CN102901876A - Method for measuring inter-modulation spectral lines by using network analyzer based on multi-voice excited step recovery diode (SRD) pulse generator - Google Patents
Method for measuring inter-modulation spectral lines by using network analyzer based on multi-voice excited step recovery diode (SRD) pulse generator Download PDFInfo
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Abstract
The invention discloses a method for measuring inter-modulation spectral lines by using a network analyzer based on a multi-voice excited step recovery diode (SRD) pulse generator and relates to a method for measuring inter-modulation spectral lines. The method solves the problem that the harmonic phase reference of the conventional single-voice excited SRD pulse generator cannot provide the inter-modulation spectral lines with controllable quantity and resolution nearby each sub-harmonic frequency point. The signal output end of the SRD-based pulse generator is connected with the phase reference signal input end of the nonlinear vector network analyzer (NVNA); the excitation signal input end of the SRD-based pulse generator is connected with the excitation signal output end of a multi-voice excitation signal generator; and the output provided with a vector signal generator is used as excitation of the SRD-based pulse generator, n-voice modulation signals to be detected are input to a measurement port, phase reference signals are added to all measurement frequency points, meanwhile, continuous and stable detected spectral lines are provided, and thus an effective measurement value of a detected channel phase spectrum is obtained. The method is used for measuring the inter-modulation spectral lines.
Description
Technical field
The present invention relates to a kind of measuring method of intermodulation spectral line.
Background technology
It is non-linear that the pulse train of exporting under sine-wave excitation based on the step-recovery diode (SRD) pulse producer has significant frequency domain harmonic wave, can be the nonlinear network measuring tables such as non-linear vector network analyzer (NVNA, Nonlinear Vector Network Analyzer) and LSNA effective harmonic phase reference signal is provided.Based on step-recovery diode (SRD) (SRD, Step Recovery Diode)) conventional phase of pulse producer is with reference to the harmonic mode that all is operated under the single-tone sinusoidal excitation, when guaranteeing effective harmonic wave bandwidth, can't provide meticulous spectral resolution, only can realize the phase measurement to the broadband harmonic signal, can't satisfy the phase test demand to narrow-band modulated.
So far, all phase reference designs all are based on the harmonic wave scheme, all be faced with " contradiction between bandwidth and the resolution " that caused by " the highest overtone order that utilizes " in the harmonic wave mode, namely in the situation of determining bandwidth, can not ad infinitum improve spectral resolution.Be subject to the restriction of SRD physical characteristics based on the spectral resolution of the harmonic phase reference of the SRD pulse producer of single-tone excitation, on the one hand, the frequency of single-tone pumping signal need to be controlled at the desirable step recovery effects of certain limit guarantee.On the other hand, the upper limit of exciting power has determined the maximal value of each harmonic component, has been equivalent to limit the higher harmonics number of times and the bandwidth that can be that NVNA utilizes.Therefore, for spectral line frequency be spaced apart below the MHz, carrier wave and harmonic frequency thereof be in the measurement of hundred MHz even the complex modulated signal more than the GHz, NVNA harmonic phase reference based on SRD is difficult to reach requirement, and all controllable intermodulation spectral lines of quantity and resolution can't be provided near the each harmonic frequency.
Summary of the invention
The present invention can't provide all problems of controllable intermodulation spectral line of quantity and resolution in order to solve the harmonic phase reference that has the SRD pulse producer that encourages based on single-tone now near the each harmonic frequency.And the network analyzer based on multitone excitation step-recovery diode (SRD) pulse producer that provides is measured the method for intermodulation spectral line.
Encourage the network analyzer of step-recovery diode (SRD) pulse producer to measure the method for intermodulation spectral line based on multitone, the specific implementation step of described measuring method is:
Step 1, link to each other with the phase reference signal input end of non-linear vector network analyzer based on the signal output part of the pulse producer of step-recovery diode (SRD);
Step 2, link to each other with the pumping signal output terminal of multitone excitation signal generator based on the pumping signal input end of the pulse producer of step-recovery diode (SRD);
Step 3, the sound that the excitation of multitone in the multitone excitation signal generator is set are counted n, centre frequency f and frequency interval Δ f, described centre frequency is set to the integral multiple of f, the integral multiple that frequency interval is Δ f is set, according to the size of the required resolution of required measuring-signal frequency interval is set;
Step 4, unlatching multitone excitation signal generator, the sinusoidal carrier cycle that is in the envelope diverse location at the pulse producer based on step-recovery diode (SRD) all generates a burst pulse corresponding with current amplitude, all burst pulse periodic arrangement together, possessed different spectrum components, realized the concentration of local of energy in time domain, on frequency domain, then finish the transfer of energy from the first-harmonic to the each harmonic, and then obtained harmonic wave, intermodulation spectral line;
Step 5, according to the measurement frequency of the setup of attribute nonlinear networksanalysis instrument of required measuring-signal, i.e. the ÷ 2 * step frequency of initial frequency fstart=centre frequency-(n-1) stops the ÷ 2 * step frequency of frequency f stop=centre frequency+(n-1); N is the modulation signal of n sound;
Step 6, carry out instrument calibration according to the calibration guide based on the step-recovery diode (SRD) pulse producer;
Step 7, with the signal measurement port of the n tone of required measuring-signal signal processed input nonlinear networksanalysis instrument, while is transferred to the phase reference signal input end of nonlinear networksanalysis instrument based on the signal of the pulse producer generation of step-recovery diode (SRD), being added in all and measuring the intermodulation spectral line that continous-stable is provided on frequencies simultaneously of phase reference signal, described intermodulation spectral line does not change the interference that more is not subjected to the local oscillator phase place in time with the difference of measuring the channel phases spectrum;
Step 8, by after the phase reference signal phase place is compensated in the lump together with channel delay, obtain effective measured value of tested channel phases spectrum.
The method of measurement intermodulation spectral line of the present invention can provide all controllable intermodulation spectral lines of quantity and resolution near the each harmonic frequency.Realized the concentration of local of energy on frequency domain, then being equivalent to finish the transfer of energy from the first-harmonic to the each harmonic in time domain based on the pulse producer of step-recovery diode (SRD), major embodiment the harmonic wave non-linear behavior.And by Fig. 1, Fig. 2 contrast as can be known, encourage the pulse producer of the recovery diode that jumps further to develop its intermodulation characteristic with multitone, abundant high resolving power spectral line is provided near each harmonic, raising along with overtone order, near the centre frequency spectral line quantity can increase gradually, and then solved the phase test demand of nonlinear networksanalysis instrument narrow-band modulated and in the problem of determining ad infinitum to improve in the situation of bandwidth spectral resolution, improved the measurement function of nonlinear networksanalysis instrument to complex modulated signal.
Description of drawings
Fig. 1 is the Frequency and Amplitude waveform of the input and output of pulse producer single-tone excitation;
Fig. 2 is the Frequency and Amplitude waveform of the pulse producer input and output under the multitone excitation;
Time domain waveform test design sketch under Fig. 3 10MHz resolution arranges;
Time domain waveform test result design sketch under Fig. 4 1MHz resolution arranges;
Fig. 5 is 799MHz, 800MHz, the first-harmonic intermodulation spectral line under the excitation of 801MHz three sounds;
Fig. 6 is 799MHz, 800MHz, the second harmonic spectral line under the excitation of 801MHz three sounds;
Fig. 7 is 799MHz, 800MHz, the third harmonic spectral line under the excitation of 801MHz three sounds.
Embodiment
Embodiment one, the described network analyzer based on multitone excitation step-recovery diode (SRD) pulse producer of present embodiment are measured the method for intermodulation spectral line, and the specific implementation step of described measuring method is:
Step 1, link to each other with the phase reference signal input end of non-linear vector network analyzer based on the signal output part of the pulse producer of step-recovery diode (SRD);
Step 2, link to each other with the pumping signal output terminal of multitone excitation signal generator based on the pumping signal input end of the pulse producer of step-recovery diode (SRD);
Step 3, the sound that the excitation of multitone in the multitone excitation signal generator is set are counted n, centre frequency f and frequency interval Δ f, described centre frequency is set to the integral multiple of f, the integral multiple that frequency interval is Δ f is set, according to the size of the required resolution of required measuring-signal frequency interval is set;
Step 4, unlatching multitone excitation signal generator, the sinusoidal carrier cycle that is in the envelope diverse location at the pulse producer based on step-recovery diode (SRD) all generates a burst pulse corresponding with current amplitude, all burst pulse periodic arrangement together, possessed different spectrum components, realized the concentration of local of energy in time domain, on frequency domain, then finish the transfer of energy from the first-harmonic to the each harmonic, and then obtained harmonic wave, intermodulation spectral line;
Step 5, according to the measurement frequency of the setup of attribute nonlinear networksanalysis instrument of required measuring-signal, i.e. the ÷ 2 * step frequency of initial frequency fstart=centre frequency-(n-1) stops the ÷ 2 * step frequency of frequency f stop=centre frequency+(n-1); N is the modulation signal of n sound;
Step 6, carry out instrument calibration according to the calibration guide based on the step-recovery diode (SRD) pulse producer;
Step 7, with the signal measurement port of the n tone of required measuring-signal signal processed input nonlinear networksanalysis instrument, while is transferred to the phase reference signal input end of nonlinear networksanalysis instrument based on the signal of the pulse producer generation of step-recovery diode (SRD), being added in all and measuring the intermodulation spectral line that continous-stable is provided on frequencies simultaneously of phase reference signal, described intermodulation spectral line does not change the interference that more is not subjected to the local oscillator phase place in time with the difference of measuring the channel phases spectrum;
Step 8, by after the phase reference signal phase place is compensated in the lump together with channel delay, obtain effective measured value of tested channel phases spectrum.
Embodiment two, present embodiment are the further specifying of method of the described network analyzer based on multitone excitation step-recovery diode (SRD) pulse producer of implementation one being measured the intermodulation spectral line, measure the modulation signal of 17 sounds at non-linear vector network analyzer, described centre frequency is 5GHz, and frequency interval is 40kHz.The step of measuring is as follows:
Step 1, link to each other with the phase reference signal input end of non-linear vector network analyzer based on the signal output part of the pulse producer of step-recovery diode (SRD);
Step 2, link to each other with the pumping signal output terminal of multitone excitation signal generator based on the pumping signal input end of the pulse producer of step-recovery diode (SRD);
Step 3, the sound that the excitation of multitone in the multitone excitation signal generator is set are counted n, centre frequency f and frequency interval Δ f, described centre frequency is set to the integral multiple of f, the integral multiple that frequency interval is Δ f is set, according to the size of the required resolution of required measuring-signal frequency interval is set; Need to guarantee that 5GHz is the integral multiple of f, 40kHz is the integral multiple of Δ f.Such as n=3, f=1GHz, Δ f=10kHz, or n=5, f=500MHz, Δ f=40kHz;
Step 4, unlatching multitone excitation signal generator, the sinusoidal carrier cycle that is in the envelope diverse location at the pulse producer based on step-recovery diode (SRD) all generates a burst pulse corresponding with current amplitude, all burst pulse periodic arrangement together, possessed different spectrum components, realized the concentration of local of energy in time domain, on frequency domain, then finish the transfer of energy from the first-harmonic to the each harmonic, and then obtained harmonic wave, intermodulation spectral line; Step 5, according to the measurement frequency of the setup of attribute nonlinear networksanalysis instrument of required measuring-signal, i.e. the ÷ 2 * step frequency of initial frequency fstart=centre frequency-(n-1) stops the ÷ 2 * step frequency of frequency f stop=centre frequency+(n-1); N is the modulation signal of n sound; Be initial frequency f
Start=5GHz-(17-1) ÷ 2 * 40kHz=4.999680GHz stops frequency f
Stop=5GHz+ (17-1) ÷ 2 * 40kHz=5.000320GHz, stepping f
Step=40kHz;
Step 6, carry out instrument calibration according to the calibration guide based on the step-recovery diode (SRD) pulse producer;
Step 7, with the signal measurement port of the n tone of required measuring-signal signal processed input nonlinear networksanalysis instrument, while is transferred to the phase reference signal input end of nonlinear networksanalysis instrument based on the signal of the pulse producer generation of step-recovery diode (SRD), being added in all and measuring the intermodulation spectral line that continous-stable is provided on frequencies simultaneously of phase reference signal, described intermodulation spectral line does not change the interference that more is not subjected to the local oscillator phase place in time with the difference of measuring the channel phases spectrum;
Step 8, by after the phase reference signal phase place is compensated in the lump together with channel delay, obtain effective measured value of tested channel phases spectrum.
Be 1MHz to resolution respectively according to above-mentioned set-up mode, the waveform of 10MHz frequency is tested, and is such as Fig. 3, shown in Figure 4; In the higher part of input envelope amplitude, SRD has the pulse generate effect with single tone sine wave excitation down, and the amplitude of pulse is relevant with current instantaneous exciting power; Along with the input envelope amplitude reduces, when less than the SRD pulse generation exciting power being required, the pulsatile effect of the output waveform of phase reference weakens, and becomes gradually the sine wave that becomes envelope; And draw 1MHz resolution by the test result of Fig. 5, Fig. 6, Fig. 7 and arrange down, three sounds excitation corresponding phase is with reference near the output power spectrum the harmonic wave frequency.Because the dynamic range of NVNA is extremely wide, reaches 85dB even surpass 100dB; Along with the increase of excitation sound number, near the power spectral line the each harmonic centre frequency can be more smooth, and the decline effect also weakens thereupon, is equivalent to provide more preferably phase reference spectral line.Simultaneously, the resolution of 1KHz neither be tested the limit of the phase reference of employing, and it can be operated in below the frequency interval of 100Hz at least.This performance is to guarantee that current all harmonic phase reference schemes all can't be realized under a few GHz harmonic wave bandwidth prerequisites.In order to check the phase measurement index of intermodulation spectral line, adopt the three sounds excitation SRD pulse producer of 10KHz resolution as phase reference at the NVNA prototype machine, tested second nine tone signal (10KHz frequency interval that vector signal generator generates, inswept each harmonic wave frequency successively) result such as the table 1 of 10 duplicate measurementss, table 2, table 3.
Near (the unit: degree) of the phase result of the duplicate measurements table 1 800MHz first-harmonic
Near (the unit: degree) of the phase result of the duplicate measurements table 2 800MHz third harmonic
Near (the unit: degree) of the phase result of duplicate measurements table 3 800MHz ten subharmonic
Table 1, table 2, table 3 shows; In the situation of introducing signal source and receiver noise, near the phase measurement random uncertainty of this test condition each harmonic frequency is generally less than 0.3 °, low frequency part even generally be lower than 0.1 °, only reach the highest 0.76 ° at indivedual frequencies, can satisfy the NVNA prototype machine to the index request of phase measurement accuracy.
Claims (1)
1. measure the method for intermodulation spectral line based on the network analyzer of multitone excitation step-recovery diode (SRD) pulse producer, it is characterized in that the specific implementation step of described measuring method is:
Step 1, link to each other with the phase reference signal input end of non-linear vector network analyzer based on the signal output part of the pulse producer of step-recovery diode (SRD);
Step 2, link to each other with the pumping signal output terminal of multitone excitation signal generator based on the pumping signal input end of the pulse producer of step-recovery diode (SRD);
Step 3, the sound that the excitation of multitone in the multitone excitation signal generator is set are counted n, centre frequency f and frequency interval Δ f, described centre frequency is set to the integral multiple of f, and the integral multiple that frequency interval is Δ f is set, and according to the size of the required resolution of required measuring-signal frequency interval is set;
Step 4, unlatching multitone excitation signal generator, the sinusoidal carrier cycle that is in the envelope diverse location at the pulse producer based on step-recovery diode (SRD) all generates a burst pulse corresponding with current amplitude, all burst pulse periodic arrangement together, possessed different spectrum components, realized the concentration of local of energy in time domain, on frequency domain, then finish the transfer of energy from the first-harmonic to the each harmonic, and then obtained harmonic wave, intermodulation spectral line;
Step 5, according to the measurement frequency of the setup of attribute nonlinear networksanalysis instrument of required measuring-signal, i.e. the ÷ 2 * step frequency of initial frequency fstart=centre frequency-(n-1) stops the ÷ 2 * step frequency of frequency f stop=centre frequency+(n-1); N is the modulation signal of n sound;
Step 6, carry out instrument calibration according to the calibration guide based on the step-recovery diode (SRD) pulse producer;
Step 7, with the signal measurement port of the n tone of required measuring-signal signal processed input nonlinear networksanalysis instrument, while is transferred to the phase reference signal input end of nonlinear networksanalysis instrument based on the signal of the pulse producer generation of step-recovery diode (SRD), being added in all and measuring the intermodulation spectral line that continous-stable is provided on frequencies simultaneously of phase reference signal, described intermodulation spectral line does not change the interference that more is not subjected to the local oscillator phase place in time with the difference of measuring the channel phases spectrum;
Step 8, by after the phase reference signal phase place is compensated in the lump together with channel delay, obtain effective measured value of tested channel phases spectrum.
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| CN103913633A (en) * | 2014-04-25 | 2014-07-09 | 中国计量科学研究院 | High-spectrum-resolution phase spectrum measuring device and method based on multi-frequency sinusoidal signals |
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| CN109254209A (en) * | 2017-07-12 | 2019-01-22 | 罗德施瓦兹两合股份有限公司 | comb signal generator, measuring device and method |
| CN107884621A (en) * | 2017-10-11 | 2018-04-06 | 中国计量科学研究院 | The non-linear vector network analyzer measuring method and device of quarter-phase reference |
| CN107884621B (en) * | 2017-10-11 | 2019-11-22 | 中国计量科学研究院 | The non-linear vector network analyzer measurement method and device of quarter-phase reference |
| US10693569B1 (en) | 2019-03-08 | 2020-06-23 | Rohde & Schwarz Gmbh & Co. Kg | Method of providing a phase reference, method for establishing known phase relationships as well as phase reference system |
| CN110231552A (en) * | 2019-07-08 | 2019-09-13 | 冯琛 | Coal mine cable insulating monitoring selection method, injection circuit and related device |
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