CN103217577A - Digital phase meter and method for measuring high-frequency signal phase change - Google Patents
Digital phase meter and method for measuring high-frequency signal phase change Download PDFInfo
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Abstract
The invention discloses a digital phase meter and a method for measuring high-frequency signal phase change. The digital phase meter comprises a high-frequency signal frequency mixing and lowering circuit, an analogy to digital (AD) converter and a core algorithm operational circuit which are sequentially connected. The high-frequency signal frequency mixing and lowering circuit is used for filtering a direct current part of an input high-frequency signal to be measured and lowering the frequency of the high-frequency signal; the AD converter is used for converting an analogy signal to be measured and output by the high-frequency signal frequency mixing and lowering circuit into a digital signal to be measured; and the core algorithm operational circuit is used for measuring the primary frequency of the digital signal to be measured, generating an orthogonal signal according to the primary frequency, conducting frequency mixing and lowering to the orthogonal signal and the digital signal to be measured to generate a direct current signal and then obtaining the phase change of the high-frequency signal to be measured through anti-tangent operation. The digital phase meter and the method can be widely applied to phase change of high-frequency signals, and is particularly applicable to the field of space laser differential interferometry ranging.
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 of measuring the radio-frequency signal phase change based on PHASE-LOCKED LOOP PLL TECHNIQUE.
Background technology
Einstein had set up the general relativity theory in 1915, and general relativity has been foretold the existence of gravitational wave simultaneously, but up to the present the scientific worker never directly verified the existence of gravitational wave.The observation meaning of gravitational wave not only is the direct checking to general relativity, is that more it can provide the new way in an observation universe, just as observational astronomy expands to the human visual field of the very big expansion of all band uranology from visual astronomy.Traditional observational astronomy relies on the detection to electromagnetic radiation fully, the appearance of gravitational astronomy indicates that then observation method has begun to surmount the category of electromagnetic interaction, and gravitational wave observation will disclose about the how strange information in fixed star, galaxy and universe.
At present in the measurement of space gravitational wave detection and advanced space gravity field, the methodology that various countries have adopted laser differential to interfere on the basis of optimizing contrast mostly, differential interferometry is converted into the variable in distance between spacecraft the phase change of laser differential interference signal.And the singularity of space environment can not be introduced reference signal as the benchmark of measuring, so the conventional phase meter can not satisfy designing requirement.
For guaranteeing the accuracy of phase place inverting, with external LISA(Laser Interferometer Space Antenna, the space Eigen Frequency of Gravitational Waves Antenna) plan is example, the phasometer response speed is 20MHz at least, precision will reach 2 π μ rad/ √ Hz, advanced space gravity field distribution measurement requires low (processing speed 5MHz, mrad/ √ Hz) relatively.
The stage that the advanced gravity field fields of measurement in space also is in starting is involved at gravitation in China, also falls behind developed countries such as America and Europe aspect the development of phasometer from far away.
Summary of the invention
The technical problem to be solved in the present invention is exactly the deficient problem that solves at high-precision measurement high-frequency signal phase change field surveying instrument, especially in space laser range finding field, provide a kind of high accuracy number phasometer and method thereof of measuring the radio-frequency signal phase change based on PHASE-LOCKED LOOP PLL TECHNIQUE.
In order to address the above problem, the invention provides a kind of digital phasemeter of measuring the radio-frequency signal phase change, comprising: radio-frequency signal mixing frequency down circuit, AD converter and the core algorithm computing circuit of Xiang Lianing successively, wherein,
Described radio-frequency signal mixing frequency down circuit is used for the high-frequency signal filtering direct current component to be measured with input, and reduces the frequency of high-frequency signal;
The analog signal conversion to be measured that described AD converter is used for the output of radio-frequency signal mixing frequency down circuit is a digital signal to be measured;
Described core algorithm computing circuit is used to measure the original frequency of described digital signal to be measured, and according to described original frequency generation orthogonal signal, and be direct current signal with orthogonal signal and digital signal mixing to be measured, frequency reducing, obtain the phase change of high-frequency signal to be measured again through arctangent cp cp operation.
Preferably, above-mentioned digital phasemeter also has following characteristics:
Described digital phasemeter also can comprise the RS232 communication module, and described RS232 communication module links to each other with described core algorithm computing circuit, and the phase information that is used for high-frequency signal to be measured that the core algorithm computing circuit is obtained 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, mixing analog multiplier and simulation low-pass filter, wherein, described mimic high pass filter links to each other with the mixing analog multiplier with the mixed frequency signal generator, described mixed frequency signal generator links to each other with described mixing analog multiplier, and the mixing analog multiplier links to each other with described simulation low-pass filter;
Described mimic high pass filter is used for the high-frequency signal filtering direct current component to be measured with input, is sent to mixed frequency signal generator and mixing analog multiplier;
Described mixed frequency signal generator is used to receive the output signal of mimic high pass filter, and the output mixed frequency signal is sent to the mixing analog multiplier;
Described mixing analog multiplier is used for the output signal of the mimic high pass filter that will receive and the mixed frequency signal of mixed frequency signal generator output carries out mixing, and is sent to simulation low-pass filter;
Described simulation low-pass filter is used for the HFS filtering of the mixed frequency signal that will receive 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, first multiplier, second multiplier, first low-pass filter, second low-pass filter, arctangent cp cp operation device and frequency feedback controller; Wherein, frequency meter links to each other with local oscillator, local oscillator links to each other with first multiplier, second multiplier and frequency feedback controller respectively, first multiplier, first low-pass filter and arctangent cp cp operation device link to each other successively, second multiplier, second low-pass filter and arctangent cp cp operation device link to each other successively, and the arctangent cp cp operation device links to each other with the frequency feedback controller;
Described frequency meter is used for the digital signal to be measured that 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;
Described local oscillator is used for producing according to the original frequency that obtains the cosine signal and the sinusoidal signal of quadrature, and described cosine signal is sent to first multiplier, and described sinusoidal signal is sent to second multiplier;
Described first multiplier is used for the digital signal to be measured of described cosine signal and AD converter transmission is multiplied each other, and is sent to first low-pass filter;
Described second multiplier is used for the digital signal to be measured of described sinusoidal signal and AD converter transmission is multiplied each other, and is sent to second low-pass filter;
The signal down that described first low-pass filter is used for first multiplier is sent is first direct current signal, is sent to the arctangent cp cp operation device;
The signal down that described second low-pass filter is used for second multiplier is sent is second direct current signal, is sent to the arctangent cp cp operation device;
It is the phase change of high-frequency signal to be measured that described arctangent cp cp operation device is used for described first direct current signal and second direct current signal are carried out the phase differential that arctangent cp cp operation obtains reference signal and local Vib., and output;
Described frequency feedback controller is used to calculate the frequency error between local oscillator and reference signal, feeds back to local oscillator, to adjust the frequency of local oscillator signals, makes the frequency of local oscillator signals follow the variation of high-frequency signal to be measured.
In order to address the above problem, the invention provides a kind of method of measuring the radio-frequency signal phase change, comprising:
The high-frequency signal filtering direct current component to be measured that radio-frequency signal mixing frequency down circuit will be imported, and the frequency of reduction high-frequency signal;
AD converter is a digital signal to be measured with the analog signal conversion to be measured of radio-frequency signal mixing frequency down circuit output;
The core algorithm computing circuit is measured the original frequency of described digital signal to be measured, and according to described original frequency generation orthogonal signal, and be direct current signal with orthogonal signal and digital signal mixing to be measured, frequency reducing, obtain the phase change of high-frequency signal to be measured again 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, mixing analog multiplier and simulation low-pass filter;
The high-frequency signal filtering direct current component to be measured that described radio-frequency signal mixing frequency down circuit will be imported, and the step of the frequency of reduction high-frequency signal comprises:
The high-frequency signal filtering direct current component to be measured that described mimic high pass filter will be imported is sent to mixed frequency signal generator and mixing analog multiplier;
Described mixed frequency signal generator receives the output signal of mimic high pass filter, and the output mixed frequency signal is sent to the mixing analog multiplier;
Described mixing analog multiplier carries out mixing with the output signal of the mimic high pass filter that receives and the mixed frequency signal of mixed frequency signal generator output, and is sent to simulation low-pass filter;
Described simulation low-pass filter with frequency reducing, is sent to described AD converter with the HFS filtering of the mixed frequency signal that receives.
Preferably, said method also has following characteristics:
Described core algorithm computing circuit comprises frequency meter, local oscillator, first multiplier, second multiplier, first low-pass filter, second low-pass filter, arctangent cp cp operation device and frequency feedback controller;
Described core algorithm computing circuit is measured the original frequency of described digital signal to be measured, and according to described original frequency generation orthogonal signal, and be direct current signal with orthogonal signal and digital signal mixing to be measured, frequency reducing, the step that obtains the phase change of high-frequency signal to be measured through arctangent cp cp operation comprises again:
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 is sent to first multiplier according to the cosine signal and the sinusoidal signal of the original frequency generation quadrature that obtains with described cosine signal, and described sinusoidal signal is sent to second multiplier;
Described first multiplier multiplies each other the digital signal to be measured of described cosine signal and AD converter transmission, and be sent to first low-pass filter, described first low-pass filter is first direct current signal with the signal down that first multiplier sends, and is sent to the arctangent cp cp operation device;
Described second multiplier multiplies each other the digital signal to be measured of described sinusoidal signal and AD converter transmission, and be sent to second low-pass filter, described second low-pass filter is second direct current signal with the signal down that second multiplier sends, and is sent to the arctangent cp cp operation device;
It is the phase change of high-frequency signal to be measured that described arctangent cp cp operation device carries out the phase differential that arctangent cp cp operation obtains reference signal and local Vib. with described first direct current signal and second direct current signal, and output.
Preferably, said method also has following characteristics:
Described core algorithm computing circuit also comprises the frequency feedback controller;
Described core algorithm computing circuit is measured the original frequency of described digital signal to be measured, and according to described original frequency generation orthogonal signal, and be direct current signal with orthogonal signal and digital signal mixing to be measured, frequency reducing, the step that obtains the phase change of high-frequency signal to be measured through arctangent cp cp operation also comprises again:
The 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 frequency of local oscillator signals follow the variation of high-frequency signal to be measured.
The present invention can be widely used in the phase change of measuring radio-frequency signal (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, the design of Phase Meter with High Precision field programmable gate array), most arithmetic section is all finished in FPGA, aspect the hardware realization of phasometer, FPGA has the advantage of parallel processing with the advantage of its ardware feature, so aspect the digital signal processing at a high speed incomparable advantage is being arranged.
Description of drawings
Fig. 1 be the embodiment of the invention measure the synoptic diagram of the high accuracy number phasometer of radio-frequency signal phase change based on PHASE-LOCKED LOOP PLL TECHNIQUE;
Fig. 2 is the radio-frequency signal mixing frequency down circuit synoptic diagram of the embodiment of the invention;
Fig. 3 is the core algorithm computing circuit synoptic diagram of the embodiment of the invention.
Embodiment
Hereinafter will be elaborated to embodiments of the invention in conjunction with the accompanying drawings.Need to prove that under the situation of not conflicting, embodiment among the application and the feature among the embodiment be combination in any mutually.
As shown in Figure 1, the digital phasemeter of the measurement radio-frequency signal phase change of the embodiment of the invention comprises: radio-frequency signal mixing frequency down circuit, AD converter and the core algorithm computing circuit of Xiang Lianing successively, wherein,
Described radio-frequency signal mixing frequency down circuit is used for the high-frequency signal filtering direct current component to be measured with input, and reduces the frequency of high-frequency signal;
The analog signal conversion to be measured that described AD converter is used for the output of radio-frequency signal mixing frequency down circuit is a digital signal to be measured;
Described core algorithm computing circuit is used to measure the original frequency of described digital signal to be measured, and according to described original frequency generation orthogonal signal, and be direct current signal with orthogonal signal and digital signal mixing to be measured, frequency reducing, obtain the phase change of high-frequency signal to be measured again through arctangent cp cp operation.
In addition, digital phasemeter also can comprise the RS232 communication module, and described RS232 communication module links to each other with described core algorithm computing circuit, and the phase information that is used for high-frequency signal to be measured that the core algorithm computing circuit is obtained 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, mixing analog multiplier and simulation low-pass filter, wherein, described mimic high pass filter links to each other with the mixing analog multiplier with the mixed frequency signal generator, described mixed frequency signal generator links to each other with described mixing analog multiplier, and the mixing analog multiplier links to each other with described simulation low-pass filter.
The present invention measures the phase 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 with input
0=I
0Cos ((ω
0± Δ ω) t+ Δ φ)+A
0) the filtering direct current component, being sent to mixed frequency signal generator and mixing analog multiplier, this moment, signal can be designated as: I
0Cos ((ω
0± Δ ω) t+ Δ φ).
Described mixed frequency signal generator is used to receive the output signal of mimic high pass filter, and output mixed frequency signal (I
0Cos (ω
0± Δ ω-Δ ω) t) is sent to the mixing analog multiplier;
Described mixing analog multiplier is used for the output signal of the mimic high pass filter that will receive and the mixed frequency signal of mixed frequency signal generator output carries out mixing, and is sent to simulation low-pass filter;
Described simulation low-pass filter is used for the HFS filtering of the mixed frequency signal that will receive with frequency reducing, is sent to described AD converter, and this moment, signal can be designated as: I
0Cos (Δ ω t+ Δ φ).
As shown in Figure 3, described core algorithm computing circuit adopts the FPGA main circuit board usually, comprises frequency meter, local oscillator, first multiplier, second multiplier, first low-pass filter, second low-pass filter, arctangent cp cp operation device and frequency feedback controller; Wherein, frequency meter links to each other with local oscillator, local oscillator links to each other with first multiplier, second multiplier and frequency feedback controller respectively, first multiplier, first low-pass filter and arctangent cp cp operation device link to each other successively, second multiplier, second low-pass filter and arctangent cp cp operation device link to each other successively, and the arctangent cp cp operation device links to each other with the frequency feedback controller;
Described frequency meter is used for the digital signal to be measured that 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;
Described local oscillator is used for producing orthogonal sine s according to the original frequency that obtains
2=Isin (Δ ω t) and cosine signal s
1=Icos (Δ ω t) is with described cosine signal s
1=Icos (Δ ω t) is sent to first multiplier, with described sinusoidal signal s
2=Isin (Δ ω t) is sent to second multiplier;
Described first multiplier is used for described cosine signal s
1=Icos (Δ ω t) multiplies each other with the digital signal to be measured that AD converter sends, and multiplication result is designated as:
And be sent to first low-pass filter;
Described second multiplier is used for described sinusoidal signal s
2=Isin (Δ ω t) multiplies each other with the digital signal to be measured that AD converter sends, and multiplication result is designated as:
And be sent to second low-pass filter;
Described first low-pass filter is used for the frequency multiplication composition of filtering multiplication result, and the signal down that first multiplier is sent is the first direct current signal Q', is sent to the arctangent cp cp operation device;
Described second low-pass filter is used for the frequency multiplication composition of filtering multiplication result, and the signal down that second multiplier is sent is the second direct current signal P', is sent to the arctangent cp cp operation device;
Described arctangent cp cp operation device is used for described second direct current signal and first direct current signal are carried out the phase differential that arctangent cp cp operation obtains reference signal and local Vib.
(being the phase change of high-frequency signal to be measured), and output;
Described frequency feedback controller is used to calculate 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 frequency of local oscillator signals follow the variation of high-frequency signal to be measured.
In an application example,
Simulation low-pass filter in the 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.The mixing analog multiplier is the MLT04G of MAXIM company.What the mixed frequency signal generator adopted is the AD9854DDS chip that Analog Devices company produces.The mimic high pass filter significant feature is the flip-flop in the isolation signals, selects the electric capacity of 0.1uF and the resistance of 1K to form block isolating circuit.
AD converter is the AD9254 that Analog Devices company produces, sampling rate 150MSPS, and precision is 14.
The core algorithm computing circuit is the 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.
The RS232 communication module is finished the data communication of phasometer and intercomputer, the HSMC Communication Card that adopts Terasic company to produce.
Correspondingly, the method for the measurement radio-frequency signal phase change of the embodiment of the invention comprises:
The high-frequency signal filtering direct current component to be measured that step 1, radio-frequency signal mixing frequency down circuit will be imported, and the frequency of reduction high-frequency signal;
Step 2, AD converter is a digital signal to be measured with the analog signal conversion to be measured of radio-frequency signal mixing frequency down circuit output;
Step 3, the core algorithm computing circuit is measured the original frequency of described digital signal to be measured, and produce orthogonal signal according to described original frequency, and be direct current signal with orthogonal signal and digital signal mixing to be measured, frequency reducing, the phase change of high-frequency signal to be measured obtained again through arctangent cp cp operation.
Wherein, step 1 specifically comprises:
1.1 the high-frequency signal filtering direct current component to be measured that described mimic high pass filter will be imported is sent to mixed frequency signal generator and mixing analog multiplier;
1.2 described mixed frequency signal generator receives the output signal of mimic high pass filter, and the output mixed frequency signal is sent to the mixing analog multiplier;
1.3 described mixing analog multiplier carries out mixing with the output signal of the mimic high pass filter that receives and the mixed frequency signal of mixed frequency signal generator output, and is sent to simulation low-pass filter;
1.4 described simulation low-pass filter with frequency reducing, is sent to described AD converter with the HFS filtering of the mixed frequency signal that receives.
Step 3 specifically comprises:
3.1 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;
3.2 described local oscillator is sent to first multiplier according to the cosine signal and the sinusoidal signal of the original frequency generation quadrature that obtains with described cosine signal, and described sinusoidal signal is sent to second multiplier;
3.3 described first multiplier multiplies each other the digital signal to be measured of described cosine signal and AD converter transmission, and be sent to first low-pass filter, described first low-pass filter is first direct current signal with the signal down that first multiplier sends, and is sent to the arctangent cp cp operation device;
3.4 described second multiplier multiplies each other the digital signal to be measured of described sinusoidal signal and AD converter transmission, and be sent to second low-pass filter, described second low-pass filter is second direct current signal with the signal down that second multiplier sends, and is sent to the arctangent cp cp operation device;
3.5 it is the phase change of high-frequency signal to be measured that described arctangent cp cp operation device carries out the phase differential that arctangent cp cp operation obtains reference signal and local Vib. with described second direct current signal and first direct current signal, and output.
Wherein, step 3.3 and 3.4 parallel carrying out.
In addition, step 3 also comprises:
3.6 the 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 frequency of local oscillator signals follow the variation of high-frequency signal to be measured.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a digital phasemeter of measuring the radio-frequency signal phase change is characterized in that, comprising: radio-frequency signal mixing frequency down circuit, AD converter and the core algorithm computing circuit of Xiang Lianing successively, wherein,
Described radio-frequency signal mixing frequency down circuit is used for the high-frequency signal filtering direct current component to be measured with input, and reduces the frequency of high-frequency signal;
The analog signal conversion to be measured that described AD converter is used for the output of radio-frequency signal mixing frequency down circuit is a digital signal to be measured;
Described core algorithm computing circuit is used to measure the original frequency of described digital signal to be measured, and according to described original frequency generation orthogonal signal, and be direct current signal with orthogonal signal and digital signal mixing to be measured, frequency reducing, obtain the phase change of high-frequency signal to be measured again through arctangent cp cp operation.
2. digital phasemeter as claimed in claim 1 is characterized in that,
Described digital phasemeter also can comprise the RS232 communication module, and described RS232 communication module links to each other with described core algorithm computing circuit, and the phase information that is used for high-frequency signal to be measured that the core algorithm computing circuit is obtained 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, mixing analog multiplier and simulation low-pass filter, wherein, described mimic high pass filter links to each other with the mixing analog multiplier with the mixed frequency signal generator, described mixed frequency signal generator links to each other with described mixing analog multiplier, and the mixing analog multiplier links to each other with described simulation low-pass filter;
Described mimic high pass filter is used for the high-frequency signal filtering direct current component to be measured with input, is sent to mixed frequency signal generator and mixing analog multiplier;
Described mixed frequency signal generator is used to receive the output signal of mimic high pass filter, and the output mixed frequency signal is sent to the mixing analog multiplier;
Described mixing analog multiplier is used for the output signal of the mimic high pass filter that will receive and the mixed frequency signal of mixed frequency signal generator output carries out mixing, and is sent to simulation low-pass filter;
Described simulation low-pass filter is used for the HFS filtering of the mixed frequency signal that will receive with frequency reducing, is sent to described AD converter.
4. as any described digital phasemeter in the claim 1～3, it is characterized in that,
Described core algorithm computing circuit comprises frequency meter, local oscillator, first multiplier, second multiplier, first low-pass filter, second low-pass filter, arctangent cp cp operation device and frequency feedback controller; Wherein, frequency meter links to each other with local oscillator, local oscillator links to each other with first multiplier, second multiplier and frequency feedback controller respectively, first multiplier, first low-pass filter and arctangent cp cp operation device link to each other successively, second multiplier, second low-pass filter and arctangent cp cp operation device link to each other successively, and the arctangent cp cp operation device links to each other with the frequency feedback controller;
Described frequency meter is used for the digital signal to be measured that 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;
Described local oscillator is used for producing according to the original frequency that obtains the cosine signal and the sinusoidal signal of quadrature, and described cosine signal is sent to first multiplier, and described sinusoidal signal is sent to second multiplier;
Described first multiplier is used for the digital signal to be measured of described cosine signal and AD converter transmission is multiplied each other, and is sent to first low-pass filter;
Described second multiplier is used for the digital signal to be measured of described sinusoidal signal and AD converter transmission is multiplied each other, and is sent to second low-pass filter;
The signal down that described first low-pass filter is used for first multiplier is sent is first direct current signal, is sent to the arctangent cp cp operation device;
The signal down that described second low-pass filter is used for second multiplier is sent is second direct current signal, is sent to the arctangent cp cp operation device;
It is the phase change of high-frequency signal to be measured that described arctangent cp cp operation device is used for described second direct current signal and first direct current signal are carried out the phase differential that arctangent cp cp operation obtains reference signal and local Vib., and output;
Described frequency feedback controller is used to calculate the frequency error between local oscillator and reference signal, feeds back to local oscillator, to adjust the frequency of local oscillator signals, makes the frequency of local oscillator signals follow the variation of high-frequency signal to be measured.
5. method of measuring the radio-frequency signal phase change comprises:
The high-frequency signal filtering direct current component to be measured that radio-frequency signal mixing frequency down circuit will be imported, and the frequency of reduction high-frequency signal;
AD converter is a digital signal to be measured with the analog signal conversion to be measured of radio-frequency signal mixing frequency down circuit output;
The core algorithm computing circuit is measured the original frequency of described digital signal to be measured, and according to described original frequency generation orthogonal signal, and be direct current signal with orthogonal signal and digital signal mixing to be measured, frequency reducing, obtain the phase change of high-frequency signal to be measured again 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, mixing analog multiplier and simulation low-pass filter;
The high-frequency signal filtering direct current component to be measured that described radio-frequency signal mixing frequency down circuit will be imported, and the step of the frequency of reduction high-frequency signal comprises:
The high-frequency signal filtering direct current component to be measured that described mimic high pass filter will be imported is sent to mixed frequency signal generator and mixing analog multiplier;
Described mixed frequency signal generator receives the output signal of mimic high pass filter, and the output mixed frequency signal is sent to the mixing analog multiplier;
Described mixing analog multiplier carries out mixing with the output signal of the mimic high pass filter that receives and the mixed frequency signal of mixed frequency signal generator output, and is sent to simulation low-pass filter;
Described simulation low-pass filter with frequency reducing, is sent to described AD converter with the HFS filtering of the mixed frequency signal that receives.
7. method as claimed in claim 5 is characterized in that,
Described core algorithm computing circuit comprises frequency meter, local oscillator, first multiplier, second multiplier, first low-pass filter, second low-pass filter, arctangent cp cp operation device and frequency feedback controller;
Described core algorithm computing circuit is measured the original frequency of described digital signal to be measured, and according to described original frequency generation orthogonal signal, and be direct current signal with orthogonal signal and digital signal mixing to be measured, frequency reducing, the step that obtains the phase change of high-frequency signal to be measured through arctangent cp cp operation comprises again:
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 is sent to first multiplier according to the cosine signal and the sinusoidal signal of the original frequency generation quadrature that obtains with described cosine signal, and described sinusoidal signal is sent to second multiplier;
Described first multiplier multiplies each other the digital signal to be measured of described cosine signal and AD converter transmission, and be sent to first low-pass filter, described first low-pass filter is first direct current signal with the signal down that first multiplier sends, and is sent to the arctangent cp cp operation device;
Described second multiplier multiplies each other the digital signal to be measured of described sinusoidal signal and AD converter transmission, and be sent to second low-pass filter, described second low-pass filter is second direct current signal with the signal down that second multiplier sends, and is sent to the arctangent cp cp operation device;
It is the phase change of high-frequency signal to be measured that described arctangent cp cp operation device carries out the phase differential that arctangent cp cp operation obtains reference signal and local Vib. with described second direct current signal and first direct current signal, and output.
8. method as claimed in claim 7 is characterized in that,
Described core algorithm computing circuit also comprises the frequency feedback controller;
Described core algorithm computing circuit is measured the original frequency of described digital signal to be measured, and according to described original frequency generation orthogonal signal, and be direct current signal with orthogonal signal and digital signal mixing to be measured, frequency reducing, the step that obtains the phase change of high-frequency signal to be measured through arctangent cp cp operation also comprises again:
The 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 frequency of local oscillator signals follow the variation of high-frequency signal to be measured.
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