CN201571053U - Automatic performance measuring device of power wire carrier communication channel - Google Patents
Automatic performance measuring device of power wire carrier communication channel Download PDFInfo
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- CN201571053U CN201571053U CN2009202571007U CN200920257100U CN201571053U CN 201571053 U CN201571053 U CN 201571053U CN 2009202571007 U CN2009202571007 U CN 2009202571007U CN 200920257100 U CN200920257100 U CN 200920257100U CN 201571053 U CN201571053 U CN 201571053U
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Abstract
The utility model relates to an automatic performance measuring device of a power wire carrier communication channel, comprising a central processing unit, an analog-to-digital conversion module communicated with the central processing unit, a digital-to-analog conversion module, a synchronous dynamic random access memory, a digital signal processor, an RS232 serial interface module and an analog front end module, wherein the synchronous dynamic random access memory is communicated with the RS232 serial interface module; and the analog front end module is provided with an input and output interface for connecting with coupling equipment, the signal output end of the analog front end module is connected with an input port of the analog-to-digital conversion module, and the signal input end is connected with a signal output port of the digital-to-analog conversion module. The device realizes high-integration automatic performance measurement of the power wire carrier communication channel and is convenient for the measurement of different performances of the power wire carrier communication channel; and the performance automatic measuring device automatically carries out the transmission of measuring signals and the analysis and output of measuring results without manual intervention and has short measuring time, accurate result and no influence on other kinds of equipment in a power wire network.
Description
Technical field
The utility model relates to a kind of power line carrier communication channel performance self-operated measuring unit, be widely used in the power line is in the carrier communication system of transmission medium, the power line carrier communication channel is measured automatically, and provided the accurate measurement result of channel with text, graph mode.
Background technology
Power line data communication technology (PLC), be in a kind of utilization, low-voltage network is as communication media, realize the communication technology of Integrated Services Transmission such as data, speech, image, not only can be used as the effective means that solves broadband access " last 1km ", and can provide the high speed data transfer platform for electric power load monitoring and control, remote meter reading, adapted electric automation, dsm, Intranet, wired home and digitization community.According to national Specification, with the use frequency range of 3KHz～500KHz frequency band range as electric line carrier communication.
The original intention of power line design is that the transmission frequency is a 50Hz power frequency electric power signal, when being expanded to voice or data, its function will face complex electromagnetic environments, abominable performances such as what presented is a kind of strong noise, overdamp, load variations is violent, impedance variation is big, frequency response unevenness, therefore to realize reliable power line transfer of data, must be at the power line channel The Characteristic Study.
The power line network channel model disturbs and noise foundation with adding based on transfer function as shown in Figure 1.Usually use multipath mode method, the signal attenuation on the power line increases the trend that increase is arranged with frequency, and frequency high-transmission line effect is obvious more more, the possibility that resonance takes place is big more, causes that decay can increase sharply under some frequency.Simultaneously, the multipath effect on the power line is similar to radio spatial channels, and difference is that the route of the former multipath transmission is limited, therefore, can think that power line is the multipath channel of a frequency selectivity.When setting up model, with reference to Rayleigh channel, and suitable abbreviation, can obtain transfer function:
I is a multipath component number in the formula, η
0And η
1Be the Line Attenuation coefficient; ε is a decay factor; v
pBe propagation velocity; l
iBe the length that the i bar divides the footpath.
Except the distorted signals that is caused because of Line Attenuation and multiplexing, noise is the most critical factor that influences the reliable communication of power line data.Different with other channels is, power line channel has comparatively complicated noise circumstance, its complicated network structure, and the load of connection is numerous and often change, and the noise that therefore acts on it can not simply be summed up as additive white Gaussian noise (AWGN).
The power line main noise has: 1. coloured background noise 2. narrow-band noise 3. with the asynchronous 4. synchronous recurrent pulses noise of recurrent pulses noise of power frequency with power frequency.The medium voltage power line average noise power-60～-70dBm/Hz about.Wherein, by the coloured Background Noise Power that is formed by stacking of multiple low power noise generally-60～-70dBm/Hz between, can be lower than-80dBm/Hz in some frequency ranges, its integral body weakens with increase frequency, and it is slower that power spectrum changes, and is generally minute even hour magnitude; The main narrow-band noise that is caused by other wireless communication signals such as broadcasting station in the communication bandwidth on average takies the bandwidth of 2k～4kHz, and power is higher, exceeds about 30～50dBm/Hz than background noise, and such disturbs general stable existence when long; What communication efficiency was had the greatest impact is impulsive noise, this noise like produces at random, duration is very short, be generally tens or the hundreds of millisecond, overwhelming majority power is higher than background noise 10～30dBm/Hz, when impulse noise takes place, serious sudden error code may appear in the transfer of data in the noise frequency range.
In China because the power line circuit distributes and loading condition is more complicated, disturb stronger relatively, the physical layer environment more complicated that the power line group-net communication is faced with badly.When therefore on the power line of reality, carrying out carrier communication, need specifically measure communication channel, usually the method for measurement that adopts as shown in Figure 2 at present: the swept-frequency signal that signal generator sends enters power line by coupling circuit, directly enters spectrum analyzer at the other end of measuring by coupler.
When on the power line of reality, carrying out the carrier communication application, need specifically measure communication channel, but because the voltage Power Line Carrier Channel complicated network structure, the noise circumstance complexity, use the shortcoming of traditional measurement method very obvious: when circuit network structure more complicated, the workload of measuring needs a large amount of instrument and equipments, and Measuring Time needs the later stage manually to carry out a large amount of processing and analysis than long and measurement result.Can't measure the application that has limited the power line data communication technology to a certain extent quickly and accurately to the power line channel performance.
Summary of the invention
The purpose of this utility model is: at above the deficiencies in the prior art, a kind of power line carrier communication channel performance self-operated measuring unit is provided, it uses instruments such as DSP analog signal generator and spectrum analyzer, transmit leg sends signal on the voltage Power Line Carrier Channel by Coupling device, the recipient is by Coupling device received signal on the carrier channel, analyze accordingly and with analysis result with figure, the output of text pattern.
In order to reach the above object: the power line carrier communication channel performance self-operated measuring unit that the utility model provides, its composition comprises: central processing unit, analog-to-digital converting module with this central processing unit communication, numeral, Synchronous Dynamic Random Access Memory, digital signal processor, the RS232 serial interface module, described Synchronous Dynamic Random Access Memory is connected with the communication of RS232 serial interface module, it also includes an analog front-end module, this analog front-end module has the input/output interface that is used for the Coupling device connection, utilize Coupling device with signal loading on power line, its signal output part is connected with the input port of analog-to-digital converting module, and its signal input part is connected with the signal output port of numeral.
Finish surveying work jointly by computer (PC), power line carrier communication channel performance self-operated measuring unit, coupler and corresponding software, at first play not-go-end coupler is installed respectively at circuit to be measured, and connection coupler, power line carrier communication channel performance self-operated measuring unit and computer (PC), go up digital signal processor (DSP) application software of installing by computer (PC) and carry out the measurement parameter setting, content is set comprises: the 1. selection setting of master and slave measurement mechanism by the RS232 serial interface module; 2. the measuring frequency scope is provided with; 3. measure contents of a project setting; 4. the measurement result outgoing route is provided with.
Then begin automatic surveying work by computer (PC) control power line carrier communication channel performance self-operated measuring unit, the action of the DSP analog signal generator in the main measurement mechanism sends standard measuring signal, pass through CPU, numeral (D/A) is to analog front-end module, analog front-end module is amplified standard measuring signal, send on the circuit through coupler, AFE (analog front end) from measurement mechanism detects the test signal that main measurement mechanism sends by coupler, this moment, this signal just had the information of channel performance, signal is through analog digital conversion (A/D) and CPU, arrive DSP, DSP carries out Treatment Analysis to this signal, and send the result to PC by the RS232 serial line interface, PC by application software with the form output of measurement result with figure and text.
The utlity model has following advantage:
(1) the power line carrier communication channel performance of having realized high integration is measured automatically, can carry out the diversity energy measurement to voltage Power Line Carrier Channel easily.
(2) analysis of the transmission of measuring-signal, measurement result output is automatically carried out, and need not manual intervention, measures weak point consuming time, the result is accurate.
(3) meet the standard of country, the miscellaneous equipment in the power line network is not had influence about carrier communication.
(4) adopt 220 volts of AC-powered, power taking, easy to use.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1: power line channel model schematic diagram.
Fig. 2: existing power line channel method of measurement schematic diagram.
Fig. 3: the utility model power line carrier communication channel performance self-operated measuring unit structured flowchart.
Fig. 4: power line carrier communication channel performance method for automatic measurement schematic diagram.
Fig. 5: software operation workflow schematic diagram.
Fig. 6: this device is to carrier communication interchannel noise mean value spectrum analysis figure as a result.
Fig. 7: the figure as a result that this device is analyzed carrier communication channel signal attenuation spectrum.
Embodiment
The power line carrier communication channel performance self-operated measuring unit of present embodiment, as shown in Figure 3, it is characterized in that central processing unit (CPU), analog-to-digital converting module (A/D) with this central processing unit communication, numeral (D/A), Synchronous Dynamic Random Access Memory (SDRAM), digital signal processor (DSP), serial interface module (RS232), Synchronous Dynamic Random Access Memory SDRAM is connected with the communication of RS232 serial interface module, it also includes an analog front-end module, this analog front-end module has the input/output interface that is used for the Coupling device connection, utilize Coupling device with signal loading on power line, its signal output part is connected with the input port of analog-to-digital converting module (A/D), and its signal input part is connected with the signal output port of numeral (D/A).In this device, analog front-end module is a bidirectional filtering, power amplification circuit, also can use two independently unidirectional filtering, power amplification circuit to substitute.
During the work of power line carrier communication channel performance self-operated measuring unit, set the master respectively at two measurement points in advance by the Survey Software that is installed on the PC, from device, the action of the digital signal processor in the main measurement mechanism (DSP) analog signal generator sends standard measuring signal, by central processing unit (CPU), numeral (D/A) is to analog front-end module, analog front-end module is amplified standard measuring signal, send on the circuit through coupler, AFE (analog front end) from measurement mechanism detects the test signal that main measurement mechanism sends by coupler, this moment, this signal just had the information of channel performance, signal is through simulation, data-converting block (A/D) and central processing unit (CPU), arrive digital signal processor (DSP), DSP carries out Treatment Analysis to this signal, and sends the result to PC by the RS232 serial interface module.
Fig. 5 is the schematic flow sheet of whole software running, behind the electrifying startup, at first setting power line carrier communication channel performance self-operated measuring unit by the Survey Software among the PC is main device or from device, main device is provided with the measurement function parameter of DSP by the Survey Software among the PC, comprise noise analysis parameter, channel Analysis signal-to-noise ratio (SNR) parameter, standard measuring signal parameter etc., the dsp software of main device is pressed parameter request control DSP and is sent standard measuring signal.Also earlier corresponding D SP measurement function parameter is set from device by the Survey Software the PC, the store path of setting measurement result on the PC hard disk again, during reception, receive the test signal that main device is sent from device, DSP functional measurement software module to signal contrast accordingly, processing such as spectrum analysis, result is transferred to digital signal processor operating system (DSP-OS), DSP-OS sends to PC with result by RS232, the PC Survey Software shows measurement result, and measurement result is pressed the specified path storage with the virtual oscilloscope form.
Fig. 6 is the present invention to carrier communication interchannel noise mean value spectrum analysis figure as a result, and transverse axis is a frequency among the figure, and unit K Hz, the longitudinal axis are the noise size, the DB of unit.Power line carrier communication channel performance self-operated measuring unit takes multiple measurements peak noise in the channel, and the spectrum analysis result who averages, show measurement result by the virtual oscilloscope function of PC software, the measurement result from figure can verify that the front mentions voltage Power Line Carrier Channel global noise level along with frequency increases and the characteristics of reduction.
The figure as a result that Fig. 7 analyzes carrier communication channel signal attenuation spectrum for the present invention, transverse axis is a frequency among the figure, unit K Hz, the longitudinal axis are the signal attenuation size, the DB of unit.Compare analysis from device by each frequency standard test signal that main device is sent, and finally show measurement result with the virtual oscilloscope form by PC, as can be seen from the figure the power line carrier communication fading channel has tangible frequency selectivity, the less frequency range of fading channel just is fit to carry out power line carrier communication, and this has also illustrated the importance of the channel performance measurement function that the present invention finished.
In addition to the implementation, the utility model can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation form, all drop on the protection range of the utility model requirement.
Claims (3)
1. power line carrier communication channel performance self-operated measuring unit, it is characterized in that forming and comprise: central processing unit, analog-to-digital converting module with this central processing unit communication, numeral, Synchronous Dynamic Random Access Memory, digital signal processor, the RS232 serial interface module, described Synchronous Dynamic Random Access Memory is connected with the communication of RS232 serial interface module, it also includes an analog front-end module, this analog front-end module has the input/output interface that is used for the Coupling device connection, its signal output part is connected with the input port of analog-to-digital converting module, and its signal input part is connected with the signal output port of numeral.
2. power line carrier communication channel performance self-operated measuring unit according to claim 1 is characterized in that described analog front-end module is a bidirectional filtering, power amplification circuit.
3. power line carrier communication channel performance self-operated measuring unit according to claim 1 is characterized in that analog front-end module is made of two independently unidirectional filtering, power amplification circuits.
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| CN2009202571007U CN201571053U (en) | 2009-10-28 | 2009-10-28 | Automatic performance measuring device of power wire carrier communication channel |
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| CN2009202571007U CN201571053U (en) | 2009-10-28 | 2009-10-28 | Automatic performance measuring device of power wire carrier communication channel |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185639A (en) * | 2011-04-27 | 2011-09-14 | 中国电力科学研究院 | Characteristic analyzer used for low-voltage power line carrier wave channel |
| CN106160879A (en) * | 2015-04-11 | 2016-11-23 | 宁远 | A kind of ground wire communication means and system |
| CN106443151A (en) * | 2016-06-30 | 2017-02-22 | 上海景格科技股份有限公司 | Line analyzer |
| CN106487421A (en) * | 2015-08-31 | 2017-03-08 | 上海东软载波微电子有限公司 | Power line carrier communication test system and its method of testing |
| CN108199929A (en) * | 2018-02-28 | 2018-06-22 | 上海市信息网络有限公司 | Measuring instrument, network intelligence instrument system and network intelligence test method |
| CN108964704A (en) * | 2018-07-24 | 2018-12-07 | 南方电网科学研究院有限责任公司 | A kind of broadband power line carrier communication Research on Channel method, apparatus and storage medium |
-
2009
- 2009-10-28 CN CN2009202571007U patent/CN201571053U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185639A (en) * | 2011-04-27 | 2011-09-14 | 中国电力科学研究院 | Characteristic analyzer used for low-voltage power line carrier wave channel |
| CN102185639B (en) * | 2011-04-27 | 2014-01-29 | 中国电力科学研究院 | Characteristic analyzer used for low-voltage power line carrier wave channel |
| CN106160879A (en) * | 2015-04-11 | 2016-11-23 | 宁远 | A kind of ground wire communication means and system |
| CN106160879B (en) * | 2015-04-11 | 2018-08-31 | 宁远 | A kind of ground wire communication means and system |
| CN106487421A (en) * | 2015-08-31 | 2017-03-08 | 上海东软载波微电子有限公司 | Power line carrier communication test system and its method of testing |
| CN106487421B (en) * | 2015-08-31 | 2019-05-31 | 上海东软载波微电子有限公司 | Power line carrier communication test macro and its test method |
| CN106443151A (en) * | 2016-06-30 | 2017-02-22 | 上海景格科技股份有限公司 | Line analyzer |
| CN108199929A (en) * | 2018-02-28 | 2018-06-22 | 上海市信息网络有限公司 | Measuring instrument, network intelligence instrument system and network intelligence test method |
| CN108964704A (en) * | 2018-07-24 | 2018-12-07 | 南方电网科学研究院有限责任公司 | A kind of broadband power line carrier communication Research on Channel method, apparatus and storage medium |
| CN108964704B (en) * | 2018-07-24 | 2022-04-29 | 南方电网科学研究院有限责任公司 | Broadband power line carrier communication channel research method, device and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: NANJING NARI CO., LTD. STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: NANJING NARI CO., LTD. Effective date: 20130320 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130320 Address after: Nanjing City, Jiangsu Province, 210003 South Shui Road No. 8 Patentee after: State Grid Electric Power Research Insititute Patentee after: Nanjing Nari Co., Ltd. Patentee after: State Grid Corporation of China Address before: Nanjing City, Jiangsu Province, 210003 South Shui Road No. 8 Patentee before: State Grid Electric Power Research Insititute Patentee before: Nanjing Nari Co., Ltd. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171121 Address after: 211106 Jiangning City, Nanjing Province, the integrity of the road No. 19, Co-patentee after: NARI Technology Development Co., Ltd. Patentee after: State Grid Electric Power Research Insititute Co-patentee after: State Grid Corporation of China Address before: Nanjing City, Jiangsu Province, 210003 South Shui Road No. 8 Co-patentee before: Nanjing Nari Co., Ltd. Patentee before: State Grid Electric Power Research Insititute Co-patentee before: State Grid Corporation of China |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100901 |