CN113364509A - PM measurement and control system error-proof locking method and realization circuit thereof - Google Patents

PM measurement and control system error-proof locking method and realization circuit thereof Download PDF

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CN113364509A
CN113364509A CN202110503400.4A CN202110503400A CN113364509A CN 113364509 A CN113364509 A CN 113364509A CN 202110503400 A CN202110503400 A CN 202110503400A CN 113364509 A CN113364509 A CN 113364509A
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frequency
signal
phase
module
locked
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CN113364509B (en
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杜检来
张慧
熊勇华
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Shanghai Aerospace Electronics Co ltd
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Shanghai Aerospace Electronics Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18519—Operations control, administration or maintenance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
    • H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop

Abstract

The invention provides a PM measurement and control system error-proof locking method, which adopts a phase-locked loop to capture and track a PM signal, and comprises S1 and an initial capture stage, wherein the phase-locked loop initially captures and records a frequency value f of the current stateIFAnd a corresponding energy value E1; s2, starting an auxiliary energy calculation module, setting the local carrier frequency as fIF+fTMRecording energy value E2; s3, repeating the step 2, and sequentially setting the local carrier frequency as fIF+2fTM，fIF‑fTM，fIF‑2fTMRecording energy values E3, E4, E5, respectively; s4, respectively calculating | E5-E1|, | E4-E2|, and | E3-E1|, and then performing numerical comparison; s5, mixing foutThe current frequency of the phase locked loop is set. The invention fully utilizes the PM signal frequency spectrum symmetry, takes the robustness, reliability and complexity requirements of the system into consideration, and can reduce the constraint requirement of transmitting the PM signal on the ground.

Description

PM measurement and control system error-proof locking method and realization circuit thereof
Technical Field
The invention relates to the field of satellite measurement and control communication, in particular to a PM measurement and control system error-locking prevention method and an implementation circuit thereof.
Background
A unified S frequency band (USB) measurement and control system, a unified C frequency band (UCB) measurement and control system and a unified X frequency band (UXB) measurement and control system are general measurement and control systems in the CCSDS standard. Due to high maturity and low implementation complexity, the method is widely applied to the current satellite measurement and control systems, particularly civil aerospace measurement and control systems and deep space measurement and control systems.
The physical layers of the USB, UCB, and UXB measurement and control systems all adopt a PM (Phase modulation) modulation mode, and the amplitude-frequency characteristics of the signals are represented by even symmetry with the residual carrier as the center, and the frequency spectrums of the remote control subcarrier and the sounding carrier are arranged on both sides of the residual carrier, as shown in fig. 1. Common methods for acquisition of PM signals include FFT assisted acquisition methods and phase locked loop waiting to acquire tracking methods.
The phase-locked loop waiting capturing tracking method is simple to realize and is a capturing method which is very common in application, but the processing mode is carried out in a time domain, the characteristic of symmetrical frequency spectrum of PM signals cannot be utilized, and when the residual carrier and the remote control subcarrier signals are simultaneously modulated, signals are easily locked to the subcarriers in a wrong mode; meanwhile, when the modulation degree of the remote control subcarrier is large, the energy of the remote control subcarrier is stronger than the residual carrier capacity, and the abnormal working of a signal capturing loop can also be caused. In actual working scenes, the two situations are possible, so that measures need to be taken to enable the PM signals to be captured correctly and avoid wrong working states.
Disclosure of Invention
The invention aims to provide a PM measurement and control system error-locking prevention method and a realization circuit thereof, which are used for calculating the energy of a phase-locked loop tracking signal by utilizing the characteristic of the frequency spectrum symmetry of a PM signal and acquiring the left-right frequency difference of the tracking signal of the phase-locked loop as fTM、2fTMAnd performing energy detection on the frequency band, and correctly identifying the residual carrier signal and ensuring that the signal is normally received by using the 5 detected energy values.
In order to solve the technical problems, the technical scheme of the invention is as follows: the method for preventing error locking of the PM measurement and control system is provided, a phase-locked loop is adopted to capture and track PM signals, and the method comprises the following steps:
s1, capturing the initial stage, when the PM signal falls into the quick capture band of the phase-locked loop and meets the judgment threshold, completing the initial capture of the phase-locked loop, and recording the frequency value f of the current stateIFAnd a corresponding energy value E1;
s2, after the phase-locked loop is successfully captured initially, starting the auxiliary energy calculation module and placingLocal carrier frequency of fIF+fTMWherein f isTMIs a remote control subcarrier frequency; recording an energy value E2 after down-conversion and filtering;
s3, repeating the step 2, and sequentially setting the local carrier frequency as fIF+2fTM，fIF-fTM，fIF-2fTMRecording energy values E3, E4, E5, respectively;
s4, accurately judging the residual carrier wave by utilizing the energy symmetry of the PM signal and preventing the signal from being locked by mistake; respectively calculating | E5-E1|, | E4-E2|, and | E3-E1|, and comparing numerical values, and when | E5-E1| is minimum, setting fout＝fIF-fTM(ii) a When | E4-E2| is minimum, put fout＝fIF(ii) a When | E3-E1| is minimum, put fout＝fIF+fTM；
S5, f obtained in the step S4outAnd setting the current frequency of the phase-locked loop, and finishing the acquisition tracking of the signal by the phase-locked loop again.
Another technical scheme of the present invention provides a circuit for implementing the error locking prevention method for the PM measurement and control system, including an a/D conversion module, a first frequency mixing module, a first low-pass filtering module, a phase-locked tracking loop, a controller, a first energy calculation module, an auxiliary energy calculation module, and a comparator; the auxiliary energy calculation module comprises a second mixing module, a second low-pass filtering module and a second energy calculation module
The A/D conversion module converts the input intermediate frequency signal into a sampled digital signal through A/D conversion for subsequent processing; the first frequency mixing module receives an intermediate frequency signal from the A/D conversion module, and multiplies the intermediate frequency signal by a sine/cosine signal generated by a phase-locked tracking loop to obtain an orthogonal I path signal and an orthogonal Q path signal; the first low-pass filtering is used for carrying out low-pass filtering on the signals of the I path and the Q path output by the first frequency mixing module, filtering out high-frequency signals after frequency mixing, and simultaneously reserving useful signals such as remote control subcarriers, sound measuring signals and the like;
the phase-locked tracking loop performs phase discrimination and loop filtering according to orthogonal I-path and Q-path signals to ensure that the local frequency and the phase of the phase-locked tracking loop are consistent with the input intermediate frequency signal,and outputting the phase-locked indication LOCK signal of the loop and the frequency f of the local carrierlocal(ii) a The first energy calculating module 1 calculates the energy E1 of the residual carrier when the phase-locked loop is locked; when the phase-locked loop is locked, the controller module starts the auxiliary energy calculation module;
the second frequency mixing module receives the intermediate frequency signal from the A/D conversion module, and multiplies the intermediate frequency signal by a sine/cosine signal obtained by the output frequency of the controller to obtain an orthogonal I signal and an orthogonal Q signal; the second low-pass filtering is used for carrying out low-pass filtering on the signals of the I path and the Q path output by the frequency mixing module 1 and filtering out the high-frequency signals and the subcarrier signals after frequency mixing; the second energy calculation module calculates an energy value of the corresponding central frequency signal according to the I path signal and the Q path signal obtained by the second low-pass filtering; the comparator module calculates the numerical values of | E5-E1|, | E4-E2|, | E3-E1 |; when | E5-E1| is minimum, put fout＝fIF-fTM(ii) a When | E4-E2| is minimum, put fout＝fIF(ii) a When | E3-E1| is minimum, put fout＝fIF+fTM(ii) a Will f isoutSetting the current frequency of the phase-locked tracking loop, and completing the error-proof lock capturing and tracking of the whole PM measurement and control system signal after the phase-locked tracking loop completes locking again.
Further, the phase-locked tracking loop adopts a costas loop.
Further, the controller module is divided into 5 steps:
step 1: setting the local carrier frequency of the auxiliary energy calculation module to be fIF+fTMCalculating corresponding residual carrier energy E2;
step 2: setting the local carrier frequency of the auxiliary energy calculation module to be fIF+2fTMCalculating corresponding residual carrier energy E3;
and step 3: setting the local carrier frequency of the auxiliary energy calculation module to be fIF-fTMCalculating corresponding residual carrier energy E4;
and 4, step 4: setting the local carrier frequency of the auxiliary energy calculation module to be fIF-2fTMCalculating corresponding residual carrier energy E5;
and 5: and driving a comparator module to obtain the final residual carrier frequency according to the energy values obtained in the steps 1 to 4.
The error locking prevention method of the PM measurement and control system and the realization circuit thereof provided by the invention fully utilize the PM signal frequency spectrum symmetry, can effectively prevent the loop from being locked on the error frequency by mistake by only adding a small amount of circuits, give consideration to the requirements of the robustness, the reliability and the complexity of the system, and can reduce the constraint requirement of transmitting the PM signal on the ground.
Drawings
The invention is further described with reference to the accompanying drawings:
FIG. 1 is a schematic amplitude-frequency diagram of a PM signal;
fig. 2 is a circuit for implementing the error locking prevention method of the PM measurement and control system according to the embodiment of the present invention.
Detailed Description
The PM measurement and control system error-locking prevention method and the implementation circuit thereof proposed by the present invention are further described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise ratio for the purpose of facilitating and distinctly aiding in the description of the embodiments of the invention.
The core idea of the invention is that the error locking prevention method of the PM measurement and control system and the realization circuit thereof provided by the invention make full use of the PM signal frequency spectrum symmetry, can effectively prevent the loop from being locked on the error frequency by mistake only by adding a small amount of circuits, give consideration to the requirements of robustness, reliability and system complexity of the system, and can reduce the constraint requirement of transmitting PM signals on the ground.
Example 1
The error-locking prevention method for the PM measurement and control system provided by the embodiment comprises the following steps:
s1, capturing the initial stage, when the PM signal falls into the quick capture band of the phase-locked loop and meets the judgment threshold, completing the initial capture of the phase-locked loop, and recording the frequency value f of the current stateIFAnd a corresponding energy value E1;
s2 phase-locked loopAfter the initial capture is successful, starting an auxiliary energy calculation module, and setting the local carrier frequency as fIF+fTMWherein f isTMIs a remote control subcarrier frequency; recording an energy value E2 after down-conversion and filtering;
s3, repeating the step 2, and sequentially setting the local carrier frequency as fIF+2fTM，fIF-fTM，fIF-2fTMRecording energy values E3, E4, E5, respectively;
s4, accurately judging the residual carrier wave by utilizing the energy symmetry of the PM signal and preventing the signal from being locked by mistake; respectively calculating | E5-E1|, | E4-E2|, and | E3-E1|, and comparing numerical values, and when | E5-E1| is minimum, setting fout＝fIF-fTM(ii) a When | E4-E2| is minimum, put fout＝fIF(ii) a When | E3-E1| is minimum, put fout＝fIF+fTM；
S5, f obtained in the step S4outAnd setting the current frequency of the phase-locked loop, and finishing the acquisition tracking of the signal by the phase-locked loop again.
Example 2
Fig. 2 is a block diagram of an implementation of the error-locking prevention algorithm of the PM measurement and control system of the present invention, which includes: A/D conversion, frequency mixing 1, low-pass filtering 1, a phase-locked tracking loop, a controller, energy calculation 1, frequency mixing 2, low-pass filtering 2, energy calculation 2 and a comparator.
1. An A/D conversion module: converting the input intermediate frequency signal into a sampled digital signal for subsequent processing after A/D conversion;
2. the frequency mixing module 1: receiving an intermediate frequency signal from an A/D conversion module, and multiplying the intermediate frequency signal by a sine/cosine signal generated by a phase-locked tracking loop to obtain an orthogonal I path signal and an orthogonal Q path signal;
3. low-pass filtering 1: low-pass filtering is carried out on the signals of the I path and the Q path output by the frequency mixing module 1, high-frequency signals after frequency mixing are filtered out, and useful signals such as remote control subcarriers, sound measuring signals and the like are reserved;
4. phase-locked tracking loop: the phase discrimination and loop filtering can be carried out by adopting a traditional costas loop according to orthogonal I-path and Q-path signals, so that the phase-locked tracking loopThe local frequency and the phase are consistent with the input intermediate frequency signal; and outputting the phase-locked indication LOCK signal of the loop and the frequency f of the local carrierlocal。
5. The energy calculation module 1: when the phase-locked loop is locked (phase-locked indication LOCK ═ 1), the energy E1 of the residual carrier is calculated. It should be noted that the energy calculation process needs to filter out the influence of the subcarriers.
6. A controller module: when the phase-locked loop is locked (LOCK is indicated to be 1), the controller module starts the auxiliary energy calculation module. The controller module is divided into 5 steps:
step 1: setting the local carrier frequency of the auxiliary energy calculation module to be fIF+fTMCalculating corresponding residual carrier energy E2;
step 2: setting the local carrier frequency of the auxiliary energy calculation module to be fIF+2fTMCalculating corresponding residual carrier energy E3;
and step 3: setting the local carrier frequency of the auxiliary energy calculation module to be fIF-fTMCalculating corresponding residual carrier energy E4;
and 4, step 4: setting the local carrier frequency of the auxiliary energy calculation module to be fIF-2fTMCalculating corresponding residual carrier energy E5;
and 5: and driving a comparator module to obtain the final residual carrier frequency according to the energy values obtained in the steps 1 to 4.
7. And the frequency mixing module 2: receiving an intermediate frequency signal from an A/D conversion module, and multiplying the intermediate frequency signal by a sine/cosine signal obtained by the output frequency of a controller to obtain an orthogonal I path signal and an orthogonal Q path signal;
8. and (3) low-pass filtering 2: low-pass filtering is carried out on the signals of the I path and the Q path output by the frequency mixing module 1, and high-frequency signals and subcarrier signals after frequency mixing are filtered;
9. the energy calculation module 2: calculating an energy value corresponding to the central frequency signal according to the I path signal and the Q path signal obtained by the low-pass filtering 2;
10. a comparator module: numerical values of | E5-E1|, | E4-E2|, and | E3-E1| are calculated. When | E5-E1| is minimum, put fout＝fIF-fTM(ii) a When | E4-E2| is minimum, put fout＝fIF(ii) a When | E3-E1| is minimum, put fout＝fIF+fTM(ii) a Will f isoutSetting the current frequency of the phase-locked tracking loop, and completing the error-proof lock capturing and tracking of the whole PM measurement and control system signal after the phase-locked tracking loop completes locking again.
Those not described in detail in this specification are within the skill of the art. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (4)

  1. The error-locking prevention method of the PM measurement and control system adopts a phase-locked loop to capture and track PM signals, and is characterized by comprising the following steps:
    s1, capturing the initial stage, when the PM signal falls into the quick capture band of the phase-locked loop and meets the judgment threshold, completing the initial capture of the phase-locked loop, and recording the frequency value f of the current stateIFAnd a corresponding energy value E1;
    s2, after the phase-locked loop is captured successfully, starting the auxiliary energy calculation module, and setting the local carrier frequency to be fIF+fTMWherein f isTMIs a remote control subcarrier frequency; recording an energy value E2 after down-conversion and filtering;
    s3, repeating the step 2, and sequentially setting the local carrier frequency as fIF+2fTM，fIF-fTM，fIF-2fTMRecording energy values E3, E4, E5, respectively;
    s4, accurately judging the residual carrier wave by utilizing the energy symmetry of the PM signal and preventing the signal from being locked by mistake; respectively calculate | E5-E1|, | E4-E2|, | E3 |)E1|, and comparing the values, and when | E5-E1| is minimum, setting fout＝fIF-fTM(ii) a When | E4-E2| is minimum, put fout＝fIF(ii) a When | E3-E1| is minimum, put fout＝fIF+fTM；
    S5, f obtained in the step S4outAnd setting the current frequency of the phase-locked loop, and finishing the acquisition tracking of the signal by the phase-locked loop again.
  2. 2. The circuit for implementing the error-locking prevention method of the PM measurement and control system according to claim 1, comprising an A/D conversion module, a first frequency mixing module, a first low-pass filtering module, a phase-locked tracking loop, a controller, a first energy calculation module, an auxiliary energy calculation module and a comparator; the auxiliary energy calculation module comprises a second mixing module, a second low-pass filtering module and a second energy calculation module
    The A/D conversion module converts the input intermediate frequency signal into a sampled digital signal through A/D conversion for subsequent processing; the first frequency mixing module receives an intermediate frequency signal from the A/D conversion module, and multiplies the intermediate frequency signal by a sine/cosine signal generated by a phase-locked tracking loop to obtain an orthogonal I path signal and an orthogonal Q path signal; the first low-pass filtering is used for carrying out low-pass filtering on the signals of the I path and the Q path output by the first frequency mixing module, filtering out high-frequency signals after frequency mixing, and simultaneously reserving useful signals such as remote control subcarriers, sound measuring signals and the like;
    the phase-locked tracking loop performs phase discrimination and loop filtering according to orthogonal I-path and Q-path signals, so that the local frequency and phase of the phase-locked tracking loop are consistent with those of the input intermediate frequency signal, and the phase-locked indication LOCK signal of the output loop and the frequency f of the local carrier wavelocal(ii) a The first energy calculating module 1 calculates the energy E1 of the residual carrier when the phase-locked loop is locked; when the phase-locked loop is locked, the controller module starts the auxiliary energy calculation module;
    the second frequency mixing module receives the intermediate frequency signal from the A/D conversion module, and multiplies the intermediate frequency signal by a sine/cosine signal obtained by the output frequency of the controller to obtain an orthogonal I signal and an orthogonal Q signal; the second low-pass filtering pair frequency mixing modeI path and Q path signals output by the block 1 are subjected to low-pass filtering, and high-frequency signals and subcarrier signals after frequency mixing are filtered; the second energy calculation module calculates an energy value of the corresponding central frequency signal according to the I path signal and the Q path signal obtained by the second low-pass filtering; the comparator module calculates the numerical values of | E5-E1|, | E4-E2|, | E3-E1 |; when | E5-E1| is minimum, put fout＝fIF-fTM(ii) a When | E4-E2| is minimum, put fout＝fIF(ii) a When | E3-E1| is minimum, put fout＝fIF+fTM(ii) a Will f isoutSetting the current frequency of the phase-locked tracking loop, and completing the error-proof lock capturing and tracking of the whole PM measurement and control system signal after the phase-locked tracking loop completes locking again.
  3. 3. The circuit for implementing the error-locking prevention method of the PM measurement and control system according to claim 2, wherein the phase-locked tracking loop employs a costas loop.
  4. 4. The circuit for implementing the error-locking prevention method of the PM measurement and control system according to claim 2, wherein the controller module is divided into 5 steps:
    step 1: setting the local carrier frequency of the auxiliary energy calculation module to be fIF+fTMCalculating corresponding residual carrier energy E2;
    step 2: setting the local carrier frequency of the auxiliary energy calculation module to be fIF+2fTMCalculating corresponding residual carrier energy E3;
    and step 3: setting the local carrier frequency of the auxiliary energy calculation module to be fIF-fTMCalculating corresponding residual carrier energy E4;
    and 4, step 4: setting the local carrier frequency of the auxiliary energy calculation module to be fIF-2fTMCalculating corresponding residual carrier energy E5;
    and 5: and driving a comparator module to obtain the final residual carrier frequency according to the energy values obtained in the steps 1 to 4.
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