CN113179102B - Method and system for removing interference of signal - Google Patents
Method and system for removing interference of signal Download PDFInfo
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- CN113179102B CN113179102B CN202110356424.1A CN202110356424A CN113179102B CN 113179102 B CN113179102 B CN 113179102B CN 202110356424 A CN202110356424 A CN 202110356424A CN 113179102 B CN113179102 B CN 113179102B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
Abstract
The application discloses a method and a system for removing interference of signals, wherein the method comprises the following steps: acquiring an initial output signal; carrying out frequency conversion processing on the initial output signal; performing phase shift processing on the initial output signal; acquiring an output signal after frequency conversion and phase shift processing; when the deviation of the output signal after the frequency conversion phase shift processing and the initial output signal is not in the preset range, repeating the frequency conversion step, the phase shift step and the judgment step until the deviation of the output signal after the frequency conversion phase shift processing and the previous output signal is in the preset range; before the next frequency conversion step and phase shift step start, recording an output signal after the previous frequency conversion and phase shift as an initial output signal; when the deviation between the output signal after the frequency conversion phase shift processing and the initial output signal is within a preset range, outputting the signal after the frequency conversion phase shift processing; through the scheme, the interference signals can be removed through frequency conversion phase shift processing, and the accuracy of the output signals is ensured.
Description
Technical Field
The present application relates to the field of photoelectric sensors, and in particular, to a method and system for removing interference from a signal.
Background
The optical signal emitted by the photoelectric sensor enters a receiving circuit of the sensor after being reflected on the detected object, and then whether the detected object exists or not is judged according to the amplitude of the signal. When the set value is determined by the externally adjusted electrical parameter or the displacement of the receiving lens, the received signal is compared with the set value, so that the position of the detected object can be determined. When an interference signal is received, the position of the detected object cannot be accurately determined due to the amplitude and phase changes of the received signal caused by the superposition of the interference signal, and therefore, how to remove the interference of the photoelectric conversion signal is an urgent problem to be solved.
Disclosure of Invention
The purpose of the application is to remove interference when detecting photoelectric conversion signals.
The technical purpose of the application is realized by the following technical scheme: a method for signal interference cancellation, comprising:
a sampling step, namely acquiring an initial output signal;
a frequency conversion processing step, wherein the frequency conversion processing is carried out on the initial output signal;
a phase-shifting step, in which the initial output signal is phase-shifted;
a secondary sampling step, namely acquiring output signals after frequency conversion and phase shift processing;
a correcting step, namely when the deviation of the output signal after the frequency conversion phase shift processing and the initial output signal is not in a preset range, repeating the frequency conversion step, the phase shift step and the judging step until the deviation of the output signal after the frequency conversion phase shift processing and the previous output signal is in the preset range; before the next frequency conversion step and phase shift step start, recording the output signal after the previous frequency conversion and phase shift as an initial output signal;
and an output step, when the deviation between the output signal after the frequency conversion phase shift processing and the initial output signal is within a preset range, outputting the signal after the frequency conversion phase shift processing.
According to the technical scheme, through the first sampling, acquire initial output signal, carry out frequency conversion and phase shift to initial output signal, sample the output signal after handling again, compare twice signal, if twice signal deviation is in predetermineeing the within range, then show, output signal does not receive the interference, carry out signal output, and when twice signal deviation exceedes predetermined scope, then set the output signal after the frequency conversion phase shift as initial signal, and continue to carry out the frequency conversion phase shift and handle, when adjacent twice signal output does not have great deviation, show that interference signal has got rid of, output ultimate output signal this moment, through above-mentioned scheme, can get rid of the interference, guarantee output signal's accuracy.
Optionally, the method for removing interference from a signal, where the frequency conversion step includes:
and when the output signal is detected to be required to be overturned, acquiring parameters of frequency conversion processing and phase shift processing.
According to the technical scheme, when the signal is detected to be required to be overturned, the parameters of frequency conversion phase shift processing are obtained, and intelligent control is achieved.
Optionally, the method for removing interference from a signal, where it is detected that an output signal needs to be inverted, and the method for obtaining parameters of frequency conversion processing and phase shift processing includes:
setting a counter to count, wherein the counter counts at least once in a sampling period;
reading the counter when detecting that the output signal needs to be turned over;
and acquiring parameters of frequency conversion processing and phase shift processing corresponding to the counter.
According to the technical scheme, when the counter is set, the output signal is detected to be required to be turned over in a sampling period, namely when the signal is output, the counter is read, the frequency conversion processing and the phase shift processing parameters corresponding to the counting of the counter are obtained, the frequency conversion processing and the phase shift processing are carried out, the influence of human factors is reduced through a random mode, and the precision is guaranteed.
Optionally, in the method for removing interference from a signal, the parameter of the frequency conversion processing is an output frequency, and the parameter of the phase shift processing is a phase shift time.
According to the technical scheme, the frequency conversion processing mainly changes the output frequency, and the phase shift processing mainly changes the phase shift time, so that the interference of other signals is conveniently removed.
Optionally, the method for removing interference from the signal, wherein the frequency conversion step includes:
and based on the frequency needing frequency conversion processing, giving a timing value corresponding to the frequency to a timer for controlling transmission, restarting the timer, and executing a transmission task according to the new timing value.
According to the technical scheme, the frequency conversion processing is realized by reversely deducing a timing value corresponding to the frequency to a timer for controlling the emission of the output signal through the selected frequency and executing an emission task according to a new timing value.
Optionally, the method for removing interference from a signal, where the phase shifting step includes:
and controlling the transmitting time to delay according to the phase shifting time based on the phase shifting time, restarting the timer, and performing phase shifting processing on the output signal.
According to the technical scheme, the phase shift processing is performed through the selected phase shift time, the corresponding control transmitting time is delayed according to the phase shift time, the timer is restarted, the phase shift processing of the output signal is realized, the interference can be reduced to a certain extent through the output signal after the frequency conversion phase shift processing, the interference can be completely removed through the frequency conversion phase shift processing for multiple times, and the accuracy of signal output is ensured.
Optionally, the present application further discloses a system for removing interference from a signal, where the system includes:
the sampling module is used for acquiring an initial output signal;
the frequency conversion processing module is used for carrying out frequency conversion processing on the initial output signal;
the phase-shifting processing module is used for performing phase-shifting processing on the initial output signal;
the secondary sampling module is used for acquiring output signals after frequency conversion and phase shift processing;
the correcting module is used for repeating the frequency conversion step, the phase shifting step and the judging step when the deviation of the output signal after the frequency conversion phase shifting processing and the initial output signal is not in the preset range until the deviation of the output signal after the frequency conversion phase shifting processing and the previous output signal is in the preset range; before the next frequency conversion step and phase shift step start, recording an output signal after the previous frequency conversion and phase shift as an initial output signal;
and the signal output module is used for outputting the signals after the frequency conversion phase shift processing when the deviation between the output signals after the frequency conversion phase shift processing and the initial output signals is within a preset range.
This application above-mentioned technical scheme, through first sampling, acquire initial output signal, carry out frequency conversion and phase shift to initial output signal and handle, output signal after handling is sampled again, compare twice signal, if twice signal deviation is in predetermineeing the within range, then show, output signal does not receive the interference, carry out signal output, and when twice signal deviation exceedes predetermineeing the scope, then set the output signal after the frequency conversion phase shift as initial signal, and continue to carry out frequency conversion and phase shift and handle, when signal output until adjacent twice does not have great deviation, show that interference signal has been removed, output ultimate output signal this moment, through above-mentioned scheme, can get rid of the interference, guarantee output signal's accuracy
Optionally, the system for removing interference by using a signal further includes:
and the parameter acquisition module is used for acquiring parameters of frequency conversion processing and phase shift processing when the output signal is detected to be required to be overturned.
According to the technical scheme, when the signal is detected to be required to be overturned, the parameters of frequency conversion phase shift processing are obtained, and intelligent control is achieved.
Optionally, the system for removing interference from a signal, wherein the parameter obtaining module includes:
the counting unit is used for setting a counter to count, and the counter counts at least once in a sampling period;
the reading unit is used for reading the counter when the output signal is detected to need to be turned over;
and the parameter acquisition unit is used for acquiring the parameters of the frequency conversion processing and the phase shift processing corresponding to the counter.
According to the technical scheme, when the counter is set, the output signal is detected to be required to be turned over in a sampling period, namely when the signal is output, the counter is read, the frequency conversion processing and the phase shift processing parameters corresponding to the counting of the counter are obtained, the frequency conversion processing and the phase shift processing are carried out, the influence of human factors is reduced through a random mode, and the precision is guaranteed.
Optionally, in the system for removing interference from a signal, the parameter of the frequency conversion processing is an output frequency, and the parameter of the phase shift processing is a phase shift time.
In summary, the present application discloses a method and a system for removing interference from a signal, wherein the method includes: acquiring an initial output signal; carrying out frequency conversion processing on the initial output signal; performing phase shift processing on the initial output signal; acquiring an output signal after frequency conversion and phase shift processing; when the deviation of the output signal after the frequency conversion phase shift processing and the initial output signal is not in the preset range, repeating the frequency conversion step, the phase shift step and the judgment step until the deviation of the output signal after the frequency conversion phase shift processing and the previous output signal is in the preset range; before the next frequency conversion step and phase shift step start, recording an output signal after the previous frequency conversion and phase shift as an initial output signal; when the deviation between the output signal after the frequency conversion phase shift processing and the initial output signal is within a preset range, outputting the signal after the frequency conversion phase shift processing; through the scheme, the interference signals can be removed through frequency conversion phase shift processing, and the accuracy of the output signals is ensured.
Drawings
Fig. 1 is a flowchart illustrating steps of a method for removing interference according to the present application.
Detailed Description
The present application is described in further detail below with reference to fig. 1.
In order to solve the problem that interference is removed from signals of a photoelectric sensor in a detection process and the accuracy of signal output is ensured, the application discloses a method for removing the interference from the signals, and referring to fig. 1, the method specifically includes the following steps:
a sampling step, namely acquiring an initial output signal;
a frequency conversion processing step, wherein the frequency conversion processing is carried out on the initial output signal;
a phase-shifting step, in which the initial output signal is phase-shifted;
a secondary sampling step, namely acquiring output signals after frequency conversion and phase shift processing;
a correcting step, namely when the deviation of the output signal after the frequency conversion phase shift processing and the initial output signal is not in a preset range, repeating the frequency conversion step, the phase shift step and the judging step until the deviation of the output signal after the frequency conversion phase shift processing and the previous output signal is in the preset range; before the next frequency conversion step and phase shift step start, recording an output signal after the previous frequency conversion and phase shift as an initial output signal;
and an output step, when the deviation between the output signal after the frequency conversion phase shift processing and the initial output signal is within a preset range, outputting the signal after the frequency conversion phase shift processing.
In the above steps, the order of the frequency conversion processing step and the phase shift processing step can be changed, the method of the present application can remove the interference of the signal, and the implementation logic of the present application is: the optical signal emitted by the photoelectric sensor enters a receiving circuit of the sensor after being reflected on the detected object, and then whether the detected object exists or not is judged according to the amplitude of the signal. When the set value is determined by the externally adjusted electrical parameter or the displacement of the receiving lens, the received signal is compared with the set value, so that the position of the detected object can be determined. When an interference signal is received, the position of the detected object cannot be accurately judged due to the change of the amplitude and the phase of the received signal caused by the superposition of the interference signal. Comparing the sampled signal amplitude with a set value, and giving one level output state when the sampled signal amplitude is greater than or equal to the set value, and giving the other level output state when the sampled signal amplitude is less than the set value. These two levels represent whether the object to be detected is within the detection range or outside the detection range. The change of two states is called output signal inversion. The position where the output signal is inverted is the position of the detected object.
When a test signal is not interfered, the amplitude of the test signal is consistent before and after phase shifting or frequency conversion or is controlled within a certain range in a variable way no matter the phase shifting or the frequency conversion is carried out on the test signal. When a test signal is interfered, the signal of the interference source is superposed on the test signal, so that the amplitude and the phase of the test signal are greatly changed. Therefore, when the interference occurs, after the phase shift or frequency conversion processing is carried out on the test signal, the data is sampled before and after the phase shift or the frequency conversion, and the probability of keeping consistency is very low. Based on the logic, the method carries out sampling after phase shifting and frequency conversion once, and when the error of the sampling result of two times is within a certain range, the interference does not occur, otherwise, the interference is considered to occur. After one or more phase shifts and frequency conversion, the signal will deviate from the interference signal, and the detection is not affected by the interference signal.
The sampling is based on the starting time of the system transmitting pulse as the time reference point, and the received signal is sampled at fixed time and fixed point. Therefore, the time and frequency of the transmitted signal are changed through phase shift and frequency conversion, so that the signal transmitted by the system deviates from the signals transmitted by other signal sources in time, the interference of the same frequency or different frequency can be eliminated, and the aim of accurate detection is fulfilled. After sampling, a time node is needed to perform frequency conversion and phase shift on a signal, so that the method for removing interference from a signal described in the present application includes the following steps before the frequency conversion step:
and when the output signal is detected to be required to be overturned, acquiring parameters of frequency conversion processing and phase shift processing.
In the embodiment of the present application, the first sampling is an initial output signal, and the initial output signal is turned over after hitting a detection object and is converted into a level signal, so that the detection is performed at this time, and therefore, the detection precision needs to be ensured, and therefore, it is necessary to obtain parameters of frequency conversion processing and phase shift processing to perform frequency conversion processing and phase shift processing on the output signal, and then perform subsequent steps such as error determination.
In the foregoing solution, when the output signal needs to be flipped, the parameters of the relevant steps are obtained, specifically, in this embodiment, the method for removing interference includes:
setting a counter to count, wherein the counter counts at least once in a sampling period;
reading the counter when detecting that the output signal needs to be turned over;
and acquiring parameters of frequency conversion processing and phase shift processing corresponding to the counter.
In the above scheme, the parameter of the frequency conversion process is the output frequency, and the parameter of the phase shift process is the phase shift time.
In the embodiment of the present application, a counter is set, and when it is detected that the output signal needs to be inverted, the counter reading is turned on to obtain the random number, and in the preferred embodiment, the selection of 8 phases and 4 frequencies is determined according to the count of the counter. A counter is provided and may be placed anywhere in the overall process, but is guaranteed to count at least once per sampling period. When the output signal is detected to be required to be turned over, the counter can be read, the frequency conversion processing and phase shift processing parameters corresponding to the counting of the counter are obtained, the frequency conversion processing and the phase shift processing are carried out, the influence of human factors is reduced in a random mode, and the precision is guaranteed.
In the preferred embodiment of the present application, the selection of the 8 phases and the 4 frequencies is selected by the binary code of the counter, and the lower three bits of the binary code of the read count value are 000 to 111 corresponding to the 8 phases of the phase shift, and the lower two bits of the binary code are 00 to 11 corresponding to the 4 frequencies of the frequency conversion.
In the embodiment of the present application, the binary code and the phase shift time correspond to:
binary code is 000, corresponding to phase shift 1T; the binary code is 001 corresponding to phase shift 2T;
the binary code is 010, corresponding to phase shift 3T; the binary code is 011, corresponding to phase shift 4T;
the binary code is 100, corresponding to a phase shift of 5T; the binary code is 101, corresponding to a phase shift of 6T;
the binary code is 110, corresponding to a phase shift of 7T; the binary code is 111, corresponding to a phase shift of 8T.
The binary code corresponds to frequency as:
binary code 00, corresponding to frequency F1; binary code 01, corresponding to frequency F2
Binary code 10, corresponding to frequency F3; the binary code is 11, corresponding to frequency F4.
The foregoing solution mentions that when the output signal is detected to be inverted, the frequency of the frequency conversion and the phase shift time are obtained, and therefore, based on the frequency of the frequency conversion, the frequency conversion step includes:
and based on the frequency needing frequency conversion processing, giving a timing value corresponding to the frequency to a timer for controlling transmission, restarting the timer, and executing a transmission task according to the new timing value.
Based on the phase shift time, the phase shift step comprises:
and controlling the transmitting time to delay according to the phase shifting time based on the phase shifting time, restarting the timer, and performing phase shifting processing on the output signal.
In the embodiment of the application, the output of the signal is controlled by the timer to execute the transmitting task, the timing of the timer is generally set, when frequency conversion processing is needed, because the binary code of the counter corresponds to the frequency, the frequency is reversely deduced to the counting of the counter, the counting value is given to the timer, the timer is restarted, the system executes the transmitting task according to the new timing value, thereby realizing the frequency conversion processing of the output signal, when the phase conversion processing is needed, the original transmitting time is delayed according to the phase shift time, the timer is restarted, the phase shift step is realized, because when interference occurs, after the phase shift or frequency conversion processing is carried out on the test signal, the probability of consistency can be kept very low, after one or more times of frequency conversion and phase shift processing, the deviation of the two times of signals is within the preset range, then, the interference is eliminated, and the signal processed by the frequency conversion and phase shift at the last time is output.
To the above method, in the embodiment of the present application, a system for removing interference from a signal is further disclosed, where the system includes:
the sampling module is used for acquiring an initial output signal;
the frequency conversion processing module is used for carrying out frequency conversion processing on the initial output signal;
the phase-shifting processing module is used for performing phase-shifting processing on the initial output signal;
the secondary sampling module is used for acquiring output signals after frequency conversion and phase shift processing;
the correcting module is used for repeating the frequency conversion step, the phase shifting step and the judging step when the deviation of the output signal after the frequency conversion phase shifting processing and the initial output signal is not in the preset range until the deviation of the output signal after the frequency conversion phase shifting processing and the previous output signal is in the preset range; before the next frequency conversion step and phase shift step start, recording an output signal after the previous frequency conversion and phase shift as an initial output signal;
and the signal output module is used for outputting the signals after the frequency conversion phase shift processing when the deviation between the output signals after the frequency conversion phase shift processing and the initial output signals is within a preset range.
The utility model provides a system, through sampling for the first time, acquire initial output signal, carry out the frequency conversion and shift the phase to initial output signal and handle, output signal after handling samples again, compare twice signal, if twice signal deviation is in predetermineeing the within range, then show, output signal does not receive the interference, carry out signal output, and exceed when twice signal deviation and predetermine the scope, then set the output signal after shifting the frequency conversion phase as initial signal, and continue to carry out the frequency conversion and shift the phase and handle, when signal output until adjacent twice does not have great deviation, show that interference signal removes, export ultimate output signal this moment, through above-mentioned scheme, can get rid of the interference, guarantee output signal's accuracy. The implementation process of each module of the specific system has already been described in detail in the method scheme, and therefore is not described herein again.
The system further comprises:
and the parameter acquisition module is used for acquiring parameters of frequency conversion processing and phase shift processing when the output signal is detected to be required to be overturned.
According to the embodiment of the application, when the signal is detected to be required to be overturned, the parameters of frequency conversion phase shift processing are obtained, and intelligent control is achieved.
The system for removing interference from a signal, wherein the parameter obtaining module includes:
the counting unit is used for setting a counter to count, and the counter counts at least once in a sampling period;
the reading unit is used for reading the counter when the output signal is detected to need to be turned over;
and the parameter acquisition unit is used for acquiring the parameters of the frequency conversion processing and the phase shift processing corresponding to the counter.
According to the specific embodiment of the application, when the counter is set, the output signal is detected to be required to be turned over in a sampling period, namely when the signal is output, the counter is read, the frequency conversion processing and the phase shift processing parameters corresponding to the counting of the counter are obtained, the frequency conversion processing and the phase shift processing are carried out, the influence of human factors is reduced through a random mode, and the precision is guaranteed.
The system for removing the interference of the signal is characterized in that the parameter of the frequency conversion processing is output frequency, and the parameter of the phase shift processing is phase shift time.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A method for signal interference cancellation, comprising:
a sampling step, namely acquiring an initial output signal;
a frequency conversion processing step, wherein the frequency conversion processing is carried out on the initial output signal;
a phase-shifting step, in which the initial output signal is phase-shifted;
a secondary sampling step, namely acquiring output signals after frequency conversion and phase shift processing;
a correcting step, when the deviation of the output signal after the frequency conversion phase shift processing and the initial output signal is not in a preset range, repeating the frequency conversion processing step and the phase shift processing step until the deviation of the output signal after the frequency conversion phase shift processing and the previous output signal is in the preset range; before the next frequency conversion processing step and the phase shift processing step start, recording an output signal after the previous frequency conversion and phase shift as an initial output signal;
and an output step, when the deviation between the output signal after the frequency conversion phase shift processing and the initial output signal is within a preset range, outputting the signal after the frequency conversion phase shift processing.
2. The method of claim 1, wherein the step of frequency conversion processing is preceded by the steps of:
and when the output signal is detected to be required to be overturned, acquiring parameters of frequency conversion processing and phase shift processing.
3. The method of claim 2, wherein the step of detecting that the output signal needs to be inverted comprises the steps of:
setting a counter to count, wherein the counter counts at least once in a sampling period;
reading the counter when detecting that the output signal needs to be turned over;
and acquiring parameters of frequency conversion processing and phase shift processing corresponding to the counter.
4. The method according to claim 3, wherein the parameter of the frequency conversion process is an output frequency, and the parameter of the phase shift process is a phase shift time.
5. The method of claim 4, wherein the frequency conversion processing step comprises:
and based on the frequency needing frequency conversion processing, giving a timing value corresponding to the frequency to a timer for controlling transmission, restarting the timer, and executing a transmission task according to the new timing value.
6. The method of claim 4, wherein the phase-shifting step comprises:
and based on the phase-shifting time, controlling the transmitting time to delay according to the phase-shifting time, restarting the timer, and performing phase-shifting processing on the output signal.
7. A system for signal de-interference, comprising:
the sampling module is used for acquiring an initial output signal;
the frequency conversion processing module is used for carrying out frequency conversion processing on the initial output signal;
the phase-shifting processing module is used for performing phase-shifting processing on the initial output signal;
the secondary sampling module is used for acquiring output signals after frequency conversion and phase shift processing;
the correction module is used for repeating frequency conversion processing and phase shift processing through the frequency conversion processing module and the phase shift processing module when the deviation of the output signal subjected to frequency conversion phase shift processing and the initial output signal is not in a preset range until the deviation of the output signal subjected to frequency conversion phase shift processing and the previous output signal is in the preset range; before the next frequency conversion processing and phase shift processing are started, the output signal after the previous frequency conversion and phase shift is recorded as an initial output signal;
and the signal output module is used for outputting the signals after the frequency conversion phase shift processing when the deviation between the output signals after the frequency conversion phase shift processing and the initial output signals is within a preset range.
8. The system for removing interference according to claim 7, further comprising:
and the parameter acquisition module is used for acquiring parameters of frequency conversion processing and phase shift processing when the output signal is detected to be required to be overturned.
9. The system for removing interference according to claim 8, wherein the parameter obtaining module comprises:
the counting unit is used for setting a counter to count, and the counter counts at least once in a sampling period;
the reading unit is used for reading the counter when the output signal is detected to need to be turned over;
and the parameter acquisition unit is used for acquiring the parameters of the frequency conversion processing and the phase shift processing corresponding to the counter.
10. The system according to claim 9, wherein the parameter of the frequency conversion process is an output frequency, and the parameter of the phase shift process is a phase shift time.
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| EP2226651A1 (en) * | 2009-03-04 | 2010-09-08 | Sick Ag | Optoelectronic sensor |
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