CN111880225A - Cable detector device and method for dynamically filtering environmental interference - Google Patents
Cable detector device and method for dynamically filtering environmental interference Download PDFInfo
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- CN111880225A CN111880225A CN202010905139.6A CN202010905139A CN111880225A CN 111880225 A CN111880225 A CN 111880225A CN 202010905139 A CN202010905139 A CN 202010905139A CN 111880225 A CN111880225 A CN 111880225A
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- 230000007613 environmental effect Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000001914 filtration Methods 0.000 title claims abstract description 20
- 230000008030 elimination Effects 0.000 claims abstract description 11
- 238000003379 elimination reaction Methods 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 239000000523 sample Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 11
- 239000002184 metal Substances 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000005672 electromagnetic field Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/36—Recording data
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Abstract
The embodiment of the invention relates to the technical field of metal pipeline detection, in particular to a cable detector device and a method for dynamically filtering environmental interference, wherein the cable detector device comprises a transmitter and a receiver, the transmitter comprises a timer and a control switch, and the control switch is configured to periodically transmit an output signal based on a received signal source at a controller of the timer; the receiver comprises a signal receiving circuit, an A/D conversion circuit, an effective signal judgment circuit, a signal intensity calculation circuit and a noise elimination circuit which are sequentially connected in series, wherein a noise intensity calculation circuit is also connected in series between the effective signal judgment circuit and the noise elimination circuit. The embodiment of the invention has the beneficial effects that: the cable detector can directly enter a working state without calibration before working; the operation is simpler; the environmental noise can be dynamically filtered, and the instrument can accurately work in high-voltage lines, machine rooms and other high-interference environments; the error that the measuring accuracy of instrument itself brought can dynamic calibration, promotes the rate of accuracy of surveying.
Description
Technical Field
The invention relates to the technical field of metal pipeline detection, in particular to a cable detector device and a method for dynamically filtering environmental interference.
Background
The cable detector consists of a group of signal transmitters and receivers. The method is generally used for routing and positioning of metal pipelines such as electric cables, optical cables (optical cables with metal reinforced cores), long-distance tracking, depth measurement of underground metal pipelines and the like. The transmitter transmits a low-frequency (generally less than 200kHz) alternating current signal to the target cable, and the receiver acquires information such as the route and the depth of the cable by detecting the direction and the strength of an electromagnetic field radiated by the target cable.
In the actual use process, electromagnetic field interference (namely, environmental noise) exists around us at any moment, and the interference mainly comes from the following sources: electrical appliances in operation, power lines, base station signals, etc. Therefore, the receiver of the cable detector must filter the electromagnetic field interference of the environment itself, and accurately recover the electromagnetic field signal radiated by the target pipeline itself, so as to accurately detect the target pipeline. Therefore, filtering out ambient noise is an essential function of the receiver.
The prior art is a static ambient noise filtering method, which sequentially and statically filters out ambient noise before the cable detection operation starts. The method comprises the following steps: 1) before the transmitter sends the low-frequency electric signal to the target cable, the receiver samples and records the environmental noise of the target frequency; 2) starting a transmitter to transmit a signal of a target frequency to a target cable, and formally starting working; 3) and the receiver subtracts the environmental noise from the received signal with the target frequency to restore the real signal on the target cable.
The disadvantages of this method are as follows:
the use scenario of the cable probe determines that the receiver needs to continuously probe along the target cable, but the environmental variables may not be the same at different locations. For example, in the process of detecting a cable several kilometers long, the cable may need to pass through the lower part of the high-voltage wire, and the static filtering method is performed before the detection operation starts, so that the environmental noise of the high-voltage wire occurring in the detection process cannot be filtered, and the effective operation of the detection operation is affected. In this case, the transmitter can only be notified to restart at a far-away transmitting end, and static noise filtering is performed again in cooperation with the receiver before starting, so that the working efficiency is greatly reduced.
In some specific scenes, the environmental noise may also be suddenly enhanced and weakened, and the existence of the change cannot be obviously judged through a high-voltage wire, at the moment, the static filtering method cannot accurately filter the environmental noise, and the detected environmental noise is not strictly consistent with the filtered environmental noise, so that the detection result is influenced.
Accordingly, there is a need for a cable probe device that dynamically filters out environmental interference to overcome the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems, that is, to solve the problems of low detection efficiency and inaccurate detection result, a first aspect of the embodiment of the present invention discloses a cable detector apparatus for dynamically filtering environmental interference, including a transmitter and a receiver, wherein:
the transmitter includes a timer and a control switch configured to periodically transmit an output signal based on a received signal source at a controller of the timer;
the receiver comprises a signal receiving circuit, an A/D conversion circuit, an effective signal judgment circuit, a signal intensity calculation circuit and a noise elimination circuit which are sequentially connected in series, wherein a noise intensity calculation circuit is also connected in series between the effective signal judgment circuit and the noise elimination circuit, wherein:
the signal receiving circuit is configured to receive the output signal;
the A/D conversion circuit is configured to convert the output signal into a digital signal;
the valid signal decision circuit is configured to decide validity of the digital signal;
the signal strength calculation circuit is configured to calculate a signal strength of the digital signal;
the noise intensity calculation circuit is configured to calculate a noise intensity of the digital signal;
the noise elimination circuit is configured to eliminate the noise of the effective signal with the signal intensity smaller than the preset signal intensity and the noise intensity larger than the preset noise intensity.
The second aspect of the embodiment of the invention discloses a method for dynamically filtering environmental interference, which comprises the following steps:
the transmitter periodically transmits an output signal to the target cable, and the receiver periodically samples the environmental noise in the signal interruption time slot and periodically filters the sampled environmental noise in the signal working time slot.
The embodiment of the invention has the beneficial effects that:
1. the existing scheme needs to finish the calibration before detection and capture the environmental noise. The cable detector can directly enter a working state without calibration before working. The operation is simpler.
2. The invention can dynamically filter out environmental noise, and the instrument can accurately work in high-voltage line, machine room and other high-interference environments.
3. Besides dynamically filtering the environmental noise, the invention can also dynamically calibrate the error brought by the measurement precision of the instrument, and improve the accuracy of detection.
Drawings
FIG. 1 is a schematic diagram of the present invention for filtering ambient noise;
FIG. 2 is a block diagram of an embodiment of a transmitter;
FIG. 3 is a block diagram of an embodiment of a receiver;
fig. 4 is a diagram illustrating the operation of filtering the ambient noise according to the prior art.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
Referring to fig. 1 to 4, a first aspect of the embodiments of the present invention discloses a cable probe apparatus for dynamically filtering environmental interference, including a transmitter and a receiver, wherein:
the transmitter includes a timer and a control switch configured to periodically transmit an output signal based on a received signal source at a controller of the timer;
the receiver comprises a signal receiving circuit, an A/D conversion circuit, an effective signal judgment circuit, a signal intensity calculation circuit and a noise elimination circuit which are sequentially connected in series, wherein a noise intensity calculation circuit is also connected in series between the effective signal judgment circuit and the noise elimination circuit, wherein:
the signal receiving circuit is configured to receive the output signal;
the A/D conversion circuit is configured to convert the output signal into a digital signal;
the valid signal decision circuit is configured to decide validity of the digital signal;
the signal strength calculation circuit is configured to calculate a signal strength of the digital signal;
the noise intensity calculation circuit is configured to calculate a noise intensity of the digital signal;
the noise elimination circuit is configured to eliminate the noise of the effective signal with the signal intensity smaller than the preset signal intensity and the noise intensity larger than the preset noise intensity.
From the operation flow of the instrument: the existing scheme has a calibration link before the instrument works, and environmental noise is sampled in the link so as to be filtered during actual work; the invention does not need a calibration link to filter out environmental noise, and the instrument can directly enter a working link.
Transmitter signal transmission from the instrument: in the existing scheme, a transmitter transmits a low-frequency alternating current signal to a target cable in a working link, and the signal is continuously uninterrupted in the working process; the invention sends low-frequency alternating current signal to the target cable at fixed time by the transmitter, the signal is periodically interrupted in the whole working process, the receiver periodically samples the environmental noise in the signal interruption time slot, and periodically filters the sampled environmental noise in the signal working time slot.
Sampling and filtering from the ambient noise of the instrument's receiver: in the existing scheme, a receiver finishes sampling of an environment variable in a calibration link, and the receiver filters the environment variable in a working process; in the invention, the receiver dynamically samples the environment variable in the signal interruption time slot and filters the environment variable in the signal recovery time slot.
The output signal is a low frequency alternating current signal.
It should be noted that the timer, the control switch, the signal receiving circuit, the a/D conversion circuit, the effective signal decision circuit, the signal strength calculation circuit, the noise strength calculation circuit, and the noise cancellation circuit may all adopt existing circuit modules, and are not described herein again.
The second aspect of the embodiments of the present invention discloses a method for dynamically filtering environmental interference, where the method uses any one of the above-mentioned devices, and the method includes the steps of:
the transmitter periodically transmits an output signal to the target cable, and the receiver periodically samples the environmental noise in the signal interruption time slot and periodically filters the sampled environmental noise in the signal working time slot.
It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (3)
1. A cable probe apparatus for dynamically filtering environmental interference, comprising a transmitter and a receiver, wherein:
the transmitter includes a timer and a control switch configured to periodically transmit an output signal based on a received signal source at a controller of the timer;
the receiver comprises a signal receiving circuit, an A/D conversion circuit, an effective signal judgment circuit, a signal intensity calculation circuit and a noise elimination circuit which are sequentially connected in series, wherein a noise intensity calculation circuit is also connected in series between the effective signal judgment circuit and the noise elimination circuit, wherein:
the signal receiving circuit is configured to receive the output signal;
the A/D conversion circuit is configured to convert the output signal into a digital signal;
the valid signal decision circuit is configured to decide validity of the digital signal;
the signal strength calculation circuit is configured to calculate a signal strength of the digital signal;
the noise intensity calculation circuit is configured to calculate a noise intensity of the digital signal;
the noise elimination circuit is configured to eliminate the noise of the effective signal with the signal intensity smaller than the preset signal intensity and the noise intensity larger than the preset noise intensity.
2. The cable probe apparatus for dynamically filtering environmental interference according to claim 1, wherein said output signal is a low frequency ac signal.
3. A method for dynamically filtering out environmental interference by using the apparatus of claim or 2, comprising the steps of:
the transmitter periodically transmits an output signal to the target cable, and the receiver periodically samples the environmental noise in the signal interruption time slot and periodically filters the sampled environmental noise in the signal working time slot.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010905139.6A CN111880225A (en) | 2020-09-01 | 2020-09-01 | Cable detector device and method for dynamically filtering environmental interference |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010905139.6A CN111880225A (en) | 2020-09-01 | 2020-09-01 | Cable detector device and method for dynamically filtering environmental interference |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1338164A (en) * | 1999-01-25 | 2002-02-27 | 艾利森公司 | Detecting and minimizing the effects of transmitter noise on signal strength measurement in a wireless communication system |
| CN101281255A (en) * | 2008-06-04 | 2008-10-08 | 河北煤炭科学研究所 | Method for detecting down-hole instant changeable electromagnetic ultralong distance |
| CN106027084A (en) * | 2016-05-18 | 2016-10-12 | 昆山龙腾光电有限公司 | Method and device for reducing noises |
| CN108683466A (en) * | 2018-04-26 | 2018-10-19 | 深圳市盛路物联通讯技术有限公司 | A kind of intelligent terminal and radio frequency interference detection method |
| CN108828542A (en) * | 2018-08-03 | 2018-11-16 | 中国航空工业集团公司雷华电子技术研究所 | A kind of airborne weather radar noise periods dynamic calibration method |
| CN110796614A (en) * | 2019-10-18 | 2020-02-14 | 腾讯科技（深圳）有限公司 | Image processing method, image processing apparatus, and computer-readable storage medium |
| CN212623123U (en) * | 2020-09-01 | 2021-02-26 | 贵州朗星智能有限公司 | Cable detector device capable of dynamically filtering environmental interference |
-
2020
- 2020-09-01 CN CN202010905139.6A patent/CN111880225A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1338164A (en) * | 1999-01-25 | 2002-02-27 | 艾利森公司 | Detecting and minimizing the effects of transmitter noise on signal strength measurement in a wireless communication system |
| CN101281255A (en) * | 2008-06-04 | 2008-10-08 | 河北煤炭科学研究所 | Method for detecting down-hole instant changeable electromagnetic ultralong distance |
| CN106027084A (en) * | 2016-05-18 | 2016-10-12 | 昆山龙腾光电有限公司 | Method and device for reducing noises |
| CN108683466A (en) * | 2018-04-26 | 2018-10-19 | 深圳市盛路物联通讯技术有限公司 | A kind of intelligent terminal and radio frequency interference detection method |
| CN108828542A (en) * | 2018-08-03 | 2018-11-16 | 中国航空工业集团公司雷华电子技术研究所 | A kind of airborne weather radar noise periods dynamic calibration method |
| CN110796614A (en) * | 2019-10-18 | 2020-02-14 | 腾讯科技（深圳）有限公司 | Image processing method, image processing apparatus, and computer-readable storage medium |
| CN212623123U (en) * | 2020-09-01 | 2021-02-26 | 贵州朗星智能有限公司 | Cable detector device capable of dynamically filtering environmental interference |
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