CN103674177A - Signal processing method and device - Google Patents
Signal processing method and device Download PDFInfo
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- CN103674177A CN103674177A CN201310703615.6A CN201310703615A CN103674177A CN 103674177 A CN103674177 A CN 103674177A CN 201310703615 A CN201310703615 A CN 201310703615A CN 103674177 A CN103674177 A CN 103674177A
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Abstract
The invention provides a signal processing method and device. The signal processing method comprises the steps that firstly, sampling is conducted on original echo signals in the low-frequency sampling way, a sampling result is processed correspondingly so that an echo curve can be obtained, and then effective echo signals in the original echo signals are positioned roughly; high-frequency sampling is conducted on the effective echo signals according to location information obtained through rough positioning, and then real effective echo signals are obtained. According to the signal processing method and device, high-frequency sampling is conducted on the effective echo signals instead of being conducted on all the original echo signals, as a result, the resolution ratio of a radar level meter is guaranteed, and data processing speed of the radar level meter is improved.
Description
Technical field
The present invention relates to level gauging, relate in particular a kind of signal processing method and device.
Background technology
Along with petroleum and chemical industry industrial expansion, level meter has obtained application more and more widely in field of industrial automatic control.The level meter existing in the market be take radar levelmeter as main, such as: guided wave radar material level gauge and pulse radar material level meter.
Its principle of work is: the pulse signal of being exported by signal output unit is gone out by guided wave bar or antenna transmission, and while running into measured medium, partial pulse signal is reflected back.Radar levelmeter is sampled to original echoed signals by intelligent software, obtains effective echo, thereby calculates the material level propagation of measured medium.If sample frequency is lower, the resolution that instrument itself is measured is lower, if instead sample frequency is higher, has reduced the processing speed of instrument to data.
Summary of the invention
In view of this, the invention provides a kind of signal processing method and device, with when guaranteeing the resolution of radar levelmeter, improve the processing speed of radar levelmeter to data.
For achieving the above object, the invention provides following technical scheme:
A signal processing method, described method is applied to radar levelmeter, comprising:
The original echoed signals being reflected by measured medium is carried out to low-frequency sampling, obtain a plurality of original object points;
Amplitude to described a plurality of original object points is processed, and obtains echo curve;
According to described echo curve, effective echoed signal is carried out to coarse localization;
The positional information obtaining according to coarse localization, gathers described effective echoed signal by high frequency sampling, obtains real effectively echoed signal.
Preferably, the described amplitude to described a plurality of impact points is processed, and obtains echo curve, comprising:
According to preset algorithm, the amplitude of described a plurality of original object points is calculated, obtain and described a plurality of original object points a plurality of virtual target point one to one;
Amplitude according to described a plurality of original object points and described a plurality of false target points, obtains echo curve according to preset algorithm.
Preferably, described method also comprises: to the described effective echoed signal of described radar levelmeter output.
A signal processing apparatus, described device comprises:
According to predeterminated frequency, the original echoed signals being reflected by measured medium is sampled, obtain the sampling unit of a plurality of original object points;
According to preset algorithm, the sampled result of described sampling unit is processed, obtained the signal processing unit of echo curve;
According to described echo curve, effective echoed signal is carried out the coarse localization unit of coarse localization;
The positional information obtaining according to coarse localization, controls described sampling unit and by high frequency sampling, described effective echoed signal is gathered, and obtains the real effectively accurate positioning unit of echoed signal.
Preferably, described signal processing unit comprises:
According to preset algorithm, the amplitude of described a plurality of original object points is calculated, obtain and described a plurality of original object points the first computing unit of a plurality of virtual target point one to one;
According to the amplitude of described a plurality of original object points and described a plurality of false target points, according to preset algorithm, obtain the second computing unit of echo curve.
Preferably, described device also comprises: the storage unit of storing the impact point that described sampling unit collects by low-frequency sampling and high frequency sampling.
Preferably, described device also comprises: the data that described sampling unit is collected are sent to the data transmission unit of described storage unit.
Preferably, described sampling unit adopts AD sampling unit.
Preferably, described data transmission unit adopts DMA data transmission unit.
Preferably, described device also comprises: the display that shows described effective echoed signal.
Known via above-mentioned technical scheme, compared with prior art, the present invention openly provides a kind of signal processing method and device.First the method samples to original echoed signals by the mode of low-frequency sampling, and sampled result is processed accordingly, obtains echo curve, thereby coarse localization is carried out in the position of the effective echoed signal in original echoed signals.And then the positional information obtaining according to coarse localization, carries out high frequency sampling to effective echoed signal, thereby obtain real effectively echoed signal.The present invention carries out high frequency sampling to effect echoed signal, and not all original echoed signals is all carried out to high frequency sampling, thereby when guaranteeing the resolution of radar levelmeter, improves the processing speed of radar levelmeter to data, improves the response speed of instrument.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 shows the schematic flow sheet of an embodiment of a kind of signal processing method of the present invention;
Fig. 2 shows the structural representation of an embodiment of a kind of signal processing apparatus of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Referring to Fig. 1, show the schematic flow sheet of an embodiment of a kind of signal processing method of the present invention.The method is applied to the processing of the original echoed signals that guided wave radar material level gauge and pulse radar material level meter reflect measured medium.
The method comprises:
101: the original echoed signals being reflected by measured medium is carried out to low-frequency sampling, obtain a plurality of original object points.
The electromagnetic signal of the signal transmitter unit output of guided wave radar material level gauge or pulse radar material level meter or pulse signal arrive measured medium during with interface air, because specific inductive capacity changes, thereby can be at the Surface Creation original echoed signals of measured medium.It should be noted that, due to external influence, in this original echoed signals, comprise effective echoed signal and undesired signal, guided wave radar material level gauge and pulse radar material level meter need to be identified the effective echoed signal in original echoed signals, thereby measure the thing position of measured medium.
In the present embodiment, first the present invention carries out low frequency employing to the original echoed signals reflecting through measured medium, obtains a plurality of original object points, such as: use the sample rate of lower frequency to gather 1000 original object points.
102: the amplitude to described a plurality of original object points is processed, and obtains echo curve.
It should be noted that, this process comprises:
Steps A: according to preset algorithm, the amplitude of a plurality of original object points is calculated, obtained and a plurality of original object points a plurality of virtual target point one to one.
1000 the original object points of take are below example, introduce and how to obtain virtual target point:
First the amplitude using the amplitude of the 1000th original object point as the 1000th virtual target point.
Relatively the amplitude of the 999th original object point and the amplitude of the 1000th virtual target point are big or small, when the former is greater than the latter, the amplitude of the 1000th virtual target point is added to 1 size of the amplitude as the 999th virtual target point, when the latter is greater than the former, the amplitude of the 1000th virtual target point is subtracted to 2 sizes of the amplitude as the 999th virtual target point.Adopt above-mentioned algorithm, obtain successively the amplitude size of 1000 virtual target point.
Step B: the amplitude according to a plurality of original object points and a plurality of false target points, obtains echo curve according to preset algorithm.
By the amplitude of a plurality of original object points, deduct the amplitude of putting corresponding virtual target point with a plurality of original objects, and be depicted as oscillogram, thereby obtain echo curve.
103: according to described echo curve, effective echoed signal is carried out to coarse localization.
It should be noted that, because measured medium is different, thereby the original echoed signals reflecting is also different, and the mode of effective echo in original echoed signals being carried out to coarse localization is also relatively different.At present, by calculating the factor of the occupied area of crest size or waveform, effective echoed signal is positioned.
104: the positional information obtaining according to coarse localization, by high frequency sampling, described effective echoed signal is gathered, obtain real effectively echoed signal.
Because the sample frequency in step 101 is lower, thereby the precision of the effective echoed signal finding is lower.In order to improve the precision of effective echoed signal, in step 103, determine behind the position of effective echo, the effective echoed signal in this position is carried out to high frequency sampling, thereby obtain real effectively echoed signal.
Compared with prior art, the present invention openly provides a kind of signal processing method.First the method samples to original echoed signals by the mode of low-frequency sampling, and sampled result is processed accordingly, obtains echo curve, thereby coarse localization is carried out in the position of the effective echoed signal in original echoed signals.And then the positional information obtaining according to coarse localization, carries out high frequency sampling to effective echoed signal, thereby obtain real effectively echoed signal.The present invention just carries out high frequency sampling to effect echoed signal, and not all original echoed signals is all carried out to high frequency sampling, thereby when guaranteeing the resolution of radar levelmeter, improves the processing speed of radar levelmeter to data.
It should be noted that, the invention also discloses the signal processing apparatus mutually applicable with above-mentioned signal processing method.Referring to Fig. 2, show the structural representation of an embodiment of a kind of signal processing apparatus of the present invention.
In the present embodiment, this device comprises:
According to predeterminated frequency, the original echoed signals being reflected by measured medium is sampled, obtain the sampling unit 21 of a plurality of original object points,
According to preset algorithm, the sampled result of described sampling unit is processed, obtain the signal processing unit 22 of echo curve, wherein, this signal processing unit 22 comprises: according to preset algorithm, amplitude to a plurality of original object points is calculated, obtain with a plurality of state original object point one to one a plurality of virtual target point the first computing unit 31 and according to the difference in magnitude of a plurality of original object points and a plurality of false target points, obtain the second computing unit 32 of echo curve.
Be connected with signal processing unit, according to echo curve, effective echoed signal carried out the coarse localization unit 23 of coarse localization;
And the positional information obtaining according to coarse localization, control described sampling unit and by high frequency sampling, described effective echoed signal is gathered, obtain the real effectively accurate positioning unit 24 of echoed signal.
It should be noted that, in the present embodiment, this device also comprises: storage unit 25 and data transmission unit 26.When sampling unit 21 completes after sampling, the data that this device trigger data transmission unit 26 gathers sampling unit 21 are sent to storage unit 25.And then the data of 22 pairs of storage unit of signal processing unit, 25 storages are processed.
Optionally, this sampling unit 21 adopts AD sampling unit, and data transmission unit 26 adopts DMA data transmission unit.
Finally, also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the application.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can be in the situation that do not depart from the application's spirit or scope, realization in other embodiments.Therefore, the application will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a signal processing method, described method is applied to radar levelmeter, it is characterized in that, comprising:
The original echoed signals being reflected by measured medium is carried out to low-frequency sampling, obtain a plurality of original object points;
Amplitude to described a plurality of original object points is processed, and obtains echo curve;
According to described echo curve, effective echoed signal is carried out to coarse localization;
The positional information obtaining according to coarse localization, gathers described effective echoed signal by high frequency sampling, obtains real effectively echoed signal.
2. method according to claim 1, is characterized in that, the described amplitude to described a plurality of impact points is processed, and obtains echo curve, comprising:
According to preset algorithm, the amplitude of described a plurality of original object points is calculated, obtain and described a plurality of original object points a plurality of virtual target point one to one;
Amplitude according to described a plurality of original object points and described a plurality of false target points, obtains echo curve according to preset algorithm.
3. method according to claim 1, is characterized in that, described method also comprises: to the described effective echoed signal of described radar levelmeter output.
4. a signal processing apparatus, is characterized in that, described device comprises:
According to predeterminated frequency, the original echoed signals being reflected by measured medium is sampled, obtain the sampling unit of a plurality of original object points;
According to preset algorithm, the sampled result of described sampling unit is processed, obtained the signal processing unit of echo curve;
According to described echo curve, effective echoed signal is carried out the coarse localization unit of coarse localization;
The positional information obtaining according to coarse localization, controls described sampling unit and by high frequency sampling, described effective echoed signal is gathered, and obtains the real effectively accurate positioning unit of echoed signal.
5. device according to claim 4, is characterized in that, described signal processing unit comprises:
According to preset algorithm, the amplitude of described a plurality of original object points is calculated, obtain and described a plurality of original object points the first computing unit of a plurality of virtual target point one to one;
According to the amplitude of described a plurality of original object points and described a plurality of false target points, according to preset algorithm, obtain the second computing unit of echo curve.
6. device according to claim 4, is characterized in that, described device also comprises: the storage unit of storing the impact point that described sampling unit collects by low-frequency sampling and high frequency sampling.
7. device according to claim 6, is characterized in that, described device also comprises: the data that described sampling unit is collected are sent to the data transmission unit of described storage unit.
8. device according to claim 4, is characterized in that, described sampling unit adopts AD sampling unit.
9. device according to claim 7, is characterized in that, described data transmission unit adopts DMA data transmission unit.
10. device according to claim 6, is characterized in that, described device also comprises: the display that shows described effective echoed signal.
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| CN104568059A (en) * | 2014-12-31 | 2015-04-29 | 重庆川仪自动化股份有限公司 | Empty tank measuring method by use of guide wave radar level meter |
| CN104568058A (en) * | 2014-12-31 | 2015-04-29 | 重庆川仪自动化股份有限公司 | Guide wave radar level meter |
| CN108225482A (en) * | 2016-12-15 | 2018-06-29 | 重庆川仪自动化股份有限公司 | Suitable for the gain-adaptive adjusting method and system of guided wave radar |
| CN109632046A (en) * | 2017-10-06 | 2019-04-16 | Vega格里沙贝两合公司 | Radar level gauge with the synchronization signal on various boards layer |
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Cited By (6)
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| CN104568059A (en) * | 2014-12-31 | 2015-04-29 | 重庆川仪自动化股份有限公司 | Empty tank measuring method by use of guide wave radar level meter |
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| CN109632046A (en) * | 2017-10-06 | 2019-04-16 | Vega格里沙贝两合公司 | Radar level gauge with the synchronization signal on various boards layer |
| CN109632046B (en) * | 2017-10-06 | 2021-08-13 | Vega格里沙贝两合公司 | Radar level gauge with synchronization signals on different circuit board layers |
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| CN103674177B (en) | 2016-08-17 |
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