CN113687193B - Radio interference time domain rule statistics method, device, equipment and storage medium - Google Patents
Radio interference time domain rule statistics method, device, equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a radio interference time domain rule statistical method, which comprises the steps of constructing a voltage pulse sequence of radio interference measurement voltage; performing spatial attenuation processing on the voltage pulse sequence; and calculating to obtain a time domain waveform sequence of the radio interference electric field according to the voltage pulse sequence subjected to the spatial attenuation treatment. The invention also discloses a radio interference time domain rule statistics device, equipment and a storage medium, which can reconstruct a radio interference test voltage random pulse sequence, and perform statistical analysis on the electric field time domain characteristics of the pulse sequence to obtain the time domain characteristic rule of the radio interference, thereby laying a foundation for analysis of the direct current corona discharge radio interference of the power transmission line.
Description
Technical Field
The present invention relates to the field of radio, and in particular, to a method, apparatus, device, and storage medium for counting time domain rules of radio interference.
Background
As an important transmission mode in the current stage of China, the high-voltage direct-current transmission has the advantages of stability, small loss, narrow corridor width, low line cost and the like. Up to now, 24 extra-high voltage projects of 'thirteen-cross-ten-one' are built in China, wherein the extra-high voltage projects comprise a +/-1100 kV extra-high voltage direct-current transmission line with highest voltage level, most advanced technical level, maximum transmission capacity and furthest transmission distance in the current world transmission line, the current conversion capacity is 2400 ten thousand kilowatts, and the total length of the line is 3324 km.
Because the voltage level is higher, overhead transmission line is liable to be influenced by wire roughness and filth generated by weather reasons, under normal operation conditions, corona discharge phenomenon is liable to be generated on the surface of the wire, and radio interference generated by corona discharge can generate electromagnetic interference on peripheral radio towers and influence oil gas pipelines near the transmission line. If the radio interference is improperly controlled, the normal state of the surrounding electromagnetic environment can be obviously affected, and the problem of the radio interference generated by corona discharge has become one of important factors restricting the construction of the extra-high voltage direct current transmission line.
At present, researches on the problem of radio interference of a direct current transmission line are still concentrated on engineering application level and frequency domain characteristics, measurement of radio interference is concentrated on frequency domain 0.5MHz or 1.0MHz to perform single-frequency point measurement, and few researches on time domain waveforms and influence factors of radio interference are performed. Therefore, in order to comprehensively grasp the time-frequency statistical characteristics of the corona discharge radio interference of the direct current wire, so as to more accurately and rapidly analyze the radio interference on the direct current wire, it is necessary to count the time-domain characteristics of the radio interference.
Disclosure of Invention
The embodiment of the invention aims to provide a method, a device, equipment and a storage medium for counting time domain rules of radio interference. The time domain characteristic rule of the radio interference is obtained by reconstructing a random pulse sequence of the radio interference test voltage and carrying out statistical analysis on the time domain characteristic of an electric field of the pulse sequence, and a foundation is laid for analysis of the radio interference of the direct-current corona discharge of the power transmission line.
To achieve the above object, an embodiment of the present invention provides a method for counting time domain rules of radio interference, including:
constructing a voltage pulse sequence of radio interference measurement voltage;
performing spatial attenuation processing on the voltage pulse sequence;
and calculating to obtain a time domain waveform sequence of the radio interference electric field according to the voltage pulse sequence subjected to the spatial attenuation treatment.
As an improvement of the above solution, the construction of the voltage pulse sequence of the radio interference measurement voltage specifically includes:
constructing a voltage pulse amplitude sequence of radio interference measurement voltage;
constructing a pulse time interval sequence of radio interference measurement voltages;
and constructing a radio interference measurement voltage pulse sequence according to the voltage pulse amplitude sequence and the pulse time interval sequence.
As an improvement of the above solution, the construction of the voltage pulse amplitude sequence of the radio interference measurement voltage specifically includes:
the amplitude function construction step: constructing a voltage pulse amplitude generating function, and satisfying the following formula:
wherein mu p Representing a preset voltage pulse amplitude average value sigma p Represents the standard deviation of the preset voltage pulse amplitude, u pm Representing the mth voltage pulse amplitude, m is a positive integer less than or equal to N, and C represents a random constant between 0 and 1;
A first initialization step: randomly taking a value of [0,1] as a value of a parameter C;
a pulse amplitude calculating step: solving the voltage pulse amplitude generating function to obtain a voltage pulse amplitude;
the first repeating calculating step: repeating the first initializing step and the pulse amplitude calculating step until N voltage pulse amplitudes are obtained;
amplitude sequence construction: and constructing a voltage pulse amplitude sequence of the radio interference measurement voltage according to the N voltage pulse amplitudes.
As an improvement of the above scheme, the constructing the pulse time interval sequence specifically includes:
and a time function construction step: constructing a pulse time interval generating function, which satisfies the following formula:
wherein mu i Representing a preset pulse time interval average value sigma i Representing the standard deviation of preset pulse time interval, t im Represents the mth pulse time interval, m is a positive integer less than or equal to N, C ti Represents a random constant between 0 and 1;
a second initialization step: at [0,1]Randomly take value as parameter C ti Is a value of (2);
and calculating the time interval: solving the pulse time interval generating function to obtain a pulse time interval;
and a second repeated calculation step: repeating the second initializing step and the time interval calculating step until N pulse time intervals are obtained;
The time interval sequence construction step: a sequence of pulse time intervals of the radio interference measurement voltage is constructed from the N pulse time intervals.
As an improvement of the above solution, before said constructing a radio interference measurement voltage pulse sequence from said voltage pulse amplitude sequence and said pulse time interval sequence, further comprises:
and deleting the pulse time intervals of which the pulse time intervals are smaller than the preset pulse width in the pulse time interval sequence.
As an improvement of the above solution, the calculating to obtain the radio interference electric field time domain waveform sequence according to the voltage pulse sequence after the spatial attenuation processing specifically includes:
performing single-pulse radio interference electric field time domain waveform calculation operation on each voltage pulse in the voltage pulse sequence subjected to the spatial attenuation treatment to obtain a radio interference electric field time domain waveform corresponding to the voltage pulse;
and obtaining a radio interference electric field time domain waveform sequence according to all the radio interference electric field time domain waveforms and the pulse time interval sequence.
As an improvement of the above solution, the single-pulse radio interference electric field time domain waveform calculating operation specifically includes:
Extracting a time domain waveform of the voltage pulse;
performing Fourier transformation on the time domain waveform of the voltage pulse to obtain a frequency domain result of the voltage pulse;
obtaining a frequency domain result of a radio interference electric field corresponding to the voltage pulse according to the frequency domain result of the voltage pulse;
and obtaining a time domain waveform of the radio interference electric field corresponding to the voltage pulse according to the frequency domain result of the radio interference electric field corresponding to the voltage pulse.
To achieve the above object, an embodiment of the present invention further provides a device for counting time domain rules of radio interference, including:
the voltage pulse sequence construction module is used for constructing a voltage pulse sequence of the radio interference measurement voltage;
the spatial attenuation processing module is used for performing spatial attenuation processing on the voltage pulse sequence;
and the electric field time domain rule statistics module is used for calculating and obtaining a radio interference electric field time domain waveform sequence according to the voltage pulse sequence subjected to the spatial attenuation treatment.
To achieve the above object, an embodiment of the present invention further provides a radio interference time domain rule statistics device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor executes the computer program to implement the radio interference time domain rule statistics method according to any one of the embodiments above.
To achieve the above object, an embodiment of the present invention further provides a storage medium, where the storage medium includes a stored computer program, where the computer program controls a device where the storage medium is located to execute the radio interference time domain rule statistics method according to any one of the above embodiments when running.
Compared with the prior art, the method, the device, the equipment and the storage medium for counting the time domain rule of the radio interference disclosed by the embodiment of the invention are used for calculating the time domain waveform sequence of the radio interference electric field according to the voltage pulse sequence subjected to the spatial attenuation treatment by constructing the voltage pulse sequence of the radio interference measurement voltage and performing the spatial attenuation treatment on the voltage pulse sequence. According to the embodiment of the invention, the time domain waveform sequence of the radio interference electric field is obtained according to the constructed radio interference test voltage random pulse sequence, the time domain characteristic rule of the radio interference is obtained, the full-frequency band characteristic of the wire corona discharge radio interference is mastered, and references are provided for the predictive analysis of the direct-current line radio interference and the wire structure selection.
Drawings
Fig. 1 is a flowchart of a method for counting time domain rules of radio interference according to an embodiment of the present invention;
Fig. 2 is a flowchart of another method for counting time domain rule of radio interference according to an embodiment of the present invention;
FIG. 3 is a voltage waveform comparison chart according to an embodiment of the present invention;
FIG. 4 is a graph showing quasi-peak comparison provided by an embodiment of the present invention;
fig. 5 is a block diagram of a radio interference time domain rule statistics device according to an embodiment of the present invention;
FIG. 6 is a block diagram of a voltage pulse train construction module according to an embodiment of the present invention;
FIG. 7 is a block diagram of an amplitude sequence construction unit according to an embodiment of the present invention;
FIG. 8 is a block diagram of a time interval sequence constructing unit according to an embodiment of the present invention;
fig. 9 is a block diagram of another apparatus for counting time domain regularity of radio interference according to an embodiment of the present invention;
fig. 10 is a block diagram of an electric field time domain rule statistics module according to an embodiment of the present invention;
FIG. 11 is a block diagram illustrating a structure of an electric field time domain waveform calculating unit according to an embodiment of the present invention;
fig. 12 is a block diagram of a radio interference time domain rule statistics apparatus according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a flowchart of a method for counting time domain rules of radio interference according to an embodiment of the present invention is shown.
The radio interference time domain rule statistical method can be executed by a client, and the client can be user terminal equipment such as a computer, a mobile phone, a tablet and the like; the client may be loaded with various applications including pulse sequence generation class and waveform generation class, and is used for presenting time domain waveforms and frequency domain waveforms of various signals. By way of example, the client may include a display screen for presenting a data interface for time domain waveforms and frequency domain waveforms of various signals, and for interacting with a user, and a processor; the processor is used for generating time domain waveforms and frequency domain waveforms of various signals and controlling the display of the data interface on the display screen.
The method comprises the steps of S11 to S13:
s11, constructing a voltage pulse sequence of radio interference measurement voltage;
s12, performing spatial attenuation processing on the voltage pulse sequence;
s13, calculating to obtain a time domain waveform sequence of the radio interference electric field according to the voltage pulse sequence subjected to the spatial attenuation treatment.
In step S11, according to the distribution characteristics of the radio interference voltage, a voltage pulse sequence of the radio interference measurement voltage is constructed at the client, and the voltage pulse sequence of the radio interference measurement voltage can be quickly, accurately and comprehensively obtained without collecting the voltage pulse of the radio interference that actually occurs.
In step S12, the principle of spatial attenuation is as follows: assuming M discharge points on the wire, the voltage waveform of the radio interference of each discharge point can be generated according to a voltage pulse sequence, and the attenuation function of the voltage waveform is close to the exponential distribution u in consideration of the obvious nonlinear characteristic of the radio interference measurement voltage along with the change of the horizontal distance Mp ＝u pi e -κl Wherein the coefficient κ is defined as the attenuation coefficient of the radio interference peak and is taken to be 1.94, u Mp For measuring the radio interference pulse amplitude at the point u pi Is the radio interference voltage amplitude at the ith discharge point.
In step S13, the client obtains the time domain characteristics of the radio interference by processing the constructed voltage pulse sequence.
Compared with the prior art, the radio interference time domain rule statistical method disclosed by the embodiment of the invention is used for calculating and obtaining the radio interference electric field time domain waveform sequence according to the voltage pulse sequence subjected to the spatial attenuation treatment by constructing the voltage pulse sequence of the radio interference measurement voltage and performing the spatial attenuation treatment on the voltage pulse sequence. According to the embodiment of the invention, the time domain waveform sequence of the radio interference electric field is obtained according to the constructed radio interference test voltage random pulse sequence, the time domain characteristic rule of the radio interference is obtained, the full-frequency band characteristic of the wire corona discharge radio interference is mastered, and references are provided for the predictive analysis of the direct-current line radio interference and the wire structure selection.
In one embodiment, the step S11 of constructing the voltage pulse sequence of the radio interference measurement voltage specifically includes steps S111 to S113:
s111, constructing a voltage pulse amplitude sequence of radio interference measurement voltage;
s112, constructing a pulse time interval sequence of radio interference measurement voltage;
s113, constructing a radio interference measurement voltage pulse sequence according to the voltage pulse amplitude sequence and the pulse time interval sequence.
Specifically, according to the distribution characteristics of the pulse amplitude values of the radio interference measurement voltage, calculating to obtain a plurality of pulse amplitude values to form a voltage pulse amplitude sequence; according to the distribution characteristics of the pulse time intervals of the radio interference measurement voltage, calculating to obtain a plurality of pulse time intervals to form a time interval sequence; and constructing a radio interference measurement voltage pulse sequence according to the voltage pulse amplitude sequence and the pulse time interval sequence.
In one embodiment, the voltage pulse amplitude sequence for constructing the radio interference measurement voltage in step S111 includes steps S1111 to S1115:
s1111, amplitude function construction: constructing a voltage pulse amplitude generating function, and satisfying the following formula:
Wherein mu p Representing a preset voltage pulse amplitude average value sigma p Represents the standard deviation of the preset voltage pulse amplitude, u pm Representing the mth voltage pulse amplitude, m is a positive integer less than or equal to N, and C represents a random constant between 0 and 1;
s1112, a first initialization step: randomly taking a value of [0,1] as a value of a parameter C;
s1113, pulse amplitude calculation: solving the voltage pulse amplitude generating function to obtain a voltage pulse amplitude;
s1114, the first repeated calculation step: repeating the first initializing step and the pulse amplitude calculating step until N voltage pulse amplitudes are obtained;
s1115, amplitude sequence construction: and constructing a voltage pulse amplitude sequence of the radio interference measurement voltage according to the N voltage pulse amplitudes.
Specifically, the principle of generation of the voltage pulse amplitude of the radio interference measurement voltage is as follows:
the voltage pulse amplitude probability density distribution of the radio interference measurement voltage approximately satisfies the lognormal distribution, and the expression thereof is expressed as:
wherein u is p Represents the measured voltage pulse amplitude, mu p Sum sigma p The mean value and standard deviation of the amplitude logarithm are respectively represented, and the probability distribution function corresponding to the voltage pulse amplitude is represented as:
F (u) pm ) If the value of (2) is between 0 and 1, if a random number C is generated between 0 and 1, this is made equal to F (u) pm ) The following steps are:
by generating the random number C for multiple times, repeatedly solving the above method to obtain multiple pulse amplitudes u satisfying lognormal distribution pm (m=1, 2, … …, N) to form a voltage pulse amplitude sequence, N being the number of pulses to be structured.
Mu, in the form of a powder p Sum sigma p The specific value of the preset value is related to the diameter of the wire, and can be set according to actual conditions.
In one embodiment, the constructing the pulse time interval sequence in step S112 specifically includes steps S1121 to S1125:
s1121, a time function construction step: constructing a pulse time interval generating function, which satisfies the following formula:
wherein mu i Representing a preset pulse time interval average value sigma i Representing the standard deviation of preset pulse time interval, t im Represents the mth pulse time interval, m is a positive integer less than or equal to N, C ti Represents a random constant between 0 and 1;
s1122, a second initialization step: at [0,1]Randomly take value as parameter C ti Is a value of (2);
s1123, calculating a time interval: solving the pulse time interval generating function to obtain a pulse time interval;
S1124, a second repeated calculation step: repeating the second initializing step and the time interval calculating step until N pulse time intervals are obtained;
s1125, constructing a time interval sequence: a sequence of pulse time intervals of the radio interference measurement voltage is constructed from the N pulse time intervals.
In particular, the principle of generation of the time interval sequence of radio interference measurement voltages is as follows:
the distribution of the pulse time intervals of the radio interference measurement voltage approximately satisfies a normal distribution, the expression of which is expressed as:
wherein t is i Represents pulse time interval, mu i Sum sigma i Mean and standard deviation of the time intervals are shown, respectively. And the probability distribution function corresponding to the pulse time interval is expressed as:
by generating random numbers C between 0 and 1 ti Let F (t) im )＝C ti The method comprises the following steps:
by generating random numbers C a plurality of times ti Repeatedly solving the above steps to obtain a plurality of pulse time intervals t im (m=1, 2, … …, N) to form a sequence of pulse time intervals.
Mu, in the form of a powder i Sum sigma i The specific value of (2) is preset and can be set according to actual conditions.
In one embodiment, before step S113, step S1130 is further included: and deleting the pulse time intervals of which the pulse time intervals are smaller than the preset pulse width in the pulse time interval sequence.
In particular, if the value of the pulse time interval is smaller than the pulse width t of the radio interference d (approximately 350 ns), the value of the pulse time interval is truncated, ensuring that the subsequently constructed radio-interfered pulse sequence does not exhibit pulse overlap.
Further, the pulse waveform of the radio interference presents double-exponential pulse, and according to the generated voltage pulse amplitude sequence and pulse time interval sequence of the radio interference, a random sequence of radio interference measurement voltages can be constructed:
wherein u is T (T) represents a pulse sequence for a period of time, T being the duration of the pulse sequence, k=2.73, α=1.214×107; β= 3.508 ×107. T generated in steps S1111 to S1115 and steps S1121 to S1125 is calculated im U pm Substituting the random sequence into the above formula to obtain the random sequence of the radio interference measurement voltage pulse.
In one embodiment, in step S13, the radio interference electric field time domain waveform sequence is calculated according to the voltage pulse sequence after the spatial attenuation processing, and specifically includes steps S131 to S132:
s131, performing single-pulse radio interference electric field time domain waveform calculation operation on each voltage pulse in the voltage pulse sequence subjected to the spatial attenuation treatment to obtain a radio interference electric field time domain waveform corresponding to the voltage pulse;
S132, obtaining a radio interference electric field time domain waveform sequence according to all the radio interference electric field time domain waveforms and the pulse time interval sequence.
In one embodiment, the operation of calculating the monopulse radio interference electric field time domain waveform in step S131 specifically includes steps S1311 to S1314:
s1311, extracting a time domain waveform of the voltage pulse;
s1312, performing Fourier transform on the time domain waveform of the voltage pulse to obtain a frequency domain result of the voltage pulse;
s1313, obtaining a frequency domain result of a radio interference electric field corresponding to the voltage pulse according to the frequency domain result of the voltage pulse;
and S1314, obtaining a time domain waveform of the radio interference electric field corresponding to the voltage pulse according to the frequency domain result of the radio interference electric field corresponding to the voltage pulse.
Specifically, the voltage pulse sequence is subjected to monopulse analysis to obtain a monopulse time domain waveform u s (t) obtaining a corresponding frequency domain result U by utilizing fast-reading Fourier transform s (jω) based on the pre-acquired relation between the radio interference voltage and the radio interference field strength of the antenna test, a frequency domain result of the field strength of the single radio interference can be obtained, specifically expressed as: Wherein ω is angular frequency, R and C' are sampling resistance and equivalent capacitance of the test antenna, t dE For the duration of the radio interference electric field pulse.
A specific flow of the radio interference time domain rule statistics method can also be seen in fig. 2.
To further illustrate the accuracy of the rule counted according to the radio interference time domain rule counting method, the following is performed by verifying the accuracy according to the experimental results of the experimental test:
as shown in fig. 3, the left side of fig. 3 is a radio interference measurement voltage waveform obtained by experimental test, the right side is a radio interference measurement voltage waveform counted by the method, the experimental test and the result pair of the radio interference quasi-peak values under different diameter wires obtained by quasi-peak value calculation according to the method are shown in fig. 4, it can be known from fig. 3 and fig. 4 that the difference between the measurement result obtained by the actual test and the calculation result of the random model corresponding to the method is in the range of 2dB (μv/m), the accuracy of the rule counted by the radio interference time domain rule counting method is verified, and the radio interference time domain rule counted by the method can be utilized to analyze the direct current corona discharge radio interference of the power transmission line and provide reference for wire structure selection.
Compared with the prior art, the embodiment of the invention obtains the time domain waveform sequence of the radio interference electric field according to the constructed radio interference test voltage random pulse sequence, obtains the time domain characteristic rule of the radio interference, grasps the full-frequency band characteristic of the wire corona discharge radio interference, and provides reference for the predictive analysis of the radio interference of the direct current circuit and the wire structure selection.
Referring to fig. 5, fig. 5 is a block diagram of a radio interference time domain rule statistics apparatus according to an embodiment of the present invention. The radio interference time domain law statistics apparatus 20 includes:
a voltage pulse sequence construction module 21 for constructing a voltage pulse sequence of the radio interference measurement voltage;
a spatial attenuation processing module 22, configured to perform spatial attenuation processing on the voltage pulse sequence;
the electric field time domain rule statistics module 23 is configured to calculate a radio interference electric field time domain waveform sequence according to the voltage pulse sequence after the spatial attenuation processing.
In the voltage pulse sequence construction module 21, a voltage pulse sequence of the radio interference measurement voltage is constructed according to the distribution characteristics of the radio interference voltage, and the voltage pulse sequence of the radio interference measurement voltage can be quickly, accurately and comprehensively obtained without collecting voltage pulses of the radio interference that actually occurs.
In the spatial attenuation processing module 22, the principle of spatial attenuation is as follows: assuming M discharge points on the wire, the voltage waveform of the radio interference of each discharge point can be generated according to a voltage pulse sequence, and the attenuation function of the voltage waveform is close to the exponential distribution u in consideration of the obvious nonlinear characteristic of the radio interference measurement voltage along with the change of the horizontal distance Mp ＝u pi e -κl Wherein the coefficient κ is defined as the attenuation coefficient of the radio interference peak and is taken to be 1.94, u Mp For measuring the radio interference pulse amplitude at the point u pi Is the radio interference voltage amplitude at the ith discharge point.
In the electric field time domain rule statistics module 23, the time domain characteristics of the radio interference are obtained by processing the constructed voltage pulse sequence.
Compared with the prior art, the radio interference time domain rule statistics device disclosed by the embodiment of the invention is used for calculating and obtaining the radio interference electric field time domain waveform sequence according to the voltage pulse sequence subjected to the spatial attenuation treatment by constructing the voltage pulse sequence of the radio interference measurement voltage and performing the spatial attenuation treatment on the voltage pulse sequence. According to the embodiment of the invention, the time domain waveform sequence of the radio interference electric field is obtained according to the constructed radio interference test voltage random pulse sequence, the time domain characteristic rule of the radio interference is obtained, the full-frequency band characteristic of the wire corona discharge radio interference is mastered, and references are provided for the predictive analysis of the direct-current line radio interference and the wire structure selection.
In one embodiment, referring to fig. 6, the voltage pulse sequence construction module 21 specifically includes:
an amplitude sequence construction unit 211 for constructing a voltage pulse amplitude sequence of the radio interference measurement voltage;
a time interval sequence construction unit 212 for constructing a pulse time interval sequence of radio interference measurement voltages;
a pulse sequence construction unit 213 for constructing a radio interference measurement voltage pulse sequence from the voltage pulse amplitude sequence and the pulse time interval sequence
Specifically, according to the distribution characteristics of the pulse amplitude values of the radio interference measurement voltage, calculating to obtain a plurality of pulse amplitude values to form a voltage pulse amplitude sequence; according to the distribution characteristics of the pulse time intervals of the radio interference measurement voltage, calculating to obtain a plurality of pulse time intervals to form a time interval sequence; and constructing a radio interference measurement voltage pulse sequence according to the voltage pulse amplitude sequence and the pulse time interval sequence.
In one embodiment, referring to fig. 7, the amplitude sequence construction unit 211 specifically includes:
an amplitude function construction subunit 2111 for executing an amplitude function construction step: constructing a voltage pulse amplitude generating function, and satisfying the following formula:
Wherein mu p Representing a preset voltage pulse amplitude average value sigma p Represents the standard deviation of the preset voltage pulse amplitude, u pm Representing the mth voltage pulse amplitude, m is a positive integer less than or equal to N, and C represents a random constant between 0 and 1;
a first initialization subunit 2112 for performing a first initialization step: randomly taking a value of [0,1] as a value of a parameter C;
a pulse amplitude calculation subunit 2113 for performing a pulse amplitude calculation step: solving the voltage pulse amplitude generating function to obtain a voltage pulse amplitude;
a first repetition calculation subunit 2114, configured to perform a first repetition calculation step: repeating the first initializing step and the pulse amplitude calculating step until N voltage pulse amplitudes are obtained;
an amplitude sequence construction subunit 2115 for executing an amplitude sequence construction step: and constructing a voltage pulse amplitude sequence of the radio interference measurement voltage according to the N voltage pulse amplitudes.
Specifically, the principle of generation of the voltage pulse amplitude of the radio interference measurement voltage is as follows:
the voltage pulse amplitude probability density distribution of the radio interference measurement voltage approximately satisfies the lognormal distribution, and the expression thereof is expressed as:
Wherein u is p Represents the measured voltage pulse amplitude, mu p Sum sigma p The mean value and standard deviation of the amplitude logarithm are respectively represented, and the probability distribution function corresponding to the voltage pulse amplitude is represented as:
f (u) pm ) If the value of (2) is between 0 and 1, if a random number C is generated between 0 and 1, this is made equal to F (u) pm ) The following steps are:
by generating the random number C for multiple times, repeatedly solving the above method to obtain multiple pulse amplitudes u satisfying lognormal distribution pm (m=1, 2, … …, N) to form a voltage pulse amplitude sequence, N being the number of pulses to be structured.
Mu, in the form of a powder p Sum sigma p The specific value of the preset value is related to the diameter of the wire, and can be set according to actual conditions.
In one embodiment, referring to fig. 8, the time interval sequence constructing unit 212 specifically includes:
a time function construction subunit 2121 for performing the time function construction step of: constructing a pulse time interval generating function, which satisfies the following formula:
wherein mu i Representing a preset pulse time interval average value sigma i Representing the standard deviation of preset pulse time interval, t im Represents the mth pulse time interval, m is a positive integer less than or equal to N, C ti Represents a random constant between 0 and 1;
a second initialization subunit 2122 configured to perform a second initialization step: at [0,1]Randomly take value as parameter C ti Is a value of (2);
a time interval calculation subunit 2123, configured to perform a time interval calculation step: solving the pulse time interval generating function to obtain a pulse time interval;
a second repetition calculation subunit 2124 configured to perform a second repetition calculation step: repeating the second initializing step and the time interval calculating step until N pulse time intervals are obtained;
a time interval sequence construction subunit 2125 for performing the time interval sequence construction step: a sequence of pulse time intervals of the radio interference measurement voltage is constructed from the N pulse time intervals.
In particular, the principle of generation of the time interval sequence of radio interference measurement voltages is as follows:
the distribution of the pulse time intervals of the radio interference measurement voltage approximately satisfies a normal distribution, the expression of which is expressed as:
wherein t is i Represents pulse time interval, mu i Sum sigma i Respectively mean and average of time intervalsStandard deviation. And the probability distribution function corresponding to the pulse time interval is expressed as:
by generating random numbers C between 0 and 1 ti Let F (t) im )＝C ti The method comprises the following steps:
by generating random numbers C a plurality of times ti Repeatedly solving the above steps to obtain a plurality of pulse time intervals t im (m=1, 2, … …, N) to form a sequence of pulse time intervals.
Mu, in the form of a powder i Sum sigma i The specific value of (2) is preset and can be set according to actual conditions.
In one embodiment, referring to fig. 9, the apparatus further includes a time interval deleting module 24 configured to delete pulse time intervals in the sequence of pulse time intervals that are less than a preset pulse width.
In particular, if the value of the pulse time interval is smaller than the pulse width t of the radio interference d (approximately 350 ns), the value of the pulse time interval is truncated, ensuring that the subsequently constructed radio-interfered pulse sequence does not exhibit pulse overlap.
Further, the pulse waveform of the radio interference presents double-exponential pulse, and according to the generated voltage pulse amplitude sequence and pulse time interval sequence of the radio interference, a random sequence of radio interference measurement voltages can be constructed:
wherein u is T (T) represents a pulse sequence for a period of time, T being the duration of the pulse sequence, k=2.73, α=1.214×107; β= 3.508 ×107. T generated in steps S1111 to S1115 and steps S1121 to S1125 is calculated im U pm Substituting the random sequence into the above formula to obtain the random sequence of the radio interference measurement voltage pulse.
In one embodiment, referring to fig. 10, the electric field time domain rule statistics module 23 specifically includes:
an electric field time domain waveform calculating unit 231, configured to perform a single-pulse radio interference electric field time domain waveform calculating operation on each voltage pulse in the voltage pulse sequence after the spatial attenuation processing, so as to obtain a radio interference electric field time domain waveform corresponding to the voltage pulse;
the electric field time domain waveform sequence calculating unit 232 obtains a radio interference electric field time domain waveform sequence according to all the radio interference electric field time domain waveforms and the pulse time interval sequence.
In one embodiment, referring to fig. 11, the electric field time domain waveform calculating unit 231 specifically includes:
a pulse time domain waveform extraction subunit 2311 extracts a time domain waveform of the voltage pulse;
pulse frequency domain result calculation subunit 2312 performs fourier transform on the time domain waveform of the voltage pulse to obtain a frequency domain result of the voltage pulse;
an electric field frequency domain result calculation subunit 2313, which obtains a frequency domain result of a radio interference electric field corresponding to the voltage pulse according to the frequency domain result of the voltage pulse;
An electric field time domain waveform calculating subunit 2314 obtains a radio interference electric field time domain waveform corresponding to the voltage pulse based on a frequency domain result of the radio interference electric field corresponding to the voltage pulse.
Specifically, the voltage pulse sequence is subjected to monopulse analysis to obtain a monopulse time domain waveform u s (t) obtaining the corresponding frequency domain by using fast-reading Fourier transformResults U s (jω) based on the pre-acquired relation between the radio interference voltage and the radio interference field strength of the antenna test, a frequency domain result of the field strength of the single radio interference can be obtained, specifically expressed as:wherein ω is angular frequency, R and C' are sampling resistance and equivalent capacitance of the test antenna, t dE For the duration of the radio interference electric field pulse.
Compared with the prior art, the embodiment of the invention obtains the time domain waveform sequence of the radio interference electric field according to the constructed radio interference test voltage random pulse sequence, obtains the time domain characteristic rule of the radio interference, grasps the full-frequency band characteristic of the wire corona discharge radio interference, and provides reference for the predictive analysis of the radio interference of the direct current circuit and the wire structure selection.
It should be noted that, the working principle of the radio interference time domain rule statistics device 20 can be referred to the radio interference time domain rule statistics method described in any of the above embodiments, and will not be described herein.
Referring to fig. 12, a radio interference time domain rule statistics apparatus 30 according to an embodiment of the present invention includes a processor 31, a memory 32, and a computer program stored in the memory 32 and configured to be executed by the processor 32, wherein the processor 31 implements steps in an embodiment of the above-mentioned radio interference time domain rule statistics method when executing the computer program, such as steps S11 to S13 described in fig. 1; alternatively, the processor 31 performs the functions of the modules in the above-described device embodiments, such as the voltage pulse sequence construction module 21, when executing the computer program.
Illustratively, the computer program may be split into one or more modules that are stored in the memory 32 and executed by the processor 31 to perform the present invention. The one or more modules may be a series of computer program instruction segments capable of performing a specific function for describing the execution of the computer program in the radio interference time domain law statistics apparatus 30. For example, the computer program may be divided into a voltage pulse sequence construction module 21, a spatial attenuation processing module 22 and an electric field time domain rule statistics module 23, where each module specifically functions as follows:
A voltage pulse sequence construction module 21 for constructing a voltage pulse sequence of the radio interference measurement voltage;
a spatial attenuation processing module 22, configured to perform spatial attenuation processing on the voltage pulse sequence;
the electric field time domain rule statistics module 23 is configured to calculate a radio interference electric field time domain waveform sequence according to the voltage pulse sequence after the spatial attenuation processing.
The specific operation of each module may refer to the operation of the radio interference time domain rule statistics apparatus 20 described in the foregoing embodiment, and will not be described herein.
The radio interference time domain rule statistics device 30 may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The radio interference time domain rule statistics device 30 may include, but is not limited to, a processor 31, a memory 32. It will be appreciated by those skilled in the art that the schematic diagram is merely an example of a radio interference time domain rule statistics apparatus, and does not constitute a limitation of the radio interference time domain rule statistics apparatus 30, and may include more or less components than those illustrated, or may combine some components, or different components, for example, the radio interference time domain rule statistics apparatus 30 may further include an input/output device, a network access device, a bus, and the like.
The processor 31 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor, etc., and the processor 31 is a control center of the radio interference time domain rule statistics apparatus 30, and connects various parts of the entire radio interference time domain rule statistics apparatus 30 using various interfaces and lines.
The memory 32 may be used to store the computer program and/or module, and the processor 31 may implement the various functions of the radio interference time domain rule statistics device 30 by running or executing the computer program and/or module stored in the memory 32 and invoking data stored in the memory 32. The memory 32 may mainly include a memory program area and a memory data area, wherein the memory program area may store an operating system, an application program required for at least one function (such as a voltage pulse sequence generating function), and the like; the storage data area may store data created according to the use of a computer, or the like. In addition, the memory 32 may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
The modules integrated by the radio interference time domain rule statistics device 30 may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as a separate product. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), or the like.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (6)
1. A method for counting time domain rules of radio interference, comprising:
constructing a voltage pulse sequence of radio interference measurement voltage;
performing spatial attenuation processing on the voltage pulse sequence;
according to the voltage pulse sequence subjected to the spatial attenuation treatment, calculating to obtain a time domain waveform sequence of a radio interference electric field;
the construction of the voltage pulse sequence of the radio interference measurement voltage specifically comprises the following steps:
Constructing a voltage pulse amplitude sequence of radio interference measurement voltage;
constructing a pulse time interval sequence of radio interference measurement voltages;
constructing a radio interference measurement voltage pulse sequence according to the voltage pulse amplitude sequence and the pulse time interval sequence;
constructing a pulse time interval sequence specifically comprises the following steps:
and a time function construction step: constructing a pulse time interval generating function, which satisfies the following formula:
；
wherein mu i Representing a preset pulse time interval average value sigma i Representing the standard deviation of preset pulse time interval, t im Represents the mth pulse time interval, m is a positive integer less than or equal to N, C ti Represents a random constant between 0 and 1;
a second initialization step: at [0,1]Randomly take value as parameter C ti Is a value of (2);
and calculating the time interval: solving the pulse time interval generating function to obtain a pulse time interval;
and a second repeated calculation step: repeating the second initializing step and the time interval calculating step until N pulse time intervals are obtained;
the time interval sequence construction step: constructing a pulse time interval sequence of the radio interference measurement voltage according to the N pulse time intervals;
Constructing an expression of a voltage pulse sequence of the radio interference measurement voltage:
wherein u is T (T) represents a pulse sequence for a period of time, T being the duration of the pulse sequence, k=2.73, α=1.214×107; β= 3.508 ×107;representing the amplitude of the ith voltage pulse; />A pulse width representing radio interference;
substituting the voltage pulse amplitude sequence and the pulse time interval sequence into an expression of the voltage pulse sequence of the radio interference measurement voltage to obtain the radio interference measurement voltage pulse sequence;
before said constructing a radio interference measurement voltage pulse sequence from said voltage pulse amplitude sequence and said pulse time interval sequence, further comprising:
deleting the pulse time intervals of which the pulse time intervals are smaller than a preset pulse width in the pulse time interval sequence;
the method comprises the steps of calculating a time domain waveform sequence of a radio interference electric field according to the voltage pulse sequence subjected to the spatial attenuation treatment, and specifically comprises the following steps:
performing single-pulse radio interference electric field time domain waveform calculation operation on each voltage pulse in the voltage pulse sequence subjected to the spatial attenuation treatment to obtain a radio interference electric field time domain waveform corresponding to the voltage pulse;
Obtaining a radio interference electric field time domain waveform sequence according to all the radio interference electric field time domain waveforms and the pulse time interval sequence;
carrying out monopulse analysis on the voltage pulse sequence subjected to the spatial attenuation treatment to obtain a monopulse time domain waveformu s (t) Obtaining corresponding frequency domain results by using fast Fourier transformAccording to the relation between the radio interference voltage and the radio interference field intensity of the antenna test, which is acquired in advance, a frequency domain result of the field intensity of single radio interference is calculated, and the frequency domain result is specifically expressed as:
；
wherein,as a result of the frequency domain of the field strength of the individual radio interferences, ω is the angular frequency and R and C' are the sampling resistance and the equivalent capacitance of the test antenna, respectively.
2. The method of claim 1, wherein the constructing the sequence of voltage pulse amplitudes of the radio interference measurement voltage specifically comprises:
the amplitude function construction step: constructing a voltage pulse amplitude generating function, and satisfying the following formula:
；
wherein mu p Representing a preset voltage pulse amplitude average value sigma p Represents the standard deviation of the preset voltage pulse amplitude, u pm Representing the mth voltage pulse amplitude, m is a positive integer less than or equal to N, and C represents a random constant between 0 and 1;
A first initialization step: randomly taking a value of [0,1] as a value of a parameter C;
a pulse amplitude calculating step: solving the voltage pulse amplitude generating function to obtain a voltage pulse amplitude;
the first repeating calculating step: repeating the first initializing step and the pulse amplitude calculating step until N voltage pulse amplitudes are obtained;
amplitude sequence construction: and constructing a voltage pulse amplitude sequence of the radio interference measurement voltage according to the N voltage pulse amplitudes.
3. The radio interference time domain rule statistics method as claimed in claim 1, wherein the single pulse radio interference electric field time domain waveform calculation operation specifically comprises:
extracting a time domain waveform of the voltage pulse;
performing Fourier transformation on the time domain waveform of the voltage pulse to obtain a frequency domain result of the voltage pulse;
obtaining a frequency domain result of a radio interference electric field corresponding to the voltage pulse according to the frequency domain result of the voltage pulse;
and obtaining a time domain waveform of the radio interference electric field corresponding to the voltage pulse according to the frequency domain result of the radio interference electric field corresponding to the voltage pulse.
4. A radio interference time domain law statistics apparatus, comprising:
The voltage pulse sequence construction module is used for constructing a voltage pulse sequence of the radio interference measurement voltage;
the spatial attenuation processing module is used for performing spatial attenuation processing on the voltage pulse sequence;
the electric field time domain rule statistics module is used for calculating and obtaining a radio interference electric field time domain waveform sequence according to the voltage pulse sequence subjected to the spatial attenuation treatment;
the construction of the voltage pulse sequence of the radio interference measurement voltage specifically comprises the following steps:
constructing a voltage pulse amplitude sequence of radio interference measurement voltage;
constructing a pulse time interval sequence of radio interference measurement voltages;
constructing a radio interference measurement voltage pulse sequence according to the voltage pulse amplitude sequence and the pulse time interval sequence;
constructing a pulse time interval sequence specifically comprises the following steps:
and a time function construction step: constructing a pulse time interval generating function, which satisfies the following formula:
；
wherein mu i Representing a preset pulse time interval average value sigma i Representing the standard deviation of preset pulse time interval, t im Represents the mth pulse time interval, m is a positive integer less than or equal to N, C ti Represents a random constant between 0 and 1;
a second initialization step: at [0,1 ]Randomly take value as parameter C ti Is a value of (2);
and calculating the time interval: solving the pulse time interval generating function to obtain a pulse time interval;
and a second repeated calculation step: repeating the second initializing step and the time interval calculating step until N pulse time intervals are obtained;
the time interval sequence construction step: constructing a pulse time interval sequence of the radio interference measurement voltage according to the N pulse time intervals;
constructing an expression of a voltage pulse sequence of the radio interference measurement voltage:
wherein u is T (T) represents a pulse sequence for a period of time, T being the duration of the pulse sequence, k=2.73, α=1.214×107; β= 3.508 ×107;representing the amplitude of the ith voltage pulse; />A pulse width representing radio interference;
substituting the voltage pulse amplitude sequence and the pulse time interval sequence into an expression of the voltage pulse sequence of the radio interference measurement voltage to obtain the radio interference measurement voltage pulse sequence;
before said constructing a radio interference measurement voltage pulse sequence from said voltage pulse amplitude sequence and said pulse time interval sequence, further comprising:
deleting the pulse time intervals of which the pulse time intervals are smaller than a preset pulse width in the pulse time interval sequence;
The method comprises the steps of calculating a time domain waveform sequence of a radio interference electric field according to the voltage pulse sequence subjected to the spatial attenuation treatment, and specifically comprises the following steps:
performing single-pulse radio interference electric field time domain waveform calculation operation on each voltage pulse in the voltage pulse sequence subjected to the spatial attenuation treatment to obtain a radio interference electric field time domain waveform corresponding to the voltage pulse;
obtaining a radio interference electric field time domain waveform sequence according to all the radio interference electric field time domain waveforms and the pulse time interval sequence;
carrying out monopulse analysis on the voltage pulse sequence subjected to the spatial attenuation treatment to obtain a monopulse time domain waveformu s (t) Obtaining corresponding frequency domain results by using fast Fourier transformAccording to the relation between the radio interference voltage and the radio interference field intensity of the antenna test, which is acquired in advance, a frequency domain result of the field intensity of single radio interference is calculated, and the frequency domain result is specifically expressed as:
；
wherein,as a result of the frequency domain of the field strength of the individual radio interferences, ω is the angular frequency and R and C' are the sampling resistance and the equivalent capacitance of the test antenna, respectively.
5. A radio interference time domain law statistics device comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the radio interference time domain law statistics method according to any of claims 1 to 3 when the computer program is executed by the processor.
6. A storage medium comprising a stored computer program, wherein the computer program, when run, controls a device in which the storage medium is located to perform the radio interference time domain rule statistics method according to any one of claims 1 to 3.
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