CN118209183B - Wireless radar level gauge - Google Patents
Wireless radar level gauge Download PDFInfo
- Publication number
- CN118209183B CN118209183B CN202410640210.0A CN202410640210A CN118209183B CN 118209183 B CN118209183 B CN 118209183B CN 202410640210 A CN202410640210 A CN 202410640210A CN 118209183 B CN118209183 B CN 118209183B
- Authority
- CN
- China
- Prior art keywords
- radar
- signal
- level gauge
- wireless
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- 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
- G01F23/80—Arrangements for signal processing
-
- 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
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention relates to the technical field of intelligent monitoring of a wireless radar level meter, and discloses a wireless radar level meter which comprises a power supply module for supplying power to the wireless radar level meter, a radar sensing module for sending and acquiring the level distance in real time, a communication interface module for remote communication, a data processing module for processing a level distance signal, an algorithm control module for monitoring the level distance, and a fault processing module for detecting the fault of the level meter.
Description
Technical Field
The invention relates to the technical field of intelligent monitoring of wireless radar level meters, and discloses a wireless radar level meter.
Background
Radar level gauges are widely used sensor technology for measuring the level of materials or the height of solid materials in storage tanks, containers and the like. The existing liquid level and material level measurement mostly obtains liquid level data by measuring pressure and then calculating according to liquid density, and the installation of the liquid level and material level measuring pressure sensor generally adopts two modes of bottom opening and investment, and the two installation modes are required to be contacted with a measured medium. Radar level gauges are also common in the market at present, but most of the radar level gauges are output in a wired analog signal or wired digital signal mode.
The existing differential pressure liquid level measuring mode needs to be in direct contact with a medium, the problem of inconvenient installation exists, a plurality of measuring mediums are corrosive, and a differential pressure measuring sealing surface is at risk of leakage. In addition, the measurement of the solid level cannot be realized by measuring the pressure. Most of the existing radar liquid level meters adopt wired transmission, and the problems of high laying labor cost, long construction period and the like exist when wired power supply and wired signal transmission are used in the storage tank position comparison and dispersion occasion.
For example, the prior art chinese patent with grant publication number CN111380593B discloses a radar level gauge comprising: a housing; the antenna assembly is provided with an antenna assembly receiving and transmitting surface along any direction within a vertical plus or minus 45 DEG range, and the microwave receiving and transmitting direction of the receiving and transmitting surface is perpendicular to the receiving and transmitting surface; the reflecting plate, antenna module and reflecting plate all set up in the shell, and the reflecting surface of reflecting plate sets up with antenna module's receiving and dispatching face is relative, and the reflecting surface is used for the microwave vertical reflection to the liquid level of antenna module transmission and the microwave reflection to receiving and dispatching face with the liquid level reflection. The receiving and transmitting surface of the antenna assembly of the radar level gauge is arranged in any direction within the range of positive and negative 45 degrees in the vertical direction, so that the liquid water condensed by the vapor after liquid evaporation on the receiving and transmitting surface of the antenna assembly can smoothly flow down along the receiving and transmitting surface due to large vertical inclination angle of the receiving and transmitting surface, and can not gather on the receiving and transmitting surface, thereby not affecting the receiving of microwaves by the receiving and transmitting surface, ensuring the microwave receiving intensity and effectively solving the adverse effect of condensed water on liquid level measurement.
But there are in the above patents: only elucidated the radar level gauge commonly used on the market, lack communication module, lead to the staff unable to know the parameter condition that the level gauge gathered directly perceivedly, the intelligent degree is not enough to lead to the application scene limited, the device has only guaranteed electromagnetic wave emission intensity, and not set up signal processing unit and lead to signal error great, lack remote monitoring module, the staff can't know the data condition that the level gauge gathered in real time like this, leads to the data deviation great.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.
In order to solve the above technical problems, a main object of the present invention is to provide a wireless radar level gauge, comprising:
The power supply module is used for supplying power to the wireless radar level gauge;
The power supply module comprises a power supply unit for supplying power to the wireless radar level gauge so as to ensure that the wireless radar level gauge works normally;
the power supply unit adopts a high power supply voltage method, and meets the rated voltage value of the instrument when the power supply voltage is improved;
the radar sensing module is used for sending and acquiring the material level distance signal in real time;
The radar sensing module comprises a microwave transmitting unit, a microwave receiving unit, an air filtering unit, a limit switch unit and an automatic control unit;
the microwave transmitting unit is used for transmitting wide beam lines, and if the radar beam width covers the surface of the material, the material level measurement corresponding to the wide beam line array is strong scattering point detection and strong scattering point effective point detection;
The strong scattering point detection detects echo signals in a detected scene through the inclined distance, the angle and the amplitude, and the wide beam line classifies the strong scattering points of the detected scene through the position attribute of the strong scattering point in the scene and the relation with the size of the detected scene;
The strong scattering point effective point detection detects echo signals of a detected scene through a detected scene structure, a wide beam line reflection angle and an amplitude value, if the detected scene structure, the wide beam line reflection angle and the wide beam line reflection amplitude value are simultaneously estimated, the strong scattering point effective point is obtained, and if the detected scene structure, the wide beam line reflection angle and the wide beam line reflection amplitude value are not simultaneously estimated, the interference point is obtained;
The air filtering unit comprises an air filter, a pressure reducing valve and an oil mist separator;
The limit switch unit is used for controlling the movement of the radar level gauge and remotely transmitting the movement position of the radar level gauge to the data processing module;
the automatic control unit comprises an execution unit, a detection unit and a control unit;
the execution unit consists of a pneumatic single-cylinder double-acting knife gate valve, an electromagnetic valve, a limit switch and a filter, and is used for receiving and executing control instructions and finally feeding back to the control unit;
the detection unit is used for detecting pressure, temperature and flow and feeding back the pressure, temperature and flow to the control unit;
the control unit is used for outputting the control instruction, and the control instruction is used for controlling the radar level gauge to move;
and receiving detection results of the strong scattering point detection and the strong scattering point effective point detection through a microwave receiving unit.
The transmit wide beam line receive reflected echo expression is as follows:
Wherein, In order to reflect the energy of the return wave,As a function of the energy decay factor,In order to transmit a wide beam line power,For the reflected energy gain of the measured object,For a wide beam line transmission efficiency of the transmission,For the receiving efficiency of the emitted wide beam line, L is the linear distance between the antenna and the measured object;
If the horizontal distance between the emitted conical electromagnetic wave and the radar level gauge is smaller than the width of the measured scene, obtaining the linear distance between the antenna and the strong scattering point of the measured object through the electromagnetic wave reflected by the surface of the measured object, wherein the linear distance is an effective distance;
if the horizontal distance of the emitted conical electromagnetic wave is equal to the width of the measured scene, the maximum distance between scattering points formed by direct reflection of the electromagnetic wave by the side wall of the measured scene or the material hanging wall on the side wall is the distance between the scattering points;
the communication interface module is used for connecting the Bluetooth and the remote client and adjusting the parameter configuration of the transmitter;
the data processing module is used for processing the material level distance signals acquired by the radar sensing module;
The algorithm control module is used for monitoring a material level monitoring model of the collected material level distance signal;
and the fault processing module is used for detecting the radar level gauge and alarming the radar level gauge to be faulty.
As a preferred embodiment of the wireless radar level gauge according to the present invention, wherein:
the communication interface module comprises a wireless 4G unit and a Bluetooth communication interface unit;
The wireless 4G unit receives and transmits data with the data processing module, the algorithm control module and the fault processing module through UART interfaces, and data interconnection with the server is completed;
the Bluetooth communication interface unit is connected with external Bluetooth equipment, is connected with APP communication through the Bluetooth equipment and is used for transmitting the parameter configuration of the transmitter.
As a preferred embodiment of the wireless radar level gauge according to the present invention, wherein:
filtering and noise reduction processing is carried out on the radar signals transmitted by the wireless 4G unit through the data processing module;
The radar level gauge receives electromagnetic waves reflected by a measured target in a measured scene, and the electromagnetic waves are sampled by a sampling circuit in a signal acquisition box to obtain radar signals;
filtering the environmental interference received in the radar signal transmission process;
the noise reduction ratio of the radar signal is reduced through noise reduction, and the signal quality is improved.
As a preferred embodiment of the wireless radar level gauge according to the present invention, wherein:
the material level monitoring model takes radar signals processed by the data processing module as basic data, converts radar signal data into a floating point number type through feature extraction and feature sequence, captures the spatial features of a scene to be detected, converts the feature sequence into time sequence information, monitors the change trend of the radar signals according to radar signals acquired by the motion trail of the radar level meter, and establishes the material level monitoring model to identify, track and position a detected target detected by the radar level meter in real time;
And optimizing the material level monitoring model through a front-end model optimization algorithm.
As a preferred embodiment of the wireless radar level gauge according to the present invention, wherein:
The radar signal data are converted into floating point number types, namely, the radar signal is subjected to signal analysis to obtain an analysis signal, and the expression is as follows:
wherein n (t) is Gaussian white noise, x (t) is an analytic signal, A is amplitude, For the carrier frequency, T is the pulse width of the signal, rect () is a rectangular window function, c (T) is a phase function of time,The initial phase of the radar signal is represented by t, which is the time sequence;
The analytic signal is converted into a time domain form, and the expression is as follows:
Wherein, In order to resolve the time domain form of the converted signal, t is the time sequence,In order to be a frequency of the light,Is a kernel function, which indicates that the analysis signal returned at the z position of the measured object bin is phase-inverted by v degrees after Hilbert transformation, v is the phase-inverted angle of the input analysis signal after Hilbert transformation, u is the original angle of the analysis signal of the input radar signal,Outputting radar signal phase rotations for radar signal modelsThe degree, + is the turning direction,Outputting radar signal conjugate value phase rotations for radar signal modelDegree, -is the flip direction;
The kernel function expression is as follows:
Wherein a and b are time domain adjustment coefficients, the shape of the kernel function is controlled by a and b, and the time domain distribution is discretized through CTFD time domain functions;
The radar signal model expression is as follows:
Wherein A is the amplitude of the vibration, For the carrier frequency, T is the pulse width of the signal, rect () is a rectangular window function, c (T) is a phase function of time,The initial phase of the radar signal is represented by t, which is the time sequence;
The time domain distribution image of the two-dimensional radar signal of the time domain distribution is adjusted to be a fixed value through a bilinear interpolation method;
Optimizing the adjusted image through a convolution denoising self-encoder, establishing a material level monitoring model based on the optimized image, and monitoring a measured target measured by a wireless radar material level meter in real time through the material level monitoring model, wherein the algorithm expression of the material level monitoring model is as follows:
wherein n is an integer, any integer is taken, A time-domain version of the resolved signal for the y-th set of radar level gauge motion position numbers,To resolve the time domain version correction value of the signal,In order to resolve the initial timing correction values of the signals,An initial frequency correction value for the input analytic signal;
The level monitoring data output by the level monitoring model algorithm is the minimum value of the analytic signal of the number of the motion position of the level meter of the group y radar, and the expression is as follows:
Wherein, Monitoring radar level gauge measurement values for a level monitoring model, y being the number of the motion positions of the level gauge of the y-th group, min () being a minimum function,Converting the analytic signal into a time domain form;
and optimizing and extracting effective information from the two-dimensional radar signal time domain distribution image through an encoder, and optimizing a material level monitoring model algorithm.
As a preferred embodiment of the wireless radar level gauge according to the present invention, wherein:
The fault processing module detects the quality of an air medium and the gas phase obstruction and absorption of a detected target radar electromagnetic wave through a sensor, and monitors the problems of overvoltage overload and short circuit breaking through a self-checking circuit in the radar level gauge;
and if the radar level gauge fails, early warning is carried out through the communication interface module.
A method of wireless radar level gauge measuring a level, comprising:
S1, a radar level gauge arrives at a measured scene and emits radar electromagnetic waves to a measured target;
s2, the measured target reflects radar electromagnetic waves, and the radar level gauge collects the reflected electromagnetic waves;
S3, converting the electromagnetic waves into time domain signals by carrying out signal preprocessing on the collected electromagnetic waves;
s4, building a material level monitoring model through a time domain signal to monitor measured target parameters measured by a radar material level meter in real time;
S5, optimizing the material level monitoring model;
S6, measuring the material level.
A computer readable storage medium having stored thereon a computer program which, when executed, implements a method of measuring a level of a wireless radar level gauge.
An electronic device, comprising: a memory for storing instructions;
And a processor for executing the instructions to cause the apparatus to perform a method for implementing a wireless radar level gauge to measure a level.
The invention has the beneficial effects that:
the invention adopts the non-contact radar level gauge, can avoid leakage risk caused by direct contact with the medium, can measure two mediums of liquid and solid at the same time, and has good stability, high measurement precision and maximum error of +/-2 mm. With the current sensor and wireless cellular communication technology becoming more mature, the volume of a hardware module is also becoming smaller and smaller, wireless 4G is adopted as signal transmission, and meanwhile, battery power is adopted, so that the labor cost caused by cable laying can be avoided, and the construction period is greatly shortened.
Based on the above, the lithium battery is adopted for power supply, and meanwhile, a low-power-consumption circuit and a software algorithm are adopted, so that the service life of the battery can reach more than 3 years. And a filtering algorithm is adopted for the material level measurement, so that measurement data jump caused by liquid level fluctuation is avoided. In addition, bluetooth communication is added, so that a user can conveniently perform operations such as data viewing, parameter configuration and the like on site in real time, and the site installation of equipment can be more convenient and concise.
The invention transmits the data to the server through the wireless cellular technology, so that a user can check the on-site storage tank level data through a mobile phone or a computer at any time and any place without looking at the site, and the maintenance cost is saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a system diagram of a wireless radar level gauge according to the present invention;
FIG. 2 is a flow chart of a wireless radar level gauge according to the present invention for measuring a measured target;
FIG. 3 is a circuit topology diagram of a wireless radar level gauge according to the present invention for measuring a target to be measured;
fig. 4 is an overall structure diagram of a wireless radar level gauge according to the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
As shown in fig. 1, a wireless radar level gauge, comprising:
The power supply module is used for supplying power to the wireless radar level gauge;
the power supply module comprises a power supply unit for supplying power to the wireless radar level gauge so as to ensure that the wireless radar level gauge works normally;
the power supply unit adopts a high power supply voltage method, and meets the rated voltage value of the instrument when improving the power supply voltage.
The lithium battery is used as a power supply of the whole equipment, and the processor monitors the electric quantity information of the battery when using the power output by the lithium battery. When the electric quantity of the battery is too low, alarm information is generated and pushed to the server, so that a user is reminded of timely replacing the battery.
After the system is powered, the internal program of the processor periodically collects high-precision radar level sensor data through the UART communication signal port. The high-precision radar level sensor irradiates the level surface by emitting electromagnetic waves and receives echoes, thereby analyzing and obtaining the distance from the level surface to the electromagnetic wave emission point.
The radar sensing module is used for sending and acquiring the material level distance signal in real time;
further, the radar sensing module comprises a microwave transmitting unit, a microwave receiving unit, an air filtering unit, a limit switch unit and an automatic control unit;
the microwave transmitting unit is used for transmitting wide beam lines, and if the radar beam width covers the surface of the material, the material level measurement corresponding to the wide beam line array is strong scattering point detection and strong scattering point effective point detection;
in the discrimination of the effective points in all the strong scattering points, a condition is necessarily established for the strong scattering points to be the effective points for material level measurement or the strong scattering points to be the interference points for material level measurement, and the structure of the measured scene is judged through the established condition.
The strong scattering point detection detects echo signals in a detected scene through the inclined distance, the angle and the amplitude, and the wide beam line classifies the strong scattering points of the detected scene through the position attribute of the strong scattering point in the scene and the relation with the size of the detected scene;
further, if the structure of the measured scene is judged, the rest strong scattering point sets contain strong scattering points and a small number of strong scattering point effective points, then most of the measured target surface is determined to be covered by the main conical electromagnetic wave, the measured effective points exist on the main conical electromagnetic wave measured target surface, and finally the angle is judged;
Further, after the structure of the measured scene is judged and the angle between the measured target and the radar level gauge is judged, the radar level gauge is positioned at the top of the measured scene, the emitted radar electromagnetic wave is opposite to the surface of the measured target, and the amplitude of the effective measurement point caused by the surface of the measured target is relatively large, so that the amplitude is judged before the distance is judged, and the weak target point is filtered.
In order to improve detection performance, strong scattering points detected in the multi-time array beat signals can be accumulated before judging the effective points, the effective points of the strong scattering points are detected, echo signals of a detected scene are detected through the detected scene structure, the wide beam line reflection angle and the amplitude, if the estimated detected scene structure, the wide beam line reflection angle and the wide beam line reflection amplitude are met, the effective points of the strong scattering points are obtained, and if the estimated detected scene structure, the wide beam line reflection angle and the wide beam line reflection amplitude are not met, the interference points are measured for the material level;
The air filtering unit comprises an air filter, a pressure reducing valve and an oil mist separator, and the air filter and the pressure reducing valve have the functions of filtering, lubricating, reducing pressure and stabilizing pressure, and ensure that an air source entering the air cylinder is clean and stable.
The limit switch unit is used for controlling the movement of the radar level gauge, and when the radar level gauge moves to a certain position set in advance, the radar level gauge automatically stops to prevent the continuous movement from exceeding a control range and damaging moving parts or other parts; the limit switch unit is also used for feeding back, automatically stopping when the movement of the radar level gauge reaches a set position, and remotely transmitting the movement position of the radar level gauge to the data processing module so as to remotely grasp whether the on-site movement part reaches a preset position.
The automatic control unit comprises an execution unit, a detection unit and a control unit;
the execution unit consists of a pneumatic single-cylinder double-acting knife gate valve, an electromagnetic valve, a limit switch and a filter, and is used for receiving and executing control instructions and finally feeding back to the control unit;
the detection unit is used for detecting pressure, temperature and flow and feeding back the pressure, temperature and flow to the control unit;
the control unit is used for outputting the control instruction, and the control instruction is used for controlling the radar level gauge to move;
and receiving detection results of the strong scattering point detection and the strong scattering point effective point detection through a microwave receiving unit.
Further, the transmit wide beam line receive reflected echo expression is as follows:
Wherein, In order to reflect the energy of the return wave,As a function of the energy decay factor,In order to transmit a wide beam line power,For the reflected energy gain of the measured object,For a wide beam line transmission efficiency of the transmission,For the receiving efficiency of the emitted wide beam line, L is the linear distance between the antenna and the measured object;
If the horizontal distance between the emitted conical electromagnetic wave and the radar level gauge is smaller than the width of the measured scene, obtaining the linear distance between the antenna and the strong scattering point of the measured object through the electromagnetic wave reflected by the surface of the measured object, wherein the linear distance is an effective distance;
If the horizontal distance of the emitted conical electromagnetic wave is equal to the width of the measured scene, the maximum distance between scattering points formed by direct reflection of the electromagnetic wave by the side wall of the measured scene or the material hanging wall on the side wall is the distance between the scattering points.
As shown in fig. 4, the communication interface module is used for connecting the bluetooth and the remote client and adjusting the parameter configuration of the transmitter;
the communication interface module comprises a wireless 4G unit and a Bluetooth communication interface unit;
The wireless 4G unit receives and transmits data with the data processing module, the algorithm control module and the fault processing module through UART interfaces, and data interconnection with the server is completed;
the Bluetooth communication interface unit is connected with external Bluetooth equipment, is connected with APP communication through the Bluetooth equipment and is used for transmitting the parameter configuration of the transmitter.
After the processor acquires the material level data, a material level surface fluctuation filtering algorithm is added in the material level sensor for filtering data jump caused by material surface fluctuation, so that more accurate and stable material level information is provided for a monitoring unit, and the material level sensor has the advantages of high precision, low power consumption, small volume and the like compared with the traditional radar sensor.
Meanwhile, a user can configure sensor parameters, network information, alarm threshold information and the like of the level meter through connection of a Bluetooth interface and a mobile phone APP.
The processor stores the filtered material level data at fixed time, establishes connection with the server through the 4G module according to the networking information configured by Bluetooth after the reporting time is reached, and transmits the stored data to the server in batches after establishing connection, so that a user can check the field material level information at any time and any place through a PC or a mobile phone.
The data processing module is used for processing the material level distance signals acquired by the radar sensor;
The data processing module is used for filtering and denoising radar signals transmitted by the wireless 4G unit;
The radar level gauge receives electromagnetic waves reflected by a measured target in a measured scene, and the electromagnetic waves are sampled by a sampling circuit in a signal acquisition box to obtain radar signals;
filtering the environmental interference received in the radar signal transmission process;
the noise reduction ratio of the radar signal is reduced through noise reduction, and the signal quality is improved.
The algorithm control module comprises a material level monitoring model for monitoring the collected material level distance signal;
The method comprises the steps that a level monitoring model takes radar signals processed by a data processing module as basic data, feature extraction is carried out to extract feature sequences, the radar signal data are converted into floating point number types, the spatial features of a scene to be detected are captured, the feature sequences are converted into time sequence information, the change trend of the radar signals is monitored according to radar signals acquired by a radar level meter motion track, and a level monitoring model is established to identify, track and position a detected target detected by the radar level meter in real time;
And optimizing the material level monitoring model through a front-end model optimization algorithm.
The radar signal data are converted into floating point number types, namely, the radar signal is subjected to signal analysis to obtain an analysis signal, and the expression is as follows:
wherein n (t) is Gaussian white noise, x (t) is an analytic signal, A is amplitude, For the carrier frequency, T is the pulse width of the signal, rect () is a rectangular window function, c (T) is a phase function of time,The initial phase of the radar signal is represented by t, which is the time sequence;
The analytic signal is converted into a time domain form, and the expression is as follows:
Wherein, In order to resolve the time domain form of the converted signal, t is the time sequence,In order to be a frequency of the light,Is a kernel function, which indicates that the analysis signal returned at the z position of the measured object bin is phase-inverted by v degrees after Hilbert transformation, v is the phase-inverted angle of the input analysis signal after Hilbert transformation, u is the original angle of the analysis signal of the input radar signal,Outputting radar signal phase rotations for radar signal modelsThe degree, + is the turning direction,Outputting radar signal conjugate value phase rotations for radar signal modelDegree, -is the flip direction;
The kernel function expression is as follows:
Wherein a and b are time domain adjustment coefficients, the shape of the kernel function is controlled by a and b, and the time domain distribution is discretized through CTFD time domain functions;
The radar signal model expression is as follows:
Wherein A is the amplitude of the vibration, For the carrier frequency, T is the pulse width of the signal, rect () is a rectangular window function, c (T) is a phase function of time,The initial phase of the radar signal is represented by t, which is the time sequence;
The time domain distribution image of the two-dimensional radar signal of the time domain distribution is adjusted to be a fixed value through a bilinear interpolation method;
Optimizing the adjusted image through a convolution denoising self-encoder, establishing a material level monitoring model based on the optimized image, and monitoring a measured target measured by a wireless radar material level meter in real time through the material level monitoring model, wherein the algorithm expression of the material level monitoring model is as follows:
wherein n is an integer, any integer is taken, A time-domain version of the resolved signal for the y-th set of radar level gauge motion position numbers,To resolve the time domain version correction value of the signal,In order to resolve the initial timing correction values of the signals,An initial frequency correction value for the input analytic signal;
The level monitoring data output by the level monitoring model algorithm is the minimum value of the analytic signal of the number of the motion position of the level meter of the group y radar, and the expression is as follows:
Wherein, Monitoring radar level gauge measurement values for a level monitoring model, y being the number of the motion positions of the level gauge of the y-th group, min () being a minimum function,Converting the analytic signal into a time domain form;
and optimizing and extracting effective information from the two-dimensional radar signal time domain distribution image through an encoder, and optimizing a material level monitoring model algorithm.
And the fault processing module is used for detecting the radar level gauge and alarming the radar level gauge to be faulty.
The fault processing module detects the quality of an air medium and the gas phase obstruction and absorption of a detected target radar electromagnetic wave through a sensor, and monitors the problems of overvoltage overload and short circuit breaking through a self-checking circuit in the radar level gauge;
and if the radar level gauge fails, early warning is carried out through the communication interface module.
Embodiment two:
As shown in fig. 2, a method for measuring a level by a wireless radar level gauge, comprising:
S1, a radar level gauge arrives at a measured scene and emits radar electromagnetic waves to a measured target;
s2, the measured target reflects radar electromagnetic waves, and the radar level gauge collects the reflected electromagnetic waves;
S3, converting the electromagnetic waves into time domain signals by carrying out signal preprocessing on the collected electromagnetic waves;
s4, building a material level monitoring model through a time domain signal to monitor measured target parameters measured by a radar material level meter in real time;
S5, optimizing the material level monitoring model;
S6, measuring the material level.
As shown in fig. 3, a wireless radar level gauge parameter is set;
The wireless radar level gauge adopts a direct current power supply mode;
U1 is MCU, selects low-power ARM processor STM32L071 or MSP432P401V of main stream in the market at present;
U2 is bluetooth module UART interface for external bluetooth module.
U3 is a 4G-CAT1 module EC800M, and compared with a CAT4 module, the module can realize lower power consumption;
U4 is a 3.6VDC lithium battery, the battery is a disposable battery, and the service life can reach 3 years;
The S1 ASR100 is an 80GHz high-frequency radar level sensor, can realize high-precision level measurement and generates UART signals.
Embodiment III:
in this embodiment, an electronic device is provided that includes a memory for storing instructions and a processor for executing the instructions, such that the device performs steps implementing a method of measuring a level of a wireless radar level gauge as described above.
Embodiment four:
A computer readable storage medium having stored thereon a computer program that is erasable;
The computer program, when run on a computer device, causes the computer device to carry out a method of measuring a level of a wireless radar level gauge as described above.
It is important to note that the construction and arrangement of the application as shown in the various exemplary embodiments is illustrative only. Although only two embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible, for example, variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc., without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of present application. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. Any means-plus-function clause is intended to cover the structures described herein as performing the function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present applications. Therefore, the application is not limited to the specific embodiments, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Furthermore, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those not associated with the best mode presently contemplated for carrying out the invention, or those not associated with practicing the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (9)
1.A wireless radar level gauge, comprising:
The power supply module is used for supplying power to the wireless radar level gauge;
The power supply module comprises a power supply unit for supplying power to the wireless radar level gauge so as to ensure that the wireless radar level gauge works normally;
the power supply unit adopts a high power supply voltage method, and meets the rated voltage value of the instrument when the power supply voltage is improved;
the radar sensing module is used for sending and acquiring the material level distance signal in real time;
The radar sensing module comprises a microwave transmitting unit, a microwave receiving unit, an air filtering unit, a limit switch unit and an automatic control unit;
the microwave transmitting unit is used for transmitting wide beam lines, and if the radar beam width covers the surface of the material, the material level measurement corresponding to the wide beam line array is strong scattering point detection and strong scattering point effective point detection;
The strong scattering point detection detects echo signals in a detected scene through the inclined distance, the angle and the amplitude, and the wide beam line classifies the strong scattering points of the detected scene through the position attribute of the strong scattering point in the scene and the relation with the size of the detected scene;
The strong scattering point effective point detection detects echo signals of a detected scene through a detected scene structure, a wide beam line reflection angle and an amplitude value, if the detected scene structure, the wide beam line reflection angle and the wide beam line reflection amplitude value are simultaneously estimated, the strong scattering point effective point is obtained, and if the detected scene structure, the wide beam line reflection angle and the wide beam line reflection amplitude value are not simultaneously estimated, the interference point is obtained;
The air filtering unit comprises an air filter, a pressure reducing valve and an oil mist separator;
The limit switch unit is used for controlling the movement of the radar level gauge and remotely transmitting the movement position of the radar level gauge to the data processing module;
the automatic control unit comprises an execution unit, a detection unit and a control unit;
the execution unit consists of a pneumatic single-cylinder double-acting knife gate valve, an electromagnetic valve, a limit switch and a filter, and is used for receiving and executing control instructions and finally feeding back to the control unit;
the detection unit is used for detecting pressure, temperature and flow and feeding back the pressure, temperature and flow to the control unit;
the control unit is used for outputting the control instruction, and the control instruction is used for controlling the radar level gauge to move;
Receiving detection results of the strong scattering point detection and the strong scattering point effective point detection through a microwave receiving unit;
The transmit wide beam line receive reflected echo expression is as follows:
；
Wherein, In order to reflect the energy of the return wave,As a function of the energy decay factor,In order to transmit a wide beam line power,For the reflected energy gain of the measured object,For a wide beam line transmission efficiency of the transmission,For the receiving efficiency of the emitted wide beam line, L is the linear distance between the antenna and the measured object;
If the horizontal distance between the emitted conical electromagnetic wave and the radar level gauge is smaller than the width of the measured scene, obtaining the linear distance between the antenna and the strong scattering point of the measured object through the electromagnetic wave reflected by the surface of the measured object, wherein the linear distance is an effective distance;
if the horizontal distance of the emitted conical electromagnetic wave is equal to the width of the measured scene, the maximum distance between scattering points formed by direct reflection of the electromagnetic wave by the side wall of the measured scene or the material hanging wall on the side wall is the distance between the scattering points;
the communication interface module is used for connecting the Bluetooth and the remote client and adjusting the parameter configuration of the transmitter;
the data processing module is used for processing the material level distance signals acquired by the radar sensing module;
The algorithm control module is used for monitoring a material level monitoring model of the collected material level distance signal;
and the fault processing module is used for detecting the radar level gauge and alarming the radar level gauge to be faulty.
2. A wireless radar level gauge according to claim 1, wherein:
the communication interface module comprises a wireless 4G unit and a Bluetooth communication interface unit;
The wireless 4G unit receives and transmits data with the data processing module, the algorithm control module and the fault processing module through UART interfaces, and data interconnection with the server is completed;
the Bluetooth communication interface unit is connected with external Bluetooth equipment, is connected with APP communication through the Bluetooth equipment and is used for transmitting the parameter configuration of the transmitter.
3. A wireless radar level gauge according to claim 2, wherein:
filtering and noise reduction processing is carried out on the radar signals transmitted by the wireless 4G unit through the data processing module;
The radar level gauge receives electromagnetic waves reflected by a measured target in a measured scene, and the electromagnetic waves are sampled by a sampling circuit in a signal acquisition box to obtain radar signals;
filtering the environmental interference received in the radar signal transmission process;
the noise reduction ratio of the radar signal is reduced through noise reduction, and the signal quality is improved.
4. A wireless radar level gauge according to claim 3, wherein:
the material level monitoring model takes radar signals processed by the data processing module as basic data, converts radar signal data into a floating point number type through feature extraction and feature sequence, captures the spatial features of a scene to be detected, converts the feature sequence into time sequence information, monitors the change trend of the radar signals according to radar signals acquired by the motion trail of the radar level meter, and establishes the material level monitoring model to identify, track and position a detected target detected by the radar level meter in real time;
And optimizing the material level monitoring model through a front-end model optimization algorithm.
5. A wireless radar level gauge according to claim 4, wherein:
The radar signal data are converted into floating point number types, namely, the radar signal is subjected to signal analysis to obtain an analysis signal, and the expression is as follows:
；
wherein n (t) is Gaussian white noise, x (t) is an analytic signal, A is amplitude, For the carrier frequency, T is the pulse width of the signal, rect () is a rectangular window function, c (T) is a phase function of time,The initial phase of the radar signal is represented by t, which is the time sequence;
The analytic signal is converted into a time domain form, and the expression is as follows:
；
Wherein, In order to resolve the time domain form of the converted signal, t is the time sequence,In order to be a frequency of the light,Is a kernel function, which indicates that the analysis signal returned at the z position of the measured object bin is phase-inverted by v degrees after Hilbert transformation, v is the phase-inverted angle of the input analysis signal after Hilbert transformation, u is the original angle of the analysis signal of the input radar signal,Outputting radar signal phase rotations for radar signal modelsThe degree, + is the turning direction,Outputting radar signal conjugate value phase rotations for radar signal modelDegree, -is the flip direction;
The kernel function expression is as follows:
；
Wherein a and b are time domain adjustment coefficients, the shape of the kernel function is controlled by a and b, and the time domain distribution is discretized through CTFD time domain functions;
The radar signal model expression is as follows:
；
Wherein A is the amplitude of the vibration, For the carrier frequency, T is the pulse width of the signal, rect () is a rectangular window function, c (T) is a phase function of time,The initial phase of the radar signal is represented by t, which is the time sequence;
The time domain distribution image of the two-dimensional radar signal of the time domain distribution is adjusted to be a fixed value through a bilinear interpolation method;
Optimizing the adjusted image through a convolution denoising self-encoder, establishing a material level monitoring model based on the optimized image, and monitoring a measured target measured by a wireless radar material level meter in real time through the material level monitoring model, wherein the algorithm expression of the material level monitoring model is as follows:
；
wherein n is an integer, any integer is taken, A time-domain version of the resolved signal for the y-th set of radar level gauge motion position numbers,To resolve the time domain version correction value of the signal,In order to resolve the initial timing correction values of the signals,An initial frequency correction value for the input analytic signal;
The level monitoring data output by the level monitoring model algorithm is the minimum value of the analytic signal of the number of the motion position of the level meter of the group y radar, and the expression is as follows:
；
Wherein, Monitoring radar level gauge measurement values for a level monitoring model, y being the number of the motion positions of the level gauge of the y-th group, min () being a minimum function,Converting the analytic signal into a time domain form;
and optimizing and extracting effective information from the two-dimensional radar signal time domain distribution image through an encoder, and optimizing a material level monitoring model algorithm.
6. A wireless radar level gauge according to claim 5, wherein:
The fault processing module detects the quality of an air medium and the gas phase obstruction and absorption of a detected target radar electromagnetic wave through a sensor, and monitors the problems of overvoltage overload and short circuit breaking through a self-checking circuit in the radar level gauge;
and if the radar level gauge fails, early warning is carried out through the communication interface module.
7. A method of measuring a level by a wireless radar level gauge according to any one of the claims 1-6, being implemented on the basis of a wireless radar level gauge, characterized in that: comprising the following steps:
S1, a radar level gauge arrives at a measured scene and emits radar electromagnetic waves to a measured target;
s2, the measured target reflects radar electromagnetic waves, and the radar level gauge collects the reflected electromagnetic waves;
S3, converting the electromagnetic waves into time domain signals by carrying out signal preprocessing on the collected electromagnetic waves;
s4, building a material level monitoring model through a time domain signal to monitor measured target parameters measured by a radar material level meter in real time;
S5, optimizing the material level monitoring model;
S6, measuring the material level.
8. A computer device, characterized by: comprising the following steps:
a memory for storing instructions;
a processor for executing the instructions, causing the device to perform a method of implementing a wireless radar level gauge measuring a level as claimed in claim 7.
9. A computer-readable storage medium having stored thereon a computer program, characterized by: the computer program, when executed, implements a method of measuring a level of a wireless radar level gauge as claimed in claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410640210.0A CN118209183B (en) | 2024-05-22 | 2024-05-22 | Wireless radar level gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410640210.0A CN118209183B (en) | 2024-05-22 | 2024-05-22 | Wireless radar level gauge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118209183A CN118209183A (en) | 2024-06-18 |
| CN118209183B true CN118209183B (en) | 2024-08-06 |
Family
ID=91450934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410640210.0A Active CN118209183B (en) | 2024-05-22 | 2024-05-22 | Wireless radar level gauge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118209183B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2306489Y (en) * | 1997-07-11 | 1999-02-03 | 北京超精细工程研究所 | Circular raster light guide measurer for anti-explosion liquid level |
| CN102809405A (en) * | 2011-05-27 | 2012-12-05 | Vega格里沙贝两合公司 | Method for detecting multiple echoes and bottom echoes |
| CN112534216A (en) * | 2018-08-02 | 2021-03-19 | Vega格里沙贝两合公司 | Radar sensor for object detection |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9903461D0 (en) * | 1999-02-17 | 1999-04-07 | Motherwell Control Systems Lim | Radar gauge |
| WO2004005959A1 (en) * | 2002-07-08 | 2004-01-15 | Saab Marine Electronics Ab | Level gauging system |
| CN201945891U (en) * | 2010-12-17 | 2011-08-24 | 上海无线电设备研究所 | Object level / liquid level monitoring system based on wireless sensor networks |
-
2024
- 2024-05-22 CN CN202410640210.0A patent/CN118209183B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2306489Y (en) * | 1997-07-11 | 1999-02-03 | 北京超精细工程研究所 | Circular raster light guide measurer for anti-explosion liquid level |
| CN102809405A (en) * | 2011-05-27 | 2012-12-05 | Vega格里沙贝两合公司 | Method for detecting multiple echoes and bottom echoes |
| CN112534216A (en) * | 2018-08-02 | 2021-03-19 | Vega格里沙贝两合公司 | Radar sensor for object detection |
Also Published As
| Publication number | Publication date |
|---|---|
| CN118209183A (en) | 2024-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102004077B (en) | Turbidity transducer | |
| KR102440355B1 (en) | Deep Learning Ocean Cluster Data Measurement System Using Sea Level Radio Reflectance | |
| CN105571644B (en) | A kind of insulator metallic dust filth on-Line Monitor Device and its monitoring method | |
| CN103792340A (en) | Salinized soil monitoring and early warning system and method based on Internet of Things | |
| CN112113636A (en) | An intelligent detection system and method for coal bunker material level based on frequency-modulated continuous wave radar | |
| CN113865712B (en) | JP regulator cubicle temperature monitoring system | |
| CN116953707A (en) | A tide level monitoring radar device and monitoring method and system | |
| CN118209183B (en) | Wireless radar level gauge | |
| CN111044019A (en) | Real-time measuring system and method for depth of underwater sludge | |
| CN118129864B (en) | Millimeter wave radar-based liquid level measurement method and system | |
| CN203323794U (en) | Wireless receiving and sending supersonic wave brine baume degree, evaporation capacity and liquid level measuring device | |
| CN104808261B (en) | Rainfall measurement sensor without mechanical structure | |
| CN107677609A (en) | A kind of sludge status real time monitor and warning system and method based on Internet of Things | |
| CN207216019U (en) | A kind of ocean shipping high-speed signal acquisition and compensation device | |
| CN215895001U (en) | Integrated multifunctional meteorological acquisition system | |
| CN113758714B (en) | Marine diesel engine fault diagnosis method | |
| CN205898247U (en) | Novel tidal level measuring device based on K wave band radar | |
| CN209342190U (en) | A kind of water quantity monitoring device | |
| CN212514867U (en) | A transmission line insulator pollution monitoring system | |
| US20230273060A1 (en) | Method for distributed determination of a fill level or limit level | |
| CN113965902A (en) | Intelligent waste mineral oil collecting terminal | |
| CN112835129A (en) | An integrated multifunctional meteorological collection system | |
| CN217501868U (en) | Floating wind power generation system | |
| CN111007226A (en) | Water quality on-line monitoring system based on machine vision | |
| CN111337075A (en) | Hydraulic engineering construction monitoring system based on ecological protection technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |