CN105785225A - Compensation method of receiving end signal time delay estimation error - Google Patents
Compensation method of receiving end signal time delay estimation error Download PDFInfo
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- CN105785225A CN105785225A CN201610118630.8A CN201610118630A CN105785225A CN 105785225 A CN105785225 A CN 105785225A CN 201610118630 A CN201610118630 A CN 201610118630A CN 105785225 A CN105785225 A CN 105785225A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Position Fixing By Use Of Radio Waves (AREA)
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Abstract
The invention relates to a compensation method of a receiving end signal time delay estimation error. The method comprises the steps of: converting an output signal of a signal source generation device into a plurality of paths of identical signals serving as a plurality of antenna signals; transmitting the antenna signals through a plurality of cables; collecting signals on a signal output end of each cable through the same oscilloscope, and obtaining a plurality of corresponding receiving signals; determining any one of the plurality of cables as a reference cable, using the received signal corresponding to the reference cable as a reference, and calculating the time delays of the receiving signals corresponding to the plurality of cables; and according to the time delays, calculating the length difference between each cable and the reference cable, and according to the length differences, compensating the time delay estimated result of collected signals of the oscilloscope. According to the invention, the positioning error caused by different lengths of the cables for data transmission is reduced.
Description
Technical field
The present invention relates to discharge source field of locating technology in power system, particularly relate to receiving end signal delay estimation compensation of error method.
Background technology
In power system, shelf depreciation or spark discharge are the omens that insulant is aging, fault produces, and the communication equipment near electric line, transformer station, television broadcasting signal etc. also can be caused electromagnetic interference by the produced high frequency radiation electromagnetic wave of electric discharge simultaneously.Therefore, in order to find the aging position of insulant early, avoid insulation fault and avoid the interference to periphery electromagnetic environment, it is necessary to the position of discharge source is accurately positioned.
For the location of discharge source, the algorithm that ultra-high frequency antenna positions is utilized to be widely used.In traditional discharge source Position Research, by coaxial cable, aerial signal is inputted signal and receive oscillograph, on the one hand, it is 0.2ns that the signal owing to adopting receives oscillographic general sampling time interval, and the positioning result error therefore obtained is bigger；On the other hand, the length owing to transmitting each bar coaxial cable of signal is different, also can cause the error of positioning result, and the position error that this error and oscillograph cause is a number of levels, and this error is usually left in the basket.
Along with the renewal of oscilloscope apparatus, the oscillograph (such as, sampling time interval is 0.02ns) of higher sampling time interval can be adopted at present to position research, reduce the positioning result error because oscillograph causes.In this case, the length difference of each bar coaxial cable of transmission signal the time delay estimation difference caused, become the key factor affecting discharge source location positioning precision.
Summary of the invention
Based on this, the present invention provides a kind of receiving end signal delay estimation compensation of error method, it is possible to reduce the position error caused because the length of each bar cable of transmission signal is different.
The technical scheme that the present invention proposes includes:
Receiving end signal delay estimation compensation of error method, including:
The output signal of signal source generating means is converted to the signal that multichannel is identical, as multiple aerial signals；Respectively described aerial signal is transmitted by a plurality of cable；
Gathered the signal of every cable signal outfan by same oscillograph, obtain the reception signal of multiple correspondence；
Determine that in described a plurality of cable any one as reference cable, with reception signal corresponding to described reference cable for benchmark, calculate the time delay received between signal that described a plurality of cable is corresponding；
According to the length difference between described time-delay calculation each bar cable and described reference cable, compensate according to the time delay estimated result that described oscillograph is gathered signal by described length difference.
The receiving end signal delay estimation compensation of error method of technique scheme, by being converted to, by the output signal of signal source generating means, the signal that multichannel is identical, as multiple aerial signals；Respectively described aerial signal is transmitted by a plurality of cable；Gathered the signal of every cable signal outfan by same oscillograph, obtain the reception signal of multiple correspondence；Determine that in described a plurality of cable any one as reference cable, with reception signal corresponding to described reference cable for benchmark, calculate the time delay received between signal that described a plurality of cable is corresponding；According to the length difference between described time-delay calculation each bar cable and described reference cable, compensate according to the time delay estimated result that described oscillograph is gathered signal by described length difference.By means of the invention it is possible to reduce the position error caused because the length of the cable of transmission signal is different.
Accompanying drawing explanation
Fig. 1 is the indicative flowchart of the receiving end signal delay estimation compensation of error method of an embodiment；
Fig. 2 is the hardware environment schematic diagram of the receiving end signal delay estimation compensation of error method of an embodiment.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 is the indicative flowchart of the receiving end signal delay estimation compensation of error method of an embodiment；As it is shown in figure 1, the receiving end signal delay estimation compensation of error method of the present embodiment comprises the steps S1 to S4, details are as follows for each step:
S1, is converted to, by the output signal of signal source generating means, the signal that multichannel is identical, as multiple aerial signals；Respectively described aerial signal is transmitted by a plurality of cable；
The signal wave produced by described signal source generating means in the present embodiment simulates the signal of multiple antenna.Preferably, described cable is coaxial cable, and the output signal of described signal source generating means is standard sine wave or impulse wave, for instance signal waveform that be interval with 25MHz, that frequency domain is 25MHz-500MHz.
As a preferred implementation, by cable adapter, the output signal of signal source generating means can be converted to the signal that multichannel is identical, as multiple aerial signals.It is 4 owing to current standard signal collection receives passage with oscillographic signal, thus the quantity of the cable of the transmission signal of its connection is less than or equal to 4.Therefore, described cable adapter is the adapter of a turn two or turns four, and the quantity of corresponding aerial signal is be more than or equal to 2 and less than or equal to 4.
If it should be understood that oscillographic reception passage is more than 4, for instance 8, corresponding, the output signal of signal source generating means can be converted to the signal that 8 tunnels are identical, respectively described signal is transmitted by 8 cables.Therefore, user can adjust accordingly according to practical situation, but this kind of Adjusted Option should also be as belonging to protection scope of the present invention.
S2, gathers the signal of every cable signal outfan by same oscillograph, obtains the reception signal of multiple correspondence；
It is 4 that current standard signal collection receives passage with oscillographic signal, therefore can be gathered the signal of maximum 4 cable signal outfans by same oscillograph simultaneously.
Preferably, oscillographic sampling time interval described in the present embodiment is 0.02ns or 0.025ns, and oscillographic sampling time interval is more little, oscillograph the position error caused is more little.
S3, it is determined that any one in described a plurality of cable as reference cable, with reception signal corresponding to described reference cable for benchmark, calculates the time delay received between signal that described a plurality of cable is corresponding；
S4, according to the length difference between described time-delay calculation each bar cable and described reference cable, compensates according to the time delay estimated result that described oscillograph is gathered signal by described length difference.
As a preferred implementation, it is determined that any one in described a plurality of cable as reference cable, with reception signal corresponding to described reference cable for benchmark, utilizes cross-correlation function method to calculate the time delay received between signal that a plurality of cable is corresponding；According to the time delay received between the reception signal that signal is corresponding with described reference cable that each bar cable outside described reference cable is corresponding, calculate the length difference of described each bar cable and described reference cable.
With a detailed description of the invention, the receiving end signal delay estimation compensation of error method of the above embodiment of the present invention is illustrated below, specific as follows:
The output signal of signal source generating means is converted to the signal that four tunnels are identical, as four aerial signals；Respectively described aerial signal is transmitted by four coaxial cables (cable 1, cable 2, cable 3 and cable 4).As in figure 2 it is shown, the signal input part of described coaxial cable connects described signal source generating means by described cable adapter, signal output part connects signal corresponding to described oscillograph and receives passage.
Cable 1 therein is elected to be reference cable, the signal of cable 1 respective channel is reference signal waveform, utilizes cross-correlation function method to obtain the time delay (can obtain the meansigma methods of a large amount of signal as end product) between signal waveform and this reference signal waveform of other passages that oscillograph gathers.Such as, time delay between signal waveform and the signal waveform of cable 2 respective channel of cable 1 respective channel is 0.0657ns, between signal waveform and the signal waveform of cable 3 respective channel of cable 1 respective channel, time delay is 0.2013ns, and between signal waveform and the signal waveform of cable 4 respective channel of cable 1 respective channel, time delay is 0.0703ns.Further, the length difference of cable 1 and cable 2, cable 3, cable 4 can be calculated respectively according to described time delay.
Length difference based on the coaxial cable of transmission signal, in based on signal time delay legal position power system during the position of discharge source (signal source), can according to the length difference of described coaxial cable, estimate to compensate to the time delay between receiving end signal, according to the time delay estimated result after compensating, based on the location that the position of signal source is carried out by receiving end signal Time Delay Estimation Method, the position error because coaxial cable length difference causes can be reduced.
By the receiving end signal delay estimation compensation of error method of the present embodiment, the output signal of signal source generating means is converted to the signal that multichannel is identical, as multiple aerial signals；Respectively described aerial signal is transmitted by a plurality of cable；Gathered the signal of every cable signal outfan by same oscillograph, obtain the reception signal of multiple correspondence；Determine that in described a plurality of cable any one as reference cable, with reception signal corresponding to described reference cable for benchmark, calculate the time delay received between signal that described a plurality of cable is corresponding；According to the length difference between described time-delay calculation each bar cable and described reference cable, compensate according to the time delay estimated result that described oscillograph is gathered signal by described length difference.The position error that can reduce the difference of the cable length because transmitting signal and cause；According to the time delay estimated result after compensating, based on the location that the position of signal source is carried out by receiving end signal Time Delay Estimation Method, the position error caused because the cable length of transmission signal is different can be reduced.
It should be noted that, for preceding method embodiment, in order to simplicity describes, it is all expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not by the restriction of described sequence of movement, because according to the present invention, some step can adopt other order or carry out simultaneously.
Embodiment described above only have expressed the several embodiments of the present invention, it is impossible to is interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, it is also possible to making some deformation and improvement, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (9)
1. receiving end signal delay estimation compensation of error method, it is characterised in that including:
The output signal of signal source generating means is converted to the signal that multichannel is identical, as multiple aerial signals；Respectively described aerial signal is transmitted by a plurality of cable；
Gathered the signal of every cable signal outfan by same oscillograph, obtain the reception signal of multiple correspondence；
Determine that in described a plurality of cable any one as reference cable, with reception signal corresponding to described reference cable for benchmark, calculate the time delay received between signal that described a plurality of cable is corresponding；
According to the length difference between described time-delay calculation each bar cable and described reference cable, compensate according to the time delay estimated result that described oscillograph is gathered signal by described length difference.
2. receiving end signal delay estimation compensation of error method according to claim 1, it is characterised in that described by signal source generating means output signal be converted to the signal that multichannel is identical, as multiple aerial signals, including:
By cable adapter, the output signal of signal source generating means being converted to the signal that multichannel is identical, as multiple aerial signals, the quantity of described aerial signal is be more than or equal to 2 and less than or equal to 4.
3. receiving end signal delay estimation compensation of error method according to claim 2, it is characterised in that described cable adapter is the adapter of a turn four, the quantity of described aerial signal is equal to 4；
The signal input part of described cable connects described signal source generating means by described cable adapter, and signal output part connects signal corresponding to described oscillograph and receives passage.
4. receiving end signal delay estimation compensation of error method according to claim 1, it is characterised in that described oscillographic sampling time interval is 0.02ns or 0.025ns.
5. receiving end signal delay estimation compensation of error method according to claim 1, it is characterised in that the output signal of described signal source generating means is standard sine wave or impulse wave.
6. receiving end signal delay estimation compensation of error method according to claim 5, it is characterised in that described standard sine wave or impulse wave be: signal waveform that be interval with 25MHz, that frequency domain is 25MHz-500MHz.
7. receiving end signal delay estimation compensation of error method according to claim 1, it is characterised in that described cable is coaxial cable.
8. receiving end signal delay estimation compensation of error method according to claim 1, it is characterized in that, with reception signal corresponding to described reference cable for benchmark, calculate the time delay received between signal that described a plurality of cable is corresponding, according to the length difference between described time-delay calculation each bar cable and described reference cable, including:
With reception signal corresponding to described reference cable for benchmark, cross-correlation function method is utilized to calculate the time delay received between signal that a plurality of cable is corresponding；
According to the time delay received between the reception signal that signal is corresponding with described reference cable that each bar cable outside described reference cable is corresponding, calculate the length difference of described each bar cable and described reference cable.
9. receiving end signal delay estimation compensation of error method according to claim 1, it is characterised in that the described time delay estimated result described oscillograph being gathered signal according to described length difference compensates, and also includes afterwards:
According to the time delay estimated result after compensating, based on the location that the position of signal source is carried out by receiving end signal Time Delay Estimation Method.
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| CN109412706A (en) * | 2018-11-09 | 2019-03-01 | 成都九华圆通科技发展有限公司 | A kind of direction-finder antenna simulation method and system |
| CN110830081A (en) * | 2019-11-13 | 2020-02-21 | 中国工程物理研究院应用电子学研究所 | Signal coaxial cable transmission distortion compensation method |
| CN111064533A (en) * | 2019-12-25 | 2020-04-24 | 上海科梁信息工程股份有限公司 | Time delay measurement system, time delay measurement method, electronic device, and storage medium |
| CN112397109A (en) * | 2020-11-19 | 2021-02-23 | 成都海光集成电路设计有限公司 | Time delay compensation method for memory signal line |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412706A (en) * | 2018-11-09 | 2019-03-01 | 成都九华圆通科技发展有限公司 | A kind of direction-finder antenna simulation method and system |
| CN109412706B (en) * | 2018-11-09 | 2021-06-08 | 成都九华圆通科技发展有限公司 | Direction-finding antenna simulation method and system |
| CN110830081A (en) * | 2019-11-13 | 2020-02-21 | 中国工程物理研究院应用电子学研究所 | Signal coaxial cable transmission distortion compensation method |
| CN110830081B (en) * | 2019-11-13 | 2021-11-09 | 中国工程物理研究院应用电子学研究所 | Signal coaxial cable transmission distortion compensation method |
| CN111064533A (en) * | 2019-12-25 | 2020-04-24 | 上海科梁信息工程股份有限公司 | Time delay measurement system, time delay measurement method, electronic device, and storage medium |
| CN111064533B (en) * | 2019-12-25 | 2022-04-05 | 上海科梁信息科技股份有限公司 | Time delay measurement system, time delay measurement method, electronic device, and storage medium |
| CN112397109A (en) * | 2020-11-19 | 2021-02-23 | 成都海光集成电路设计有限公司 | Time delay compensation method for memory signal line |
| CN112397109B (en) * | 2020-11-19 | 2023-05-09 | 成都海光集成电路设计有限公司 | Method for compensating time delay of memory signal line |
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