CN106559104B - Portable covered wire simulation box - Google Patents
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Abstract
The embodiment of the invention provides a portable covered wire simulation box, which is applied to a covered wire erection site and comprises: the device comprises a calculation module, a parameter storage module and a data transmission module; the data transmission module is respectively connected with the calculation module and the parameter storage module; the parameter storage module is used for storing the measured parameters of the covered wires of various types and the standard parameters corresponding to the covered wires of various types; the calculation module is used for receiving a selection instruction of the actual measurement parameters or the standard parameters of the covered wire to be detected, which is transmitted by the data transmission module, acquiring and selecting the actual measurement parameters or the standard parameters corresponding to the covered wire to be detected, which are indicated by the selection instruction, from the parameter storage module, and performing signal simulation on the signal sent by the remote transmission equipment at the sending end according to the parameters acquired from the calculation module. The portable covered wire simulation box provided by the embodiment of the invention has better reliability and flexibility for the transmission performance evaluation of the covered wire.
Description
Technical Field
The invention relates to the technical field of covered wire erection, in particular to a portable covered wire simulation box.
Background
In emergency tasks such as rescue and relief work, anti-terrorism maintenance and the like, the covered wire is widely applied due to the advantages of stable performance, strong anti-interference performance, convenience in erection, flexibility, low cost and the like. Because the teletransmission equipment kind is different, and the transmission performance of different length, different model covered wire is different, before setting up covered wire communication cable, will ensure that the circuit is unobstructed, need the transmission performance of covered wire to assess.
At present, the evaluation is usually realized by the experience of field setting personnel or laboratory pre-estimation. Because the remote transmission equipment is various in types and the performance of the covered wire is different, the reliability of the transmission performance evaluation by depending on experience is poor; in addition, although the transmission performance of the covered wire can be simulated through computing equipment in a laboratory, the field building support capability of the covered wire is limited and the flexibility is poor when the covered wire is simulated in the laboratory.
Disclosure of Invention
The invention provides a portable covered wire simulation box, which aims to solve the problems of poor reliability and poor flexibility of the existing covered wire transmission performance evaluation scheme.
In order to solve the above problems, the present invention discloses a portable covered wire simulation box applied to a covered wire erection site, the portable covered wire simulation box including: the device comprises a calculation module, a parameter storage module and a data transmission module; the data transmission module is respectively connected with the calculation module and the parameter storage module; the parameter storage module is used for storing the measured parameters of the covered wires of various types and the standard parameters corresponding to the covered wires of various types; the calculation module is used for receiving a selection instruction of the actual measurement parameter or the standard parameter of the covered wire to be detected, which is transmitted by the data transmission module, acquiring the actual measurement parameter or the standard parameter corresponding to the covered wire to be detected, which is indicated by the selection instruction, from the parameter storage module, and performing signal simulation on a signal sent by the sending-end remote transmission equipment according to the parameter acquired from the calculation module.
Preferably, a covered wire first interface and a covered wire second interface are arranged on the outer surface of the covered wire simulation box body; the first covered wire interface is connected with the transmitting end remote transmission equipment through the covered wire; the second covered wire interface is connected with the receiving end remote transmission equipment through the covered wire.
Preferably, the covered wire simulation box further comprises: the device comprises an analog-digital sampling module, a fast Fourier transform module, an inverse fast Fourier transform module and a digital-analog conversion module; the covered wire first interface is connected with the analog-digital sampling module, and the covered wire second interface is connected with the digital-analog conversion module; the fast Fourier transform module is respectively connected with the analog-digital sampling module and the calculation module; the fast Fourier inverse transformation module is respectively connected with the calculation module and the digital-to-analog conversion module.
Preferably, the analog-to-digital sampling module is configured to convert a signal sent by a sending-end remote transmission device into a digital signal, and send the digital signal to the fast fourier transform module; the fast Fourier transform module is used for converting the digital signal to generate a first conversion signal and sending the first conversion signal to a calculation module so as to enable the calculation module to carry out signal simulation; the fast Fourier inverse transformation module is used for carrying out inverse transformation on the signal simulated by the calculation module to generate a first inverse transformation signal and sending the first inverse transformation signal to the digital-to-analog conversion module; and the digital-to-analog conversion module is used for converting the first inverse transformation signal into an output signal and outputting the output signal.
Preferably, the simulation cassette further comprises: a display module; the display module is connected with the data transmission module; the display module is used for receiving a selection instruction of actual measurement parameters or standard parameters of the covered wire to be tested, setting length parameters and signal frequency parameters of the covered wire to be tested, and sending the selection instruction and the set parameters to the calculation module through the data transmission module.
Preferably, the data transmission module is an ethernet module, and the portable covered wire simulation box is connected with the control terminal through the ethernet module; the control terminal is used for receiving a selection instruction of an actual measurement parameter or a standard parameter of the covered wire to be tested, setting a length parameter and a signal frequency parameter of the covered wire to be tested, and sending the selection instruction and the set parameters to the calculation module of the portable covered wire simulation box through a network.
Preferably, the calculation module comprises: the receiving subunit is configured to receive the selection instruction and the set parameter sent by the display module, and the first transform signal sent by the fast fourier transform module; the acquisition subunit is configured to acquire, from the parameter storage module, an actual measurement parameter or a standard parameter corresponding to the covered wire to be detected, which is indicated by the selection instruction; wherein the measured parameters include: resistance, inductance, electric capacity, conductance parameter, the standard parameter includes: the resistance value of direct current, the inductance value of direct current, the conductance value of direct current, the resistance parameter that changes with frequency in the skin effect, the inductance value of alternating current, alternating current conductance value, critical frequency, damping constant; the parameter processing unit is used for directly calling a first processing model to calculate a line transmission function of the covered wire to be measured according to the actual measurement parameters when the acquired actual measurement parameters are the actual measurement parameters; when the obtained standard parameters are the standard parameters, calling a second processing model to process the standard parameters to obtain corresponding resistance, inductance, capacitance and conductance parameters, and calculating the resistance, inductance, capacitance and conductance parameters according to the first processing model to obtain a line transmission function of the covered wire to be detected; the calculation unit is used for simulating a first conversion signal sent by the fast Fourier transform module according to the line transmission function calculated by the parameter processing unit, the length parameter of the covered wire to be detected and the signal frequency parameter to generate an intermediate process signal; and the transmitting subunit is used for transmitting the intermediate process signal to the inverse fast Fourier transform module.
Preferably, the calculation module further comprises: the signal sending subunit is configured to send the first transform signal sent by the fast fourier transform module and the intermediate process signal generated by the calculating unit to the display module for display; the digital-to-analog conversion module is used for converting the first inverse conversion signal generated by the inverse fast Fourier transform module into an output signal and sending the output signal to the control module for display.
Compared with the prior art, the embodiment of the invention has the following advantages:
according to the portable covered wire simulation box provided by the embodiment of the invention, all modules for carrying out covered wire transmission performance simulation are integrated into one simulation box, so that the portable covered wire simulation box is convenient to carry, and can be directly applied to a covered wire erection site due to the portability, and the problem of poor flexibility in the existing covered wire transmission performance simulation scheme in a laboratory can be solved. In addition, the portable covered wire simulation box provided by the embodiment of the invention carries out simulation on the transmission performance of the covered wire through hardware equipment, and does not rely on the experience of field setting personnel, so that the portable covered wire simulation box has higher reliability compared with the existing scheme of carrying out transmission performance evaluation by the experience of the field setting personnel. Moreover, in the portable covered wire simulation box provided by the embodiment of the invention, the parameter storage module stores the actual measurement parameters of the covered wire of each model and the standard parameters corresponding to the covered wire of each model, and because two sets of parameters are set, in a specific application process, a user can respectively select the actual measurement parameters and the standard parameters to perform one-time simulation on the transmission performance of the covered wire, and the transmission performance of the covered wire is comprehensively evaluated according to the results of two-time simulation.
Drawings
Fig. 1 is a schematic structural diagram of a portable covered wire simulation box according to a first embodiment of the invention;
FIG. 2 is a schematic structural diagram of a portable covered wire simulation box according to a second embodiment of the invention;
fig. 3 is a schematic view of the portable covered wire simulation box according to the second embodiment, which is connected to another device when simulation is performed.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example one
Referring to fig. 1, a schematic structural diagram of a portable covered wire simulation box according to a first embodiment of the invention is shown.
The portable covered wire simulation box in the embodiment of the invention can be applied to a covered wire erection site. The portable covered wire simulation box includes: a calculation module 102, a parameter storage module 104, and a data transmission module 106.
The data transmission module 106 is connected to the calculation module 102 and the parameter storage module 104 respectively; the parameter storage module is used for storing the measured parameters of the covered wires of various types and the standard parameters corresponding to the covered wires of various types; the calculation module 102 is configured to receive a selection instruction of an actual measurement parameter or a standard parameter of the covered wire to be measured, which is transmitted by the data transmission module, and receive a set length parameter and a set signal frequency parameter of the covered wire to be measured; and the measured parameter or the standard parameter corresponding to the covered wire to be tested, which is indicated by the instruction, is obtained and selected from the parameter storage module 104, and signal simulation is performed on the signal sent by the sending-end remote transmission device according to the parameter obtained from the calculation module.
The measured parameters or the standard parameters corresponding to the covered wire are parameters which can be used for carrying out simulation on the transmission performance of the covered wire. When the transmission performance of the covered wire is simulated, the length of the covered wire and the signal frequency range are input into the calculation module of the portable covered wire simulation box, and the calculation module obtains the actual measurement parameters or the standard parameters corresponding to the covered wire, so that the transmission performance of the covered wire can be simulated.
The measured parameters corresponding to the covered wire may be the measured resistance R, the inductance L, the capacitance C, and the conductance G of the covered wire per kilometer of length. The standard parameter corresponding to the covered wire can be the covered wire roc、ac、l0、l∞、fm、b、g0、gc、c∞And (4) parameters. Wherein r isocIs the direct current resistance per kilometer of the coated wire, acTo characterize the parameters of resistance variation with frequency in the skin effect, l0Is the direct current inductance per kilometer of the covered wire∞The inductance value f is the inductance value when passing high-frequency alternating current for every kilometer of covered wiremIs the critical frequency, b is the parameter of the inductance value in the skin effect varying with the frequency, g0Is the direct current conductance per kilometer of the covered wire, gcAttenuation constant of conductance value per kilometer of covered wire as a function of frequency, c∞The conductance value of each kilometer of the covered wire when passing through high-frequency alternating current.
The data transmission module 106 may be a data line or an ethernet module.
According to the portable covered wire simulation box provided by the embodiment of the invention, all modules for carrying out covered wire transmission performance simulation are integrated into one simulation box, so that the portable covered wire simulation box is convenient to carry, and can be directly applied to a covered wire erection site due to the portability, and the problem of poor flexibility in the existing covered wire transmission performance simulation scheme in a laboratory can be solved. In addition, the portable covered wire simulation box provided by the embodiment of the invention carries out simulation on the transmission performance of the covered wire through hardware equipment, and does not rely on the experience of field setting personnel, so that the portable covered wire simulation box has higher reliability compared with the existing scheme of carrying out transmission performance evaluation by the experience of the field setting personnel. Moreover, in the portable covered wire simulation box provided by the embodiment of the invention, the parameter storage module stores the actual measurement parameters of the covered wire of each model and the standard parameters corresponding to the covered wire of each model, and because two sets of parameters are set, in a specific application process, a user can respectively select the actual measurement parameters and the standard parameters to perform one-time simulation on the transmission performance of the covered wire, and the transmission performance of the covered wire is comprehensively evaluated according to the results of two-time simulation.
Example two
Referring to fig. 2, a schematic structural diagram of a portable covered wire simulation box according to a second embodiment of the present invention is shown.
The portable covered wire simulation box 20 of the embodiment of the invention is applied to a covered wire erection site. As shown in fig. 3, a covered wire first interface 201 and a covered wire second interface 202 are arranged on the outer surface of the covered wire simulation box body. When the transmission performance test of the covered wire is performed, the covered wire first interface 201 is connected to the transmitting-end remote transmission device 30 through the covered wire, the covered wire second interface 202 is connected to the receiving-end remote transmission device 40 through the covered wire, and a control terminal 50 may be further configured to be in network connection with the portable covered wire simulation box 20 through an ethernet interface 203 connected to the ethernet module. The portable covered wire simulation box 20 and the control terminal 50 constitute a portable covered wire simulation device.
As shown in fig. 2, the portable covered wire simulation box 20 of the embodiment of the present invention includes: a calculation module 204, a parameter storage module 205, a data transmission module 206, an analog-to-digital sampling module 207, a fast fourier transform module 208, an inverse fast fourier transform module 209, a digital-to-analog conversion module 210, and a display module 211.
The data transmission module 206 is respectively connected to the calculation module 204 and the parameter storage module 205, the covered wire first interface 201 is connected to the analog-to-digital sampling module 207, and the covered wire second interface 202 is connected to the digital-to-analog conversion module 210. The fast fourier transform module 208 is respectively connected to the analog-to-digital sampling module 207 and the calculation module 204; the fast fourier transform module 209 is respectively connected to the calculation module 204 and the digital-to-analog conversion module 210; the display module 211 is connected to the data transmission module 206.
The parameter storage module 205 is configured to store measured parameters of covered wires of each model and standard parameters corresponding to the covered wires of each model; the calculating module 204 is configured to receive a selection instruction of an actual measurement parameter or a standard parameter of the covered wire to be measured, which is transmitted by the data transmission module, obtain and select the actual measurement parameter or the standard parameter corresponding to the covered wire to be measured, which is indicated by the selection instruction, from the parameter storage module 205, and perform signal simulation on a signal sent by the sending-end remote transmission device according to the parameter obtained from the calculating module 204.
The analog-to-digital sampling module 207 is configured to convert a signal sent by the sending-end remote transmission device into a digital signal, and send the digital signal to the fast fourier transform module 208; the fast fourier transform module 208 is configured to convert the digital signal to generate a first converted signal, and send the first converted signal to the calculation module 204, so that the calculation module 204 performs signal simulation; the fast fourier inverse transformation module 209 is configured to perform inverse transformation on the signal simulated by the calculation module to generate a first inverse transformation signal, and send the first inverse transformation signal to the digital-to-analog conversion module 210; the digital-to-analog conversion module 210 is configured to convert the first inverse transform signal into an output signal, and output the output signal into the converted output signal. The output signal can be output to a control terminal, a display module or a receiving end remote transmission device for displaying.
The display module 211 is configured to receive a selection instruction of an actual measurement parameter or a standard parameter of the covered wire to be tested, set a length parameter and a signal frequency parameter of the covered wire to be tested, and send the selection instruction and the set parameter to the calculation module 204 through the data transmission module 206.
Specifically, the calculation module 204 includes: receiving subunit, obtaining subunit, parameter processing unit, calculating unit, sending subunit and signal sending subunit, specifically:
the receiving subunit is configured to receive a selection instruction and a set parameter sent by the display module 211, and a first transform signal sent by the fast fourier transform module;
an obtaining subunit, configured to obtain and select, from the parameter storage module 205, an actual measurement parameter or a standard parameter corresponding to the covered wire to be tested, where the actual measurement parameter or the standard parameter is indicated by the instruction;
wherein, the measured parameters include: resistance, inductance, electric capacity, conductance parameter, standard parameter includes: the resistance value of direct current, the inductance value of direct current, the conductance value of direct current, the resistance parameter that changes with frequency in the skin effect, the inductance value of alternating current, alternating current conductance value, critical frequency, damping constant;
the parameter processing unit is used for directly calling the first processing model to calculate the line transmission function of the covered wire to be measured according to the actual measurement parameters when the acquired actual measurement parameters are the actual measurement parameters; when the obtained standard parameters are the standard parameters, calling a second processing model to process the standard parameters to obtain corresponding resistance, inductance, capacitance and conductance parameters, and calculating the resistance, inductance, capacitance and conductance parameters according to the first processing model to obtain a line transmission function of the covered wire to be measured;
the calculation unit is used for simulating a first conversion signal sent by the fast Fourier transform module according to the line transmission function calculated by the parameter processing unit, the length parameter of the covered wire to be detected and the signal frequency parameter to generate an intermediate process signal;
and the transmitting subunit is used for transmitting the intermediate process signal to the inverse fast Fourier transform module.
And the signal sending subunit is configured to send the first transform signal sent by the fast fourier transform module 208 and the intermediate process signal generated by the calculating unit to the display module 211 for display.
It should be noted that, in the specific implementation process, the display module may not be disposed in the portable covered wire simulation box, but the simulation box and the control terminal may be connected through the ethernet module network. The control terminal is used for receiving a selection instruction of an actual measurement parameter or a standard parameter of the covered wire to be measured, setting a length parameter and a signal frequency parameter of the covered wire to be measured, sending the selection instruction and the set parameter to the calculation module of the portable covered wire simulation box through the network, and displaying a series of simulation results of the portable covered wire simulation box to a user.
When the portable covered wire simulation box works, the portable covered wire simulation box is connected with the transmitting end remote transmission equipment through the covered wire. The control terminal starts to work like a computer, and the specific work comprises the following steps: and receiving the setting of a user on the test parameters, the starting and ending of the covered wire simulation process and the real-time monitoring in the simulation. Wherein, the setting of test parameter includes: selecting parameters of a covered wire to be simulated, setting a signal frequency range and setting the length of the covered wire to be simulated.
The parameters of the covered wire to be simulated are calculated and prestored in a parameter prestoring module of the covered wire simulation box, and if the actual measurement parameters of the covered wire to be simulated are prestored in the parameter prestoring module, the actual measurement parameters are selected for calculation; and if no corresponding actual measurement parameter exists, selecting and using the standard covered wire parameter for calculation. It should be noted that, in the specific implementation process, the user may also select whether to use the measured parameters or the standard parameters to perform the simulation test on the transmission performance of the covered wire according to the actual requirements.
The remote transmission equipment of the transmitting end sends out a signal SinputFirstly, the signal is converted into a digital signal S through an analog-digital sampling module1The fast Fourier transform module transforms the digital signal to S2Then, S is2And sending the signals to a calculation module, and calculating the transmission function and the intermediate state signal of the covered wire to be simulated by the calculation module.
Specifically, the calculation module may calculate the transfer function based on the RLCG model and the ABCD model theory, and the calculation method is as follows:
firstly, a calculation module judges whether corresponding actual measurement parameters are stored in a parameter storage module according to the covered wire parameters selected by a user through a control terminal or a display module, and if the corresponding actual measurement parameters of the actual measurement resistance R, the inductance L, the capacitance C and the conductance G exist, the actual measurement parameters are used for calculating a transmission function based on an ABCD model; if there is no corresponding measured parameter, firstly according to the prestored roc、ac、l0、l∞、fm、b、g0、gc、c∞And parameters, namely determining the resistance R, the inductance L, the capacitance C and the conductance G of each kilometer of the covered wire based on an RLCG model.
The RLCG model is shown below:
wherein R (f), L (f), C (f), G (f) are respectively a resistance function, an inductance function, a capacitance function and a conductance function of each kilometer of the covered wire which changes along with the signal frequency, f is the signal frequency, r (f)ocIs the direct current resistance per kilometer of the coated wire, acTo characterize the parameters of resistance variation with frequency in the skin effect, l0Is the direct current inductance per kilometer of the covered wire∞The inductance value f is the inductance value when passing high-frequency alternating current for every kilometer of covered wiremIs the critical frequency, b is the parameter of the inductance value in the skin effect varying with the frequency, g0Is the direct current conductance per kilometer of the covered wire, gcIs coated for every kilometerAttenuation constant of the line conductance value as a function of frequency, c∞The conductance value of each kilometer of the covered wire when passing through high-frequency alternating current.
And (4) calculating the RLCG model to calculate R, L, C, G corresponding to the covered wire to be tested.
Then, using the calculated R, L, C, G, the transmission parameters are calculated based on the ABCD model and the transmission function | h (f) | of the covered wire line to be measured is calculated by the following calculation formulas (2) and (3):
where, ω is angular frequency, γ is transmission parameter, α, β are real and imaginary parts of γ, Z, respectively0Is the characteristic impedance. Line termination load impedance of ZLWhen Z is0＝ZLWhen the time is matched, the transfer function calculation formula of the line is as follows:
|H(f)|＝e-d×α(f) (3)
where d is the length of the covered wire to be modeled and α (f) is a function of the real part of γ as a function of f.
So far, the transmission function | H (f) | of the covered wire line to be tested is calculated.
The calculation module is based on S2And | H (f) | calculates the intermediate state signal S3，S3＝|H(f)|·S2Then through the inverse Fourier transform module pair S3Performing fast Fourier transform to obtain S4Pair of digital-to-analog conversion modules S4Performing digital-to-analog conversion to obtain an output signal SoutputAnd the simulation result is output to the receiving end remote transmission equipment and displayed on the control terminal or the display module so as to provide a user for carrying out theoretical analysis on the simulation result of the covered wire.
The portable covered wire simulation box in the embodiment of the invention combines the covered wire transmission theory with the covered wire actual measurement parameters, prestores the standard covered wire parameters and the actual measurement covered wire parameters into the parameter storage module, and calculates the transmission function of the covered wire of the type and the length to be measured according to the RLCG model and the ABCD model by using the covered wire parameters; according to the input signal of the input end remote transmission equipment, the device generates an output signal by using a transmission function and sends the output signal to the receiving end remote transmission equipment, and the signal effect is visually verified in the remote transmission of the receiving end; in addition, the transmitting end signal, the transmission function and the receiving end signal can be displayed on the portable display module or the control terminal, so that a user can perform theoretical analysis.
According to the portable covered wire simulation box provided by the embodiment of the invention, all modules for carrying out covered wire transmission performance simulation are integrated into one simulation box, so that the portable covered wire simulation box is convenient to carry, and can be directly applied to a covered wire erection site due to the portability, and the problem of poor flexibility in the existing covered wire transmission performance simulation scheme in a laboratory can be solved. In addition, the portable covered wire simulation box provided by the embodiment of the invention carries out simulation on the transmission performance of the covered wire through hardware equipment, and does not rely on the experience of field setting personnel, so that the portable covered wire simulation box has higher reliability compared with the existing scheme of carrying out transmission performance evaluation by the experience of the field setting personnel. Moreover, in the portable covered wire simulation box provided by the embodiment of the invention, the parameter storage module stores the actual measurement parameters of the covered wire of each model and the standard parameters corresponding to the covered wire of each model, and because two sets of parameters are set, in a specific application process, a user can respectively select the actual measurement parameters and the standard parameters to perform one-time simulation on the transmission performance of the covered wire, and the transmission performance of the covered wire is comprehensively evaluated according to the results of two-time simulation.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The portable covered wire simulation box provided by the invention is described in detail, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components in a system start-up scheme according to embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (5)
1. A portable covered wire simulation box, which is applied to a covered wire erection site, comprising: the device comprises a calculation module, a parameter storage module, a data transmission module, a display module, an inverse fast Fourier transform module and a digital-to-analog conversion module; a covered wire first interface and a covered wire second interface are arranged on the outer surface of the covered wire simulation box body;
the data transmission module is an Ethernet module, and the portable covered wire simulation box is connected with the control terminal through the Ethernet module;
the covered wire first interface is connected with the transmitting end remote transmission equipment through the covered wire, and the covered wire second interface is connected with the receiving end remote transmission equipment through the covered wire;
the data transmission module is respectively connected with the calculation module and the parameter storage module;
the parameter storage module is used for storing the measured parameters of the covered wires of various types and the standard parameters corresponding to the covered wires of various types;
the calculation module is used for receiving a selection instruction of an actual measurement parameter or a standard parameter of a covered wire to be detected, which is transmitted by the data transmission module, acquiring the actual measurement parameter or the standard parameter corresponding to the covered wire to be detected, which is indicated by the selection instruction, from the parameter storage module, and performing signal simulation on a signal sent by the sending-end remote transmission equipment according to the parameter acquired from the calculation module;
the fast Fourier inverse transformation module is used for carrying out inverse transformation on the signal simulated by the calculation module to generate a first inverse transformation signal and sending the first inverse transformation signal to the digital-to-analog conversion module;
the digital-to-analog conversion module is configured to convert the first inverse transformation signal into an output signal, and output the output signal to the control terminal, the display module, or the receiving-end remote transmission device, so as to display the output signal;
the display module is connected with the data transmission module; the display module is used for receiving a selection instruction of an actual measurement parameter or a standard parameter of a covered wire to be tested, setting a length parameter and a signal frequency parameter of the covered wire to be tested, and sending the selection instruction and the set parameter to the calculation module through the data transmission module;
the transmission performance of the covered wire is comprehensively evaluated according to the two simulation results.
2. The portable covered wire simulation box according to claim 1, further comprising: the device comprises an analog-digital sampling module and a fast Fourier transform module;
the covered wire first interface is connected with the analog-digital sampling module, and the covered wire second interface is connected with the digital-analog conversion module;
the fast Fourier transform module is respectively connected with the analog-digital sampling module and the calculation module;
the fast Fourier inverse transformation module is respectively connected with the calculation module and the digital-to-analog conversion module.
3. The portable covered wire simulation box according to claim 2, wherein the analog-to-digital sampling module is configured to convert a signal sent by a sending-end remote transmission device into a digital signal, and send the digital signal to the fast fourier transform module;
the fast Fourier transform module is used for converting the digital signal, generating a first conversion signal and sending the first conversion signal to the calculation module so that the calculation module can carry out signal simulation.
4. The portable covered wire simulation box according to any one of claims 1 to 3, wherein the control terminal is configured to receive a selection instruction of a measured parameter or a standard parameter of a covered wire to be measured and settings of a length parameter and a signal frequency parameter of the covered wire to be measured, and to transmit the selection instruction and the set parameters to the calculation module of the portable covered wire simulation box through a network.
5. The portable covered wire simulation box according to claim 2, wherein the calculation module comprises:
the receiving subunit is configured to receive the selection instruction and the set parameter sent by the display module, and the first transform signal sent by the fast fourier transform module;
the acquisition subunit is configured to acquire, from the parameter storage module, an actual measurement parameter or a standard parameter corresponding to the covered wire to be detected, which is indicated by the selection instruction; wherein the measured parameters include: resistance, inductance, electric capacity, conductance parameter, the standard parameter includes: the resistance value of direct current, the inductance value of direct current, the conductance value of direct current, the resistance parameter that changes with frequency in the skin effect, the inductance value of alternating current, alternating current conductance value, critical frequency, damping constant;
the parameter processing unit is used for directly calling a first processing model to calculate a line transmission function of the covered wire to be measured according to the actual measurement parameters when the acquired actual measurement parameters are the actual measurement parameters; when the obtained standard parameters are the standard parameters, calling a second processing model to process the standard parameters to obtain corresponding resistance, inductance, capacitance and conductance parameters, and calculating the resistance, inductance, capacitance and conductance parameters according to the first processing model to obtain a line transmission function of the covered wire to be detected;
the calculation unit is used for simulating a first conversion signal sent by the fast Fourier transform module according to the line transmission function calculated by the parameter processing unit, the length parameter of the covered wire to be detected and the signal frequency parameter to generate an intermediate process signal;
and the transmitting subunit is used for transmitting the intermediate process signal to the inverse fast Fourier transform module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510604535.4A CN106559104B (en) | 2015-09-21 | 2015-09-21 | Portable covered wire simulation box |
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