CN113252137A - Radar level gauge microwave path diagnosis and correction method and equipment - Google Patents
Radar level gauge microwave path diagnosis and correction method and equipment Download PDFInfo
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- CN113252137A CN113252137A CN202110659513.3A CN202110659513A CN113252137A CN 113252137 A CN113252137 A CN 113252137A CN 202110659513 A CN202110659513 A CN 202110659513A CN 113252137 A CN113252137 A CN 113252137A
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- 238000003745 diagnosis Methods 0.000 title claims description 43
- 238000012937 correction Methods 0.000 title description 3
- 238000004092 self-diagnosis Methods 0.000 claims abstract description 25
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
Abstract
The present disclosure provides a radar level gauge self-diagnosis method, comprising: the radar level meter transmits microwave signals to the reflector; receiving a reflector echo signal reflected by the reflector by the radar level gauge; and generating operating state information of the radar level gauge based on at least signal characteristics of the reflector echo signal. The present disclosure also provides a radar level gauge.
Description
Technical Field
The disclosure belongs to the technical field of radar level meters, and particularly relates to a method and equipment for diagnosing and correcting a microwave channel of a radar level meter.
Background
The radar level gauge in the prior art does not have the capability of diagnosing the working state of the radar level gauge, and the working state of the radar level gauge affects the accuracy of the measurement thereof, for example, an abnormal microwave signal emitted by a radio frequency module, and an abnormal echo signal of a reflector caused by a blocked probe and an abnormal operation of the radar level gauge due to a change in the external environment may all cause an abnormal echo signal, thereby affecting the stability of the signal and the accuracy of the measurement. Therefore, an effective method for diagnosing the operating state of a radar level gauge is needed.
Disclosure of Invention
To address at least one of the above technical problems, the present disclosure provides a radar level gauge self-diagnosis method and apparatus.
According to an aspect of the present disclosure, there is provided a radar level gauge self-diagnosis method, comprising:
the radar level meter transmits microwave signals to the reflector;
receiving a reflector echo signal reflected by the reflector by the radar level gauge; and
generating operational state diagnostic information of the radar level gauge based on at least a signal characteristic of the reflector echo signal.
According to the self-diagnosis method of the radar level gauge according to at least one embodiment of the present disclosure, the reflector is a reflector formed by the structure of the radar level gauge itself or a reflector formed by the structure of the radar level gauge itself.
The radar level gauge self-diagnosis method according to at least one embodiment of the present disclosure, the signal characteristics comprising:
signal amplitude for identifying the intensity of the echo signal of the reflector, and/or
A distance for identifying a distance between the reflector and a radio frequency module of a radar level gauge receiving the reflector echo signal.
According to at least one embodiment of the present disclosure, a method of self-diagnosing a radar level gauge generating operational state diagnostic information of the radar level gauge based on at least signal characteristics of said reflector echo signal, comprises:
and comparing the reflector echo signal with a reflector preset signal to generate working state diagnosis information of the radar level gauge.
According to at least one embodiment of the present disclosure, the method for self-diagnosing a radar level gauge, which compares a reflector echo signal with a reflector preset signal to generate operating state diagnostic information of the radar level gauge, comprises:
when the signal amplitude of the reflector echo signal is lower than that of the reflector preset signal and is not zero, diagnosing that the signal drop of the radio frequency module is abnormal;
when the signal amplitude of the reflector echo signal is lower than that of the reflector preset signal and is zero, diagnosing that the radio frequency module does not work or the probe is abnormally blocked;
when the distance of the reflector echo signal is lower than the distance of a reflector preset signal or higher than the distance of the reflector preset signal, diagnosing that the distance related radio frequency module signal changes or the working environment of the radar level meter changes abnormally; and
and if the signal amplitude of the reflector echo signal is equal to the signal amplitude of the reflector preset signal, or the distance of the reflector echo signal is equal to the distance of the reflector preset signal, the radar level meter is diagnosed to work normally.
The radar level gauge self-diagnosis method according to at least one embodiment of the present disclosure, further comprising:
and generating an alarm signal when the generated working state diagnosis information of the radar level gauge is abnormal.
The radar level gauge self-diagnosis method according to at least one embodiment of the present disclosure, further comprising:
correcting the radar level gauge according to the working state diagnostic information, wherein the correcting the radar level gauge according to the working state diagnostic information comprises:
when the diagnosis state information is the signal drop of the radio frequency module, performing signal compensation; and
and when the diagnosis state information is that the distance-related radio frequency module signal is reduced, performing distance compensation.
According to the radar level gauge self-diagnosis method of at least one embodiment of the present disclosure, said signal compensation comprises adjusting a microwave transmission gain and/or adjusting a microwave reception gain.
According to the radar level gauge self-diagnosis method of at least one embodiment of the present disclosure, the distance compensation comprises a linear compensation, the linear compensation comprises generating a compensation for a reflector echo signal according to a difference value between a distance of the reflector echo signal and a distance of the reflector preset signal, and generating a compensation for a liquid level echo signal based on the generated compensation for the reflected echo signal, such that the distances of the reflector echo signal before and after the compensation are proportional to the distance of the liquid level echo signal.
According to an aspect of the present disclosure, there is provided a radar level gauge comprising:
the transmitter at least transmits a microwave signal to a reflector, so that the reflector reflects the microwave signal to form a reflector echo signal;
a receiver that receives the reflector echo signal; and
and the diagnostor generates the working state diagnostic information of the radar level gauge at least through the reflector echo signal.
According to at least one embodiment of the present disclosure, the reflector is a reflector formed by the structure of the radar level gauge itself or a reflector formed by the structure of the radar level gauge itself.
According to at least one embodiment of the present disclosure, the radar level gauge itself is structured to form a reflector comprising:
the radar level gauge comprises a probe, a horn structure, a sealing cover, a radar level gauge, a connecting part of a plurality of sections of waveguides in the probe, a connecting part of a waveguide in the probe and the horn structure, the surface of an inner lens, a reducing in the waveguide structure, a reflecting surface arranged in the lens, a reflecting surface arranged in the horn antenna, the sealing cover of the radar level gauge, a reflecting surface on the inner surface of the sealing cover of the radar level gauge, and any one of mounting flanges of the radar level gauge.
According to at least one embodiment of the present disclosure, the reflector formed by the structure of the non-radar level gauge itself comprises:
a member incorporated in the waveguide, or a member suspended from the antenna or a mounting structure to which the antenna is fixed.
According to at least one embodiment of the present disclosure, the structure of the member comprises:
any one of a plate structure, a ring structure, a bar structure, and a cross structure.
According to at least one embodiment of the present disclosure, the member is metallic or non-metallic.
According to at least one embodiment of the present disclosure, the diagnostic generates operational state diagnostic information of the radar level gauge based at least on signal characteristics of the reflector echo signals.
According to at least one embodiment of the present disclosure, the signal characteristic comprises:
signal amplitude for identifying the echo signal intensity of the reflector, and/or
A distance for identifying a distance between the reflector and the emitter.
According to at least one embodiment of the present disclosure, the diagnostics compare at least the reflector echo signal with a reflector preset signal, generating operational state diagnostic information of the radar level gauge.
According to at least one embodiment of the present disclosure, the comparing the reflector echo signal with a reflector preset signal to generate an operating state diagnostic information of the radar level gauge comprises:
when the signal amplitude of the reflector echo signal is lower than that of the reflector preset signal and the signal amplitude of the emitter is not zero, diagnosing that the signal of the emitter is abnormally reduced;
when the signal amplitude of the reflector echo signal is lower than that of the reflector preset signal and is zero, diagnosing that the transmitter does not work or a probe of the radar level gauge is blocked abnormally;
when the distance of the reflector echo signal is lower than the distance of a reflector preset signal or higher than the distance of the reflector preset signal, diagnosing that the distance-related radio frequency module signal changes or the working environment of the radar level gauge changes abnormally; and
and if the signal amplitude of the reflector echo signal is equal to the signal amplitude of the reflector preset signal, or the distance of the reflector echo signal is equal to the distance of the reflector preset signal, the radar level meter is diagnosed to work normally.
According to at least one embodiment of the present disclosure, the diagnostics generate an alarm signal when the operational status diagnostics information of the radar level gauge is abnormal.
According to at least one embodiment of the present disclosure, the diagnostic further modifies the radar level gauge according to the operating condition diagnostic information, the modifying the radar level gauge according to the operating condition diagnostic information comprising:
when the diagnosis state information is the signal drop of the transmitter, performing signal compensation; and
and performing distance compensation when the diagnosis state information is that the transmitter signal related to the distance is reduced.
According to the radar level of at least one embodiment of the present disclosure, the signal compensation comprises adjusting a microwave transmission gain and/or adjusting a microwave reception gain.
According to at least one embodiment of the present disclosure, the distance compensation includes a linear compensation, the linear compensation includes generating a compensation for the reflector echo signal according to a difference value between a distance of the reflector echo signal and a distance of the reflector preset signal, and generating a compensation for the liquid level echo signal based on the generated compensation for the reflected echo signal such that distances of the reflector echo signal before and after the compensation are proportional to the distance of the liquid level echo signal.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
FIG. 1 is a flow chart schematic of a method of self-diagnosis of a radar level gauge according to an embodiment of the present disclosure.
FIG. 2 is a flow chart schematic of a method of self-diagnosis of a radar level gauge according to yet another embodiment of the present disclosure.
FIG. 3 is a flow chart schematic of a method of self-diagnosis of a radar level gauge according to yet another embodiment of the present disclosure.
FIG. 4 is a flow chart schematic of a method of self-diagnosis of a radar level gauge according to yet another embodiment of the present disclosure.
Fig. 5 is a schematic diagram of a distance compensation method and effects according to an embodiment of the present disclosure.
FIG. 6 is a schematic structural view of a radar level gauge according to an embodiment of the present disclosure.
FIG. 7 is a schematic structural view of a radar level gauge according to yet another embodiment of the present disclosure.
FIG. 8 is a schematic structural view of a radar level gauge according to an embodiment of the present disclosure.
Fig. 9 is a schematic cross-sectional structure view of a sealing material provided according to an embodiment of the present disclosure.
Fig. 10 is a schematic structural diagram of a microwave control processor provided according to an embodiment of the present disclosure.
Detailed Description
The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. Technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Unless otherwise indicated, the illustrated exemplary embodiments/examples are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Accordingly, unless otherwise indicated, features of the various embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concept of the present disclosure.
The use of cross-hatching and/or shading in the drawings is generally used to clarify the boundaries between adjacent components. As such, unless otherwise noted, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, proportion, commonality between the illustrated components and/or any other characteristic, attribute, property, etc., of a component. Further, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two processes described consecutively may be performed substantially simultaneously or in reverse order to that described. In addition, like reference numerals denote like parts.
When an element is referred to as being "on" or "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. For purposes of this disclosure, the term "connected" may refer to physically, electrically, etc., and may or may not have intermediate components.
For descriptive purposes, the present disclosure may use spatially relative terms such as "below … …," below … …, "" below … …, "" below, "" above … …, "" above, "" … …, "" higher, "and" side (e.g., "in the sidewall") to describe one component's relationship to another (other) component as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below … …" can encompass both an orientation of "above" and "below". Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising" and variations thereof are used in this specification, the presence of stated features, integers, steps, operations, elements, components and/or groups thereof are stated but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximate terms and not as degree terms, and as such, are used to interpret inherent deviations in measured values, calculated values, and/or provided values that would be recognized by one of ordinary skill in the art.
FIG. 1 is a schematic flow diagram of a method of self-diagnosis of a radar level gauge according to an embodiment of the present disclosure.
As shown in FIG. 1, a radar level gauge self-diagnosis method S100, comprising:
s102: the radar level meter transmits microwave signals to the reflector;
s104: the radar level meter receives a reflector echo signal reflected by a reflector; and the number of the first and second groups,
s106: and generating the working state information of the radar level gauge based on the signal characteristics of the reflector echo signal.
The reflector is a reflector formed by the structure of the radar level gauge or a reflector formed by the structure of the non-radar level gauge.
Wherein the signal characteristics include:
signal amplitude for identifying a reflector echo signal intensity value, and distance for identifying a distance between a reflector and a reflector echo signal.
FIG. 2 is a flow chart schematic of a method of self-diagnosis of a radar level gauge according to yet another embodiment of the present disclosure.
As shown in FIG. 2, a radar level gauge self-diagnosis method S200, comprising:
s202: the radar level meter transmits microwave signals to the reflector;
s204: the radar level meter receives a reflector echo signal reflected by a reflector;
s206: generating working state information of the radar level gauge based on signal characteristics of the reflector echo signals; and the number of the first and second groups,
s208: and comparing the reflector echo signal with a reflector preset signal to generate working state diagnosis information of the radar level gauge.
S102 corresponds to S202, S104 corresponds to S204, and S106 corresponds to S206.
The reflector preset signal is set before the radar level meter leaves a factory or temporarily when the radar level meter is used, when the reflector preset signal is set, the signal characteristic of the reflector preset signal is set, and the signal characteristic of the reflector preset signal comprises signal amplitude and distance. The signal amplitude of the reflector preset signal is the signal amplitude of a reflector echo signal generated by the reflector transmitting microwave to the transmitter under the normal working state of the radar level meter, and the distance of the reflector preset signal is the distance between the reflector echo signal generated by the reflector transmitting microwave to the transmitter and the reflector under the normal working state of the radar level meter.
And comparing the reflector echo signal with a reflector preset signal to generate working state diagnosis information of the radar level gauge, wherein the working state diagnosis information comprises the following working state diagnosis information when the signal amplitude or the distance of the reflector preset signal is respectively a numerical value:
when the signal amplitude of the reflector echo signal is lower than that of the reflector preset signal and is not zero, diagnosing that the signal drop of the radio frequency module is abnormal;
when the signal amplitude of the echo signal of the reflector is lower than that of the preset signal of the reflector and is zero, diagnosing that the radio frequency module does not work or the probe is abnormally blocked;
when the distance of the reflector echo signal is lower than the distance of the reflector preset signal or higher than the distance of the reflector preset signal, diagnosing that the distance related radio frequency module signal changes or the working environment of the radar level meter changes abnormally; and if the signal amplitude of the reflector echo signal is equal to the signal amplitude of the reflector preset signal, or the distance of the reflector echo signal is equal to the distance of the reflector preset signal, the radar level meter is diagnosed to work normally.
The method includes the steps of comparing a reflector echo signal with a reflector preset signal to generate working state diagnostic information of the radar level gauge, and further including the steps that when the signal amplitude and the distance of the reflector preset signal are respectively in a numerical range, for example, the signal amplitude of the reflector preset signal is [ A-low, A-high ], the A-low is smaller than the A-high, the A-low and the A-high are positive numbers and are not zero, the distance of the reflector preset signal is [ D-low, D-high ], the D-low is smaller than the D-high, the D-low and the D-high are positive numbers and are not zero:
when the signal amplitude of the reflector echo signal is lower than the minimum value A-low of the signal amplitude of the reflector preset signal and the signal amplitude of the reflector echo signal is not zero, diagnosing that the signal drop of the radio frequency module is abnormal;
when the signal amplitude of the reflector echo signal is lower than the minimum value A-low of the signal amplitude of the reflector preset signal and is zero, diagnosing that the radio frequency module does not work or the probe is abnormally blocked;
when the distance of the reflector echo signal is lower than the minimum value D-low of the distance of the reflector preset signal or higher than the maximum value D-high of the distance of the reflector preset signal, the abnormal change of the radio frequency module signal related to the distance or the change of the working environment of the radar level meter is diagnosed; and if the signal amplitude of the reflector echo signal falls within the signal amplitude range of the reflector preset signal, namely within [ A-low, A-high ], or the distance of the reflector echo signal falls within the distance of the reflector preset signal, namely within [ D-low, D-high ], the radar level gauge is diagnosed as working normally.
Wherein the working environment of the level gauge comprises the outside temperature.
FIG. 3 is a flow chart schematic of a method of self-diagnosis of a radar level gauge according to yet another embodiment of the present disclosure.
As shown in FIG. 3, a radar level gauge self-diagnosis method S300, comprising:
s302: the radar level meter transmits microwave signals to the reflector;
s304: the radar level meter receives a reflector echo signal reflected by a reflector;
s306: generating working state information of the radar level gauge based on signal characteristics of the reflector echo signals;
s308: comparing the reflector echo signal with a reflector preset signal to generate working state diagnosis information of the radar level meter; and the number of the first and second groups,
s310: and generating an alarm signal when the generated working state diagnosis information of the radar level gauge is abnormal.
Wherein, S310: when the working state diagnosis information of the radar level gauge is abnormal, an alarm signal is generated, and the method comprises the following steps:
when the radio frequency module signal is diagnosed to be abnormally reduced, alarming is carried out;
when the radio frequency module does not work or the probe is abnormally blocked in the diagnosis, alarming; and alarming when the distance related radio frequency module signal changes or the working environment of the radar level meter changes abnormally.
S302 corresponds to S102, S304 corresponds to S104, S306 corresponds to S106, and S308 corresponds to S208.
FIG. 4 is a flow chart schematic of a method of self-diagnosis of a radar level gauge according to yet another embodiment of the present disclosure.
As shown in FIG. 4, the radar level gauge self-diagnosis method S400 comprises:
s402: the radar level meter transmits microwave signals to the reflector;
s404: the radar level meter receives a reflector echo signal reflected by a reflector;
s406: generating working state information of the radar level gauge based on signal characteristics of the reflector echo signals;
s408: comparing the reflector echo signal with a reflector preset signal to generate working state diagnosis information of the radar level meter; and the number of the first and second groups,
s412: correcting the radar level gauge according to the working state diagnostic information, wherein the correcting the radar level gauge according to the working state diagnostic information comprises:
when the diagnosis state information is that the radar radio frequency module signal is decreased, signal compensation is carried out; and when the diagnosis state information is that the distance-related radar radio frequency module signal is decreased, performing distance compensation.
S402 corresponds to S102, S404 corresponds to S104, S406 corresponds to S106, and S408 corresponds to S208.
Wherein the signal compensation comprises adjusting a microwave transmission or reception gain.
The distance compensation comprises linear compensation, the linear compensation means that the reflected echo is compensated according to the difference value between the distance of the echo and the distance of a preset echo, the liquid level echo is compensated according to the same proportion of the compensation of the reflected echo, and the echo distance of a reflector before and after compensation is in direct proportion to the echo distance of the liquid level echo.
When the generated working state diagnosis information of the radar level gauge is abnormal, the radar level gauge can also give an alarm while being corrected, and the method comprises the following steps:
when the diagnosis state information is that the radar radio frequency module signal is reduced, performing signal compensation and simultaneously generating an alarm signal; and when the diagnosis state information is that the distance-related radar radio frequency module signal is reduced, performing distance compensation and simultaneously generating an alarm signal.
Fig. 5 is a schematic diagram illustrating a distance compensation method and effects provided by the embodiment of the disclosure.
As shown in fig. 5, the linear compensation compensates the reflected echo according to the difference between the distance of the echo and the distance of the preset echo, compensates the liquid level echo according to the same proportion as that of the reflected echo, and the echo distance of the reflector before and after compensation is proportional to the liquid level echo distance. The echo distance of the reflector before compensation is C0, the echo distance of the liquid level before compensation is D0, the echo distance of the reflector after compensation is C1, and the echo distance of the liquid level after compensation is D1, D0 is D1 × C0/C1.
FIG. 6 is a schematic structural view of a radar level gauge provided by an embodiment of the present disclosure.
As shown in FIG. 6, the radar level gauge 1000 comprises:
a transmitter 1002 for causing the radar level gauge to transmit a microwave signal;
a reflector 1004 for reflecting the microwave signal emitted by the radar level gauge and forming a reflector echo signal;
a receiver 1008 for causing the radar level gauge to receive a reflector echo signal; and the number of the first and second groups,
a diagnostics 1006 for diagnosing an operational state of the radar level gauge from the reflector echo signal.
Wherein, the transmitter 1002 and the receiver 1008 realize transmitting or receiving microwave signals through a radio frequency module (radio frequency module or radio frequency module device) of the radar level gauge.
The diagnostic device 1006 diagnoses the operating state of the radar level gauge by being disposed on the chip/circuit board. The diagnostics 1006 comprises a signal comparison circuit which generates a diagnostic signal reflecting an operating state of the radar level gauge by comparing the reflector echo signal with a preset reflector echo signal.
Wherein the reflector 1004 is a reflector formed by the structure of the radar level gauge itself.
The reflector formed by the structure of the radar level meter comprises any one of a joint of a plurality of sections of waveguides inside the probe, a joint of the waveguides inside the probe and a horn structure, the surface of an inner lens, the diameter change of the waveguide structure, a reflecting surface arranged in the lens, a reflecting surface arranged in a horn antenna, a sealing cover of the radar level meter, a reflecting surface on the inner surface of the sealing cover of the radar level meter and a mounting flange of the radar level meter.
According to the radar level gauge according to at least one embodiment of the present disclosure, the diagnostics 1006 generates a diagnostic signal indicative of an operating state of the radar level gauge based on signal characteristics of the reflector echo signal.
According to the radar level gauge of at least one embodiment of the present disclosure, the signal characteristics may comprise:
a signal amplitude for identifying a reflector echo signal intensity value, and a distance for identifying a distance between the reflector and the reflector echo signal.
In accordance with the radar level gauge according to at least one embodiment of the present disclosure, the diagnostics 1006 preferably compare the reflector echo signal with a reflector preset echo signal, generating a diagnostic signal indicative of diagnostic information of an operating state of the radar level gauge.
The reflector preset signal is set before the radar level meter leaves a factory or temporarily when the radar level meter is used, when the reflector preset signal is set, the signal characteristic of the reflector preset signal is set, and the signal characteristic of the reflector preset signal comprises signal amplitude and distance. The signal amplitude of the reflector preset signal is the signal amplitude of a reflector echo signal generated by the reflector transmitting microwave to the transmitter under the normal working state of the radar level meter, and the distance of the reflector preset signal is the distance between the reflector echo signal generated by the reflector transmitting microwave to the transmitter and the reflector under the normal working state of the radar level meter.
And comparing the reflector echo signal with a reflector preset signal to generate working state diagnosis information of the radar level gauge, wherein the working state diagnosis information comprises the following working state diagnosis information when the signal amplitude or the distance of the reflector preset signal is respectively a numerical value:
when the signal amplitude of the reflector echo signal is lower than that of the reflector preset signal and is not zero, diagnosing that the signal drop of the radio frequency module is abnormal;
when the signal amplitude of the echo signal of the reflector is lower than that of the preset signal of the reflector and is zero, diagnosing that the radio frequency module does not work or the probe is abnormally blocked;
when the distance of the reflector echo signal is lower than the distance of the reflector preset signal or higher than the distance of the reflector preset signal, diagnosing that the distance related radio frequency module signal changes or the working environment of the radar level meter changes abnormally; and the number of the first and second groups,
and if the signal amplitude of the reflector echo signal is equal to the signal amplitude of the reflector preset signal, or the distance of the reflector echo signal is equal to the distance of the reflector preset signal, the radar level meter is diagnosed to work normally.
The method includes the steps of comparing a reflector echo signal with a reflector preset signal to generate working state diagnostic information of the radar level gauge, and further including the steps that when the signal amplitude and the distance of the reflector preset signal are respectively in a numerical range, for example, the signal amplitude of the reflector preset signal is [ A-low, A-high ], the A-low is smaller than the A-high, the A-low and the A-high are positive numbers and are not zero, the distance of the reflector preset signal is [ D-low, D-high ], the D-low is smaller than the D-high, the D-low and the D-high are positive numbers and are not zero:
when the signal amplitude of the reflector echo signal is lower than the minimum value A-low of the signal amplitude of the reflector preset signal and the signal amplitude of the reflector echo signal is not zero, diagnosing that the signal drop of the radio frequency module is abnormal;
when the signal amplitude of the reflector echo signal is lower than the minimum value A-low of the signal amplitude of the reflector preset signal and is zero, diagnosing that the radio frequency module does not work or the probe is abnormally blocked;
when the distance of the reflector echo signal is lower than the minimum value D-low of the distance of the reflector preset signal or higher than the maximum value D-high of the distance of the reflector preset signal, the abnormal change of the radio frequency module signal related to the distance or the change of the working environment of the radar level meter is diagnosed; and the number of the first and second groups,
if the signal amplitude of the echo signal of the reflector falls within the signal amplitude range of the preset signal of the reflector, i.e. within [ A-low, A-high ], or the distance of the echo signal of the reflector falls within the distance of the preset signal of the reflector, i.e. within [ D-low, D-high ], then the radar level gauge is diagnosed as operating normally.
Wherein the radio frequency module is arranged in the probe structure.
According to the radar level gauge according to at least one embodiment of the present disclosure, the diagnostics 1006 further generates an alarm signal when generating the operational state diagnostic information of the radar level gauge is abnormal.
Wherein, when the generated working state diagnosis information of the radar level gauge is abnormal, an alarm signal is generated, and the method comprises the following steps:
when the radio frequency module signal is diagnosed to be abnormally reduced, alarming is carried out;
when the radio frequency module does not work or the probe is abnormally blocked in the diagnosis, alarming; and alarming when the distance related radio frequency module signal changes or the working environment of the radar level meter changes abnormally.
According to the radar level gauge of at least one embodiment of the present disclosure, the diagnostic device 1006 modifies the radar level gauge according to the operating state diagnostic information, the modifying the radar level gauge according to the operating state diagnostic information comprising:
when the diagnosis state information is that the radar radio frequency module signal is decreased, signal compensation is carried out; and when the diagnosis state information is that the distance-related radar radio frequency module signal is decreased, performing distance compensation.
According to a preferred embodiment of the present disclosure, the diagnostics 1006 comprise a compensation circuit that generates the correction signal based on the diagnostic signal generated by the signal comparison circuit described above.
When the generated working state diagnosis information of the radar level gauge is abnormal, the radar level gauge can also give an alarm while being corrected, and the method comprises the following steps:
when the diagnosis state information is that the radar radio frequency module signal is reduced, performing signal compensation and simultaneously generating an alarm signal; and the number of the first and second groups,
and when the diagnosis state information is that the distance-related radar radio frequency module signal is reduced, performing distance compensation and simultaneously generating an alarm signal.
According to the radar level gauge of at least one embodiment of the present disclosure, the signal compensation comprises adjusting a microwave transmission or reception gain.
According to at least one embodiment of the present disclosure, the distance compensation includes a linear compensation that compensates for the reflected echo according to a difference between a distance of the echo and a distance of a preset echo, compensates for the liquid level echo in the same proportion as the reflected echo compensation, and the echo distance of the reflector before and after the compensation is proportional to the liquid level echo distance.
FIG. 7 is a schematic structural view of a radar level gauge provided by an embodiment of the present disclosure.
As shown in FIG. 7, the radar level gauge 2000 comprises:
a transmitter 2002 for causing the radar level gauge to transmit a microwave signal;
a receiver 2008 for causing the radar level gauge to receive a reflector echo signal; and the number of the first and second groups,
and a diagnostician 2006 for diagnosing an operational state of the radar level gauge from the reflector echo signal.
The transmitter 2002 and the receiver 2008 are configured to transmit or receive microwave signals via a radio frequency module (radio frequency module or radio frequency module device) of the radar level gauge.
The diagnoser 2006 diagnoses the working state of the radar level gauge through a chip/circuit board.
The reflector formed by the structure of the non-radar level gauge comprises a member added into the waveguide and any one of the members hung on the antenna or a mounting structure fixed with the antenna.
The structure of the member comprises a plate-shaped structure, a ring-shaped structure, a strip-shaped structure and a cross structure.
Wherein, the component is made of metal or nonmetal.
According to the radar level gauge of at least one embodiment of the present disclosure, the diagnostics 2006 generate diagnostic signals indicative of an operating state of the radar level gauge 2000 based on signal characteristics of the reflector echo signals.
According to at least one embodiment of the present disclosure, the signal characteristics comprise:
signal amplitude for identifying a reflector echo signal intensity value, and distance for identifying a distance between a reflector and a reflector echo signal.
According to the radar level gauge of at least one embodiment of the present disclosure, the diagnostics 2006 compares the reflector echo signal with a reflector preset signal, generating a diagnostic signal indicative of diagnostic information of an operating state of the radar level gauge.
The reflector preset signal is set before the radar level meter leaves a factory or temporarily when the radar level meter is used, when the reflector preset signal is set, the signal characteristic of the reflector preset signal is set, and the signal characteristic of the reflector preset signal comprises signal amplitude and distance. The signal amplitude of the reflector preset signal is the signal amplitude of a reflector echo signal generated by the reflector transmitting microwave to the transmitter under the normal working state of the radar level meter, and the distance of the reflector preset signal is the distance between the reflector echo signal generated by the reflector transmitting microwave to the transmitter and the reflector under the normal working state of the radar level meter.
And comparing the reflector echo signal with a reflector preset signal to generate working state diagnosis information of the radar level gauge, wherein the working state diagnosis information comprises the following working state diagnosis information when the signal amplitude or the distance of the reflector preset signal is respectively a numerical value:
when the signal amplitude of the reflector echo signal is lower than that of the reflector preset signal and is not zero, diagnosing that the signal drop of the radio frequency module is abnormal;
when the signal amplitude of the echo signal of the reflector is lower than that of the preset signal of the reflector and is zero, diagnosing that the radio frequency module does not work or the probe is abnormally blocked;
when the distance of the reflector echo signal is lower than the distance of the reflector preset signal or higher than the distance of the reflector preset signal, diagnosing that the distance related radio frequency module signal changes or the working environment of the radar level meter changes abnormally; and the number of the first and second groups,
and if the signal amplitude of the reflector echo signal is equal to the signal amplitude of the reflector preset signal, or the distance of the reflector echo signal is equal to the distance of the reflector preset signal, the radar level meter is diagnosed to work normally.
The method includes the steps of comparing a reflector echo signal with a reflector preset signal to generate working state diagnostic information of the radar level gauge, and further including the steps that when the signal amplitude and the distance of the reflector preset signal are respectively in a numerical range, for example, the signal amplitude of the reflector preset signal is [ A-low, A-high ], the A-low is smaller than the A-high, the A-low and the A-high are positive numbers and are not zero, the distance of the reflector preset signal is [ D-low, D-high ], the D-low is smaller than the D-high, the D-low and the D-high are positive numbers and are not zero:
when the signal amplitude of the reflector echo signal is lower than the minimum value A-low of the signal amplitude of the reflector preset signal and the signal amplitude of the reflector echo signal is not zero, diagnosing that the signal drop of the radio frequency module is abnormal;
when the signal amplitude of the reflector echo signal is lower than the minimum value A-low of the signal amplitude of the reflector preset signal and is zero, diagnosing that the radio frequency module does not work or the probe is abnormally blocked;
when the distance of the reflector echo signal is lower than the minimum value D-low of the distance of the reflector preset signal or higher than the maximum value D-high of the distance of the reflector preset signal, the abnormal change of the radio frequency module signal related to the distance or the change of the working environment of the radar level meter is diagnosed; and the number of the first and second groups,
if the signal amplitude of the echo signal of the reflector falls within the signal amplitude range of the preset signal of the reflector, i.e. within [ A-low, A-high ], or the distance of the echo signal of the reflector falls within the distance of the preset signal of the reflector, i.e. within [ D-low, D-high ], then the radar level gauge is diagnosed as operating normally.
According to the radar level gauge of at least one embodiment of the present disclosure, the diagnoser 2006 generates an alarm signal when the operational state diagnostic information of the radar level gauge is abnormal.
According to the radar level gauge of at least one embodiment of the present disclosure, the diagnostic 2006 modifies the radar level gauge according to the operating state diagnostic information, the modifying the radar level gauge according to the operating state diagnostic information comprising:
when the diagnosis state information is that the radar radio frequency module signal is decreased, signal compensation is carried out; and the number of the first and second groups,
and when the diagnosis state information is that the distance-related radar radio frequency module signal is reduced, performing distance compensation.
According to the radar level gauge of at least one embodiment of the present disclosure, the signal compensation comprises adjusting a microwave transmission or reception gain.
According to at least one embodiment of the present disclosure, the distance compensation includes a linear compensation that compensates for the reflected echo according to a difference between a distance of the echo and a distance of a preset echo, compensates for the liquid level echo in the same proportion as the reflected echo compensation, and the echo distance of the reflector before and after the compensation is proportional to the liquid level echo distance.
FIG. 8 is a schematic view of a radar level gauge configuration provided by an embodiment of the present disclosure.
As shown in FIG. 8, the radar level gauge 100 comprises: the antenna comprises a chip/circuit board 101, a transceiver unit 102 (such as an antenna device), an energy collecting device 103, a waveguide 106, a shielding shell 104, a wave absorbing material 105, a sealing material 107, a horn structure 110, a first lens 111, a second lens 112, a first shell 109, a waveguide fixing device 108, a wave-transparent isolating part 113, a sealing cover 114 and an outer extension part 1141.
For the radar level gauge 100 of the various embodiments described above, the waveguide 106 preferably guides the microwave signals emitted by the transceiver unit 102, as well as the echo signals.
According to a preferred embodiment of the present disclosure, as shown in FIG. 8, the radar level gauge 100 further comprises an energy harvesting device 103, the energy harvesting device 103 being arranged between the waveguide 106 and the transceiver unit 102.
As shown in fig. 8, the energy harvesting device 103 is disposed at a first end of the waveguide 106.
Preferably, the second end of the waveguide 106 is provided with a horn structure 110.
The horn structure 110 is integrally formed with the waveguide 106 or is removably disposed.
The radar level gauge 100 according to the preferred embodiment of the present disclosure, further comprising a shielding housing 104, the microwave radio frequency device 1011, the signal processing device 1012, the signal control and communication device 1013, the power supply 1014 and the energy harvesting device 103 are arranged within the shielding housing 104, a part of the waveguide 106 is arranged within the shielding housing 104, and the waveguide 106 protrudes from within the shielding housing 104.
Preferably, a wave absorbing material 105 is disposed within the shielding shell 104.
As shown in fig. 8, the wave-absorbing material 105 is preferably arranged at the periphery of the waveguide 106 and on the bottom wall of the shielding shell 104.
Preferably, the shielding shell 104 is cylindrical in shape, including a circumferential wall and a bottom wall, which form a cylindrical shape.
The end of the shielding shell 104 not forming the bottom wall is fixedly connected with the chip/circuit board 101, thereby forming a shielding cavity.
For the radar level gauge 100 of the various embodiments described above, the connection of the shielding housing 104 to the waveguide 106 may be glued or may be welded or cast in one piece.
With the radar level gauge 100 of the various embodiments described above, the shielding shell 104 and the chip/circuit board 101 are fixed, which may be by screws or the like.
According to a preferred embodiment of the present disclosure, the radar level gauge 100 further comprises a wave-transparent barrier 113, the wave-transparent barrier 113 being arranged adjacent to the horn structure.
In the various embodiments described above, the waveguides 106 may be a multi-segment structure that is spliced together, and the multi-segment waveguides may have the same or different radial dimensions.
As shown in FIG. 8, according to a preferred embodiment of the present disclosure, a lens arrangement is provided in a position directly opposite to the wave-transparent barrier 113 of the radar level gauge 100.
As shown in fig. 8, a wave-transparent partition 113 is provided between the lens arrangement and the horn structure 110.
According to a preferred embodiment of the present disclosure, the lens device includes a first lens 111 and a second lens 112, the first lens 111 and the second lens 112 are both disposed opposite to the wave-transparent isolation portion 113, and the size of the first lens 111 is smaller than that of the second lens 112.
With the radar level gauge 100 of the various embodiments described above, it is preferred that the first housing 109 is further comprised, that the shielding housing 104 and a portion of the waveguide 106 extending out of the shielding housing 104 are arranged within the first housing 109, that the waveguide 106 extends out of the first housing 109, and that the space between the first housing 109 and the shielding housing 104 and the space between the first housing 109 and the waveguide 106 are potted.
With the radar level gauge 100 of the various embodiments described above, the first housing 109 comprises at least a circumferential wall and a bottom wall, the bottom wall of the first housing 109 being formed with a through hole from which the waveguide 106 protrudes.
Preferably, as shown in fig. 8, a sealing material 107 and a waveguide fixing device 108 are provided on the bottom wall of the first housing 109, the sealing material 107 being provided on the inside of the bottom wall of the first housing 109, and the waveguide fixing device 108 being provided on the outside of the bottom wall of the first housing 109.
Wherein the sealing material 107 may be an O-ring and the waveguide fixing device 108 may be a threaded nut structure.
For the radar level gauge 100 of the various embodiments described above, it is preferred that it further comprises a sealing cover 114, the wave-transparent partition 113 and the lens arrangement being arranged within the sealing cover 114.
Preferably, the first end of the sealing cover 114 is arc-shaped, and the second end of the sealing cover 114 is formed with an extension 1141, and the extension 1141 can be attached to the flange member.
The sealing cover 114 may be made of plastic or other wave-transparent sealing material, or may be made of a material having anti-corrosion properties, such as plastic material, e.g., PTFE or PFA.
The sealing cap 114 may also have process connection threads thereon. The outer extension of the sealing cap 114 may be integral with the surface of the flange member to provide an alternative process mounting configuration.
The lens device itself may also be configured as a seal with a seal structure between the process connection structure, as shown in fig. 8.
Fig. 9 is a schematic cross-sectional structure diagram of a sealing material provided in an embodiment of the present disclosure.
As shown in fig. 9, the cross-sectional structure of the sealing material 107 is shown.
Fig. 10 is a schematic structural diagram of a microwave control processor provided in the embodiments of the present disclosure.
As shown in fig. 10, the chip/circuit board 101 is provided with: a microwave radio frequency device 1011, a signal processing device 1012, a signal control and communication device 1013 and a power supply device 1014. The signal processing device 1012 is configured to implement processing of microwave signals, which may include filtering, AD sampling, FFT operation, echo analysis, echo processing, and radar level gauge operating state diagnosis; the signal control and communication device 1013 is used for controlling the microwave signals and communicating the radar level gauge with external devices, and the power supply 1014 is used for supplying power to the radar level gauge.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.
Claims (10)
1. A method of self-diagnosis of a radar level gauge, comprising:
the radar level meter transmits microwave signals to the reflector;
receiving a reflector echo signal reflected by the reflector by the radar level gauge; and
generating operational state diagnostic information of the radar level gauge based on at least a signal characteristic of the reflector echo signal.
2. The radar level gauge self-diagnostic method according to claim 1, wherein said reflector is a reflector formed by the structure of the radar level gauge itself or a reflector formed by the structure of the non-radar level gauge itself.
3. The radar level gauge self-diagnostic method according to claim 1, wherein said signal characteristics comprise:
signal amplitude for identifying the intensity of the echo signal of the reflector, and/or
A distance for identifying a distance between the reflector and a radio frequency module of a radar level gauge receiving the reflector echo signal.
4. The radar level gauge self-diagnosis method according to claim 1, wherein generating operational state diagnostic information of the radar level gauge based on at least signal characteristics of said reflector echo signals comprises:
and comparing the reflector echo signal with a reflector preset signal to generate working state diagnosis information of the radar level gauge.
5. The radar level gauge self-diagnosis method according to claim 4, wherein said comparing the reflector echo signal with a reflector preset signal to generate operational state diagnostic information of the radar level gauge comprises:
when the signal amplitude of the reflector echo signal is lower than that of the reflector preset signal and is not zero, diagnosing that the signal drop of the radio frequency module is abnormal;
when the signal amplitude of the reflector echo signal is lower than that of the reflector preset signal and is zero, diagnosing that the radio frequency module does not work or the probe is abnormally blocked;
when the distance of the reflector echo signal is lower than the distance of a reflector preset signal or higher than the distance of the reflector preset signal, diagnosing that the distance related radio frequency module signal changes or the working environment of the radar level meter changes abnormally; and
and if the signal amplitude of the reflector echo signal is equal to the signal amplitude of the reflector preset signal, or the distance of the reflector echo signal is equal to the distance of the reflector preset signal, the radar level meter is diagnosed to work normally.
6. The radar level gauge self-diagnostic method according to claim 5, further comprising:
and generating an alarm signal when the generated working state diagnosis information of the radar level gauge is abnormal.
7. The radar level gauge self-diagnostic method according to claim 5, further comprising:
correcting the radar level gauge according to the working state diagnostic information, wherein the correcting the radar level gauge according to the working state diagnostic information comprises:
when the diagnosis state information is the signal drop of the radio frequency module, performing signal compensation; and
and when the diagnosis state information is that the distance-related radio frequency module signal is reduced, performing distance compensation.
8. The radar level gauge self-diagnostic method according to claim 7, wherein said signal compensation comprises adjusting a microwave transmission gain and/or adjusting a microwave reception gain.
9. The radar level gauge self-diagnosis method according to claim 7, wherein said distance compensation comprises a linear compensation comprising generating a compensation for a reflector echo signal based on a difference between a distance of said reflector echo signal and a distance of said reflector preset signal, and generating a compensation for a liquid level echo signal based on the generated compensation for the reflected echo signal such that the distance of the reflector echo signal before and after the compensation is proportional to the distance of the liquid level echo signal.
10. A radar level gauge, characterized in that it comprises:
the transmitter at least transmits a microwave signal to a reflector, so that the reflector reflects the microwave signal to form a reflector echo signal;
a receiver that receives the reflector echo signal; and
the diagnostor generates the working state diagnostic information of the radar level gauge at least through the reflector echo signal;
optionally, the reflector is a reflector formed by the self structure of the radar level gauge or a reflector formed by the self structure of the non-radar level gauge;
optionally, the reflector formed by the structure of the radar level gauge itself comprises:
the radar level gauge comprises a probe, a horn structure, a sealing cover, a radar level gauge, a connecting part of a plurality of sections of waveguides in the probe, a connecting part of a waveguide in the probe and the horn structure, the surface of an inner lens, a reducing in the waveguide structure, a reflecting surface arranged in the lens, a reflecting surface arranged in the horn antenna, the sealing cover of the radar level gauge, a reflecting surface on the inner surface of the sealing cover of the radar level gauge, and any one of an installation flange of the radar level gauge;
optionally, the reflector formed by the non-radar level gauge structure itself comprises:
any one of a member added to the waveguide and a member hung on the antenna or a mounting structure where the antenna is fixed;
optionally, the structure of the member comprises:
any one of a plate-shaped structure, a ring-shaped structure, a strip-shaped structure and a cross structure;
optionally, the member is made of a metal material or a non-metal material;
optionally, the diagnostic means generates operational state diagnostic information of the radar level gauge based at least on signal characteristics of the reflector echo signal;
optionally, the signal features include:
signal amplitude for identifying the echo signal intensity of the reflector, and/or
A distance for identifying a distance between the reflector and the emitter;
optionally, the diagnostic device compares at least the reflector echo signal with a reflector preset signal to generate working state diagnostic information of the radar level gauge;
optionally, the comparing the reflector echo signal with a reflector preset signal to generate the operating state diagnostic information of the radar level gauge includes:
when the signal amplitude of the reflector echo signal is lower than that of the reflector preset signal and the signal amplitude of the emitter is not zero, diagnosing that the signal of the emitter is abnormally reduced;
when the signal amplitude of the reflector echo signal is lower than that of the reflector preset signal and is zero, diagnosing that the transmitter does not work or a probe of the radar level gauge is blocked abnormally;
when the distance of the reflector echo signal is lower than the distance of a reflector preset signal or higher than the distance of the reflector preset signal, diagnosing that the distance-related radio frequency module signal changes or the working environment of the radar level gauge changes abnormally; and
if the signal amplitude of the reflector echo signal is equal to the signal amplitude of the reflector preset signal or the distance of the reflector echo signal is equal to the distance of the reflector preset signal, the radar level meter is diagnosed to work normally;
optionally, the diagnostic device generates an alarm signal when generating the operating state diagnostic information of the radar level gauge is abnormal;
optionally, the diagnostic further modifies the radar level gauge according to the operating condition diagnostic information, the modifying the radar level gauge according to the operating condition diagnostic information comprising:
when the diagnosis state information is the signal drop of the transmitter, performing signal compensation; and
performing distance compensation when the diagnostic status information is a distance-related transmitter signal drop;
optionally, the signal compensation comprises adjusting a microwave transmission gain and/or adjusting a microwave reception gain;
optionally, the distance compensation includes linear compensation, the linear compensation includes generating compensation for the reflector echo signal according to a difference between a distance of the reflector echo signal and a distance of the reflector preset signal, and generating compensation for the liquid level echo signal based on the generated compensation for the reflected echo signal, so that the distance of the reflector echo signal before and after the compensation is proportional to the distance of the liquid level echo signal.
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Application publication date: 20210813 |