WO2008006242A1 - Procédé et dispositif de détection d'une phase à haute précision - Google Patents

Procédé et dispositif de détection d'une phase à haute précision Download PDF

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Publication number
WO2008006242A1
WO2008006242A1 PCT/CN2006/001555 CN2006001555W WO2008006242A1 WO 2008006242 A1 WO2008006242 A1 WO 2008006242A1 CN 2006001555 W CN2006001555 W CN 2006001555W WO 2008006242 A1 WO2008006242 A1 WO 2008006242A1
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WO
WIPO (PCT)
Prior art keywords
frequency
phase
difference
digital
difference frequency
Prior art date
Application number
PCT/CN2006/001555
Other languages
English (en)
Chinese (zh)
Inventor
Shijun Guan
Original Assignee
Zte Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zte Corporation filed Critical Zte Corporation
Priority to PCT/CN2006/001555 priority Critical patent/WO2008006242A1/fr
Publication of WO2008006242A1 publication Critical patent/WO2008006242A1/fr

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
    • G01R25/005—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller, or for passing one of the input signals as output signal

Definitions

  • the invention relates to the field of time frequency measurement and control, in particular to a high precision phase detecting device capable of performing precise phase measurement, precise phase shifting and precise phase tracking. Background technique
  • Phase detectors that are currently in common use include analog phase detectors and digital phase detectors.
  • the analog phase detector is responsive but not precise.
  • a typical digital phase detector produces a phase error level from two phase-detected frequencies, which is counted using a relatively high frequency.
  • the phase discrimination accuracy is limited by the counting frequency, and it is difficult to increase the phase discrimination accuracy by an order of magnitude by using the multi-phase counting method. Therefore, improvements need to be made on the basis of existing phase detectors to increase the order of magnitude of phase discrimination accuracy.
  • Invention disclosure
  • the technical problem to be solved by the present invention is to provide a method and apparatus for high-precision phase discrimination, which solves the problem that the existing phase detector cannot greatly improve the phase discrimination accuracy.
  • the present invention provides a method for phase discrimination with high precision, which is characterized in that it comprises the following steps:
  • Step one taking one of the two equal phase discrimination frequencies participating in the phase discrimination as a reference frequency, and applying an offset to the reference frequency by using a frequency modulator to obtain a new reference frequency;
  • Step two using two digital mixers to respectively calculate the difference between the two phase-detecting frequencies and the new reference frequency, respectively obtaining a first difference frequency and a second difference frequency;
  • Step 3 using a digital phase detector to obtain a digital phase difference between the first difference frequency and the second difference frequency;
  • Step 4 performing calculation processing on the digitized phase difference by using an arithmetic unit to obtain high-precision digitization of the two phase-detecting frequencies difference.
  • the above method is characterized in that, before the step three, the step of filtering the glitch of the first difference frequency and the second difference frequency by using a burr filter is further included.
  • the above method is characterized in that, in the step (3), the digital phase detector obtains the digitized phase difference by generating phase difference levels of the first difference frequency and the second difference frequency and performing counting.
  • the above method is characterized by a field programmable gate array or a dedicated direct digital frequency
  • the synthesis chip is implemented to implement the frequency modulator described.
  • the above method is characterized in that the digital mixer is implemented by a D flip-flop.
  • the present invention also provides an apparatus for high-precision phase discrimination, which comprises: a frequency modulator, two digital mixers, a digital phase detector, and an arithmetic a unit; the frequency modulator is respectively connected to the two digital mixers, the two digital mixers are connected to the digital phase detector, the digital phase detector is connected to the arithmetic unit;
  • the deflector is configured to take one of the two equal phase discrimination frequencies participating in the phase discrimination as a reference frequency, and add an offset to the reference frequency to obtain a new reference frequency;
  • the two digital mixers are used And respectively, the two phase-detecting frequencies are respectively frequency-divided with the new reference frequency to obtain a first difference frequency and a second difference frequency, respectively; the digital phase detector is configured to obtain the first difference frequency and the first The digitization of the two difference frequencies is performed;
  • the arithmetic unit is configured to perform a calculation process on the digitized phase difference to obtain a high-precision digitization phase difference of the two phase-
  • the above device is characterized in that it further comprises two bristles filter respectively connected between the digital phase detector and the two digital mixers for filtering the first difference frequency sum
  • the second difference frequency is the donkey.
  • the above device is characterized in that the frequency modulator is a field programmable gate array or a dedicated direct digital frequency synthesis chip.
  • the above device is characterized in that the digital mixer is a D flip-flop.
  • the invention has the advantages that: the invention overcomes the disadvantages of increasing the counting frequency and increasing the number of phases of the counting frequency in the prior art, and solves the problem that the phase discrimination accuracy cannot be greatly improved in the prior art. With the device of the present invention, the effect of greatly improving the phase discrimination accuracy is achieved as compared with the prior art.
  • FIG. 1 is a block diagram of a high precision phase detector provided by the present invention.
  • Figure 2 is a structural view of a frequency modulator in the present invention
  • Figure 3 is a structural diagram of a digital mixer in the present invention.
  • FIG. 4 is a flow chart of the steps of the method of the present invention. The best way to implement the invention
  • 1 is a block diagram of a high precision phase detector provided by the present invention.
  • the frequency modulator 100 connects the two digital mixers 110, 120, and then connects the two capillary filters 130, 140, respectively, and finally connects the phase detector 150 and the arithmetic unit 160.
  • the high-precision phase detector of the invention realizes high-precision phase-detection function for two co-frequency signals, and performs precise phase-detection of Fl and F2 in the drawing.
  • Request F1 F2.
  • Fr can be served by F1 or F2.
  • the frequency modulator 100 can be implemented using a DDS (Direct Digital Frequency Synthesis) scheme that adjusts the frequency by adjusting the frequency control word of the DDS.
  • DDS can be implemented with an FPGA (Field Programmable Gate Array) or a dedicated DDS chip.
  • the FPGA requires an AD conversion device.
  • a high-Q bandpass filter (which can use a crystal filter) is used to filter the frequency of the DDS synthesis, and then the shaping circuit is used to become a square wave.
  • the frequency modulator implemented by FPGA is as shown in FIG. 2, and the DDS 101 is connected to a digital-to-analog conversion (DAC) 102, a band pass filter (BPF) 103, and a shaping circuit 104.
  • DAC digital-to-analog conversion
  • BPF band pass filter
  • the digital mixers 120, 130 can be implemented by a D flip-flop.
  • FIG. 3 is a structural diagram of the digital mixer in the present invention. As shown in FIG. 3, the two frequencies participating in the mixing are respectively connected to the D trigger. At the D and CLK terminals of the device, their difference frequency can be obtained at the output terminal Q.
  • the mixing principle is derived as follows:
  • Fr' Due to the frequency difference between Fr' and F1, Fr' has a phase shift with respect to time, Fr, a high level for F1 high-level half-cycle sampling, Fr, low level for F1
  • the half-cycle sampling outputs a low level
  • Fr' outputs a one-cycle signal after one week of moving with F1.
  • Fr' is constantly moving relative to F1, and a periodic signal F1 is generated at the output of the D flip-flop.
  • the periods of Fr, Fl, and Fl are denoted as, respectively, T F1 , T F1 , .
  • the burr filters 130, 140 filter out the burrs on F1, F2' by counting, and the counting frequency here can be taken by Fr. Pulses narrower than several Fr periods can be filtered out. Set the appropriate count value according to the size of Fr and adjust the width of the filter. Its width is less than 1 I 2T F1 .
  • the digital phase detector 150 is realized by an FPGA, and uses a rising edge of Fl' and F2' as a switching signal to generate a phase difference level, and then uses a high frequency signal such as Fr to count the phase difference level to obtain a digitization of F1 ', F2'. difference.
  • the arithmetic unit 160 is here a divider whose function is to divide the digital phase difference of Fl ', F2' by (Fr / A F) to obtain a high-precision digitized phase difference between Fl and F2.
  • Step 401 Take one of two equal phase discrimination frequencies participating in the phase discrimination as a reference frequency, and use a frequency modulator to give Adding an offset to the reference frequency to obtain a new reference frequency;
  • Step 402 using two digital mixers to respectively obtain the difference between the two phase-detection frequencies and the new reference frequency, and obtain a first difference frequency and a second difference frequency respectively;
  • Step 403 Filter the glitch of the first difference frequency and the second difference frequency by using a glitch filter;
  • Step 404 Obtain a digital phase difference between the first difference frequency and the second difference frequency by using a digital phase detector;
  • Step 405 And calculating, by using an arithmetic unit, the digitized phase difference to obtain a high-precision digitized phase difference of the two phase-detecting frequencies.
  • phase discrimination accuracy can be greatly improved. For example, if Fr takes 10MHz and takes 10Hz, the phase discrimination accuracy is 106 times higher than that of the ordinary phase detector.
  • the method of the invention improves on the basis of the existing phase detector, overcomes the disadvantages of increasing the counting frequency and increasing the number of phases of the counting frequency in the prior art, and solves the problem that the existing technology cannot be greatly improved.
  • the problem of phase discrimination accuracy With the device of the present invention, the effect of greatly improving the phase discrimination accuracy is achieved as compared with the prior art.
  • the method and apparatus of the present invention are used in the field of time-frequency measurement and control, and are suitable for technical applications of precision phase measurement, precise phase shifting, and precise phase tracking.
  • the method and apparatus of the present invention are also suitable for other fields where similar time-frequency measurement and control requirements exist.

Landscapes

  • Measuring Phase Differences (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

L'invention concerne un procédé et un dispositif de détection d'une phase à autre précision. Une des deux fréquences de détection de phase équivalente est sélectionnée comme fréquence de référence, dont les phases vont tre détectées, puis un décalage est ajouté à la fréquence de référence au moyen d'une cellule destinée à désaccorder la fréquence afin d'obtenir une nouvelle fréquence de référence. La différence de fréquence est obtenue par comparaison respective des deux fréquences de détection de phase à la nouvelle fréquence de référence au moyen de deux mélangeurs numériques de manière à obtenir une première fréquence de différence et une seconde fréquence de différence. La différence de phase numérique de la première fréquence de différence et de la seconde fréquence de différence est obtenue au moyen d'un détecteur de phase numérique. La fréquence de phase numérique des deux fréquences de détection de phase à haute précision est obtenue par le calcul de la différence de phase numérique au moyen d'une unité arithmétique. La précision de la détection de phase peut être considérablement améliorée selon la présente invention.
PCT/CN2006/001555 2006-07-04 2006-07-04 Procédé et dispositif de détection d'une phase à haute précision WO2008006242A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2006/001555 WO2008006242A1 (fr) 2006-07-04 2006-07-04 Procédé et dispositif de détection d'une phase à haute précision

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2006/001555 WO2008006242A1 (fr) 2006-07-04 2006-07-04 Procédé et dispositif de détection d'une phase à haute précision

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WO2008006242A1 true WO2008006242A1 (fr) 2008-01-17

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113848384A (zh) * 2021-09-22 2021-12-28 浙江大学 一种基于鉴频鉴相器的高精度反馈式频率测量装置及方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2048977U (zh) * 1989-03-15 1989-12-06 西安电子科技大学 线性比相仪
CN1134068A (zh) * 1995-01-19 1996-10-23 日本无线株式会社 延迟检测电路及低噪音振荡电路
CN1617451A (zh) * 2003-11-15 2005-05-18 华为技术有限公司 数字鉴相器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2048977U (zh) * 1989-03-15 1989-12-06 西安电子科技大学 线性比相仪
CN1134068A (zh) * 1995-01-19 1996-10-23 日本无线株式会社 延迟检测电路及低噪音振荡电路
CN1617451A (zh) * 2003-11-15 2005-05-18 华为技术有限公司 数字鉴相器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113848384A (zh) * 2021-09-22 2021-12-28 浙江大学 一种基于鉴频鉴相器的高精度反馈式频率测量装置及方法

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