CN103217577B - Measure digital phasemeter and the method thereof of the change of radio-frequency signal phase place - Google Patents
Measure digital phasemeter and the method thereof of the change of radio-frequency signal phase place Download PDFInfo
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Abstract
The present invention discloses a kind of digital phasemeter and the method thereof of measuring the change of radio-frequency signal phase place, described digital phasemeter comprises the radio-frequency signal mixing frequency down circuit, AD converter and the core algorithm computing circuit that are connected successively, described radio-frequency signal mixing frequency down circuit is used for the high-frequency signal filtering direct current component to be measured of input, and reduces the frequency of high-frequency signal; The simulating signal to be measured that described AD converter is used for radio-frequency signal mixing frequency down circuit exports is converted to digital signal to be measured; Described core algorithm computing circuit is for measuring the original frequency of described digital signal to be measured, and produce orthogonal signal according to described original frequency, and be direct current signal by orthogonal signal and digital signal mixing to be measured, frequency reducing, then obtain the phase place change of high-frequency signal to be measured through arctangent cp cp operation.The present invention can be widely used in the phase place change of measuring radio-frequency signal, is particularly useful in space laser differential interferometry range finding field.
Description
Technical field
The present invention relates to signal measurement and digital processing field, particularly a kind of high accuracy number phasometer and method thereof measuring the change of radio-frequency signal phase place based on PHASE-LOCKED LOOP PLL TECHNIQUE.
Background technology
Within 1915, einstein establishes Theory of General Relativity, and general relativity has foretold the existence of gravitational wave simultaneously, but the existence of up to the present scientific worker's never direct authenticated gravitational wave.The observation meaning of gravitational wave is not only the direct checking to general relativity, is more that it can provide one to observe the new way in universe, just as observational astronomy to expand to the visual field of the very big expansion mankind all band uranology from visual astronomy.Traditional observational astronomy relies on the detection to electromagnetic radiation completely, the appearance of gravitational astronomy then indicates that observation method has started to surmount the category of electromagnetic interaction, and gravitational wave observation will disclose about the more how strange information in fixed star, galaxy and universe.
At present in the measurement of the detection of spatial attraction ripple and advanced space gravity field, various countries mostly have employed the methodology that laser differential is interfered on the basis optimizing contrast, and the distance change between spacecraft is converted into the phase place change of laser differential interference signal by differential interferometry.And the singularity of space environment can not introduce reference signal as the benchmark measured, so conventional phase meter can not meet the requirement of design.
For ensureing the accuracy of Phase-retrieval, with external LISA(Laser Interferometer Space Antenna, spatial attraction wave antenna) plan as example, phasometer response speed at least 20MHz, precision will reach 2 π μ rad/ √ Hz, advanced space gravity field distribution measurement requires relatively lower (processing speed 5MHz, mrad/ √ Hz).
The stage that the advanced gravity field fields of measurement in space is also in starting is involved at gravitation in China, in the development of phasometer, also fall behind the developed countries such as American-European from far away.
Summary of the invention
The technical problem to be solved in the present invention is exactly solve the deficient problem at high-precision measurement high-frequency signal phase place change field surveying instrument, especially in space laser range finding field, a kind of high accuracy number phasometer and the method thereof of measuring the change of radio-frequency signal phase place based on PHASE-LOCKED LOOP PLL TECHNIQUE is provided.
In order to solve the problem, the invention provides a kind of digital phasemeter measuring the change of radio-frequency signal phase place, comprising: the radio-frequency signal mixing frequency down circuit, AD converter and the core algorithm computing circuit that are connected successively, wherein,
Described radio-frequency signal mixing frequency down circuit is used for the high-frequency signal filtering direct current component to be measured of input, and reduces the frequency of high-frequency signal;
The simulating signal to be measured that described AD converter is used for radio-frequency signal mixing frequency down circuit exports is converted to digital signal to be measured;
Described core algorithm computing circuit is for measuring the original frequency of described digital signal to be measured, and produce orthogonal signal according to described original frequency, and be direct current signal by orthogonal signal and digital signal mixing to be measured, frequency reducing, then obtain the phase place change of high-frequency signal to be measured through arctangent cp cp operation.
Preferably, above-mentioned digital phasemeter also has following characteristics:
Described digital phasemeter also can comprise RS232 communication module, and described RS232 communication module is connected with described core algorithm computing circuit, and the phase information for the high-frequency signal to be measured obtained by core algorithm computing circuit is sent to computing machine or other equipment.
Preferably, above-mentioned digital phasemeter also has following characteristics:
Described radio-frequency signal mixing frequency down circuit comprises mimic high pass filter, mixed frequency signal generator, mixed analog multiplier and simulation low-pass filter, wherein, described mimic high pass filter is connected with mixed analog multiplier with mixed frequency signal generator, described mixed frequency signal generator is connected with described mixed analog multiplier, and mixed analog multiplier is connected with described simulation low-pass filter;
Described mimic high pass filter is used for, by the high-frequency signal filtering direct current component to be measured of input, being sent to mixed frequency signal generator and mixed analog multiplier;
Described mixed frequency signal generator for receiving the output signal of mimic high pass filter, and exports mixed frequency signal and is sent to mixed analog multiplier;
The mixed frequency signal that described mixed analog multiplier is used for the output signal of the mimic high pass filter received and mixed frequency signal generator export carries out mixing, and is sent to simulation low-pass filter;
The HFS filtering of mixed frequency signal that described simulation low-pass filter is used for receiving, with frequency reducing, is sent to described AD converter.
Preferably, above-mentioned digital phasemeter also has following characteristics:
Described core algorithm computing circuit comprises frequency meter, local oscillator, the first multiplier, the second multiplier, the first low-pass filter, the second low-pass filter, arctangent cp cp operation device and frequency feedback controller; Wherein, frequency meter is connected with local oscillator, local oscillator is connected with frequency feedback controller with the first multiplier, the second multiplier respectively, first multiplier, the first low-pass filter are connected successively with arctangent cp cp operation device, second multiplier, the second low-pass filter are connected successively with arctangent cp cp operation device, and arctangent cp cp operation device is connected with frequency feedback controller;
The digital signal to be measured that described frequency meter is used for AD converter sends is measured, and obtains the original frequency of digital signal to be measured, and described original frequency is fed back to local oscillator;
The original frequency that described local oscillator is used for according to obtaining produces orthogonal cosine signal and sinusoidal signal, described cosine signal is sent to the first multiplier, described sinusoidal signal is sent to the second multiplier;
Described first multiplier is used for the digital signal to be measured that described cosine signal and AD converter send to be multiplied, and is sent to the first low-pass filter;
Described second multiplier is used for the digital signal to be measured that described sinusoidal signal and AD converter send to be multiplied, and is sent to the second low-pass filter;
The signal down that described first low-pass filter is used for the first multiplier to send is the first direct current signal, is sent to arctangent cp cp operation device;
The signal down that described second low-pass filter is used for the second multiplier to send is the second direct current signal, is sent to arctangent cp cp operation device;
The phase place that described arctangent cp cp operation device is used for described first direct current signal and the second direct current signal to carry out phase differential and high-frequency signal to be measured that arctangent cp cp operation obtains reference signal and local Vib. changes, and exports;
Described frequency feedback controller, for calculating the frequency error between local oscillator and reference signal, feeds back to local oscillator, to adjust the frequency of local oscillator signals, makes the change of the frequency following of local oscillator signals high-frequency signal to be measured.
In order to solve the problem, the invention provides a kind of method measuring the change of radio-frequency signal phase place, comprising:
Radio-frequency signal mixing frequency down circuit by the high-frequency signal filtering direct current component to be measured of input, and reduces the frequency of high-frequency signal;
The simulating signal to be measured that radio-frequency signal mixing frequency down circuit exports is converted to digital signal to be measured by AD converter;
The original frequency of described digital signal to be measured measured by core algorithm computing circuit, and produce orthogonal signal according to described original frequency, and be direct current signal by orthogonal signal and digital signal mixing to be measured, frequency reducing, then obtain the phase place change of high-frequency signal to be measured through arctangent cp cp operation.
Preferably, said method also has following characteristics:
Described radio-frequency signal mixing frequency down circuit comprises mimic high pass filter, mixed frequency signal generator, mixed analog multiplier and simulation low-pass filter;
Described radio-frequency signal mixing frequency down circuit is by the high-frequency signal filtering direct current component to be measured of input, and the step reducing the frequency of high-frequency signal comprises:
Described mimic high pass filter, by the high-frequency signal filtering direct current component to be measured of input, is sent to mixed frequency signal generator and mixed analog multiplier;
Described mixed frequency signal generator receives the output signal of mimic high pass filter, and exports mixed frequency signal and be sent to mixed analog multiplier;
The mixed frequency signal that the output signal of the mimic high pass filter received and mixed frequency signal generator export is carried out mixing by described mixed analog multiplier, and is sent to simulation low-pass filter;
The HFS filtering of mixed frequency signal that receives with frequency reducing, is sent to described AD converter by described simulation low-pass filter.
Preferably, said method also has following characteristics:
Described core algorithm computing circuit comprises frequency meter, local oscillator, the first multiplier, the second multiplier, the first low-pass filter, the second low-pass filter, arctangent cp cp operation device and frequency feedback controller;
The original frequency of described digital signal to be measured measured by described core algorithm computing circuit, and produce orthogonal signal according to described original frequency, and be direct current signal by orthogonal signal and digital signal mixing to be measured, frequency reducing, then the step of the phase place change obtaining high-frequency signal to be measured through arctangent cp cp operation comprises:
Described frequency meter is measured the digital signal to be measured that AD converter sends, and obtains the original frequency of digital signal to be measured, and described original frequency is fed back to local oscillator;
Described local oscillator produces orthogonal cosine signal and sinusoidal signal according to the original frequency obtained, and described cosine signal is sent to the first multiplier, and described sinusoidal signal is sent to the second multiplier;
The digital signal to be measured that described cosine signal and AD converter send is multiplied by described first multiplier, and be sent to the first low-pass filter, the signal down that first multiplier sends by described first low-pass filter is the first direct current signal, is sent to arctangent cp cp operation device;
The digital signal to be measured that described sinusoidal signal and AD converter send is multiplied by described second multiplier, and be sent to the second low-pass filter, the signal down that second multiplier sends by described second low-pass filter is the second direct current signal, is sent to arctangent cp cp operation device;
The phase place that described first direct current signal and the second direct current signal are carried out phase differential and high-frequency signal to be measured that arctangent cp cp operation obtains reference signal and local Vib. by described arctangent cp cp operation device changes, and exports.
Preferably, said method also has following characteristics:
Described core algorithm computing circuit also comprises frequency feedback controller;
The original frequency of described digital signal to be measured measured by described core algorithm computing circuit, and produce orthogonal signal according to described original frequency, and be direct current signal by orthogonal signal and digital signal mixing to be measured, frequency reducing, then the step of the phase place change obtaining high-frequency signal to be measured through arctangent cp cp operation also comprises:
Frequency feedback controller calculates the frequency error between local oscillator and reference signal, feeds back to local oscillator, to adjust the frequency of local oscillator signals, makes the change of the frequency following of local oscillator signals high-frequency signal to be measured.
The present invention can be widely used in the phase place change of measuring radio-frequency signal (being greater than 2MHz), is particularly useful in space laser differential interferometry range finding field.The present invention is based on FPGA(Field-Programmable Gate Array, field programmable gate array) the design of Phase Meter with High Precision, most arithmetic section all completes in FPGA, in the hardware implementing of phasometer, FPGA has the advantage of parallel processing with the advantage of its ardware feature, so have incomparable advantage in digital signal processing at a high speed.
Accompanying drawing explanation
Fig. 1 is the schematic diagram measuring the high accuracy number phasometer of radio-frequency signal phase place change based on PHASE-LOCKED LOOP PLL TECHNIQUE of the embodiment of the present invention;
Fig. 2 is the radio-frequency signal mixing frequency down circuit schematic diagram of the embodiment of the present invention;
Fig. 3 is the core algorithm computing circuit schematic diagram of the embodiment of the present invention.
Embodiment
Hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
As shown in Figure 1, the digital phasemeter of the measurement radio-frequency signal phase place change of the embodiment of the present invention, comprising: the radio-frequency signal mixing frequency down circuit, AD converter and the core algorithm computing circuit that are connected successively, wherein,
Described radio-frequency signal mixing frequency down circuit is used for the high-frequency signal filtering direct current component to be measured of input, and reduces the frequency of high-frequency signal;
The simulating signal to be measured that described AD converter is used for radio-frequency signal mixing frequency down circuit exports is converted to digital signal to be measured;
Described core algorithm computing circuit is for measuring the original frequency of described digital signal to be measured, and produce orthogonal signal according to described original frequency, and be direct current signal by orthogonal signal and digital signal mixing to be measured, frequency reducing, then obtain the phase place change of high-frequency signal to be measured through arctangent cp cp operation.
In addition, digital phasemeter also can comprise RS232 communication module, and described RS232 communication module is connected with described core algorithm computing circuit, and the phase information for the high-frequency signal to be measured obtained by core algorithm computing circuit is sent to computing machine or other equipment.
As shown in Figure 2, described radio-frequency signal mixing frequency down circuit comprises mimic high pass filter, mixed frequency signal generator, mixed analog multiplier and simulation low-pass filter, wherein, described mimic high pass filter is connected with mixed analog multiplier with mixed frequency signal generator, described mixed frequency signal generator is connected with described mixed analog multiplier, and mixed analog multiplier is connected with described simulation low-pass filter.
The present invention measures the phase place change of high-frequency signal to be measured, and measured signal is designated as: s
0=I
0cos ((ω
0± Δ ω) t+ Δ φ)+A
0.
Described mimic high pass filter is used for the high-frequency signal (s to be measured of input
0=I
0cos ((ω
0± Δ ω) t+ Δ φ)+A
0) filtering direct current component, be sent to mixed frequency signal generator and mixed analog multiplier, now signal can be designated as: I
0cos ((ω
0± Δ ω) t+ Δ φ).
Described mixed frequency signal generator for receiving the output signal of mimic high pass filter, and exports mixed frequency signal (I
0cos (ω
0± Δ ω-Δ ω) t) be sent to mixed analog multiplier;
The mixed frequency signal that described mixed analog multiplier is used for the output signal of the mimic high pass filter received and mixed frequency signal generator export carries out mixing, and is sent to simulation low-pass filter;
The HFS filtering of mixed frequency signal that described simulation low-pass filter is used for receiving is with frequency reducing, and be sent to described AD converter, now signal can be designated as: I
0cos (Δ ω t+ Δ φ).
As shown in Figure 3, described core algorithm computing circuit adopts FPGA main circuit board usually, comprises frequency meter, local oscillator, the first multiplier, the second multiplier, the first low-pass filter, the second low-pass filter, arctangent cp cp operation device and frequency feedback controller; Wherein, frequency meter is connected with local oscillator, local oscillator is connected with frequency feedback controller with the first multiplier, the second multiplier respectively, first multiplier, the first low-pass filter are connected successively with arctangent cp cp operation device, second multiplier, the second low-pass filter are connected successively with arctangent cp cp operation device, and arctangent cp cp operation device is connected with frequency feedback controller;
The digital signal to be measured that described frequency meter is used for AD converter sends is measured, and obtains the original frequency Δ ω of digital signal to be measured, and described original frequency Δ ω is fed back to local oscillator;
The original frequency that described local oscillator is used for according to obtaining produces orthogonal sinusoidal signal s
2=Isin (Δ ω t) and cosine signal s
1=Icos (Δ ω t), by described cosine signal s
1=Icos (Δ ω t) is sent to the first multiplier, by described sinusoidal signal s
2=Isin (Δ ω t) is sent to the second multiplier;
Described first multiplier is used for described cosine signal s
1=Icos (Δ ω t) is multiplied with the digital signal to be measured that AD converter sends, and multiplication result is designated as:
And be sent to the first low-pass filter;
Described second multiplier is used for described sinusoidal signal s
2=Isin (Δ ω t) is multiplied with the digital signal to be measured that AD converter sends, and multiplication result is designated as:
And be sent to the second low-pass filter;
Described first low-pass filter is used for the frequency multiplication composition in filtering multiplication result, and the signal down sent by the first multiplier is the first direct current signal Q', is sent to arctangent cp cp operation device;
Described second low-pass filter is used for the frequency multiplication composition in filtering multiplication result, and the signal down sent by the second multiplier is the second direct current signal P', is sent to arctangent cp cp operation device;
Described arctangent cp cp operation device is used for described second direct current signal and the first direct current signal to carry out the phase differential that arctangent cp cp operation obtains reference signal and local Vib.
(i.e. the phase place change of high-frequency signal to be measured), and export;
Described frequency feedback controller, for calculating the frequency error between local oscillator and reference signal, feeds back to local oscillator, to adjust the frequency Δ ω of local oscillator signals, makes the change of the frequency following of local oscillator signals high-frequency signal to be measured.
In an application example,
Simulation low-pass filter in radio-frequency signal mixing frequency down circuit is the BLP1.9+ passive low ventilating filter that mini circuits company produces, and cutoff frequency is 1.9MHz.Mixed analog multiplier is MAXIM company MLT04G.What mixed frequency signal generator adopted is the AD9854DDS chip that Analog Devices company produces.The main effect of mimic high pass filter is the flip-flop in isolation signals, selects the electric capacity of 0.1uF and the resistance composition block isolating circuit of 1K.
AD converter is the AD9254 that Analog Devices company produces, and sampling rate 150MSPS, precision is 14.
Core algorithm computing circuit is FPGA main circuit board, employing be the DE3-340 that comparatively ripe Terasic company produces, fpga chip is the Stratix III EP3SL340H1152C2 that altera corp produces.
RS232 communication module completes the data communication of phasometer and intercomputer, adopts the HSMC Communication Card that Terasic company produces.
Correspondingly, the method for the measurement radio-frequency signal phase place change of the embodiment of the present invention, comprising:
Step 1, radio-frequency signal mixing frequency down circuit by the high-frequency signal filtering direct current component to be measured of input, and reduces the frequency of high-frequency signal;
Step 2, the simulating signal to be measured that radio-frequency signal mixing frequency down circuit exports is converted to digital signal to be measured by AD converter;
Step 3, the original frequency of described digital signal to be measured measured by core algorithm computing circuit, and produce orthogonal signal according to described original frequency, and be direct current signal by orthogonal signal and digital signal mixing to be measured, frequency reducing, then obtain the phase place change of high-frequency signal to be measured through arctangent cp cp operation.
Wherein, step 1 specifically comprises:
Mimic high pass filter described in 1.1, by the high-frequency signal filtering direct current component to be measured of input, is sent to mixed frequency signal generator and mixed analog multiplier;
Mixed frequency signal generator described in 1.2 receives the output signal of mimic high pass filter, and exports mixed frequency signal and be sent to mixed analog multiplier;
The mixed frequency signal that the output signal of the mimic high pass filter received and mixed frequency signal generator export is carried out mixing by mixed analog multiplier described in 1.3, and is sent to simulation low-pass filter;
The HFS filtering of mixed frequency signal that receives with frequency reducing, is sent to described AD converter by simulation low-pass filter described in 1.4.
Step 3 specifically comprises:
Frequency meter described in 3.1 is measured the digital signal to be measured that AD converter sends, and obtains the original frequency of digital signal to be measured, and described original frequency is fed back to local oscillator;
Local oscillator described in 3.2 produces orthogonal cosine signal and sinusoidal signal according to the original frequency obtained, and described cosine signal is sent to the first multiplier, and described sinusoidal signal is sent to the second multiplier;
The digital signal to be measured that described cosine signal and AD converter send is multiplied by the first multiplier described in 3.3, and be sent to the first low-pass filter, the signal down that first multiplier sends by described first low-pass filter is the first direct current signal, is sent to arctangent cp cp operation device;
The digital signal to be measured that described sinusoidal signal and AD converter send is multiplied by the second multiplier described in 3.4, and be sent to the second low-pass filter, the signal down that second multiplier sends by described second low-pass filter is the second direct current signal, is sent to arctangent cp cp operation device;
The phase place that described second direct current signal and the first direct current signal are carried out phase differential and high-frequency signal to be measured that arctangent cp cp operation obtains reference signal and local Vib. by arctangent cp cp operation device described in 3.5 changes, and exports.
Wherein, step 3.3 and 3.4 walks abreast and carries out.
In addition, step 3 also comprises:
3.6 frequency feedback controllers calculate the frequency error between local oscillator and reference signal, feed back to local oscillator, to adjust the frequency of local oscillator signals, make the change of the frequency following of local oscillator signals high-frequency signal to be measured.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. measure a digital phasemeter for radio-frequency signal phase place change, it is characterized in that, comprising: the radio-frequency signal mixing frequency down circuit, AD converter and the core algorithm computing circuit that are connected successively, wherein,
Described radio-frequency signal mixing frequency down circuit is used for the high-frequency signal filtering direct current component to be measured of input, and reduces the frequency of high-frequency signal;
The simulating signal to be measured that described AD converter is used for radio-frequency signal mixing frequency down circuit exports is converted to digital signal to be measured;
Described core algorithm computing circuit is for measuring the original frequency of described digital signal to be measured, and produce orthogonal signal according to described original frequency, and be direct current signal by orthogonal signal and digital signal mixing to be measured, frequency reducing, then obtain the phase place change of high-frequency signal to be measured through arctangent cp cp operation.
2. digital phasemeter as claimed in claim 1, is characterized in that,
Described digital phasemeter also can comprise RS232 communication module, and described RS232 communication module is connected with described core algorithm computing circuit, and the phase information for the high-frequency signal to be measured obtained by core algorithm computing circuit is sent to computing machine or other equipment.
3. digital phasemeter as claimed in claim 1 or 2, is characterized in that,
Described radio-frequency signal mixing frequency down circuit comprises mimic high pass filter, mixed frequency signal generator, mixed analog multiplier and simulation low-pass filter, wherein, described mimic high pass filter is connected with mixed analog multiplier with mixed frequency signal generator, described mixed frequency signal generator is connected with described mixed analog multiplier, and mixed analog multiplier is connected with described simulation low-pass filter;
Described mimic high pass filter is used for, by the high-frequency signal filtering direct current component to be measured of input, being sent to mixed frequency signal generator and mixed analog multiplier;
Described mixed frequency signal generator for receiving the output signal of mimic high pass filter, and exports mixed frequency signal and is sent to mixed analog multiplier;
The mixed frequency signal that described mixed analog multiplier is used for the output signal of the mimic high pass filter received and mixed frequency signal generator export carries out mixing, and is sent to simulation low-pass filter;
The HFS filtering of mixed frequency signal that described simulation low-pass filter is used for receiving, with frequency reducing, is sent to described AD converter.
4. digital phasemeter as claimed in claim 3, is characterized in that,
Described core algorithm computing circuit comprises frequency meter, local oscillator, the first multiplier, the second multiplier, the first low-pass filter, the second low-pass filter, arctangent cp cp operation device and frequency feedback controller; Wherein, frequency meter is connected with local oscillator, local oscillator is connected with frequency feedback controller with the first multiplier, the second multiplier respectively, first multiplier, the first low-pass filter are connected successively with arctangent cp cp operation device, second multiplier, the second low-pass filter are connected successively with arctangent cp cp operation device, and arctangent cp cp operation device is connected with frequency feedback controller;
The digital signal to be measured that described frequency meter is used for AD converter sends is measured, and obtains the original frequency of digital signal to be measured, and described original frequency is fed back to local oscillator;
The original frequency that described local oscillator is used for according to obtaining produces orthogonal cosine signal and sinusoidal signal, described cosine signal is sent to the first multiplier, described sinusoidal signal is sent to the second multiplier;
Described first multiplier is used for the digital signal to be measured that described cosine signal and AD converter send to be multiplied, and is sent to the first low-pass filter;
Described second multiplier is used for the digital signal to be measured that described sinusoidal signal and AD converter send to be multiplied, and is sent to the second low-pass filter;
The signal down that described first low-pass filter is used for the first multiplier to send is the first direct current signal, is sent to arctangent cp cp operation device;
The signal down that described second low-pass filter is used for the second multiplier to send is the second direct current signal, is sent to arctangent cp cp operation device;
The phase place that described arctangent cp cp operation device is used for described second direct current signal and the first direct current signal to carry out phase differential and high-frequency signal to be measured that arctangent cp cp operation obtains reference signal and local Vib. changes, and exports;
Described frequency feedback controller, for calculating the frequency error between local oscillator and reference signal, feeds back to local oscillator, to adjust the frequency of local oscillator signals, makes the change of the frequency following of local oscillator signals high-frequency signal to be measured.
5. measure a method for radio-frequency signal phase place change, comprising:
Radio-frequency signal mixing frequency down circuit by the high-frequency signal filtering direct current component to be measured of input, and reduces the frequency of high-frequency signal;
The simulating signal to be measured that radio-frequency signal mixing frequency down circuit exports is converted to digital signal to be measured by AD converter;
The original frequency of described digital signal to be measured measured by core algorithm computing circuit, and produce orthogonal signal according to described original frequency, and be direct current signal by orthogonal signal and digital signal mixing to be measured, frequency reducing, then obtain the phase place change of high-frequency signal to be measured through arctangent cp cp operation.
6. method as claimed in claim 5, is characterized in that,
Described radio-frequency signal mixing frequency down circuit comprises mimic high pass filter, mixed frequency signal generator, mixed analog multiplier and simulation low-pass filter;
Described radio-frequency signal mixing frequency down circuit is by the high-frequency signal filtering direct current component to be measured of input, and the step reducing the frequency of high-frequency signal comprises:
Described mimic high pass filter, by the high-frequency signal filtering direct current component to be measured of input, is sent to mixed frequency signal generator and mixed analog multiplier;
Described mixed frequency signal generator receives the output signal of mimic high pass filter, and exports mixed frequency signal and be sent to mixed analog multiplier;
The mixed frequency signal that the output signal of the mimic high pass filter received and mixed frequency signal generator export is carried out mixing by described mixed analog multiplier, and is sent to simulation low-pass filter;
The HFS filtering of mixed frequency signal that receives with frequency reducing, is sent to described AD converter by described simulation low-pass filter.
7. method as claimed in claim 5, is characterized in that,
Described core algorithm computing circuit comprises frequency meter, local oscillator, the first multiplier, the second multiplier, the first low-pass filter, the second low-pass filter, arctangent cp cp operation device and frequency feedback controller;
The original frequency of described digital signal to be measured measured by described core algorithm computing circuit, and produce orthogonal signal according to described original frequency, and be direct current signal by orthogonal signal and digital signal mixing to be measured, frequency reducing, then the step of the phase place change obtaining high-frequency signal to be measured through arctangent cp cp operation comprises:
Described frequency meter is measured the digital signal to be measured that AD converter sends, and obtains the original frequency of digital signal to be measured, and described original frequency is fed back to local oscillator;
Described local oscillator produces orthogonal cosine signal and sinusoidal signal according to the original frequency obtained, and described cosine signal is sent to the first multiplier, and described sinusoidal signal is sent to the second multiplier;
The digital signal to be measured that described cosine signal and AD converter send is multiplied by described first multiplier, and be sent to the first low-pass filter, the signal down that first multiplier sends by described first low-pass filter is the first direct current signal, is sent to arctangent cp cp operation device;
The digital signal to be measured that described sinusoidal signal and AD converter send is multiplied by described second multiplier, and be sent to the second low-pass filter, the signal down that second multiplier sends by described second low-pass filter is the second direct current signal, is sent to arctangent cp cp operation device;
The phase place that described second direct current signal and the first direct current signal are carried out phase differential and high-frequency signal to be measured that arctangent cp cp operation obtains reference signal and local Vib. by described arctangent cp cp operation device changes, and exports.
8. method as claimed in claim 7, is characterized in that,
Described core algorithm computing circuit also comprises frequency feedback controller;
The original frequency of described digital signal to be measured measured by described core algorithm computing circuit, and produce orthogonal signal according to described original frequency, and be direct current signal by orthogonal signal and digital signal mixing to be measured, frequency reducing, then the step of the phase place change obtaining high-frequency signal to be measured through arctangent cp cp operation also comprises:
Frequency feedback controller calculates the frequency error between local oscillator and reference signal, feeds back to local oscillator, to adjust the frequency of local oscillator signals, makes the change of the frequency following of local oscillator signals high-frequency signal to be measured.
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| CN201310128776.7A CN103217577B (en) | 2013-04-15 | 2013-04-15 | Measure digital phasemeter and the method thereof of the change of radio-frequency signal phase place |
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| CN104090163B (en) * | 2014-07-23 | 2016-09-21 | 中国电子科技集团公司第五十四研究所 | A kind of high stability, high-precision phase amplitude detection device |
| CN106483376A (en) * | 2015-08-26 | 2017-03-08 | 北京艾美林科技有限公司 | A kind of non-blind area digit phase calculating method and device |
| CN105223582B (en) * | 2015-09-01 | 2018-01-16 | 西安交通大学 | A kind of laser infrared radar imaging device and imaging method based on compressed sensing |
| CN105652282B (en) * | 2015-12-29 | 2018-04-06 | 电子科技大学 | A kind of phase-shift laser rangefinder module |
| CN108535544A (en) * | 2018-04-08 | 2018-09-14 | 华中科技大学 | A kind of high accuracy number Method for Phase Difference Measurement based on quadrature phase demodulation technology |
| CN113612522B (en) * | 2021-08-13 | 2023-03-07 | 陕西航天技术应用研究院有限公司 | Frequency domain deviation processing method and device |
| CN114630477A (en) * | 2022-03-17 | 2022-06-14 | 核工业西南物理研究院 | Stepping phase comparison method, device, equipment and storage medium |
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