CN2480850Y - High-precision quick digital measurer for high-frequency unknown frequency sine wave vector - Google Patents
High-precision quick digital measurer for high-frequency unknown frequency sine wave vector Download PDFInfo
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- CN2480850Y CN2480850Y CN 01221243 CN01221243U CN2480850Y CN 2480850 Y CN2480850 Y CN 2480850Y CN 01221243 CN01221243 CN 01221243 CN 01221243 U CN01221243 U CN 01221243U CN 2480850 Y CN2480850 Y CN 2480850Y
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Abstract
The utility model belongs to the manufacturing of a high-precision quick digital measurer for high-frequency unknown frequency sine wave vector, consisting of a high-frequency sine wave input device, a high-frequency sine wave down converter, a high-frequency resolution, a low-phase noise PC local oscillation sweeper, an intermediate frequency filter, a PC amplifying/attenuating device, a PC sampling holder, a PC A/D converter, a high-speed digital processor and an output device. The down-convert realizes non-information distortion frequency spectrum convert; according to the principle that an unknown frequency sine wave curve absolutely can be defined by use of the known time interval and non-zero three points of the intermediate frequency during a period, the high-speed digital processor performs direct digital calculations of the A/D sample data, thereby completing the high-precision quick digital measurement for high-frequency unknown frequency sine wave vector. The utility model not only overcomes the defects of prior measurement plans, but also enhances measuring speed and precision.
Description
The utility model is the manufacturing that belongs to the sinusoidal wave vector high precision of high frequency unknown frequency fast digital measurement mechanism.
The sinusoidal wave vector high precision of China's high frequency unknown frequency fast digital measurement mechanism (microsecond level/point---as 50 μ s/ points; High_frequency sine wave relative amplitude measuring accuracy is higher than 0.5dB; High_frequency sine wave relative phase measuring accuracy is higher than 0.3 degree; High_frequency sine wave frequency measurement resolution is better than 1Hz) manufacturing still belong at present blank, the complete dependence on import of high_frequency sine wave vector high precision fast digital measurement mechanism.Existing domestic high_frequency sine wave vector is measured utility unit fast and still is in the analogue measurement technical merit, and measuring accuracy is low, as homemade radar, homemade high_frequency sine wave vector measurement instrument etc.; Low speed (Millisecond/every point, as the 500ms/ point) though the manufacturing technology of high_frequency sine wave vector high precision measuring device is domestic comparatively ripe, general high_frequency sine wave nominal peak amplitude measurement, the relatively independent measurement mechanism of relative initial phase measurement three covers with high_frequency sine wave of high_frequency sine wave frequency measurement of adopting respectively constituted, after adopting the physical quantity conversion equipment that high_frequency sine wave nominal peak amplitude, the relative initial phase with high_frequency sine wave of high_frequency sine wave frequency are carried out conversions such as frequency/time or voltage/current respectively in the realization, row is implemented to measure indirectly again.As high_frequency sine wave nominal peak amplitude indirect measurement system is had: sinusoidal wave real effective conversion or AC-DC conversion D.C. voltmeter measurement mechanism, peak-peak sampling keep D.C. voltmeter measurement mechanism etc.; The relative initial phase indirect measurement system of high_frequency sine wave is had: phase differential is filled numeration measurement mechanism, phase differential to phase discriminating pulse conversion low-pass filtering D.C. voltmeter measurement mechanism, multiplier phase demodulation low-pass filtering D.C. voltmeter measurement mechanism etc. to the phase discriminating pulse conversion; The high_frequency sine wave frequency measuring equipment is the most common to be that numeration measurement mechanism, f-V conversion dc voltage table measurement mechanism etc. are filled in frequency/time conversion.This type of existing high_frequency sine wave vector low-speed digital measurement mechanism, though can satisfy the requirement of measuring accuracy, its generally by two or three parts mutually independently metering circuit, instrument form, the cost height, power consumption is big, volume is big, connection is complicated; Speed obviously can not satisfy needs the occasion of measurement at a high speed.
The purpose of this utility model provides the sinusoidal wave vector high precision of a kind of new high frequency unknown frequency fast digital measurement mechanism, the utility model is changed the classical indirect digital measurement of high_frequency sine wave vector and is that high_frequency sine wave vector Direct Digital is measured, to be higher than 14, sampling rate is greater than the program control A/D converter of 100ksps, high frequency resolution (as smaller or equal to 1Hz) and low phase noise are (as making an uproar mutually less than-80dB) local oscillations frescan, (processing speed is higher than 50ns) digital signal processor (as DSP) guarantees high precision and measures fast at a high speed, measure with the high_frequency sine wave of given frequency and the amplitude intermediate-freuqncy signal after to tested unknown frequency high_frequency sine wave mixing down coversion realizing technical employing, promptly known interval in the intermediate-freuqncy signal sine wave period and are carried out the A/D sampling at non-vanishing 3, by high speed digital signal processor the A/D sampled data is carried out the high-speed figure computing, the disposable high_frequency sine wave nominal peak amplitude that directly obtains, the digitizing amount final argument of relative initial phase of high_frequency sine wave and high_frequency sine wave frequency, thus the quick high accuracy digital measurement of the sinusoidal wave vector of high frequency unknown frequency finished.Fundamentally solve the contradiction of measuring speed and measuring accuracy, under the situation of not sacrificing precision, improved measuring speed greatly, reduced the cost of high_frequency sine wave vector high precision fast digital measurement mechanism; Reduce volume and power consumption effectively, improved product maneuverability, dirigibility, consistance and reliability.
With reference to Figure of description: Fig. 1 is sinusoidal wave vector high precision fast digital measurement mechanism inner structure of high frequency unknown frequency and connection layout; Fig. 2 is that the sinusoidal wave vector high precision of high frequency unknown frequency fast digital is measured the if sampling oscillogram; Fig. 3 is the high-frequency vector lattice gauge inner structure and the outside survey sheet that is connected that the sinusoidal wave vector high precision of high frequency unknown frequency fast digital measurement mechanism is applied to measure frequency conversion network.
Now the utility model is described as follows: as shown in Figure 1, the sinusoidal wave vector high precision of high frequency unknown frequency fast digital measurement mechanism mainly comprises high_frequency sine wave input media 1, high_frequency sine wave low-converter 2, (frequency resolution is smaller or equal to 1Hz for the program control local oscillations frescan 3 of the high frequency resolution of given frequency and amplitude and low phase noise, make an uproar mutually less than-80dB), intermediate-frequency filter 4, program control amplification device 5, program control sampling holder 6, program control A/D converter 7 (as sampling precision more than or equal to 14 and sampling rate program control A/D) greater than 100ksps, (processing speed is higher than 50ns) digital signal processor 9 at a high speed, follower 18, control bus and data bus 8, C is an apparatus housing.A (t) is tested unknown frequency high frequency sinusoidal signal; C (t) is program control local oscillations sweep sine; A (t) is final tested intermediate-freuqncy signal.1---7 connect successively; 3 connect 2; 9 connect 18 and connect 3/5/6/7 respectively by 8.
As shown in Figure 1, its principle of work is mainly divided: the seizure of tested unknown frequency high frequency sinusoidal signal and measure two processes." seizure " promptly at first controlled 3 by 9 by 8 and carried out in effective band interscan search, and the duty of synchro control 5,6,7, to cooperate 3, obtains valid data output until 7 and finishes " seizure "; " measurement " is to import 4 by 1 and 3 c (t) at a (t) after 2 mixing, the useless clutter output of filtering intermediate-freuqncy signal, intermediate-freuqncy signal forms the final tested intermediate-freuqncy signal A (t) that are fit to 7 samplings after 5 amplifications or decay, provide accurate sampled value by 6 to 7, to eliminate the A/D transformed error, A (t) is carried out weekly the phase be no less than three known sampling time intervals and non-vanishing sampling, sampled data is directly carried out digital operation by 8 inputs 9 and is handled, and measurement result is by 18 outputs.The vector measurement mathematical model is set up as follows:
If tested unknown frequency high frequency sinusoidal signal is a (t), the output signal of the program control local oscillations frescan 3 of high frequency resolution low phase noise of given frequency and amplitude is c (t), sets forth principle legibly for simplifying, and establishing c (t) first phase and be 0 has so:
A (t)=Axsin (ω t+ θ x) (1) formula
C (t)=C
0Sin ω
0T (2) formula A road signal is output as through 1,2,4,5:
A (t)=0.5K C
0Axcos ((ω-ω
0) t+ θ x) and wherein K be 5 known programme-controlled gain, when establishing with K
0=0.5K C
0The time, obtain following tested intermediate-freuqncy signal:
A (t)=K
0Axcos ((ω-ω
0) t+ θ x) (3) formula
Continuous oscillogram is as shown in Figure 2 during the ADC sampling:
High-speed ADC is from t
1Constantly with Δ t
1, Δ t
2Known sampling time interval is to A (t) signal sampling.Wherein have:
Δt
1＝t
2－t
1 Δt
2＝t
3－t
2
Be similarly the simple declaration problem that is easy to, establish t here
1=0, Δ t
1=Δ t
2=Δ t has so:
t
2=Δ t
t3=2 Δ t has t=t1=0 substitution (3) formula:
A (0)=K
0Axcos θ x (4) formula
Wherein A (0) is ADC:7 at t
1Moment sampled value
In like manner have
A (Δ t)=K
0Axcos ((ω-ω
0) Δ t+ θ x) (5) formula
A (2 Δ t)=K
0Axcos (2 (ω-ω
0) Δ t+ θ x) (6) formula
A (Δ t wherein
1), A (Δ t
2) promptly be respectively ADC (being parts 7 among Fig. 1) at t
2, t
3Moment sampled value, finding the solution the equation with three unknowns group of being made up of (4) formula, (5) formula, (6) formula has:
Promptly obtained sinusoidal signal with respect to t=t to this
1The absolute prima facies place value in=0 moment.Ax=A (0)/(K
0Cos θ x) (8) formula can be obtained tested sinusoidal wave nominal peak range value to this.
ω=ω
0+ { arccos (A (Δ t) cos θ x/A (0)-θ x) }/Δ t (9) formula
Can obtain tested sinusoidal wave nominal angle frequency values to this.
So far, when finishing this mathematics model, also finished the once high precision fast digital measurement of (or a bit) of the sinusoidal wave vector of high frequency unknown frequency, other mathematical method modelings such as the also available function of a complex variable of this mathematical model, FFT repeat no more here certainly.
Inner each element of main circuit of the utility model is other circuit realization of available identical function also, as:
(1). 9 can have the circuit formation of identical function less than the combination of DSP, CPU, MCU, ASIC, FPGA, PLD, CPLD or the above device of 50ns with the minimum instruction cycle in the utility model, as long as computing velocity meets the overall design rate request and all can adopt.
(2). 3 can and improve the circuit that FNPLL etc. has identical function by DDS or the PLL that is made up of DDS, FNPLL and constitute in the utility model, all can adopt as long as high frequency resolution and phase noise satisfy general design requirement.
(3). 7 can be made of greater than A/D converter monolithic IC, the multi-disc IC of 100Ksps or discrete component etc. more than or equal to 14, switching rate precision in the utility model, as long as satisfy the utility model and general design requirement all can adopt.
(4). 18 can be made of CRT, LCD, light-emitting diode display or respective electrical magnetic recording, actuating unit etc. in the utility model, as long as satisfy the utility model and general design requirement all can adopt.
(5). 2,4,5,6 can use discrete component, monolithic IC, multi-disc IC or module in the utility model, as long as satisfy the utility model and general design requirement all can adopt.
Because of the measurement of the sinusoidal wave vector high precision of high frequency unknown frequency fast digital has been widely used in as radar, electronic component/high-precision pointed collar territories such as manufacture of materials test at current western developed country, so an invention has wide application and bigger practical technique value and economic worth.
The utility model is applied to measure the high-frequency vector lattice gauge of frequency conversion network, and homemade high-frequency vector lattice gauge is reached: 50 μ s/ points; High_frequency sine wave relative amplitude measuring accuracy is higher than 0.5dB; High_frequency sine wave relative phase measuring accuracy is higher than 0.3 degree; High_frequency sine wave frequency measurement resolution is better than the performance index of 1Hz.Its inner structure is connected survey sheet as shown in Figure 3 with outside: wherein 19 are tested network, adding heavy line is tested network 19 and high-frequency vector lattice gauge signal connecting line, all the other are high-frequency vector lattice gauge inner structure connection diagram, comprising: high_frequency sine wave input media 1 and 11, high_frequency sine wave low- converter 2 and 12, the program control local oscillations frescan 3 of high frequency resolution low phase noise and 13, intermediate- frequency filter 4 and 14, program control amplification device 5 and 15, program control sampling holder 6 and 16, sampling precision is more than or equal to 14 and the sampling rate A/ D converter 7 and 17 greater than 100ksps, processing speed is higher than the high speed digital signal processor 9 of 50ns, follower 18, control bus and data bus 8, high_frequency sine wave swept signal source 20; K is the high frequency single-pole double-throw switch (SPDT) by 9 controls; D is for measuring the high-frequency vector lattice gauge cabinet of frequency conversion network.Wherein 1---7 connect successively, form high-frequency vector lattice gauge reference measure passage A; 3 connect 2 respectively, the m position of K; 11---17 connect successively, form the high-frequency vector lattice gauge and measure channel B; 13 connect the n position of K, and 9 connect 18 and connect 3,5,6,7,13,15,16,17,20 and the control end (dotted line among the figure) of K respectively by 8; 19 connect 11,20 respectively when testing outside 19.
This high-frequency vector lattice gauge principle of work is sketched in following: 9 control K are in the m position under the general measure occasion, and A, B passage provide the local oscillations swept-frequency signal by 3.Provide frequency sweep high_frequency sine wave signal by 20, one the tunnel directly enters 1, lead up to and 19 enter 11, because of 20 frequencies are the numerical control given frequency, can do corresponding simplification so measure mathematical model, under A, B two-way synchronized sampling situation, can finish the accurately relative or absolute vectors of non-frequency network and measure, measure flow process and no longer describe in detail here.When tested network 19 is frequency conversion network, because of B passage in whole effective band and instrument dynamic range does not have effective output signal all the time, be that the B passage is in the sinusoidal wave vector measurement state of unknown frequency, switch on the n position so control K automatically by 9, be A, the B two-way is respectively by program control local oscillations frescan 3 separately, 13 provide the local oscillations swept-frequency signal, when 9 controls 3 and 20 are in the built-in oscillation frequency, the effective intermediate frequency output in A road, and make 9 control 13 frequency sweep work in full effective band carry out " seizure " simultaneously, thereby carry out the process of the utility model measurement, when 3 with after 20 cooperate pointwise to repeat above-mentioned measuring process with the certain frequency stepping with the B passage, must obtain the vectorial property of frequency conversion network 19 in the effective band that we are concerned about, thereby the high-frequency vector of finishing frequency conversion network is measured.Certainly in the practical application, because of frequency conversion network generally comparatively simple, as frequency mixer, N frequency divider/frequency multiplier etc., be not difficult in two to three times are measured, to find out the corresponding relation of the parameters such as frequency, frequency step on B road and A road, thereby automatically generate next and the 3 frequency sweep frequencies that are complementary by 9 controls 13,, improve measuring speed to save in each measuring process sweep time of 13, because the method can be realized easily by software, also no longer too much relate to here.
This shows, the utility model is applied to the high-frequency vector lattice gauge can very convenient, automatically measure frequency conversion network, and need not beyond the high-frequency vector lattice gauge, to add any measurement annex and artificial the interference, when obtaining each parameter of vector network fast, not only guaranteed measuring accuracy, and reduced the measurement difficulty, improved measuring speed greatly.
Claims (6)
1. the sinusoidal wave vector high precision of high frequency unknown frequency fast digital measurement mechanism, it is characterized in that it mainly comprises the high_frequency sine wave input media, the high_frequency sine wave low-converter, the program control local oscillations frescan of the high frequency resolution of given frequency and amplitude and low phase noise, intermediate-frequency filter, program control amplification device, program control sampling holder, program control A/D converter, high speed digital signal processor, follower and control bus and data bus constitute, and the high_frequency sine wave low-converter connects the high_frequency sine wave input media respectively, the program control local oscillations frescan of the high frequency resolution of given frequency and amplitude and low phase noise, intermediate-frequency filter; Intermediate-frequency filter connects program control amplification device; Program control amplification device connects program control sampling holder; Program control sampling holder connects program control A/D converter; High speed digital signal processor is connected given frequency and amplitude respectively by control bus and data bus high frequency resolution and the program control local oscillator of low phase noise, program control amplification device, program control sampling holder, program control A/D converter also are connected with follower; Realize no information distortion frequency spectrum shift with down coversion, carry out data sampling by program control A/D converter centering frequency sine-wave, with high speed numerical processor the A/D sampled data being carried out Direct Digital calculates, the digitizing amount of the disposable nominal peak amplitude that obtains high frequency unknown frequency sine wave, frequency and relative initial phase, thus the fast digital of finishing the sinusoidal wave vector of high frequency unknown frequency is measured.
2. according to the sinusoidal wave vector high precision of the said unknown frequency of claim 1 fast digital measurement mechanism, it is characterized in that the circuit that PLL, FNPLL that said high frequency resolution and low phase noise local oscillations frescan are formed by DDS, by DDS or improvement FNPLL etc. have an identical function constitutes.
3. according to the sinusoidal wave vector high precision of the said unknown frequency of claim 1 fast digital measurement mechanism, it is characterized in that said program control A/D converter is greater than 100Ksps and more than or equal to 14 the monolithic a/d converter IC or the program control A/D converter of formations such as multi-disc A/D converter IC or discrete component.
4. according to the sinusoidal wave vector high precision of the said unknown frequency of claim 1 fast digital measurement mechanism, it is characterized in that the said high speed digital signal processor circuit that to be the minimum instruction cycle have an identical function less than DSP, the CPU of 50ns, MCU, ASIC, FPGA, PLD, CPLD etc. or above combination of devices constitutes.
5. according to the sinusoidal wave vector high precision of the said unknown frequency of claim 1 fast digital measurement mechanism, it is characterized in that said follower is CRT, LCD, light-emitting diode display or respective electrical magnetic recording, actuating unit.
6. according to the sinusoidal wave vector high precision of the said unknown frequency of claim 1 fast digital measurement mechanism, it is characterized in that said high_frequency sine wave low-converter, intermediate-frequency filter, program control amplification device, program control sampling holder, be to constitute respectively by monolithic IC, module or same functional circuits such as multi-disc IC, module or discrete component.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01221243 CN2480850Y (en) | 2001-04-17 | 2001-04-17 | High-precision quick digital measurer for high-frequency unknown frequency sine wave vector |
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| CN 01221243 CN2480850Y (en) | 2001-04-17 | 2001-04-17 | High-precision quick digital measurer for high-frequency unknown frequency sine wave vector |
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| CN2480850Y true CN2480850Y (en) | 2002-03-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008034306A1 (en) * | 2006-09-18 | 2008-03-27 | Jiajing Zang | A digital multimeter with automatic measurement selection function |
| CN101212212B (en) * | 2006-12-30 | 2011-06-22 | 凌阳科技股份有限公司 | High precision oscillator with self-calibration function and calibration method |
| CN102749509A (en) * | 2012-07-26 | 2012-10-24 | 上海宏力半导体制造有限公司 | Signal sampling test method |
-
2001
- 2001-04-17 CN CN 01221243 patent/CN2480850Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008034306A1 (en) * | 2006-09-18 | 2008-03-27 | Jiajing Zang | A digital multimeter with automatic measurement selection function |
| CN101212212B (en) * | 2006-12-30 | 2011-06-22 | 凌阳科技股份有限公司 | High precision oscillator with self-calibration function and calibration method |
| CN102749509A (en) * | 2012-07-26 | 2012-10-24 | 上海宏力半导体制造有限公司 | Signal sampling test method |
| CN102749509B (en) * | 2012-07-26 | 2016-08-31 | 上海华虹宏力半导体制造有限公司 | Signal sampling method of testing |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |