WO2007013302A1 - 周波数成分測定装置 - Google Patents
周波数成分測定装置 Download PDFInfo
- Publication number
- WO2007013302A1 WO2007013302A1 PCT/JP2006/313834 JP2006313834W WO2007013302A1 WO 2007013302 A1 WO2007013302 A1 WO 2007013302A1 JP 2006313834 W JP2006313834 W JP 2006313834W WO 2007013302 A1 WO2007013302 A1 WO 2007013302A1
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- WO
- WIPO (PCT)
- Prior art keywords
- frequency
- signal
- frequency component
- frequency conversion
- output
- Prior art date
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/173—Wobbulating devices similar to swept panoramic receivers
Definitions
- the present invention relates to a frequency component measuring apparatus for measuring a frequency component of an input signal in a spectrum analyzer or the like.
- Patent Document 2 Conventionally, using a method of removing an image by performing three-stage frequency conversion in a spectrum analyzer (see, for example, Patent Document 1) and a result of performing multiple frequency sweep operations. A technique for performing image removal (see, for example, Patent Document 2) is known.
- Patent Document 1 Japanese Unexamined Patent Publication No. 2000-329806 (Page 2-4, Figure 1-4)
- Patent Document 2 Pamphlet of International Publication No. 02Z29426 (Page 10-23, Fig. 7-22) Disclosure of Invention
- Patent Document 1 requires three mixers and a bandpass filter inserted between these three mixers in order to perform three-stage frequency conversion, resulting in a complicated configuration. Then there was a problem.
- Patent Document 2 has a problem that the frequency component measurement time is increased correspondingly because multiple frequency sweeps are required. For example, considering the case where two frequency sweeps are performed, the same signal needs to be input in the first frequency sweep and the second frequency sweep. There was a problem that the measurement could not be performed and the measurement accuracy was lowered.
- the present invention was created in view of these points, and an object of the present invention is to provide a frequency component measuring apparatus capable of simplifying the configuration, shortening measurement time, and improving measurement accuracy. It is in this.
- the frequency component measurement apparatus of the present invention is a measurement object.
- Frequency components based on a plurality of frequency conversion means for performing frequency conversion on the signal under measurement and signals after frequency conversion is performed by each of the plurality of frequency conversion means.
- Signal processing means for performing extraction and image removal. Based on the result of performing multiple frequency conversions in parallel on a common signal under measurement! / To perform frequency component extraction and image removal, so there are 3 stages or more as before
- the configuration can be simplified compared to the case where the frequency conversion is repeatedly performed by the configuration of cascade connection.
- by performing multiple frequency conversions in parallel on the common signal under measurement it is not necessary to repeat multiple frequency sweeps, thus reducing the measurement time and changing the frequency component of the signal under measurement.
- the measurement accuracy can be improved because it is not affected by this.
- the frequency conversion means described above extracts a predetermined frequency component from the mixer that mixes the signal under measurement and the local oscillation signal, the local oscillator that generates the local oscillation signal, and the output signal of the mixer. It is desirable that the pass center frequency of the band pass filter is different for each of the plurality of frequency conversion means. As a result, the frequency of the image generated in each of a plurality of frequency conversion operations can be made different, so that it is possible to identify the true frequency component force image to be detected, and frequency component extraction and image removal can be performed. It can be done reliably.
- the signal processing means described above is a true frequency component included in the signal under measurement when the output levels of a plurality of bandpass filters corresponding to each of the plurality of frequency conversion means simultaneously exceed a predetermined value. It is desirable to determine as an image when the output level of only one of the plurality of bandpass filters exceeds a predetermined value. This makes it possible to easily extract frequency components and remove images based on the output levels of a plurality of bandpass filters.
- a plurality of one frequency separated from the frequency of the local oscillation signal output from the local oscillator by the pass center frequency of the bandpass filter are plural. It is desirable to match the frequency conversion means. As a result, it is possible to match the frequency of the measurement target set corresponding to each of the plurality of frequency conversion means, so the influence of fluctuations in the frequency component can be avoided. It can be completely removed, and the measurement accuracy can be improved.
- a display device that displays the relationship between the frequency and the signal level of the frequency component for the frequency range swept by the frequency sweeping unit.
- the bandpass filter described above is realized by a digital filter.
- a digital filter it is easier to change the pass center frequency, bandwidth, etc., compared to the case of using an analog filter, so that measurement that meets user requirements is possible.
- an analog-digital converter that converts an analog signal obtained corresponding to each of the plurality of frequency conversion means described above into digital data is further provided, and the signal processing means outputs from the analog-digital converter. It is desirable to perform frequency component extraction and image removal by arithmetic processing using digital data. In particular, it is desirable that the bandpass filter is realized by arithmetic processing by a signal processing means. This makes it possible to more easily realize a band-pass filter having an arbitrary characteristic.
- FIG. 1 is a diagram illustrating a configuration of a spectrum analyzer according to an embodiment.
- FIG. 2 is an explanatory diagram showing the relationship between the frequency of the local oscillation signal and the detectable frequency of the detected signal in the present embodiment.
- FIG. 3 is a flowchart showing an operation procedure of the spectrum analyzer of the present embodiment for measuring signal components in a predetermined frequency range while performing image removal.
- FIG. 5 is an explanatory diagram of a modification showing the relationship between the frequency of the local oscillation signal and the frequency of the detected signal that can be detected.
- FIG. 6 is an explanatory diagram of a modification showing the relationship between the frequency of the local oscillation signal and the frequency of the detectable signal that can be detected.
- FIG. 1 is a diagram illustrating a configuration of a spectrum analyzer according to an embodiment.
- the spectrum analyzer of this embodiment consists of mixers 10, 20, local oscillators 12, 22, LPF (low-pass filter) 14, 24, analog-to-digital converter (ADC) 16, 26, PLL Circuits 18 and 28, a signal processing unit 40, and a display device 50 are provided.
- LPF low-pass filter
- ADC analog-to-digital converter
- the mixer 10 has one input terminal connected to the signal input terminal IN and the other input terminal connected to the output terminal of the local oscillator 12, and the signal under test RFin input via the signal input terminal IN. And the local oscillation signal Lo output from the local oscillator 12
- the frequency of 1 is mixed and the intermediate frequency signal IF is output.
- the output signal of mixer 10 is It is input to the analog / digital converter 16 through the filter 14.
- Mouth-pass filter 14 is for removing aliasing distortion that occurs in the sampling process of the analog-digital converter 16, and a component that is lower than a predetermined cut-off frequency lower than 1Z2 of the sampling frequency in this sampling process. Only pass through.
- the analog-to-digital converter 16 converts the intermediate frequency signal IF after passing through the low-pass filter 14 to digital
- the mixer 20 the one input terminal to the signal input terminal IN, the other input terminal is connected to the output terminal of the local oscillator 22, is inputted through the signal input terminal IN
- the intermediate frequency signal IF is output by mixing the frequency of the measurement signal RFin and the local oscillation signal Lo output from the local oscillator 22.
- the output signal of mixer 20 is
- the analog-to-digital converter 26 is input through the low-pass filter 24.
- the low-pass filter 24 is for removing aliasing distortion that occurs in the sampling process of the analog-digital converter 26, and only passes components that are lower than the predetermined cutoff frequency lower than 1Z2 of the sampling frequency in this sampling process. Let The analog-to-digital converter 26 converts the intermediate frequency signal IF after passing through the low-pass filter 24 into digital intermediate frequency data D.
- the local oscillator 12 generates a local oscillation signal Lo to be input to one mixer 10.
- the A PLL (phase lock loop) circuit 18 controls the oscillation frequency of the local oscillator 12 to a predetermined value.
- the PLL circuit 18 includes a phase comparator (PD) 18A, a low-pass filter (LPF) 18B, and a variable frequency divider 18C.
- the phase comparator 18A is a signal obtained by dividing the local oscillation signal Lo output from the local oscillator 12 by the variable frequency divider 18C and a reference.
- This pulse is smoothed by the low-pass filter 18B to generate a control voltage VI, which is applied to the local oscillator 12 as a voltage controlled oscillator.
- the variable divider 18C can change the division ratio N1, and the phase of the local oscillation signal Lo is divided by the division ratio N1.
- the local oscillator 22 receives a local oscillation signal Lo input to the other mixer 20.
- the PLL circuit 28 controls the oscillation frequency of the local oscillator 22 to a predetermined value.
- the PLL circuit 28 includes a phase comparator (PD) 28A, a low-pass filter (LPF) 28B, and a variable frequency divider 28C.
- the phase comparator 28A includes a signal obtained by dividing the local oscillation signal Lo output from the local oscillator 22 by the variable frequency divider 28C, a reference frequency signal, and the like.
- a pulse with a duty corresponding to the comparison result is output.
- This pulse is smoothed by the low-pass filter 28B to generate a control voltage V2, which is applied to the local oscillator 22 as a voltage-controlled oscillator.
- the variable divider 28C can change the division ratio N2, and the local oscillation signal Lo is divided by the division ratio N2 and input to the phase comparator 28A.
- the signal processing unit 40 is configured by, for example, a DSP (digital signal processing device), and receives two kinds of intermediate frequency data D 1 and D 2 input from two analog / digital converters 16 and 26, respectively. Use the frequency of the detected signal RFin while removing the image
- This signal processing unit 40 passes a specific frequency band component to the intermediate frequency data D input from one of the analog-digital converters 16 and passes it through.
- band pass filters 42 and 44 are digital filters realized by digital arithmetic processing, and can adjust the pass bandwidth and the pass center frequency within a predetermined range. Further, the signal processing unit 40 simultaneously changes the frequency division ratio N1 of the variable frequency divider 18C in the PLL circuit 18 and the frequency division ratio N2 of the variable frequency divider 28C in the PLL circuit 28 to Frequency sweep control that increases or decreases the frequency of local oscillation signals Lo and Lo output from each of the two local oscillators 12 and 22
- the display device 50 displays the detection result of the frequency component of the detected signal RFin detected by the signal processing unit 40. For example, a display in which the horizontal axis indicates the frequency and the vertical axis indicates the signal level for each frequency component is performed.
- FIG. 2 is a diagram showing the relationship between the frequency of the local oscillation signal and the frequency of the detectable signal RFin that can be detected in the present embodiment.
- Figures 2 (A) and (B) show the relationship corresponding to the combination of one mixer 10 and low-power oscillator 12
- Figures 2 (C) and (D) show the other mixer 20 and local oscillator 22 The relations corresponding to the combinations are shown.
- the pass center frequency of the bandpass filter 42 in the signal processing unit 40 corresponding to these is set to f.
- the frequency f is lower than the frequency f of the local oscillation signal Lo output from the local oscillator 12.
- the signal component SA with a frequency lower by 1 to 1 IF1 is detected (Fig. 2 (A)).
- the signal component SB having a frequency higher by f than the frequency f of the local oscillation signal Lo is simultaneously detected.
- the pass center frequency of the bandpass filter 44 in the signal processing unit 40 corresponding to these is set to f.
- image removal is performed by matching the frequencies of the signal component SA shown in FIG. 2 (A) and the signal component SC shown in FIG. 2 (C). That is, when the output of the bandpass filter 42 in the signal processing unit 40 has a certain level, this cause is detected! / There are two possible cases: the true signal component SA exists and the image signal component SB exists. Similarly, when the output of the bandpass filter 44 in the signal processing unit 40 has a certain level, this is because the true signal component SC to be detected exists and the signal component SD as an image exists. There are two possible ways.
- FIG. 3 is a flowchart showing an operation procedure of the spectrum analyzer of the present embodiment for measuring signal components in a predetermined frequency range while performing image removal.
- the signal processing unit 40 determines whether or not the start of measurement of the signal component is instructed (step 100). If there is no instruction, a negative determination is made and this determination is repeated.
- step 100 When a predetermined measurement start operation is performed by the user with the signal under test RFin being input to the signal input terminal IN, an affirmative determination is made in the determination of step 100.
- the signal processing unit 40 determines whether or not the output of one of the bandpass filters 42 exceeds the predetermined value (Step 102). If it exceeds, an affirmative determination is made, and the signal processing unit 40 takes in the output value of the other bandpass filter 44 and stores it together with the sweep frequency at that time (step 103).
- the signal processing unit 40 determines that the current frequency is It is determined whether or not the force is the upper limit value of the frequency sweep (step 104). If the upper limit has not been reached, a negative determination is made, and then the signal processing unit 40 increases the sweep frequency by a predetermined value (step 105). For example, the values of the frequency division ratios Nl and N2 of the variable frequency dividers 18C and 28C are updated to values obtained by adding “1” respectively. This makes the sweep frequency the reference Increases by the frequency fr of the frequency signal. In addition, the frequency of the two local oscillation signals Lo and Lo
- step 104 If the sweep frequency reaches the upper limit value, an affirmative determination is made in the determination in step 104.
- the signal processing unit 40 reads the output value stored in step 103, for example, The measurement result is displayed with the sweep frequency on the horizontal axis and the signal level of each frequency component on the vertical axis (step 106). In this way, a series of measurements related to the signal under test RFin is completed.
- the level of the signal component that has passed through the two bandpass filters 42 and 44 is observed, and when the output value increases at the same time, a true signal component exists. If only one of the output values rises, it can be removed as an image.
- the frequency f of the two local oscillation signals Lo and Lo is maintained while maintaining the state where the frequencies of the signal components SA and SB are matched.
- a force using two sets of mixers and a local oscillator may use three or more sets of mixers and a local oscillator.
- the signal processing unit 40 includes a control unit configured by a CPU or the like separately from the signal processing unit 40 configured by the force DSP that also performs frequency sweep control, and the like.
- the control unit may be made to control the overall operation of the spectrum analyzer including the frequency sweep.
- the output value of one bandpass filter 42 exceeds a predetermined value
- the output value of the other bandpass filter 44 is measured. If the output value of both of the two bandpass filters 42 and 44 exceeds the specified value, the output value of either one of these two bandpass filters 42 or 44 is captured as the measured value. The average value of both outputs may be taken in as a measured value.
- the present invention may be applied to other combinations of forces that match the frequencies of the signal components SA and SC that are lower than 1 2 and 1 L2.
- the frequency of the signal component SB higher than the frequency f of one local oscillation signal Lo and the other local oscillation signal Lo
- the frequency of the component SC may be matched so that when both of these signal components SB and SC are detected at the same time, it is determined that a true signal component exists.
- the frequency of the signal component SA lower than the frequency f of one local oscillation signal Lo and the other
- V is described when the present invention is applied to a spectrum analyzer.
- the frequency component of the detected signal RFin is measured by a device other than the spectrum analyzer, You may make it apply this invention.
- the bandpass filters 42 and 44 are provided in the signal processing unit 40.
- a band constituted by a digital filter between the analog-digital converters 16 and 26 and the signal processing unit 40 is provided.
- Install a pass filter, mixer 10, 20 and low-pass filter 1 A band-pass filter constituted by an analog circuit may be provided between 4 and 24.
- frequency component extraction and image removal are performed based on the result of frequency conversion performed on the signal under measurement in parallel.
- the configuration can be simplified compared to the case where the frequency conversion is repeatedly performed by the configuration of cascade connection.
- the measurement time can be shortened and the frequency component of the signal under measurement varies.
- the accuracy of measurement can be improved because the influence of is eliminated.
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Abstract
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112006001951T DE112006001951T5 (de) | 2005-07-26 | 2006-07-12 | Frequenzkomponenten-Messvorrichtung |
US11/995,318 US20090315999A1 (en) | 2005-07-26 | 2006-07-12 | Frequency component measuring device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2005-215453 | 2005-07-26 | ||
JP2005215453A JP4782502B2 (ja) | 2005-07-26 | 2005-07-26 | 周波数成分測定装置 |
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WO2007013302A1 true WO2007013302A1 (ja) | 2007-02-01 |
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PCT/JP2006/313834 WO2007013302A1 (ja) | 2005-07-26 | 2006-07-12 | 周波数成分測定装置 |
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US (1) | US20090315999A1 (ja) |
JP (1) | JP4782502B2 (ja) |
DE (1) | DE112006001951T5 (ja) |
WO (1) | WO2007013302A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2020230502A1 (ja) * | 2019-05-14 | 2020-11-19 | 古野電気株式会社 | 観測信号生成装置、観測装置、観測信号生成方法、観測方法、観測信号生成プログラム、および、観測プログラム |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009081780A1 (ja) * | 2007-12-20 | 2009-07-02 | Advantest Corporation | 周波数特性測定装置 |
JP6308489B2 (ja) * | 2013-10-18 | 2018-04-11 | 国立研究開発法人産業技術総合研究所 | 測定装置、測定方法、プログラム、記録媒体 |
JP6076931B2 (ja) * | 2014-03-14 | 2017-02-08 | 三菱電機株式会社 | 周波数測定装置、周波数測定方法、及びプログラム |
JP5947943B1 (ja) * | 2015-03-27 | 2016-07-06 | アンリツ株式会社 | 信号解析装置及び方法 |
US10859614B2 (en) * | 2016-01-22 | 2020-12-08 | Mezmeriz Inc. | Signal detection apparatus, method, and applications |
JPWO2023089809A1 (ja) * | 2021-11-22 | 2023-05-25 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS5868677A (ja) * | 1981-10-20 | 1983-04-23 | Nec Corp | スペクトラムアナライザ |
WO2002029426A1 (fr) * | 2000-10-02 | 2002-04-11 | Advantest Corporation | Procede de mesure a balayage a conversion de frequence |
Family Cites Families (1)
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US5937341A (en) * | 1996-09-13 | 1999-08-10 | University Of Washington | Simplified high frequency tuner and tuning method |
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2005
- 2005-07-26 JP JP2005215453A patent/JP4782502B2/ja active Active
-
2006
- 2006-07-12 US US11/995,318 patent/US20090315999A1/en not_active Abandoned
- 2006-07-12 WO PCT/JP2006/313834 patent/WO2007013302A1/ja active Application Filing
- 2006-07-12 DE DE112006001951T patent/DE112006001951T5/de not_active Ceased
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5868677A (ja) * | 1981-10-20 | 1983-04-23 | Nec Corp | スペクトラムアナライザ |
WO2002029426A1 (fr) * | 2000-10-02 | 2002-04-11 | Advantest Corporation | Procede de mesure a balayage a conversion de frequence |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020230502A1 (ja) * | 2019-05-14 | 2020-11-19 | 古野電気株式会社 | 観測信号生成装置、観測装置、観測信号生成方法、観測方法、観測信号生成プログラム、および、観測プログラム |
US20220050065A1 (en) * | 2019-05-14 | 2022-02-17 | Furuno Electric Co., Ltd. | Observation signal generation device, observation device, observation signal generation method, and observation method |
JP7488814B2 (ja) | 2019-05-14 | 2024-05-22 | 古野電気株式会社 | 観測信号生成装置、観測装置、観測信号生成方法、観測方法、観測信号生成プログラム、および、観測プログラム |
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Publication number | Publication date |
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JP4782502B2 (ja) | 2011-09-28 |
US20090315999A1 (en) | 2009-12-24 |
DE112006001951T5 (de) | 2008-05-29 |
JP2007033171A (ja) | 2007-02-08 |
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