CN113687193A - Radio interference time domain rule statistical method, device, equipment and storage medium - Google Patents
Radio interference time domain rule statistical 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 radio interference electric field time domain waveform sequence according to the voltage pulse sequence after the spatial attenuation treatment. The invention also discloses a device, equipment and a storage medium for counting the time domain rule of the radio interference, which can obtain the time domain characteristic rule of the radio interference by reconstructing the random pulse sequence of the radio interference test voltage and carrying out statistical analysis on the electric field time domain characteristic of the pulse sequence, thereby laying a foundation for the 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, an apparatus, a device, and a storage medium for counting a radio interference time domain rule.
Background
The high-voltage direct-current power transmission is an important power transmission mode in the current stage of China, and has the advantages of stability, small loss, narrow corridor width, low line manufacturing cost and the like. By far, 24 extra-high voltage projects of thirteen exchanges and eleven routes have been established in China, wherein the 24 extra-high voltage projects comprise +/-1100 kV extra-high voltage direct current transmission lines of the east China (Xinjiang Changji to Anhui Xuan City) with the highest voltage grade, the most advanced technical level, the largest transmission capacity and the farthest transmission distance in the current transmission lines of the world, the conversion capacity is 2400 ten thousand kilowatts, and the total length of the lines is 3324 kilometers.
Because the voltage level is higher, overhead transmission line is easily influenced by the filth that wire roughness and weather cause produced, under normal operating condition, the wire surface produces corona discharge phenomenon easily, and the radio interference who produces by corona discharge can produce electromagnetic interference to peripheral radio tower, influences the oil gas pipeline near transmission line. If the radio interference is not controlled properly, the normal state of the surrounding electromagnetic environment can be influenced obviously, and the radio interference problem generated by corona discharge becomes one of the important factors for restricting the construction of the extra-high voltage direct current transmission line.
At present, researches on the radio interference problem of the direct current transmission line are still concentrated on the engineering application level and the frequency domain characteristics, the radio interference measurement is mostly concentrated on the frequency domain of 0.5MHz or 1.0MHz for single-frequency point measurement, and the time domain waveform and the influence factors of the radio interference are also rarely researched. Therefore, in order to comprehensively grasp the time-frequency statistical characteristics of the radio interference caused by corona discharge of the dc conductor so as to more accurately and quickly analyze the radio interference on the dc transmission line, it is necessary to perform statistics on the time-domain characteristics of the radio interference.
Disclosure of Invention
The embodiment of the invention aims to provide a radio interference time domain rule statistical method, a device, equipment and a storage medium. The time domain characteristic rule of the radio interference is obtained by reconstructing the random pulse sequence of the radio interference test voltage and carrying out statistical analysis on the electric field time domain characteristic of the pulse sequence, and a foundation is laid for the analysis of the direct current corona discharge radio interference of the power transmission line.
In order to achieve the above object, an embodiment of the present invention provides a method for counting a radio interference time domain rule, including:
constructing a voltage pulse sequence of the radio interference measurement voltage;
performing spatial attenuation processing on the voltage pulse sequence;
and calculating to obtain a radio interference electric field time domain waveform sequence according to the voltage pulse sequence after the spatial attenuation treatment.
As an improvement of the above scheme, the constructing a voltage pulse sequence of the radio interference measurement voltage specifically includes:
constructing a voltage pulse amplitude sequence of the radio interference measurement voltage;
constructing a sequence of pulse time intervals of the radio interference measurement voltage;
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 scheme, the constructing a voltage pulse amplitude sequence of the radio interference measurement voltage specifically includes:
and an amplitude function construction step: constructing a voltage pulse amplitude generation function, and satisfying the following formula:
wherein, mupRepresenting a preset average value, sigma, of the amplitude of the voltage pulsespRepresenting a predetermined standard deviation of the amplitude of the voltage pulse, upmRepresenting the amplitude of the mth voltage pulse, 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 at [0,1] as the value of the parameter C;
and a pulse amplitude calculation step: solving the voltage pulse amplitude generating function to obtain a voltage pulse amplitude;
a first iterative calculation 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 measuring voltage according to the N voltage pulse amplitudes.
As an improvement of the above scheme, the constructing of the pulse time interval sequence specifically includes:
a time function construction step: constructing a pulse time interval generating function, and satisfying the following formula:
wherein, muiRepresenting a preset mean value of the time interval of the pulses, σiIndicating a preset pulse intervalStandard deviation, timRepresenting the m-th pulse interval, m being a positive integer less than or equal to N, CtiRepresents a random constant between 0 and 1;
a second initialization step: in [0,1]]Randomly taking a value as a parameter CtiA value of (d);
a time interval calculation step: solving the pulse time interval generating function to obtain a pulse time interval;
a second repetition calculation step: repeating the second initializing step and the time interval calculating step until N pulse time intervals are obtained;
time interval sequence construction: 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 the constructing a radio interference measurement voltage pulse sequence according to the voltage pulse amplitude sequence and the pulse time interval sequence, the method further includes:
and deleting the pulse time interval in the pulse time interval sequence, wherein the pulse time interval is smaller than the pulse time interval with the preset pulse width.
As an improvement of the above scheme, the calculating, according to the voltage pulse sequence after the spatial attenuation processing, a radio interference electric field time domain waveform sequence includes:
performing single-pulse radio interference electric field time domain waveform calculation operation on each voltage pulse in the voltage pulse sequence after the spatial attenuation processing 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 scheme, the calculation operation of the monopulse radio interference electric field time domain waveform specifically includes:
extracting a time domain waveform of the voltage pulse;
fourier transformation is carried out 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 radio interference electric field time domain waveform corresponding to the voltage pulse according to a frequency domain result of the radio interference electric field corresponding to the voltage pulse.
In order to achieve the above object, an embodiment of the present invention further provides a device for counting time domain regularity 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 carrying out spatial attenuation processing on the voltage pulse sequence;
and the electric field time domain rule statistic module is used for calculating to obtain a radio interference electric field time domain waveform sequence according to the voltage pulse sequence after the spatial attenuation processing.
In order to achieve the above object, an embodiment of the present invention further provides a radio interference time domain law statistical apparatus, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor implements the radio interference time domain law statistical method according to any one of the above embodiments when executing the computer program.
In order 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 apparatus on which the storage medium is located is controlled to execute the radio interference time domain law statistical method according to any one of the above embodiments when the computer program runs.
Compared with the prior art, the radio interference time domain law statistical method, the device, the equipment and the storage medium disclosed by the embodiment of the invention calculate 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 radio interference of the corona discharge of the wire is mastered, and reference is provided for the prediction analysis of the radio interference of the direct current circuit and the structure selection of the wire.
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Fig. 1 is a flowchart of a method for counting time domain radio interference laws according to an embodiment of the present invention;
fig. 2 is a flowchart of another radio interference time domain rule statistic method according to an embodiment of the present invention;
FIG. 3 is a graph comparing voltage waveforms provided by an embodiment of the present invention;
FIG. 4 is a graph of quasi-peak contrast provided by an embodiment of the present invention;
fig. 5 is a block diagram illustrating a structure of a radio interference time domain rule statistic apparatus according to an embodiment of the present invention;
FIG. 6 is a block diagram of a voltage pulse sequence building block according to an embodiment of the present invention;
fig. 7 is a block diagram of a magnitude sequence constructing 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 radio interference time domain rule statistic apparatus according to an embodiment of the present invention;
fig. 10 is a block diagram of an electric field time domain rule statistic module according to an embodiment of the present invention;
FIG. 11 is a block diagram 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 statistic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart of a method for counting time domain radio interference laws according to an embodiment of the present invention.
The radio interference time domain rule statistical method can be executed through a client, and the client can be a computer, a mobile phone, a tablet and other user terminal equipment; the client can be loaded with various applications including an application of a pulse sequence generation class and a 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 and frequency domain waveforms of various signals, and for interacting with a user; the processor is used for generating time domain waveforms and frequency domain waveforms of various signals and controlling the display of a data interface on a display screen.
The method comprises the following steps of S11-S13:
s11, constructing a voltage pulse sequence of the radio interference measurement voltage;
s12, performing space attenuation processing on the voltage pulse sequence;
and S13, calculating to obtain a radio interference electric field time domain waveform sequence according to the voltage pulse sequence after the spatial attenuation processing.
In step S11, a voltage pulse sequence of the radio interference measurement voltage is constructed at the client according to the distribution characteristics of the radio interference voltage, and the voltage pulse sequence of the radio interference measurement voltage can be obtained quickly, accurately and comprehensively without acquiring the voltage pulse of the radio interference actually occurring.
In step S12, the principle of spatial attenuation is as follows: assuming that there are M discharge points on the wire, the voltage of radio interference at each discharge pointThe waveform can be generated according to a voltage pulse sequence, and the attenuation function of the waveform is close to the exponential distribution u in consideration of the obvious nonlinear characteristic of the change of the radio interference measurement voltage along with the horizontal distanceMp＝upie-κlWherein, the coefficient k is defined as the attenuation coefficient of the radio interference peak and is taken as 1.94, uMpFor measuring the amplitude of the radio interference pulse at the point upiIs 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 characterized in that a radio interference electric field time domain waveform sequence is obtained through calculation according to a voltage pulse sequence subjected to space attenuation treatment by constructing the voltage pulse sequence of the radio interference measurement voltage and performing space 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 radio interference of the corona discharge of the wire is mastered, and reference is provided for the prediction analysis of the radio interference of the direct current circuit and the structure selection of the wire.
In one embodiment, the constructing the voltage pulse sequence of the radio interference measurement voltage in step S11 specifically includes steps S111 to S113:
s111, constructing a voltage pulse amplitude sequence of the radio interference measurement voltage;
s112, constructing a pulse time interval sequence of the 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 of the radio interference measurement voltage, a plurality of pulse amplitudes are obtained through calculation 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 step S111 of constructing a voltage pulse amplitude sequence of the radio interference measurement voltage includes steps S1111 to S1115:
s1111, an amplitude function construction step: constructing a voltage pulse amplitude generation function, and satisfying the following formula:
wherein, mupRepresenting a preset average value, sigma, of the amplitude of the voltage pulsespRepresenting a predetermined standard deviation of the amplitude of the voltage pulse, upmRepresenting the amplitude of the mth voltage pulse, 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 at [0,1] as the value of the parameter C;
s1113, calculating the pulse amplitude: solving the voltage pulse amplitude generating function to obtain a voltage pulse amplitude;
s1114, a 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 measuring voltage according to the N voltage pulse amplitudes.
Specifically, the generation principle of the voltage pulse amplitude of the radio interference measurement voltage is as follows:
the probability density distribution of the voltage pulse amplitude of the radio interference measurement voltage approximately meets the log-normal distribution, and the expression is as follows:
wherein u ispRepresenting the measured voltage pulse amplitude, mupAnd σpThe mean and standard deviation of the logarithm of the amplitude are respectively represented, and the probability distribution function corresponding to the amplitude of the voltage pulse is represented as:
according to the definition of the probability distribution function, F (u)pm) Is between 0 and 1, if the random number C is made equal to F (u) by generating a random number C between 0 and 1pm) Then, there are:
generating random number C for multiple times, and repeatedly solving the above formula to obtain multiple pulse amplitudes u satisfying lognormal distributionpm(m is 1, 2, … …, N) to form a voltage pulse amplitude sequence, where N is the number of pulses that need to be constructed.
In addition, μpAnd σpThe specific value is related to the diameter of the wire and can be set according to the actual situation.
In one embodiment, the constructing the pulse time interval sequence in step S112 specifically includes steps S1121 to S1125:
s1121, time function construction step: constructing a pulse time interval generating function, and satisfying the following formula:
wherein, muiRepresenting a preset mean value of the time interval of the pulses, σiIndicating a preset standard deviation of the pulse time interval, timRepresenting the m-th pulse interval, m being a positive integer less than or equal to N, CtiRepresents a random constant between 0 and 1;
s1122, a second initialization step: in [0,1]]Randomly taking a value as a parameter CtiA value of (d);
s1123, a time interval calculation step: solving the pulse time interval generating function to obtain a pulse time interval;
s1124, a second repetition calculation step: repeating the second initializing step and the time interval calculating step until N pulse time intervals are obtained;
s1125, a 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.
Specifically, the principle of generation of a 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, and the expression thereof is:
wherein, tiRepresenting the pulse time interval, muiAnd σiMean and standard deviation of the time intervals are indicated, respectively. The probability distribution function corresponding to the pulse time interval is expressed as:
by generating a random number C between 0 and 1tiLet F (t)im)＝CtiNamely, the following steps are provided:
by generating random numbers C multiple timestiRepeatedly solving the above formula to obtain a plurality of pulse time intervals tim(m-1, 2, … …, N) to form a sequence of pulse time intervals.
Need to make sure thatNote that μiAnd σiThe specific numerical 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 interval in the pulse time interval sequence, wherein the pulse time interval is smaller than the pulse time interval with the preset pulse width.
In particular if the value of the pulse time interval is smaller than the pulse width t of the radio interferenced(about 350ns) the value of the pulse time interval is discarded to ensure that the subsequently constructed pulse sequences of the radio interference do not have pulse overlap.
Further, the pulse shape of the radio interference exhibits bi-exponential pulses, and from the sequence of voltage pulse amplitudes and the sequence of pulse time intervals of the generated radio interference, a random sequence of radio interference measurement voltages can be constructed:
wherein u isT(T) represents a time-series of pulses, T being the duration of the pulse-series, K being 2.73 and α being 1.214 × 107; β is 3.508 × 107. T generated in the above steps S1111 to S1115 and steps S1121 to S1125imAnd upmAnd substituting the random sequence into the formula to obtain the random sequence of the radio interference measurement voltage pulse.
In one embodiment, the step S13 of calculating a radio interference electric field time domain waveform sequence according to the voltage pulse sequence after the spatial attenuation processing 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 after the spatial attenuation processing 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 time-domain waveform of the single-pulse radio interference electric field in step S131 specifically includes steps S1311 to S1314:
s1311, extracting a time domain waveform of the voltage pulse;
s1312, carrying out Fourier transformation 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 the radio interference electric field corresponding to the voltage pulse according to the frequency domain result of the voltage pulse;
and S1314, obtaining a radio interference electric field time domain waveform corresponding to the voltage pulse according to the frequency domain result of the radio interference electric field corresponding to the voltage pulse.
Specifically, single-pulse analysis is carried out on the voltage pulse sequence to obtain the time domain waveform u of the single pulses(t) obtaining a corresponding frequency domain result U by using fast-reading Fourier transforms(j ω), according to the relationship between the radio interference voltage and the radio interference field strength of the antenna test obtained in advance, the frequency domain result of the field strength of the single radio interference can be obtained, which is specifically expressed as:
where, ω is angular frequency, R and C' are the sampling resistance and equivalent capacitance of the test antenna, respectively, and tdEThe duration of the radio interference electric field pulse.
The specific flow of the radio interference time domain law statistical method can also be seen in fig. 2.
To further illustrate the accuracy of the statistical law according to the radio interference time domain law statistical method, the correctness is verified by the test result according to the experimental test as follows:
referring to fig. 3, the left side of fig. 3 is a waveform of radio interference measurement voltage obtained by an experimental test, and the right side is a waveform of radio interference measurement voltage counted by the method, for example, as shown in fig. 4, the experimental test and the result of the quasi-peak radio interference under wires of different diameters calculated by the quasi-peak method obtained by the method are within a range of 2dB (μ V/m), the accuracy of the rule counted by the method for counting the radio interference time domain rule is verified, and the radio interference time domain rule counted by the method can be used for analyzing the dc corona discharge radio interference of the power transmission line and providing a reference for the 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 by the constructed radio interference test voltage random pulse sequence, obtains the time domain characteristic rule of the radio interference, grasps the whole frequency band characteristic of the wire corona discharge radio interference, and provides reference for the prediction analysis of the radio interference of the direct current circuit and the wire structure type selection.
Referring to fig. 5, fig. 5 is a block diagram of a radio interference time domain law statistics apparatus according to an embodiment of the present invention. The radio interference time domain law statistic device 20 includes:
a voltage pulse sequence construction module 21, configured to construct a voltage pulse sequence of the radio interference measurement voltage;
the spatial attenuation processing module 22 is used for performing spatial attenuation processing on the voltage pulse sequence;
and the electric field time domain rule statistic 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 building module 21, a voltage pulse sequence of the radio interference measurement voltage is built 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 the voltage pulse of the radio interference which actually occurs.
In space attenuation processingIn block 22, the principle of spatial attenuation is as follows: assuming that M discharge points are arranged on the wire, the voltage waveform of the radio interference of each discharge point can be generated according to the voltage pulse sequence, and considering that the change of the radio interference measurement voltage along with the horizontal distance presents obvious nonlinear characteristics, the attenuation function of the voltage waveform approaches the exponential distribution uMp＝upie-κlWherein, the coefficient k is defined as the attenuation coefficient of the radio interference peak and is taken as 1.94, uMpFor measuring the amplitude of the radio interference pulse at the point upiIs the radio interference voltage amplitude at the ith discharge point.
In the electric field time domain rule statistic module 23, the time domain characteristic of the radio interference is obtained by processing the constructed voltage pulse sequence.
Compared with the prior art, the radio interference time domain rule statistical device disclosed by the embodiment of the invention is used for calculating the radio interference electric field time domain waveform sequence according to the voltage pulse sequence subjected to the space attenuation treatment by constructing the voltage pulse sequence of the radio interference measurement voltage and performing the space 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 radio interference of the corona discharge of the wire is mastered, and reference is provided for the prediction analysis of the radio interference of the direct current circuit and the structure selection of the wire.
In one embodiment, referring to fig. 6, the voltage pulse sequence building 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 the radio interference measurement voltage;
a pulse sequence construction unit 213 for constructing a radio interference measurement voltage pulse sequence based on said voltage pulse amplitude sequence and said pulse time interval sequence
Specifically, according to the distribution characteristics of the pulse amplitude of the radio interference measurement voltage, a plurality of pulse amplitudes are obtained through calculation 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 an embodiment, referring to fig. 7, the amplitude sequence constructing unit 211 specifically includes:
a magnitude function constructing subunit 2111, configured to perform the magnitude function constructing step: constructing a voltage pulse amplitude generation function, and satisfying the following formula:
wherein, mupRepresenting a preset average value, sigma, of the amplitude of the voltage pulsespRepresenting a predetermined standard deviation of the amplitude of the voltage pulse, upmRepresenting the amplitude of the mth voltage pulse, 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, configured to perform a first initialization step: randomly taking a value at [0,1] as the value of the parameter C;
a pulse amplitude value operator unit 2113 for performing the pulse amplitude value calculation step: solving the voltage pulse amplitude generating function to obtain a voltage pulse amplitude;
a first repetition calculation subunit 2114 configured to perform the 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 configured to perform the amplitude sequence construction steps of: and constructing a voltage pulse amplitude sequence of the radio interference measuring voltage according to the N voltage pulse amplitudes.
Specifically, the generation principle of the voltage pulse amplitude of the radio interference measurement voltage is as follows:
the probability density distribution of the voltage pulse amplitude of the radio interference measurement voltage approximately meets the log-normal distribution, and the expression is as follows:
wherein u ispRepresenting the measured voltage pulse amplitude, mupAnd σpThe mean and standard deviation of the logarithm of the amplitude are respectively represented, and the probability distribution function corresponding to the amplitude of the voltage pulse is represented as:
according to the definition of the probability distribution function, F (u)pm) Is between 0 and 1, if the random number C is made equal to F (u) by generating a random number C between 0 and 1pm) Then, there are:
generating random number C for multiple times, and repeatedly solving the above formula to obtain multiple pulse amplitudes u satisfying lognormal distributionpm(m is 1, 2, … …, N) to form a voltage pulse amplitude sequence, where N is the number of pulses that need to be constructed.
In addition, μpAnd σpThe specific value is related to the diameter of the wire and can be set according to the actual situation.
In an embodiment, referring to fig. 8, the time interval sequence constructing unit 212 specifically includes:
a time function constructing subunit 2121 configured to perform the time function constructing step: constructing a pulse time interval generating function, and satisfying the following formula:
wherein, muiRepresenting a preset mean value of the time interval of the pulses, σiIndicating a preset standard deviation of the pulse time interval, timRepresenting the m-th pulse interval, m being a positive integer less than or equal to N, CtiRepresents a random constant between 0 and 1;
a second initialization subunit 2122, configured to perform a second initialization step: in [0,1]]Randomly taking a value as a parameter CtiA value of (d);
a time interval calculation subunit 2123 configured to perform the time interval calculation step of: 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 of: 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 configured to perform the time interval sequence construction step of: a sequence of pulse time intervals of the radio interference measurement voltage is constructed from the N pulse time intervals.
Specifically, the principle of generation of a 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, and the expression thereof is:
wherein, tiRepresenting the pulse time interval, muiAnd σiMean and standard deviation of the time intervals are indicated, respectively. The probability distribution function corresponding to the pulse time interval is expressed as:
by generating a random number C between 0 and 1tiLet F (t)im)＝CtiNamely, the following steps are provided:
by generating random numbers C multiple timestiRepeatedly solving the above formula to obtain a plurality of pulse time intervals tim(m-1, 2, … …, N) to form a sequence of pulse time intervals.
In addition, μiAnd σiThe specific numerical value of (2) is preset and can be set according to actual conditions.
In one embodiment, referring to fig. 9, a time interval deleting module 24 is further included for deleting the pulse time intervals in the pulse time interval sequence, which are less than the preset pulse width.
In particular if the value of the pulse time interval is smaller than the pulse width t of the radio interferenced(about 350ns) the value of the pulse time interval is discarded to ensure that the subsequently constructed pulse sequences of the radio interference do not have pulse overlap.
Further, the pulse shape of the radio interference exhibits bi-exponential pulses, and from the sequence of voltage pulse amplitudes and the sequence of pulse time intervals of the generated radio interference, a random sequence of radio interference measurement voltages can be constructed:
wherein u isT(T) represents a time-series of pulses, T being the duration of the pulse-series, K being 2.73 and α being 1.214 × 107; β is 3.508 × 107. T generated in the above steps S1111 to S1115 and steps S1121 to S1125imAnd upmThe radio interference measurement power can be obtained by substituting the formulaA random sequence of pressure pulses.
In one embodiment, referring to fig. 10, the electric field time domain law statistics module 23 specifically includes:
the electric field time domain waveform calculating unit 231 performs 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 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, extracting a time domain waveform of the voltage pulse;
a pulse frequency domain result calculating subunit 2312, performing 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 calculating subunit 2313, obtaining a frequency domain result of the radio interference electric field corresponding to the voltage pulse according to the frequency domain result of the voltage pulse;
the electric field time domain waveform calculating subunit 2314 obtains the radio interference electric field time domain waveform corresponding to the voltage pulse according to the frequency domain result of the radio interference electric field corresponding to the voltage pulse.
Specifically, single-pulse analysis is carried out on the voltage pulse sequence to obtain the time domain waveform u of the single pulses(t) obtaining a corresponding frequency domain result U by using fast-reading Fourier transforms(j ω), according to the relationship between the radio interference voltage and the radio interference field strength of the antenna test obtained in advance, the frequency domain result of the field strength of the single radio interference can be obtained, which is specifically expressed as:
where ω is the angular frequencyR and C' are respectively the sampling resistance and equivalent capacitance of the test antenna, tdEThe 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 by the constructed radio interference test voltage random pulse sequence, obtains the time domain characteristic rule of the radio interference, grasps the whole frequency band characteristic of the wire corona discharge radio interference, and provides reference for the prediction analysis of the radio interference of the direct current circuit and the wire structure type selection.
It should be noted that the working principle of the radio interference time domain rule statistic device 20 can refer to the radio interference time domain rule statistic method described in any of the above embodiments, and details thereof are not repeated 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, where the processor 31, when executing the computer program, implements the steps in the radio interference time domain rule statistics method embodiment, such as the steps S11 to S13 shown in fig. 1; alternatively, the processor 31, when executing the computer program, implements the functions of the modules in the above device embodiments, such as the voltage pulse sequence building module 21.
Illustratively, the computer program may be divided into one or more modules, which are stored in the memory 32 and executed by the processor 31 to accomplish the present invention. The one or more modules may be a series of instruction segments of a computer program capable of performing specific functions, and the instruction segments are used for describing the execution process 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 law statistics module 23, and the specific functions of each module are as follows:
a voltage pulse sequence construction module 21, configured to construct a voltage pulse sequence of the radio interference measurement voltage;
the spatial attenuation processing module 22 is used for performing spatial attenuation processing on the voltage pulse sequence;
and the electric field time domain rule statistic 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.
For the specific working process of each module, reference may be made to the working process of the radio interference time domain law statistics apparatus 20 described in the foregoing embodiment, which is not described herein again.
The radio interference time domain law statistic device 30 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The radio interference time domain law statistics apparatus 30 may include, but is not limited to, a processor 31 and a memory 32. It will be understood by those skilled in the art that the schematic diagram is merely an example of the radio interference time domain law statistics apparatus, and does not constitute a limitation to the radio interference time domain law statistics apparatus 30, and may include more or less components than those shown in the figure, or combine some components, or different components, for example, the radio interference time domain law statistics apparatus 30 may further include an input and output device, a network access device, a bus, and the like.
The Processor 31 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, etc. The general processor may be a microprocessor or the processor may be any conventional processor, and the processor 31 is a control center of the radio interference time domain rule statistics apparatus 30, and various interfaces and lines are used to connect various parts of the whole radio interference time domain rule statistics apparatus 30.
The memory 32 may be used to store the computer programs and/or modules, and the processor 31 implements various functions of the radio interference time domain law statistics apparatus 30 by running or executing the computer programs and/or modules stored in the memory 32 and calling the data stored in the memory 32. The memory 32 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program (such as a voltage pulse sequence generation function) required by at least one function, and the like; the storage data area may store data created according to use of the computer, and the like. Further, the memory 32 may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The integrated module of the radio interference time domain law statistics device 30 may be stored in a computer readable storage medium if it is implemented in the form of a software functional unit and sold or used as a stand-alone product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes 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 (RAM), or the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A radio interference time domain law statistical method is characterized by comprising the following steps:
constructing a voltage pulse sequence of the radio interference measurement voltage;
performing spatial attenuation processing on the voltage pulse sequence;
and calculating to obtain a radio interference electric field time domain waveform sequence according to the voltage pulse sequence after the spatial attenuation treatment.
2. The method according to claim 1, wherein the constructing a voltage pulse sequence of the radio interference measurement voltage specifically comprises:
constructing a voltage pulse amplitude sequence of the radio interference measurement voltage;
constructing a sequence of pulse time intervals of the radio interference measurement voltage;
and constructing a radio interference measurement voltage pulse sequence according to the voltage pulse amplitude sequence and the pulse time interval sequence.
3. The method according to claim 2, wherein the step of constructing the voltage pulse amplitude sequence of the radio interference measurement voltage comprises:
and an amplitude function construction step: constructing a voltage pulse amplitude generation function, and satisfying the following formula:
wherein, mupRepresenting a preset average value, sigma, of the amplitude of the voltage pulsespRepresenting a predetermined standard deviation of the amplitude of the voltage pulse, upmRepresenting the amplitude of the mth voltage pulse, 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 at [0,1] as the value of the parameter C;
and a pulse amplitude calculation step: solving the voltage pulse amplitude generating function to obtain a voltage pulse amplitude;
a first iterative calculation 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 measuring voltage according to the N voltage pulse amplitudes.
4. The method according to claim 2, wherein the constructing the pulse time interval sequence specifically comprises:
a time function construction step: constructing a pulse time interval generating function, and satisfying the following formula:
wherein, muiRepresenting a preset mean value of the time interval of the pulses, σiIndicating a preset standard deviation of the pulse time interval, timRepresenting the m-th pulse interval, m being a positive integer less than or equal to N, CtiRepresents a random constant between 0 and 1;
a second initialization step: in [0,1]]Randomly taking a value as a parameter CtiA value of (d);
a time interval calculation step: solving the pulse time interval generating function to obtain a pulse time interval;
a second repetition calculation step: repeating the second initializing step and the time interval calculating step until N pulse time intervals are obtained;
time interval sequence construction: a sequence of pulse time intervals of the radio interference measurement voltage is constructed from the N pulse time intervals.
5. The method of claim 2, wherein prior to the constructing the radio interference measurement voltage pulse sequence from the voltage pulse amplitude sequence and the pulse time interval sequence, further comprising:
and deleting the pulse time interval in the pulse time interval sequence, wherein the pulse time interval is smaller than the pulse time interval with the preset pulse width.
6. The method according to claim 1, wherein the step of calculating a radio interference electric field time domain waveform sequence according to the voltage pulse sequence after spatial attenuation processing comprises:
performing single-pulse radio interference electric field time domain waveform calculation operation on each voltage pulse in the voltage pulse sequence after the spatial attenuation processing 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.
7. The method for statistics of radio interference time domain regularity of claim 6, wherein the operation of calculating the time domain waveform of the single-pulse radio interference electric field specifically comprises:
extracting a time domain waveform of the voltage pulse;
fourier transformation is carried out 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 radio interference electric field time domain waveform corresponding to the voltage pulse according to a frequency domain result of the radio interference electric field corresponding to the voltage pulse.
8. 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 carrying out spatial attenuation processing on the voltage pulse sequence;
and the electric field time domain rule statistic module is used for calculating to obtain a radio interference electric field time domain waveform sequence according to the voltage pulse sequence after the spatial attenuation processing.
9. 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 one of claims 1 to 7 when executing the computer program.
10. A storage medium, characterized in that the storage medium comprises a stored computer program, wherein when the computer program runs, the apparatus on which the storage medium is located is controlled to execute the radio interference time domain law statistical method according to any one of claims 1 to 7.
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