CN203563066U - Orthogonal signal based test system for power line carrier channel attenuation - Google Patents
Orthogonal signal based test system for power line carrier channel attenuation Download PDFInfo
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- CN203563066U CN203563066U CN201320666734.4U CN201320666734U CN203563066U CN 203563066 U CN203563066 U CN 203563066U CN 201320666734 U CN201320666734 U CN 201320666734U CN 203563066 U CN203563066 U CN 203563066U
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Abstract
The utility model relates to a test system in the field of electric power communication, particularly to an orthogonal signal based test system for power line carrier channel attenuation. The test system comprises a carrier signal transmitting end and a signal receiving end which are connected to a power line, wherein the signal transmitting end comprises an orthogonal signal output system, a transmitting coupling circuit, a data acquisition card and a controller which are connected sequentially to form a closed-loop structure; and the signal receiving end comprises a receiving coupling circuit, a data acquisition card and a controller which are connected sequentially. According to the utility model, Cos (cosine) and Sin (sine) signals in an orthogonal relationship are simultaneously transmitted on a narrowband output channel and a broadband output channel respectively. According to the test system provided by the utility model, the signals emitted by the power line carrier channel attenuation are tested, and the Cos and Sin signals in the orthogonal relationship are output simultaneously, so that noises and the signals which are same in frequency can be distinguished easily, and the influences of the noises on attenuation tests are avoided.
Description
Technical field
The utility model relates to the test macro in power communication field, is specifically related to a kind of voltage Power Line Carrier Channel attenuation test system based on orthogonal signalling.
Background technology
At present, in the method and apparatus of existing voltage Power Line Carrier Channel decay, if the in the situation that of larger at signal receiving end noise or measurement circuit grows, the signal receiving is almost submerged in noise, testing apparatus is difficult to noise to carry out separate with signal, noise can be mistakened as into signal sometimes and test, the decay of the voltage Power Line Carrier Channel that test is arrived like this will be inaccurate.
Existing method of testing has following deficiency:
1) be difficult to distinguish noise and signal.
2) can not test signal to noise ratio.
Utility model content
For the deficiencies in the prior art, the purpose of this utility model is to provide a kind of voltage Power Line Carrier Channel attenuation test system based on orthogonal signalling, cosine (Cos) and sinusoidal (Sin) signal that the utility model utilization has orthogonality relation transmit respectively on arrowband output channel and Broadband emission passage simultaneously, at output, just can obtain having the signal of orthogonality relation, separating with noise frequently and signaling zone, prevent the impact of noise on attenuation test easily.
The purpose of this utility model is to adopt following technical proposals to realize:
The utility model provides a kind of voltage Power Line Carrier Channel attenuation test system based on orthogonal signalling, and described system comprises the carrier signal transmitting terminal and the signal receiving end that are connected on power line; Its improvements are, described signal sending end comprise be in turn connected into closed-loop structure orthogonal signalling output system, send coupling circuit, data collecting card and controller; Described signal receiving end comprises the reception coupling circuit, data collecting card and the controller that connect successively.
Further, described orthogonal signalling output system comprises orthogonal signalling generation module;
Described orthogonal signalling generation module has two-way carrier channel, and the signal orthogonality relation each other of output, a wherein road carrier channel output cosine signal, another road carrier channel output sinusoidal signal; Two paths of signals exports power line to by the filter, signal amplifier, power amplifier and the coupler that connect successively in orthogonal signalling output system respectively.
Further, the controller of signal sending end sends instruction to orthogonal signalling output system, sends the orthogonal two-way carrier signal of single frequency; By sending coupling circuit, be coupled on power line; Described transmission coupling circuit is the signal coupling on power line, and utilizes data collecting card to gather the time-domain signal on power line, is finally transferred to controller, and described controller carries out Storage and Processing by the data of test, obtains the signal level U of carrier signal transmitting terminal
s;
The controller of signal sending end sends instruction to orthogonal signalling output system, sends the orthogonal two-way carrier signal of single frequency, by sending coupling circuit, is coupled on power line; The reception coupling circuit of signal receiving end is by the signal coupling on power line, and utilize data collecting card to gather the time-domain signal on power line, finally be transferred to controller, described controller carries out Storage and Processing by the data of test, obtains the signal level U of carrier signal receiving terminal
r.
Further, described transmission coupling circuit comprises piezo-resistance, safety electric capacity, discharge resistance, step-down transformer, transmission filter circuit and bidirectional diode;
Described piezo-resistance, step-down transformer and bidirectional diode parallel connection; 2 described safety electric capacity symmetries are connected between piezo-resistance and step-down transformer; The two ends of each safety electric capacity are all connected with discharge resistance; Described in 2 groups, sending filter circuit is connected between step-down transformer and bidirectional diode; The output of described bidirectional diode D1 is connected with signal receiving end; Described transmission filter circuit is comprised of the electric capacity of connecting and inductance;
Described data acquisition calorie requirement has sampling rate more than 10MS/s, and the power that bears of input port is more than 10dBm;
Described controller adopts PC or notebook computer.
Further, described reception coupling circuit comprises piezo-resistance, safety electric capacity, discharge resistance, step-down transformer, wave reception filtering circuit and automatic gain control unit;
Described piezo-resistance, step-down transformer and bidirectional diode parallel connection; 2 described safety electric capacity symmetries are connected between piezo-resistance and step-down transformer; The two ends of each safety electric capacity are all connected with discharge resistance; Described in 2 groups, wave reception filtering circuit is connected between step-down transformer and automatic gain control unit; The output of described automatic gain control unit is connected with signal sending end; Described wave reception filtering circuit is comprised of the capacitor of connecting and inductance, and is parallel with electric capacity at the two ends of described inductance; Described automatic gain control unit adopts AGC controller.
Compared with the prior art, the beneficial effects of the utility model are:
1) the method utilization has cosine (Cos) and the transmission simultaneously on two passages respectively of sinusoidal (Sin) signal of orthogonality relation, the utility model is decayed in the signal of launching in test voltage Power Line Carrier Channel, output simultaneously has cosine and the sinusoidal signal of orthogonality relation, this signal with orthogonality relation keeps the phase place of 90 ° in phase place always, this is just equivalent to mark to signal, so can easily noise and signaling zone be separated, prevent the impact of noise on attenuation test, so just can test more accurately decay.。
2) the utility model utilization has in the process of signal testing decay of orthogonality relation, can very accurately the noise of same frequency and signal be separated, and test out respectively the level value of noise and signal, thus utilize signal level to deduct noise level, and then obtain signal to noise ratio.
3) the utility model can test out signal strength signal intensity and noise intensity at the transmitting terminal of signal, thereby determines the signal to noise ratio of transmitting terminal, and receiving terminal tests out signal strength signal intensity and the noise intensity of receiving terminal again, thereby determines the signal to noise ratio of receiving terminal.。
Accompanying drawing explanation
Fig. 1 is the attenuation test system principle diagram that the utility model provides; Wherein: 1-orthogonal signalling output system; 2-sends coupling circuit; 3-receives coupling circuit; 4-data collecting card; 5-controller;
Fig. 2 is the signal sending end orthogonal signalling output system block diagram that the utility model provides;
Fig. 3 is sine and the cosine signal oscillogram of the orthogonal signalling generation module output that provides of the utility model;
Fig. 4 is the reception signal temporal evolution curve chart that the utility model provides;
Fig. 5 is the sending/receiving signal temporal evolution curve chart that the utility model provides;
Fig. 6 is the topology diagram of the transmission coupling circuit that provides of the utility model;
Fig. 7 is the topology diagram of the reception coupling circuit that provides of the utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
The attenuation test system principle diagram that the utility model provides as shown in Figure 1, comprises the carrier signal transmitting terminal and the signal receiving end that are connected on power line; Described signal sending end comprises the orthogonal signalling output system 1, transmission coupling circuit 2, data collecting card 4 and the controller 5 that are in turn connected into closed-loop structure; Described signal receiving end comprises the reception coupling circuit 3, data collecting card 4 and the controller 5 that connect successively.
Orthogonal signalling output system comprises orthogonal signalling generation module; Described orthogonal signalling generation module has two-way carrier channel, and the signal orthogonality relation each other of output, a wherein road carrier channel output cosine signal, another road carrier channel output sinusoidal signal; Two paths of signals exports power line to by the filter, signal amplifier, power amplifier and the coupler that connect successively in orthogonal signalling output system respectively.
Send coupling circuit and comprise piezo-resistance V21, safety electric capacity, discharge resistance, step-down transformer T, filter circuit and bidirectional diode D1; Piezo-resistance V21, step-down transformer T and bidirectional diode D1 parallel connection; 2 described safety capacitor C 21 and C22 symmetry are connected between piezo-resistance V21 and step-down transformer T; The two ends of safety capacitor C 21 are connected with discharge resistance R21; The two ends of safety capacitor C 21 are connected with discharge resistance R22; Described in 2 groups, filter circuit C41-L1 and C42-L2 are connected between step-down transformer and bidirectional diode D1; The output of described bidirectional diode D1 is connected with signal receiving end; At the two ends of described bidirectional diode D1, be parallel with protective resistance R4, R4 ground connection.
Described filter circuit C41-L1 is comprised of the capacitor C 41 of connecting and inductance L 1; Described filter circuit C42-L2 is comprised of the capacitor C 42 of connecting and inductance L 2; Its topology diagram as shown in Figure 6.
Wherein piezo-resistance V21, for the protection of circuit, prevents thunderbolt and the infringement of high-voltage pulse to circuit; Safety electric capacity is used for couples high frequency signals, and by the power frequency electricity of 50Hz and test macro isolation; Discharge resistance, for the in the situation that of power-off, the electric energy of the total storage of safety electric capacity being discharged, prevents from by the electric charge electricity in electric capacity, being arrived when tester from encountering calibrating terminal by mistake; Step-down transformer T is the impedance relationship for regulating input and output, makes the output of signal energy maximum power; Bidirectional diode D1, for clamp voltage, prevents that too high voltage from burning out tester.
Receive coupling circuit and comprise piezo-resistance, safety electric capacity, discharge resistance, step-down transformer, wave reception filtering circuit and automatic gain control unit; Described piezo-resistance V21, step-down transformer T and automatic gain control unit parallel connection; 2 described safety capacitor C 21 and C22 symmetry are connected between piezo-resistance V21 and step-down transformer T; The two ends of safety capacitor C 21 are connected with discharge resistance R21; The two ends of safety capacitor C 21 are connected with discharge resistance R22; Described in 2 groups, wave reception filtering circuit C41-L1 and C42-L2 are connected between step-down transformer and automatic gain control unit;
Described filter circuit C41-L1 is comprised of the capacitor C 41 of connecting and inductance L 1; Described filter circuit C42-L2 is comprised of the capacitor C 42 of connecting and inductance L 2; And at the two ends of inductance L 1, be parallel with capacitor C 44, be parallel with automatic gain control unit described in capacitor C 45. adopt AGC controller at the two ends of inductance L 2, its structural topology figure as shown in Figure 7.
Described data acquisition calorie requirement has sampling rate more than 10MS/s, and the power that bears of input port is more than 10dBm; Described controller adopts PC or notebook computer.
The utility model also provides a kind of voltage Power Line Carrier Channel decay testing method based on orthogonal signalling, with test macro described above, comprises the steps:
A, obtain the signal level U of carrier signal transmitting terminal
s: the controller of signal sending end sends instruction to orthogonal signalling output system, sends the orthogonal two-way carrier signal of single frequency; By sending coupling circuit, be coupled on power line; Described transmission coupling circuit is the signal coupling on power line, and utilizes data collecting card to gather the time-domain signal on power line, is finally transferred to controller, and described controller carries out Storage and Processing by the data of test, obtains the signal level U of carrier signal transmitting terminal
s;
B, obtain the signal level U of carrier signal receiving terminal
r: the controller of signal sending end sends instruction to orthogonal signalling output system, sends the orthogonal two-way carrier signal of single frequency, by sending coupling circuit, is coupled on power line; The reception coupling circuit of signal receiving end is by the signal coupling on power line, and utilize data collecting card to gather the time-domain signal on power line, finally be transferred to controller, described controller carries out Storage and Processing by the data of test, obtains the signal level U of carrier signal receiving terminal
r.
The signal level U of carrier signal transmitting terminal
ssignal level U with carrier signal receiving terminal
rall time-domain signal is obtained by Fourier transform, expression formula is as follows:
Wherein: f (t) is the time domain voltage signal gathering with signal data card, and t represents the time, and ω represents the frequency of signal testing signal.
Sinusoidal signal and cosine signal that the related power line attenuation test system of the utility model utilizes doubleway output to have orthogonality relation (90 ° of phase phasic differences) carry out voltage Power Line Carrier Channel attenuation test.As shown in Figure 2, cosine signal (Y
1=A*Cos (ω t)) is exported by I passage, sinusoidal signal (Y
2=A*Sin (ω t)) is exported by Q passage.The phase difference of this signal with orthogonality relation, can, along with the variation of channel, not remain orthogonal, and phase difference remains 90 °, but the amplitude of this two-way carrier signal can synchronously change along with the variation of voltage Power Line Carrier Channel.Therefore, by transmitting terminal and receiving terminal simultaneously collection signal just can obtain the level magnitude of the signal at two ends.
C, determine test macro decay, test macro transmitting terminal signal to noise ratio snr
swith test macro receiving terminal signal to noise ratio snr
r.
The first step: first transmitting terminal sends the signal of a certain single-frequency point;
Second step: the while is passed through the time-domain signal of data collecting card collection signal at a high speed at transmitting terminal and receiving terminal;
The 3rd step: the time-domain signal of collection is carried out to fast Fourier transform, calculate the level value of the signal in this moment;
The 4th step: shutdown signal, by the method for above-mentioned second step and the 3rd step, calculates the level value of noise;
The 5th step: change next frequency, repeat the signal of above-mentioned second step to the four steps.
Carry out successively the test of all frequencies.
Like this, just can test out successively transmitting terminal and receiving terminal place noise and signal.
By sending letter, hold the data of test and the data of receiving terminal test to be placed in the same coordinate system, calculate decay and signal to noise ratio.
As shown in Figure 5, shown in label 1 in figure is transmitting terminal signal level (Send Signal), shown in label 3 is the level (Receive Signal) of receiving end signal, and the signal level that decays to receiving terminal of transmitting terminal and receiving terminal deducts the signal level of transmitting terminal so: i.e. Attention=(Receive Signal)-(Send Signal) or Δ=U
r-U
s.
As shown in Figure 5, shown in label 1 in figure is transmitting terminal signal level (Send Signal), shown in label 2 is the level (Send Noise) of transmitting terminal noise, and the signal level that the signal to noise ratio of transmitting terminal is transmitting terminal so deducts the noise level of transmitting terminal, that is:
SNR
S=(Send?Signal)-(Send?Noise)=U
S-(Send?Noise)。
Data collecting card directly tests out the magnitude of voltage that signal converts in time, and wherein the noise level of transmitting terminal is the voltage signal gathering with data collecting card, and then, with obtaining through Fourier transform, expression formula is suc as formula (1).
As shown in Figure 5, shown in label 3 in figure is receiving end signal level (Receive Signal), shown in label 4 is the level (Receive Noise) of receiving terminal noise, and the signal level that the signal to noise ratio of receiving terminal is receiving terminal so deducts the noise level of receiving terminal, that is:
SNR
R=(Receive?Signal)-(Receive?Noise)U
R-(Receive?Noise)。
Data-signal capture card directly tests out the magnitude of voltage that signal converts in time, and wherein the noise level of receiving terminal is the voltage signal gathering with data collecting card, and then, with obtaining through Fourier transform, expression formula is suc as formula (1).
The test macro that the utility model provides and method of testing thereof, utilize doubleway output to have the sinusoidal signal of orthogonality relation (90 ° of phase phasic differences) and test macro and the method that cosine signal carries out voltage Power Line Carrier Channel decay.As shown in Figure 2, cosine signal (Y
1=A*Cos (ω t)) is exported by I passage, sinusoidal signal (Y
2=A*Sin (ω t)) is exported by Q passage.The phase difference of this signal with orthogonality relation, can, along with the variation of channel, not remain orthogonal, and phase difference remains 90 ° (as shown in Figure 3), but the amplitude of this two-way carrier signal can synchronously change along with the variation of voltage Power Line Carrier Channel.Therefore can sharp measure in this way the amplitude attenuation of voltage Power Line Carrier Channel.
This two-way has strict orthogonal and is related to carrier signal, is equivalent to carry out mark to signal, therefore can distinguish with the noise of other same frequency.Therefore, utilize the method just can measure very accurately the level of signal and noise, test out more accurately the signal to noise ratio (snr) of power line carrier signal.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although the utility model is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement embodiment of the present utility model, and do not depart from any modification of the utility model spirit and scope or be equal to replacement, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (5)
1. the voltage Power Line Carrier Channel attenuation test system based on orthogonal signalling, described system comprises the carrier signal transmitting terminal and the signal receiving end that are connected on power line; It is characterized in that, described signal sending end comprises the orthogonal signalling output system, transmission coupling circuit, data collecting card and the controller that are in turn connected into closed-loop structure; Described signal receiving end comprises the reception coupling circuit, data collecting card and the controller that connect successively.
2. voltage Power Line Carrier Channel attenuation test system as claimed in claim 1, is characterized in that, described orthogonal signalling output system comprises orthogonal signalling generation module;
Described orthogonal signalling generation module has two-way carrier channel, and the signal orthogonality relation each other of output, a wherein road carrier channel output cosine signal, another road carrier channel output sinusoidal signal; Two paths of signals exports power line to by the filter, signal amplifier, power amplifier and the coupler that connect successively in orthogonal signalling output system respectively.
3. voltage Power Line Carrier Channel attenuation test system as claimed in claim 1, is characterized in that, the controller of signal sending end sends instruction to orthogonal signalling output system, sends the orthogonal two-way carrier signal of single frequency; By sending coupling circuit, be coupled on power line; Described transmission coupling circuit is the signal coupling on power line, and utilizes data collecting card to gather the time-domain signal on power line, is finally transferred to controller, and described controller carries out Storage and Processing by the data of test, obtains the signal level U of carrier signal transmitting terminal
s;
The controller of signal sending end sends instruction to orthogonal signalling output system, sends the orthogonal two-way carrier signal of single frequency, by sending coupling circuit, is coupled on power line; The reception coupling circuit of signal receiving end is by the signal coupling on power line, and utilize data collecting card to gather the time-domain signal on power line, finally be transferred to controller, described controller carries out Storage and Processing by the data of test, obtains the signal level U of carrier signal receiving terminal
r.
4. voltage Power Line Carrier Channel attenuation test system as claimed in claim 1, is characterized in that, described transmission coupling circuit comprises piezo-resistance, safety electric capacity, discharge resistance, step-down transformer, transmission filter circuit and bidirectional diode;
Described piezo-resistance, step-down transformer and bidirectional diode parallel connection; 2 described safety electric capacity symmetries are connected between piezo-resistance and step-down transformer; The two ends of each safety electric capacity are all connected with discharge resistance; Described in 2 groups, sending filter circuit is connected between step-down transformer and bidirectional diode; The output of described bidirectional diode D1 is connected with signal receiving end; Described transmission filter circuit is comprised of the electric capacity of connecting and inductance;
Described data acquisition calorie requirement has sampling rate more than 10MS/s, and the power that bears of input port is more than 10dBm;
Described controller adopts PC or notebook computer.
5. voltage Power Line Carrier Channel attenuation test system as claimed in claim 1, is characterized in that, described reception coupling circuit comprises piezo-resistance, safety electric capacity, discharge resistance, step-down transformer, wave reception filtering circuit and automatic gain control unit;
Described piezo-resistance, step-down transformer and bidirectional diode parallel connection; 2 described safety electric capacity symmetries are connected between piezo-resistance and step-down transformer; The two ends of each safety electric capacity are all connected with discharge resistance; Described in 2 groups, wave reception filtering circuit is connected between step-down transformer and automatic gain control unit; The output of described automatic gain control unit is connected with signal sending end; Described wave reception filtering circuit is comprised of the capacitor of connecting and inductance, and is parallel with electric capacity at the two ends of described inductance; Described automatic gain control unit adopts AGC controller.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532591A (en) * | 2013-10-28 | 2014-01-22 | 国家电网公司 | Orthogonal signal based test system and method for power line carrier channel attenuation |
| CN105785200A (en) * | 2016-04-29 | 2016-07-20 | 国网浙江省电力公司绍兴供电公司 | Operation equipment correspondence testing device |
| CN110581720A (en) * | 2019-09-04 | 2019-12-17 | 武汉长光科技有限公司 | testing device, system and testing method for converting G.hn PLC power line into coaxial line |
-
2013
- 2013-10-28 CN CN201320666734.4U patent/CN203563066U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532591A (en) * | 2013-10-28 | 2014-01-22 | 国家电网公司 | Orthogonal signal based test system and method for power line carrier channel attenuation |
| CN103532591B (en) * | 2013-10-28 | 2015-09-23 | 国家电网公司 | Based on voltage Power Line Carrier Channel attenuation test system and the method thereof of orthogonal signalling |
| CN105785200A (en) * | 2016-04-29 | 2016-07-20 | 国网浙江省电力公司绍兴供电公司 | Operation equipment correspondence testing device |
| CN110581720A (en) * | 2019-09-04 | 2019-12-17 | 武汉长光科技有限公司 | testing device, system and testing method for converting G.hn PLC power line into coaxial line |
| CN110581720B (en) * | 2019-09-04 | 2021-05-18 | 武汉长光科技有限公司 | Testing device, system and testing method for converting G.hn PLC power line into coaxial line |
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Effective date of registration: 20160429 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: China Electric Power Research Institute Patentee after: STATE GRID SMART GRID Research Institute Patentee after: STATE GRID HEBEI ELECTRIC POWER Co. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee before: State Grid Corporation of China Patentee before: China Electric Power Research Institute Patentee before: STATE GRID HEBEI ELECTRIC POWER Co. |
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Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: China Electric Power Research Institute Patentee after: GLOBAL ENERGY INTERCONNECTION Research Institute Patentee after: STATE GRID HEBEI ELECTRIC POWER Co. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee before: State Grid Corporation of China Patentee before: China Electric Power Research Institute Patentee before: STATE GRID SMART GRID Research Institute Patentee before: STATE GRID HEBEI ELECTRIC POWER Co. |
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