CN205157648U - Non -blind area digital phasemeter device - Google Patents
Non -blind area digital phasemeter device Download PDFInfo
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- CN205157648U CN205157648U CN201520648061.9U CN201520648061U CN205157648U CN 205157648 U CN205157648 U CN 205157648U CN 201520648061 U CN201520648061 U CN 201520648061U CN 205157648 U CN205157648 U CN 205157648U
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Abstract
The utility model discloses a non -blind area digital phasemeter device that can high accuracy self -adaptation signal frequency. Including: low pass analog filter, AD converter, phase measurement algorithm circuit and signal output communication module. Module and signal intensity measured module is trailed through the phase feed back, signal frequency can be adapted to automatically to realize adaptation and the function of optimizing carrier wave modulation frequency, adopt that arcsine module and anticosine module are parallel independently carries out phase place calculation, good in 0 astringency when spending with the help of the arcsine algorithm, the anticosine algorithm is in the good characteristics of 90 astringency when spending to realize 90 degree positive and negative phase place within range high accuracy, efficient non -blind area phase measurement. The utility model discloses can extensively be used for the measurement of the phase difference of high accuracy non -blind area.
Description
Technical field
The utility model relates to one and is applied to industrial automation, 3 D laser scanning, communication, optical storage, navigator fix, the phasometer in the fields such as spacecraft orbit determination, Radar Signal Processing, astronomical sight, especially a kind of non-blind area digit phase counter device.
Background technology
Along with the development of science and technology, become the indispensable part of modern scientific research as a kind of conventional signal detection technique-phase difference measurement technology.By detected phase information, phasometer has important application in fields such as optics, radio survey, microwave, optical-fibre communications, optical storage of new generation, satellite navigation location, spacecraft orbit determination, radar beam synthesis, signal transacting, astronomical sights.
China started to study phasometer the sixties, although there is some good phasometer algorithms and product so far successively, still there is various weak point, had limited to the application of phasometer.
For patent " digital phasemeter and method thereof based on phasometer difference between PHASE-LOCKED LOOP PLL TECHNIQUE the measuring-signal " (patent No.: 201310145977.8), it is in phasometer algorithm, do not introduce amplitude measurement algorithm, thus the amplitude of measured signal and local oscillator cannot be obtained, arctan function and arctangent cp cp operation can only be utilized to carry out inverse phase place, and a phase data can only be obtained;
Because of poor astringency when simultaneously arctan function is near positive and negative 90 degree, no matter is direct computing or tables look-up, all accurately, efficiently can not obtain phase value.
And, this algorithm adopts the algorithm of arc tangent phase place inverse, and this algorithm is subject to the impact of arctan function poor astringency near 90 degree of phase places, is difficult to ensure the phase measurement accuracy near 90 degree, the information handling needs of high speed cannot be realized, exist and measure blind area.
Such as in passive acoustic measurement array process, not only need the phase information measuring sound wave, also need the strength information measuring sound wave, and this patent " digital phasemeter and method thereof based on phasometer difference between PHASE-LOCKED LOOP PLL TECHNIQUE measuring-signal " (patent No.: 201310145977.8), do not possess signal strength measurement function, this field cannot be applied to.
In the application of phasometer, if phasometer has the automatic adaptive faculty of signal frequency, the measurement range such as laser, tellurometer survey and precision will be improved to a great extent, by certain evaluation algorithm, the function optimizing carrier modulation frequency can also be realized, to reach best measurement performance; If balanced phase measurement accuracy and efficiency can be realized in positive and negative 90 degree of scopes, radar etc. can be made to reach the accurately efficient detectivity of non-blind area.
Summary of the invention
The utility model patent, openly provide can high precision, high speed, multi-functional, self-adapting signal frequency a kind of non-blind area digit phase counter device.
For the defect that current phase count and algorithm exist, (, there is the problem measuring blind area in the patent No.: because poor astringency time 201310145977.8) near positive and negative 90 degree to not only solve patent " digital phasemeter and method thereof based on phasometer difference between PHASE-LOCKED LOOP PLL TECHNIQUE measuring-signal ".The function that the equalization phase simultaneously achieving the automatic adaptive faculty of phasometer signal frequency and realize high-precision, non-blind area within the scope of positive and negative 90 degree is measured, concrete solution is as follows:
By adding phase feedback tracking module and signal strength measurement module, can adaptation signal frequency automatically, to realize the function adapting to and optimize carrier modulation frequency; Inverse sine module and arc cosine modular concurrent is adopted to carry out phase calculation independently, good by inverse sine algorithm convergence 0 degree time, the arc cosine algorithm feature that convergence is good 90 degree time, to realize high precision, the phase measurement of high efficiency non-blind area in positive and negative 90 degree of phase range.
Wherein, a kind of non-blind area digit phase counter device is characterized in that comprising low-pass analog filter, AD converter, phase measurement algorithm circuit and signal output communication module; Wherein, described low-pass analog filter is connected with described AD converter, for the high frequency noise filtering by measured signal, to improve the signal to noise ratio (S/N ratio) of measured signal, obtains simulating signal to be measured, is sent to AD converter; Described AD converter is connected with described phase measurement algorithm circuit, for simulating signal to be measured is changed into digital signal to be measured; Described phase measurement algorithm circuit is for measuring the original frequency of described digital signal to be measured, orthogonal signal are produced according to described original frequency, described orthogonal signal and digital signal mixing to be measured, filtering are produced direct current signal, obtain the phase difference φ of measured signal and orthogonal signal again through inverse sine and arc cosine computing, and phase difference φ is sent to described signal output communication module; Described a kind of non-blind area digit phase counter device also comprises signal output communication module, described signal output communication module is connected with phase measurement algorithm circuit, and the phase differential for the measured signal that obtained by phase measurement algorithm circuit and orthogonal signal is sent to computing machine or miscellaneous equipment.
Described a kind of non-blind area digit phase counter device, is characterized in that described phase measurement algorithm circuit comprises frequency meter, local oscillator, the first multiplier, the second multiplier, amplitude arithmetical unit, the first low-pass filter, the second low-pass filter, the first divider, the second divider, inverse sine arithmetical unit, arc cosine arithmetical unit, frequency feedback controller, the first totalizer and the second totalizer; 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, the first divider, arc cosine arithmetical unit are connected successively with the first totalizer, second multiplier, the second low-pass filter, the second divider, inverse sine arithmetical unit are connected successively with the second totalizer, and inverse sine arithmetical unit 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; Described local oscillator is used for producing orthogonal sinusoidal signal and cosine signal according to described original frequency, described cosine signal is sent to the first multiplier, described sinusoidal signal is sent to the second multiplier; The first described 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 and amplitude arithmetical unit; The second described 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; Described amplitude arithmetical unit, for calculating the amplitude signal of the signal of described first multiplier transmission, is sent to the first divider and the second divider respectively; The signal filtering that the first described low-pass filter is used for the first multiplier to send is the first direct current signal, and is sent to the first divider; The signal filtering that the second described low-pass filter is used for the second multiplier to send is the second direct current signal, and is sent to the second divider; The first described divider is used for described first direct current signal and described amplitude signal to be divided by, and is sent to arc cosine arithmetical unit; The second described divider is used for the second described direct current signal and described amplitude signal to be divided by, and is sent to inverse sine arithmetical unit; The signal that described arc cosine arithmetical unit is used for the first divider sends carries out arc cosine computing, obtains the phase difference φ of the orthogonal signal that measured signal and local oscillator export, and signal is sent to the first totalizer; The signal that described inverse sine arithmetical unit is used for the second divider sends carries out inverse sine computing, obtains the phase difference φ of the orthogonal signal that measured signal and local oscillator export, and signal is sent to respectively the second totalizer and frequency feedback controller; The phase signal that described frequency feedback controller is used for inverse sine arithmetical unit sends is calculated to be frequency difference signal, and FEEDBACK CONTROL local oscillator and measured signal realize phase place and Frequency Synchronization, makes local oscillator follow measured signal change; The signal that the first described totalizer is used for arc cosine arithmetical unit sends adds up, thus obtains the time changeable phases signal of measured signal in real time, and exports; The signal that the second described totalizer is used for inverse sine arithmetical unit sends adds up, thus obtains the time changeable phases signal of measured signal in real time, and exports.
The utility model can be widely used in phase place and the phase place change of measuring-signal, and has the feature of efficient non-blind area.The utility model designs based on the Phase Meter with High Precision of FPGA, and except front signal modulate circuit and AD converter, all computings all complete in FPGA inside.FPGA has the advantage of parallel processing, so have incomparable advantage in high-speed figure process.
Accompanying drawing illustrates:
Fig. 1 is a kind of non-blind area digit phase counter device schematic diagram.
Fig. 2 is phase measurement algorithm circuit diagram.
Embodiment
Below the embodiment of a kind of non-blind area digit phase counter device is described in detail:
As shown in Figure 1, a kind of non-blind area of the utility model digit phase counter device, comprising: low-pass analog filter, AD converter, phase measurement algorithm circuit and signal output communication module.Wherein,
Described low-pass analog filter is connected with described AD converter, for by the high frequency noise filtering of measured signal Acos (Δ ω t+ Δ φ) to improve the signal to noise ratio (S/N ratio) of measured signal, obtain simulating signal to be measured, be sent to AD converter;
Described AD converter is connected with described phase measurement algorithm circuit, for simulating signal to be measured is changed into digital signal to be measured;
Described phase measurement algorithm circuit is for measuring the original frequency Δ ω of described digital signal to be measured, orthogonal signal are produced according to described original frequency, described orthogonal signal and digital signal mixing to be measured, filtering are produced direct current signal, then obtains the phase difference φ of measured signal and orthogonal signal through inverse sine and arc cosine computing.And phase difference φ is sent to described signal output communication module;
Described digit phase counter device also comprises signal output communication module, described signal output communication module is connected with phase measurement algorithm circuit, and the phase differential for the measured signal that obtained by phase measurement algorithm circuit and orthogonal signal is sent to computing machine or other equipment.
Described phase measurement algorithm circuit comprises frequency meter, local oscillator, the first multiplier, the second multiplier, amplitude arithmetical unit, the first low-pass filter, the second low-pass filter, the first divider, the second divider, inverse sine arithmetical unit, arc cosine arithmetical unit, frequency feedback controller, the first totalizer and the second totalizer as shown in Figure 2.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, the first divider, arc cosine arithmetical unit are connected successively with the first totalizer, second multiplier, the second low-pass filter, the second divider, inverse sine arithmetical unit are connected successively with the second totalizer, and inverse sine arithmetical unit is connected with frequency feedback controller.The digital signal Acos to be measured (Δ ω t+ Δ φ) that described frequency meter is used for AD converter sends measures, 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 sinusoidal signal Bsin (Δ ω t) and cosine signal Bcos (Δ ω t) according to described original frequency Δ ω, described cosine signal Bcos (Δ ω t) is sent to the first multiplier, described sinusoidal signal Bsin (Δ ω t) is sent to the second multiplier;
The first described multiplier is used for the digital signal Acos to be measured (Δ ω t+ Δ φ) that sent with AD converter by described cosine signal Bcos (Δ ω t), and being multiplied obtains
and be sent to the first low-pass filter and amplitude arithmetical unit;
The second described multiplier is used for the digital signal Acos to be measured (Δ ω t+ Δ φ) that sent with AD converter by described sinusoidal signal Bsin (Δ ω t), and being multiplied obtains
and be sent to the second low-pass filter;
The signal that described amplitude arithmetical unit sends for calculating described first multiplier:
amplitude signal
be sent to the first divider and the second divider respectively;
The signal filtering that described first low-pass filter is used for the first multiplier to send is the first direct current signal
and be sent to the first divider;
The signal filtering that described second low-pass filter is used for the second multiplier to send is the second direct current signal
and be sent to the second divider;
Described first divider is used for described first direct current signal
with described amplitude signal
be divided by obtain cos (Δ φ), and be sent to arc cosine arithmetical unit;
Described second divider is used for described second direct current signal
with described amplitude signal
be divided by obtain sin (Δ φ), and be sent to inverse sine arithmetical unit;
The signal cos (Δ φ) that described arc cosine arithmetical unit is used for the first divider sends carries out arc cosine computing, obtains the phase difference φ of the orthogonal signal that measured signal and local oscillator export, and signal is sent to the first totalizer;
The signal sin (Δ φ) that described inverse sine arithmetical unit is used for the second divider sends carries out inverse sine computing, obtain the phase difference φ of the orthogonal signal that measured signal and local oscillator export, and signal is sent to respectively the second totalizer and frequency feedback controller;
The phase signal Δ φ that described frequency feedback controller is used for inverse sine arithmetical unit sends is calculated to be frequency difference signal, and FEEDBACK CONTROL local oscillator and measured signal realize phase place and Frequency Synchronization, makes local oscillator follow measured signal change; The signal delta φ that described first totalizer is used for arc cosine arithmetical unit sends adds up, thus obtains the time changeable phases signal of measured signal in real time, and exports;
The signal delta φ that described second totalizer is used for inverse sine arithmetical unit sends adds up, thus obtains the time changeable phases signal of measured signal in real time, and exports:
In an application example:
Simulation low-pass filter is the LFCN-2.5+ passive low ventilating filter that minicircuits company produces, and cutoff frequency is 2.5MHz.
AD converter is the AD9643 that AnalogDevices company produces, and sample frequency 170MSPS, precision is 14.
Phase measurement computing circuit is FPGA mainboard, employing be the KC705 that comparatively ripe Xilinx company produces, fpga chip is the XC7K325T-2FFG900C that Xilinx company produces.
The usb-uart module that signal output communication module adopts Xilinx company to produce, and carry out data communication between computing machine.Correspondingly, the efficient non-blind area digit phase that the utility model example is implemented takes into account algorithm, comprising:
Step 1, the high frequency noise filtering of measured signal to improve the signal to noise ratio (S/N ratio) of measured signal, is obtained simulating signal to be measured, is sent to AD converter by low-pass analog filter;
Step 2, simulating signal to be measured is changed into digital signal to be measured by AD;
Step 3, the original frequency of digital signal to be measured described in phase measurement algorithm circuit measuring, orthogonal signal are produced according to described original frequency, described orthogonal signal and digital signal mixing to be measured, filtering are produced direct current signal, obtain the phase difference φ of measured signal and orthogonal signal again through inverse sine and arc cosine computing, then phase difference φ is sent to described signal output communication module.Wherein step 3 specifically comprises:
The digital signal to be measured that frequency meter described in 3.1 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;
Local oscillator described in 3.2 is used for producing orthogonal sine and cosine signal according to described original frequency, described cosine signal is sent to the first multiplier, described sinusoidal signal is sent to the second multiplier;
The first multiplier described in 3.3 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 and amplitude arithmetical unit;
The second multiplier described in 3.4 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;
Amplitude arithmetical unit described in 3.5, for calculating the amplitude signal of the signal of described first multiplier transmission, is sent to the first divider and the second divider respectively;
The signal filtering that first low-pass filter described in 3.6 is used for the first multiplier to send is the first direct current signal, and is sent to the first divider; Described first divider is used for described first direct current signal and described amplitude signal to be divided by, and is sent to arc cosine arithmetical unit;
The signal filtering that second low-pass filter described in 3.7 is used for the second multiplier to send is the second direct current signal, and is sent to the second divider; Described second divider is used for described second direct current signal and described amplitude signal to be divided by, and is sent to inverse sine arithmetical unit;
The signal that arc cosine arithmetical unit described in 3.8 is used for the first divider sends carries out arc cosine computing, obtains the phase difference φ of the orthogonal signal that measured signal and local oscillator export, and signal is sent to the first totalizer;
The signal that inverse sine arithmetical unit described in 3.9 is used for the second divider sends carries out inverse sine computing, obtains the phase difference φ of the orthogonal signal that measured signal and local oscillator export, and signal is sent to respectively the second totalizer and frequency feedback controller;
The phase signal that frequency feedback controller described in 3.10 is used for inverse sine arithmetical unit sends is calculated to be frequency difference signal, and FEEDBACK CONTROL local oscillator and measured signal realize phase place and Frequency Synchronization, makes local oscillator follow measured signal change;
The signal that first totalizer described in 3.11 is used for arc cosine arithmetical unit sends adds up, thus obtains the time changeable phases signal of measured signal in real time, and exports;
The signal that second totalizer described in 3.12 is used for inverse sine arithmetical unit sends adds up, thus obtains the time changeable phases signal of measured signal in real time, and exports;
Wherein 3.3 and 3.4 parallel carry out, and 3.5,3.6 and 3.7 parallelly carry out, and 3.8,3.9 and 3.10 parallelly carry out, and 3.11 and 3.12 parallelly carry out.
In addition, after step 3, this example also comprises:
Step 4, the phase differential of the orthogonal signal of measured signal and local oscillator is sent to computing machine and other equipment by signal output communication module.
The foregoing is only preferred embodiment 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 made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a non-blind area digit phase counter device is characterized in that comprising low-pass analog filter, AD converter, phase measurement algorithm circuit and signal output communication module; Wherein, described low-pass analog filter is connected with described AD converter, for the high frequency noise filtering by measured signal, to improve the signal to noise ratio (S/N ratio) of measured signal, obtains simulating signal to be measured, is sent to AD converter; Described AD converter is connected with described phase measurement algorithm circuit, for simulating signal to be measured is changed into digital signal to be measured; Described phase measurement algorithm circuit is for measuring the original frequency of described digital signal to be measured, orthogonal signal are produced according to described original frequency, described orthogonal signal and digital signal mixing to be measured, filtering are produced direct current signal, obtain the phase differential △ φ of measured signal and orthogonal signal again through inverse sine and arc cosine computing, and phase differential △ φ is sent to described signal output communication module; Described a kind of non-blind area digit phase counter device also comprises signal output communication module, described signal output communication module is connected with phase measurement algorithm circuit, and the phase differential for the measured signal that obtained by phase measurement algorithm circuit and orthogonal signal is sent to computing machine or miscellaneous equipment.
2. a kind of non-blind area according to claim 1 digit phase counter device, is characterized in that described phase measurement algorithm circuit comprises frequency meter, local oscillator, the first multiplier, the second multiplier, amplitude arithmetical unit, the first low-pass filter, the second low-pass filter, the first divider, the second divider, inverse sine arithmetical unit, arc cosine arithmetical unit, frequency feedback controller, the first totalizer and the second totalizer; 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, the first divider, arc cosine arithmetical unit are connected successively with the first totalizer, second multiplier, the second low-pass filter, the second divider, inverse sine arithmetical unit are connected successively with the second totalizer, and inverse sine arithmetical unit 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; Described local oscillator is used for producing orthogonal sinusoidal signal and cosine signal according to described original frequency, described cosine signal is sent to the first multiplier, described sinusoidal signal is sent to the second multiplier; The first described 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 and amplitude arithmetical unit; The second described 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; Described amplitude arithmetical unit, for calculating the amplitude signal of the signal of described first multiplier transmission, is sent to the first divider and the second divider respectively; The signal filtering that the first described low-pass filter is used for the first multiplier to send is the first direct current signal, and is sent to the first divider; The signal filtering that the second described low-pass filter is used for the second multiplier to send is the second direct current signal, and is sent to the second divider; The first described divider is used for described first direct current signal and described amplitude signal to be divided by, and is sent to arc cosine arithmetical unit; The second described divider is used for the second described direct current signal and described amplitude signal to be divided by, and is sent to inverse sine arithmetical unit; The signal that described arc cosine arithmetical unit is used for the first divider sends carries out arc cosine computing, obtains the phase differential △ φ of the orthogonal signal that measured signal and local oscillator export, and signal is sent to the first totalizer; The signal that described inverse sine arithmetical unit is used for the second divider sends carries out inverse sine computing, obtains the phase differential △ φ of the orthogonal signal that measured signal and local oscillator export, and signal is sent to respectively the second totalizer and frequency feedback controller; The phase signal that described frequency feedback controller is used for inverse sine arithmetical unit sends is calculated to be frequency difference signal, and FEEDBACK CONTROL local oscillator and measured signal realize phase place and Frequency Synchronization, makes local oscillator follow measured signal change; The signal that the first described totalizer is used for arc cosine arithmetical unit sends adds up, thus obtains the time changeable phases signal of measured signal in real time, and exports; The signal that the second described totalizer is used for inverse sine arithmetical unit sends adds up, thus obtains the time changeable phases signal of measured signal in real time, and exports.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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