CN116346551A - Data transmission optimization method of isolation lifting device for power monitoring system - Google Patents
Data transmission optimization method of isolation lifting device for power monitoring system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
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Abstract
The invention belongs to the field of power data optimization, and particularly relates to a data transmission optimization method of an isolation lifting device for a power monitoring system, which comprises the following steps of: step one: constructing a channel model for remote communication of power system fault monitoring data; step two: adopting multipath component recombination and passive time mirror turnover technology to inhibit intersymbol interference; step three: and designing a baud interval equalizer to perform channel equalization optimization, and performing simulation experiments. The invention provides a method for optimizing a communication channel of remote communication of fault monitoring data of an electric power system of a gas station based on the Bode interval equalization technology, which takes a minimum mean square error criterion as a decision basis to perform communication channel equalization optimization.
Description
Technical Field
The invention belongs to the field of power data optimization, and particularly relates to a data transmission optimization method of an isolation lifting device for a power monitoring system.
Background
The power system of the natural gas compressor station is an infrastructure power system of the gas compressor station which ensures that compressor device equipment in the gas compressor station runs stably and reliably and is easy to generate faults under the long-term high-load working state, the power system of the gas compressor station needs to be monitored in real time on line, and monitoring data is transmitted to a control center through a remote satellite communication system for on-line fault diagnosis and analysis, so that the stable and reliable operation of the power system is ensured.
The bandwidth occupied by the spread spectrum code sequence in the remote satellite communication transmission channel of the fault monitoring data of the gas station power system is large, multipath effect is easy to generate in the channel allocation process, intersymbol interference is caused, communication performance is reduced, the fault data output error code of the power system is high, remote communication channel optimization is needed, and the design of the optimization method for researching the remote communication transmission channel of the fault monitoring data of the power system by improving communication quality is of great significance in ensuring stable operation of the gas station power system.
Disclosure of Invention
In order to solve or improve the problems, the invention provides a data transmission optimization method of an isolation lifting device for an electric power monitoring system, which comprises the following specific technical scheme:
the invention provides a data transmission optimization method of an isolation lifting device for an electric power monitoring system, which comprises the following steps:
step one: constructing a channel model for remote communication of power system fault monitoring data;
step two: adopting multipath component recombination and passive time mirror turnover technology to inhibit intersymbol interference;
step three: and designing a baud interval equalizer to perform channel equalization optimization, and performing simulation experiments.
Preferably, the construction of the channel model for remote communication of the fault monitoring data of the power system specifically includes the following steps:
step S1: performing high data rate information transmission and distribution, performing serial-parallel conversion on direct sequence power system fault monitoring data remote communication by adopting QAM modulation, inputting initial code elements of a communication system, and obtaining time-varying impulse response of a communication channel from serial-parallel conversion results;
step S2: performing copy autocorrelation on a received signal, performing delay expansion on a communication channel by adopting a modulation filtering method, and obtaining a direct sequence spread spectrum code output by power system fault monitoring data after the delay expansion;
step S3: inputting an initial modulation code sequence, wherein BPS modulation code signals output after fault data are received by a remote terminal consist of a plurality of pulses with different time delays, and obtaining the relation between the instantaneous frequency and time of the fault monitoring data of the power system and the output error of a channel through the pulses with different time delays;
step S4: based on the relationship between the instantaneous frequency and the output error of the channel obtained in the step S3, a time-varying impulse response and a transmission channel model of the remote communication of the fault monitoring data of the gas station power system are obtained under the condition of a discrete multipath channel.
Preferably, the multipath component reorganization includes: the influence of multipath fading is eliminated by using the useful information of multipath signals, and intersymbol interference caused by channels is reduced.
Preferably, the passive time mirror flipping technique is used to adaptively focus at a target location in a complex multipath scattering environment and reconstruct in the form of an inverted wave.
Preferably, the specific operations of intersymbol interference suppression using multipath component recombination and passive time mirror flipping techniques are as follows:
adopting the multipath component recombination and passive time mirror turnover technology to inhibit intersymbol interference in an equivalent low-pass channel, and carrying out intersymbol interference filtering on remote communication signals of the power system by dynamically outputting fault monitoring data code elements of the power system to obtain a signal model of filtering output;
under the condition that intersymbol interference causes Doppler spread, discretization processing and statistical description are carried out on an output signal of a remote communication system of a power system, and amplitude limiting processing is carried out on an OFDM signal to obtain an output eigenwave.
Preferably, the function of designing the baud-interval equalizer for channel equalization optimization is as follows:
and on the aspect of intersymbol interference suppression by adopting the multipath component recombination and passive time mirror turnover technology, carrying out the optimization design of a remote communication transmission channel of the fault monitoring data of the gas station power system, and obtaining the relation between the propagation time and the propagation loss of a channel model by adopting a channel equalization method based on baud interval equalization.
Preferably, after the relationship between the propagation time and the propagation loss of the channel model is obtained, a direct sequence spread spectrum method is adopted to perform equalization design of the communication channel, so as to obtain a channel impulse response function after direct sequence spread spectrum processing.
Preferably, the direct sequence spread spectrum method specifically uses a spread spectrum code sequence with a high code rate to spread the spectrum of a signal at a transmitting end, uses the same spread spectrum code sequence to despread at a receiving end, and restores the spread spectrum signal to original information.
The beneficial effects of the invention are as follows: the invention provides a method for optimizing a remote communication transmission channel of fault monitoring data of an air compressor power system based on a Bode interval equalization technology, which is used for constructing a channel model of the remote communication of the fault monitoring data of the power system, adopting a multipath component recombination and passive time mirror overturning technology to carry out intersymbol interference suppression, designing the Bode interval equalizer, carrying out communication channel equalization optimization by taking a minimum mean square error criterion as a decision basis, and carrying out the remote communication transmission of the fault monitoring data of the air compressor power system.
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FIG. 1 is a flow chart of the present invention;
fig. 2 is a flow chart of constructing a channel model for power system fault-monitoring data remote communication.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. 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.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In order to solve the problem of higher error code of fault data output of a power system, a data transmission optimization method of an isolation lifting device for a power monitoring system shown in fig. 1 is provided, which comprises the following steps:
step one: constructing a channel model for remote communication of power system fault monitoring data;
step two: adopting multipath component recombination and passive time mirror turnover technology to inhibit intersymbol interference;
step three: and designing a baud interval equalizer to perform channel equalization optimization, and performing simulation experiments.
In the first step, a transmission channel model and a time-varying impulse response of the remote communication of the fault monitoring data of the gas station power system can be obtained after the channel model of the remote communication of the fault monitoring data of the power system is constructed; in the second step, adopting multipath component recombination and passive time mirror turnover technology to inhibit intersymbol interference in an equivalent low-pass channel, and carrying out intersymbol interference filtering on remote communication signals of the power system by dynamically outputting fault monitoring data code elements of the power system to obtain a signal model of filtering output; thirdly, adopting a direct sequence spread spectrum method to carry out equalization design of a communication channel to obtain a channel impulse response function after direct sequence spread spectrum processing; the method for remotely transmitting the fault monitoring data of the gas station power system has the advantages of strong anti-interference capability, good channel equalization, low error rate of the fault monitoring data output and high application value in remote communication and diagnosis of the fault monitoring data of the power system.
As a specific embodiment of the present invention, constructing a channel model for remote communication of power system fault monitoring data specifically includes the steps of:
step S1: performing high data rate information transmission and distribution, performing serial-parallel conversion on direct sequence power system fault monitoring data remote communication by adopting QAM modulation, inputting initial code elements of a communication system, and obtaining time-varying impulse response of a communication channel from serial-parallel conversion results;
step S2: performing copy autocorrelation on a received signal, performing delay expansion on a communication channel by adopting a modulation filtering method, and obtaining a direct sequence spread spectrum code output by power system fault monitoring data after the delay expansion;
step S3: inputting an initial modulation code sequence, wherein BPS modulation code signals output after fault data are received by a remote terminal consist of a plurality of pulses with different time delays, and obtaining the relation between the instantaneous frequency and time of the fault monitoring data of the power system and the output error of a channel through the pulses with different time delays;
step S4: based on the relationship between the instantaneous frequency and the output error of the channel obtained in the step S3, a time-varying impulse response and a transmission channel model of the remote communication of the fault monitoring data of the gas station power system are obtained under the condition of a discrete multipath channel.
According to the specific steps of constructing the channel model for remote communication of the fault monitoring data of the power system, referring to fig. 2, it can be known that when data is received, information transmission and distribution with high data rate are performed first to obtain a time-varying impulse response of a communication channel; copy autocorrelation is carried out on the received signal to obtain a direct sequence spread spectrum code of the power system fault monitoring data output; then obtaining the relation between the instantaneous frequency and time of the power system fault monitoring data and the output error of the channel; finally, a time-varying impulse response and a transmission channel model of the remote communication of the fault monitoring data of the gas station power system are obtained.
As a specific embodiment of the present invention, multipath component recombination includes: the influence of multipath fading is eliminated by using the useful information of multipath signals, and intersymbol interference caused by channels is reduced.
The effect of multipath fading is eliminated by using useful information of the multipath signal. During propagation, the signals are subject to reflection, diffraction and scattering by various environments, so that the signals reaching the receiver are superposition of many path signals, and the envelopes of the superposition of the multipath signals in the absence of line-of-sight propagation obey Rayleigh distribution. When a line-of-sight propagation path is included in the multipath signal, the multipath signal follows a rice distribution. In a channel in which multipath transmission exists, due to inconsistent transmission time delays and non-ideal transmission characteristics of each path, the received signal is stretched in time due to the influence of channel noise, and thus extends to adjacent symbols, so that the symbols overlap, and the channel can cause intersymbol interference.
As a specific embodiment of the present invention, passive time mirror flipping techniques are used to adaptively focus on a target location in a complex multipath scattering environment and reconstruct it as an inverted wave.
Aiming at the multipath interference problem in the time reversal technology processing, the high target detection probability is achieved by adopting rich scattering in the multipath environment, the time reversal technology is applied to the actual engineering, and the time domain model expression is deduced. The performance of the DOA estimation of the detection probability and the target after being processed by the time reversal technology is superior to that of the traditional method. The time reversal technology originates from the extension and popularization of a phase conjugate mirror in the optical field, is applied to the electromagnetic field, combines the basic principle of electromagnetic wave transmission and the array signal processing technology, has the space-time focusing characteristic, adaptively focuses on a target position in a complex multipath scattering environment, and is reconstructed in the form of inverted waves, so that the resolution which is far greater than that achieved by a common array aperture can be obtained, and the resolution of a system is greatly improved.
As a specific embodiment of the present invention, specific operations for intersymbol interference suppression using multipath component recombination and passive time mirror flipping techniques are as follows:
adopting multipath component recombination and passive time mirror turnover technology to inhibit intersymbol interference in an equivalent low-pass channel, and carrying out intersymbol interference filtering on remote communication signals of an electric power system by dynamically outputting fault monitoring data code elements of the electric power system to obtain a signal model of filtering output;
under the condition that the intersymbol interference causes Doppler spread, discretization processing and statistical description are carried out on an output signal of a remote communication system of a power system, a noise influence judgment threshold y can be set, when a signal model is smaller than y, the intersymbol interference exists in the output signal, when the signal model is larger than y, the intersymbol interference is effectively restrained, passive time mirror inversion processing is adopted, and the OFDM signal is subjected to amplitude limiting processing to obtain an output eigenwave.
As a specific embodiment of the present invention, the function of designing the baud-interval equalizer to perform channel equalization optimization is as follows:
on the aspect of carrying out intersymbol interference suppression by adopting multipath component recombination and passive time mirror overturning technology, carrying out remote communication transmission channel optimization design on fault monitoring data of an electric power system of a gas station, adopting a channel equalization method based on baud interval equalization, constructing a second-order FIR filter according to a nonlinear equalization method in a remote communication channel distribution model of the electric power system to carry out forward filter design, and giving out a filter coefficient beta= [ B, B ] of channel distribution, so that an output signal vector meets y=b x, and the relation between the propagation time and the propagation loss of the channel model is obtained.
As a specific embodiment of the present invention, after the relationship between the propagation time and the propagation loss of the channel model is obtained, a direct sequence spread spectrum method is adopted to perform equalization design of the communication channel, so as to obtain a channel impulse response function after direct sequence spread spectrum processing, and the direct sequence spread spectrum method specifically uses a spread spectrum code sequence with a high code rate to spread the spectrum of the signal at the transmitting end, uses the same spread spectrum code sequence to perform despreading at the receiving end, and restores the spread spectrum signal to original information.
Those of ordinary skill in the art will appreciate that the elements of the examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the elements of the examples have been described generally in terms of functionality in the foregoing description to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in this application, it should be understood that the division of units is merely a logic function division, and there may be other manners of division in practical implementation, for example, multiple units may be combined into one unit, one unit may be split into multiple units, or some features may be omitted.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (8)
1. The data transmission optimization method of the isolation lifting device for the power monitoring system is characterized by comprising the following steps of:
step one: constructing a channel model for remote communication of power system fault monitoring data;
step two: adopting multipath component recombination and passive time mirror turnover technology to inhibit intersymbol interference;
step three: and designing a baud interval equalizer to perform channel equalization optimization, and performing simulation experiments.
2. The method for optimizing data transmission of an isolated lift device for an electrical power monitoring system of claim 1, wherein: the construction of the channel model for remote communication of the fault monitoring data of the power system specifically comprises the following steps:
step S1: performing high data rate information transmission and distribution, performing serial-parallel conversion on direct sequence power system fault monitoring data remote communication by adopting QAM modulation, inputting initial code elements of a communication system, and obtaining time-varying impulse response of a communication channel from serial-parallel conversion results;
step S2: performing copy autocorrelation on a received signal, performing delay expansion on a communication channel by adopting a modulation filtering method, and obtaining a direct sequence spread spectrum code output by power system fault monitoring data after the delay expansion;
step S3: inputting an initial modulation code sequence, wherein BPS modulation code signals output after fault data are received by a remote terminal consist of a plurality of pulses with different time delays, and obtaining the relation between the instantaneous frequency and time of the fault monitoring data of the power system and the output error of a channel through the pulses with different time delays;
step S4: based on the relationship between the instantaneous frequency and the output error of the channel obtained in the step S3, a time-varying impulse response and a transmission channel model of the remote communication of the fault monitoring data of the gas station power system are obtained under the condition of a discrete multipath channel.
3. The method for optimizing data transmission of an isolated lift device for an electrical power monitoring system of claim 1, wherein: multipath component recombination includes: the influence of multipath fading is eliminated by using the useful information of multipath signals, and intersymbol interference caused by channels is reduced.
4. The method for optimizing data transmission of an isolated lift device for an electrical power monitoring system of claim 1, wherein: the passive time mirror flipping technique is used to adaptively focus on a target location in a complex multipath scattering environment and reconstruct it as an inverted wave.
5. A method of optimizing data transmission of an isolated lift device for a power monitoring system according to claim 3, wherein: the specific operation of intersymbol interference suppression by adopting multipath component recombination and passive time mirror flip technology is as follows:
adopting the multipath component recombination and passive time mirror turnover technology to inhibit intersymbol interference in an equivalent low-pass channel, and carrying out intersymbol interference filtering on remote communication signals of the power system by dynamically outputting fault monitoring data code elements of the power system to obtain a signal model of filtering output;
under the condition that intersymbol interference causes Doppler spread, discretization processing and statistical description are carried out on an output signal of a remote communication system of a power system, and amplitude limiting processing is carried out on an OFDM signal to obtain an output eigenwave.
6. The method for optimizing data transmission of an isolated lift device for an electrical power monitoring system of claim 1, wherein: the function of designing the baud interval equalizer for channel equalization optimization is as follows:
and on the aspect of intersymbol interference suppression by adopting the multipath component recombination and passive time mirror turnover technology, carrying out the optimization design of a remote communication transmission channel of the fault monitoring data of the gas station power system, and obtaining the relation between the propagation time and the propagation loss of a channel model by adopting a channel equalization method based on baud interval equalization.
7. The method for optimizing data transmission of an isolated lift device for an electrical power monitoring system of claim 6, wherein: and after the relation between the propagation time and the propagation loss of the channel model is obtained, adopting a direct sequence spread spectrum method to carry out the equalization design of the communication channel, and further obtaining the channel impulse response function after the direct sequence spread spectrum processing.
8. The method for optimizing data transmission of an isolated lift device for an electrical power monitoring system of claim 7, wherein: the direct sequence spread spectrum method specifically uses a spread spectrum code sequence with a high code rate to spread the frequency spectrum of a signal at a transmitting end, uses the same spread spectrum code sequence to despread at a receiving end, and restores the spread spectrum signal into original information.
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