CN1007089B - Intelligence frequency meter with high-resolution - Google Patents
Intelligence frequency meter with high-resolutionInfo
- Publication number
- CN1007089B CN1007089B CN 86101904 CN86101904A CN1007089B CN 1007089 B CN1007089 B CN 1007089B CN 86101904 CN86101904 CN 86101904 CN 86101904 A CN86101904 A CN 86101904A CN 1007089 B CN1007089 B CN 1007089B
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- CN
- China
- Prior art keywords
- frequency
- signal
- measurement
- beat
- crystal oscillator
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Abstract
The present invention relates to an intelligence frequency meter with high-resolution, which belongs to the technical field of radio measurement. The present invention provides a measuring method of a double mixer phase difference method and a versatile instrument using the measuring method, wherein the instrument adopts a crystal oscillator with offset mantissa; a beat mixer is composed of an ECLD trigger; a frequency doubler is composed of an exclusive OR gate and a time delay circuit. The instrument of the present invention not only can carry frequency measurement, frequency comparison, time difference measurement, phase comparison and frequency stability measurement with high resolution on a fixed point frequency scale of 20MHZ 10MHZ and 5 MHZ/n(n is a positive integer), but also can carry out frequency measurement, period measurement and time difference measurement on a signal of 0.1HZ to 100MHZ. The present invention has the advantages of simple line, low cost and high precision.
Description
The invention belongs to the radio survey technical field, specifically relate to frequency, cycle, the time difference, phase place, frequently steady surveying instrument.
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 frequency measurement, frequency ratio of the fixed point frequency marking being carried out high resolution then used other special test equipment to 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.The double mixer width of cloth phase detection method that proposes according to U.S. Pat-3986113 again, though the frequency measurement, frequency ratio that also can be used for the fixed point frequency marking is carried out high resolution are to the measurement of, time difference measurement, phase place comparison, frequency stability, what but its terminal processes device adopted is width of cloth phase wave detector, the voltage signal of its output is unfavorable for ringing when fast to be handled, handle if ring when wanting fast, then will use than complex apparatus (measurement mechanism that rings when fast).
The purpose of this invention is to provide a surveying instrument, can be positive integer to 20MHz, 10MHz and 5MHz/n(n) the frequency measurement, frequency ratio of carrying out high resolution of fixed point frequency marking to, time difference measurement, phase measurement, frequency stability measurement, the high resolution intelligent universal frequency meter that can measure frequency, cycle, the time difference in 0.1Hz～100MHz scope again.
The high resolution intelligent universal frequency meter that the present invention proposes, comprise crystal oscillator, amplify and four frequency divisions, amplifier A, storbing gate A, control frequency division and two frequency multiplication networks, synchronizing network, gating master door B, gating master door C, storbing gate D, counter A, counter B and microcomputer that its main points are common crystal oscillator that crystal oscillator adopts mantissa's offset.Also set up: amplify with reference to set point signal f.Amplifier B; To reference set point signal f.Carry out the beat frequency mixer B of beat mixing or harmonic mixing with common crystal oscillator; The output signal of beat frequency mixer B is controlled the control frequency division B of frequency division; The signal of measured signal fx and common crystal oscillator is carried out the beat frequency mixer A of beat mixing or harmonic mixing; The output signal of beat frequency mixer is controlled the control frequency division A of frequency division; Between control frequency division A and gating master door B, gating master door C, also be provided with two-divider in addition.The crystal oscillator of mantissa's offset had both been made the common crystal oscillator of beat frequency mixer A and beat frequency mixer B, again as the interior frequency marking of frequency meter.Be actually and use the method that double mixer phase difference method and synchronous measurement technique combine and measure.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 fx that brings in by input or with reference to set point signal f.Insert the cp end (earlier through four frequency divisions, send into the cp end for the tested set point signal of 20MHz and 10MHz then, other tested set point signal directly inserts the cp end) 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 fx that are obtained frequency division by common crystal oscillator process control frequency division and two frequency multiplication networks are 25MHz～100MHz through amplifier A(as if fx, then through amplifying and four-divider), form sync gate through synchronizing network together through resulting signal behind the storbing gate A 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:
Fx=(n
A/ n
B) fs[if the signal of storbing gate A institute gating from amplifying and four-divider, then fx=(4n
A/ n
B) fs]
Calculate, can obtain the frequency values fx of measured signal fx.
Wherein: n
AThe counting of-counter A;
n
BThe counting of-counter B;
Fs-ticking frequency value.
(2) survey week: whole process is identical with frequency measurement, and just computing formula is used
Tx=(n
B/ n
A) Ts[if the used signal of storbing gate A from amplifying and four-divider, then Tx=(n
B/ 4n
A) Ts] substitute, can obtain the periodic quantity Ts of measured signal fx.
Ts-time mark cycle wherein.
(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·Ts
Calculate fx and 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 resolution 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）·Tx。
Calculate tested set point signal (frequency marking) fx and with reference to set point signal (frequency marking) f
oAbsolute time difference △ t.
Tx wherein
oThe nominal period value of-measured signal fx.
(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:
△fx/f
o＝（n
A·Ts-M·Tc）/M·Tc·（fg·Tc-1）
Calculate the relative error △ fx/f of tested set point signal (frequency marking) fx
o
M-control frequency division A(control frequency division B wherein) frequency division number of times;
Tc-beat frequency mixer A(beat frequency mixer B) the nominal period value of output signal;
The nominal frequency value of fg-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 calculated 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:
△fx/f
o＝（n
A-n
B）/n
B·（fg·Tc-1）
Calculate the relative error △ fx/f of tested set point signal (frequency marking) fx
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＝[Ts/M·Tc·（fg·Tc-1）]
Calculate frequency stability value σ corresponding to counting MTc gate time.
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 resolution 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) fx with respect to reference signal (frequency marking) f through wave filter then
oThe phase differential level, i.e. phase place comparison value.
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, frequency, cycle, time difference measurement in 0.1Hz～100MHz scope have kept former measuring accuracy.Its technical indicator is as follows:
1. frequency measurement and survey Zhou Jun show with the normalization 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 frequency marking value:
Measure 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.
Compare with US-3986113, terminal of the present invention does not adopt width of cloth phase wave detector, and has adopted two counters, has avoided voltage signal to be unfavorable for the problem of fast time response.
Beat frequency mixer and varactor doubler circuit among the present invention are simple, use components and parts few, and circuit also is simple from complete machine structure, the low and precision height of cost.
The inventor once made an example, 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) are identical with accompanying drawing 1 note.(8), (9), (10), (11) and (12) are represented with the control of panel to measuring in the accompanying drawing 2, wherein (8) are not frequency division control of fx, and (9) are fx four frequency division controls, and (10) are the control of 10MHz markers, (11) be the control of 1MHz markers, (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 (2)
1, a kind of intelligence frequency meter with high-resolution, comprise crystal oscillator, amplifier and four frequency divisions, amplifier A, storbing gate A, control frequency division and two frequency multiplication networks, synchronizing network, gating master door B, gating master door C, storbing gate D, counter A, counter B and microcomputer, it is characterized in that
(1). crystal oscillator adopts the common crystal oscillator of mantissa's offset,
(2). be provided with: amplify with reference to set point signal f
oAmplifier B, to reference set point signal f
oCarry out the beat frequency mixer B of beat mixing or harmonic mixing with the signal of common crystal oscillator, the output signal of beat frequency mixer B is controlled the control frequency divider B of frequency division, the signal of measured signal fx and common crystal oscillator is carried out the beat frequency mixer A of beat mixing or harmonic mixing, the output signal of beat frequency mixer is controlled the control frequency division A of frequency division, between control frequency division A and gating master door B, gating master door C, also be provided with two-divider.
2, according to the said intelligence frequency meter with high-resolution of claim 1, 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 fx that brings in by input or with reference to set point signal f.Insert the cp end of ECL d type flip flop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86101904 CN1007089B (en) | 1986-03-18 | 1986-03-18 | Intelligence frequency meter with high-resolution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86101904 CN1007089B (en) | 1986-03-18 | 1986-03-18 | Intelligence frequency meter with high-resolution |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86101904A CN86101904A (en) | 1987-02-25 |
| CN1007089B true CN1007089B (en) | 1990-03-07 |
Family
ID=4801547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86101904 Expired CN1007089B (en) | 1986-03-18 | 1986-03-18 | Intelligence frequency meter with high-resolution |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1007089B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108333425B (en) * | 2018-01-16 | 2024-03-29 | 南昌大学 | Digital frequency meter |
| 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 |
-
1986
- 1986-03-18 CN CN 86101904 patent/CN1007089B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN86101904A (en) | 1987-02-25 |
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