-n B）/n B·（f g·T c-1）
Calculate tested set point signal (frequency marking) f xRelative error △ f x/ f o
(7) stable measurement of fixed point frequency marking: send into two-divider (constituting) with JK flip-flop by the signal that control frequency division A comes, hold the signal of exporting two opposite states respectively from Q and Q, go control counter A sum counter B that markers is carried out a N continuous alternately continuous counting through gating master door B and gating master door C respectively again, send into the microcomputer formula then:
σ＝〔T S/M·T c·（f g·T c-1）〕 Σ i = 1 N (n i+1 -n i ) 2 /2N
Calculate corresponding to counting M gate time, T cFrequency stability value σ.
N wherein i-with counter A sum counter B replace the counting the i time counting;
n I+1-with counter A sum counter B replace the counting the i+1 time counting;
The N-sampling number.
(8) the phase place comparison of high resolving power fixed point frequency marking: two Beat Signals being exported by beat frequency mixer A and beat frequency mixer B are carried out phase demodulation with the phase demodulation bistable circuit, just can obtain set point signal (frequency marking) f through wave filter then xWith respect to reference signal (frequency marking) f oThe phase differential level, i.e. phase place comparison value.
Double mixer phase difference method measuring method proposed by the invention also can be used for the design of phasometer and linear phase comparison instrument.
Advantage of the present invention with effect is: compare with the general digital frequency meter of synchronous measurement technique that adopts, tens gate circuits and trigger have just been increased, just can be designed to the intelligence frequency meter with high-resolution of a tractor serves several purposes, for the frequency in 0.1Hz～100MHz scope, cycle, time difference measurement, kept former measuring accuracy.Its technical indicator is as follows:
1, frequency measurement and survey Zhou Jun show to return-to change precision in 0.1Hz～100MHz scope, are not less than
2×10 -8/10S，2×10 -7/S，
2×10 -6/100mS，2×10 -5/10mS。
Direct display frequency value and periodic quantity.
2, time difference measurement: scope 1 μ S-10S
Measuring accuracy 100nS
And the technical indicator that the fixed point frequency marking is measured is:
3, the measurement of scale value again and again:
Measurement Resolution: 2 * 10 -11/ S
4, frequency ratio is right: 1 * 10 -11/ 10S
5, time difference measurement: 100pS, being used for frequency measurement is 5 * 10 -14/ hour, 2 * 10 -15/ day.
6, phase place comparison: than phase jack output record precision 2 * 10 -14/ day, 6 * 10 -13/ hour.
7, frequency stability: be used for directly measuring and showing with the Allan variance form
2×10 -9/10mS，2×10 -10/0.1S，
2×10 -11/S，5×10 -12/10S。
Can reach behind the band expansion plugin
1×10 -10/10mS，1×10 -11/0.1S，
1×10 -12/S，3×10 -13/10S。
Compare with the measuring equipment that adopts the double mixer time difference method, avoided using expensive high precision collective frequency meter and phase shifter, so cheap, cost is reduced to 3% of former cost approximately, increased the function of measuring long-term frequency marking, and precision is higher than Other Instruments more than 10 times.
Beat frequency mixer and varactor doubler circuit among the present invention are simple, use components and parts few.Circuit also is simple from complete machine structure, the low and precision height of cost.
The inventor once made an embodiment, and logical circuitry is shown in accompanying drawing 2 and accompanying drawing 3.(1), (2) in accompanying drawing 2, the accompanying drawing 3, (3), (4), (5), (6), and (7) identical with accompanying drawing 1 note.(8), (9), (10), (11) and (12) represent that wherein (8) are f with the control of panel to measuring in the accompanying drawing 2 xNot frequency division control, (9) are f xFour frequency division controls, (10) are the control of 10MHz markers, and (11) are the control of 1MHz markers, and (12) are the control of 10KHZ markers.
Accompanying drawing 3 is the detailed logic circuit diagram of control section in the accompanying drawing 2.

Claims (5)

1, a kind of double mixer phase difference method measuring method is characterized in that tested set point signal f xWith reference set point signal f oCarry out beat mixing or harmonic mixing with common crystal oscillator by beat frequency mixer A and beat frequency mixer B respectively, then the relative phase difference of two Beat Signals is measured.
2, according to the said double mixer phase difference method of claim 1 measuring method, it is characterized in that one the tunnel carries out time difference counting with counter A to two Beat Signals, simultaneously another road with counter B to tested set point signal f xCycle through the Beat Signal after the beat mixing counts, and uses formula then:
△t＝（n A/n B）·T xo
Calculate tested set point signal f xWith reference set point signal f oBetween absolute time difference △ t.
3, according to the said double mixer phase difference method of claim 1 measuring method, it is characterized in that two beat mixed frequency signals being exported by beat frequency mixer A and beat frequency mixer B are carried out phase demodulation with the phase demodulation bistable circuit, obtain tested set point signal f through wave filter then xWith reference set point signal f oThe phase differential level, i.e. phase place comparison value.
4, use the intelligence frequency meter with high-resolution of double mixer phase difference method measuring method, it is characterized in that adopting the crystal oscillator of mantissa's offset, both as the common crystal oscillator in the double mixer phase difference method measuring method, as the interior frequency marking of frequency meter, storbing gate A, gating master door B, gating master door C and storbing gate D are set simultaneously again.
5, according to the said intelligence frequency meter with high-resolution of claim 4, it is characterized in that adopting the ECL d type flip flop to constitute the beat frequency mixer, insert the D end of ECL d type flip flop with the interior frequency standard signal of common crystal oscillator, and the tested set point signal f that brings in by input xOr with reference to set point signal f oInsert the cp end of ECL d type flip flop.
CN 86101904 1986-03-18 1986-03-18 Intelligence frequency meter with high-resolution Expired CN1007089B (en)

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Application Number Priority Date Filing Date Title
CN 86101904 CN1007089B (en) 1986-03-18 1986-03-18 Intelligence frequency meter with high-resolution

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Application Number Priority Date Filing Date Title
CN 86101904 CN1007089B (en) 1986-03-18 1986-03-18 Intelligence frequency meter with high-resolution

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CN86101904A true CN86101904A (en) 1987-02-25
CN1007089B CN1007089B (en) 1990-03-07

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102495283A (en) * 2011-12-09 2012-06-13 中国人民解放军第二炮兵计量站 Self-adaptive equal-precision frequency measuring method
CN103941086A (en) * 2014-03-25 2014-07-23 中国科学院长春光学精密机械与物理研究所 Ultrahigh precision frequency measurement instrument and measuring method thereof
CN104569580A (en) * 2014-12-30 2015-04-29 安徽丹凤集团桐城玻璃纤维有限公司 Broadband digital frequency meter
CN106950429A (en) * 2017-02-27 2017-07-14 广州市香港科大霍英东研究院 A kind of position signalling fast decoding method and system
CN108333425A (en) * 2018-01-16 2018-07-27 南昌大学 A kind of digital frequency meter
CN111999559A (en) * 2020-08-28 2020-11-27 西安电子科技大学 Digital linear phase comparison method based on double ADCs

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102495283A (en) * 2011-12-09 2012-06-13 中国人民解放军第二炮兵计量站 Self-adaptive equal-precision frequency measuring method
CN102495283B (en) * 2011-12-09 2014-01-15 中国人民解放军第二炮兵计量站 Self-adaptive equal-precision frequency measuring method
CN103941086A (en) * 2014-03-25 2014-07-23 中国科学院长春光学精密机械与物理研究所 Ultrahigh precision frequency measurement instrument and measuring method thereof
CN104569580A (en) * 2014-12-30 2015-04-29 安徽丹凤集团桐城玻璃纤维有限公司 Broadband digital frequency meter
CN106950429A (en) * 2017-02-27 2017-07-14 广州市香港科大霍英东研究院 A kind of position signalling fast decoding method and system
CN108333425A (en) * 2018-01-16 2018-07-27 南昌大学 A kind of digital frequency meter
CN108333425B (en) * 2018-01-16 2024-03-29 南昌大学 Digital frequency meter
CN111999559A (en) * 2020-08-28 2020-11-27 西安电子科技大学 Digital linear phase comparison method based on double ADCs
CN111999559B (en) * 2020-08-28 2021-08-31 西安电子科技大学 Digital linear phase comparison method based on double ADCs

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