CN108195443B - Water level measuring method, system and equipment - Google Patents
Water level measuring method, system and equipment Download PDFInfo
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- 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
Abstract
The invention discloses a water level measuring method, which comprises the following steps: acquiring a time domain measurement curve set of a target water area, determining a spectrogram corresponding to each time domain measurement curve in the time domain measurement curve set according to the time domain measurement curve set, wherein the spectrogram is a corresponding relation between frequency components and amplitudes, each frequency component corresponds to one time domain measurement curve in a time domain, and judging whether a difference ratio of a first amplitude to a preset target amplitude in the spectrogram is smaller than a preset difference ratio threshold value or not; when the frequency component exists, the frequency component corresponding to the first amplitude is the target frequency component of the target water area; converting the target frequency component into a water level of the target water area. According to the method, the target frequency component corresponding to the target water area is preferentially determined, and the target frequency component is converted into the water level of the target water area, so that the problems that the radar water level gauge is easily influenced by a floater on the water surface, the distance from the probe to the floater is the measured result, and the measured result is inaccurate are solved.
Description
Technical Field
The invention relates to the field of water conservancy, in particular to a water level measuring method, system and equipment.
Background
The water level meter is used as important equipment for hydrologic information monitoring and flood control early warning, is widely applied to various water resource monitoring places and is used for monitoring the change of water levels of rivers, lakes, reservoirs, channels and the like. The commonly used water level gauge has multiple forms such as floater formula, radar and pressure type, wherein, radar water level gauge is a non-contact water level measuring instrument, adopts support cantilever mounting means, simple to operate, and measurement accuracy is high, and the interference killing feature is strong, and the scope of using is most extensive, transmits radar pulse through radar water level gauge sensing antenna, and the pulse that the antenna reception is followed the surface of water reflection and is back to record time, because electromagnetic wave propagation velocity is a constant, thereby reachs the water level of sensing antenna to the surface of water. .
The inventor is to current process based on radar water level gauge measurement water level study discovery, and radar water level gauge easily receives the influence of surface of water floater, and when the surface of water had the floater, the radar can think the floater into the surface of water by mistake, and the measuring result is the distance of probe to floater, and measuring result is inaccurate.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for measuring a water level, which are used to solve the problems in the prior art that a radar level gauge is susceptible to a floating object on a water surface, when the floating object exists on the water surface, the floating object is mistaken for the water surface by a radar, the measurement result is the distance from a probe to the floating object, and the measurement result is inaccurate, and the specific scheme is as follows:
a water level measuring method is applied to a water level measuring device and comprises the following steps:
acquiring a time domain measurement curve set corresponding to a target water area, wherein the time domain measurement curve set comprises the target water area and time domain measurement curves of all objects in the target water area;
performing fast Fourier transform on each time domain measurement curve in the time domain measurement curve set to obtain a spectrogram corresponding to the time domain measurement curve set, wherein the spectrogram is a corresponding relation of frequency components and amplitudes, and each frequency component corresponds to one time domain measurement curve in the time domain measurement curve set;
judging whether a difference ratio of a first amplitude to a preset target amplitude in the spectrogram is smaller than a preset difference ratio threshold value or not, wherein the preset target amplitude and the target water area have a corresponding relation;
if so, taking the frequency component corresponding to the first amplitude as a target frequency component of the target water area;
converting the target frequency component into a water level of the target water area.
The above method, optionally, further includes:
if the time domain measurement curve set does not exist, the time domain measurement curve set is abandoned, and the measurement curve set corresponding to the target water area is reselected for judgment;
and when the times of re-judgment exceed a preset judgment quantity threshold value, sending out a preset first alarm prompt.
In the above method, optionally, the time-domain measurement curve is a corresponding relationship between time and a height of the target water area or any one object from an antenna, where the antenna is one of a receiving antenna and a transmitting antenna.
The above method, optionally, further includes:
acquiring a first included angle between the water surface of the target water area and the transmitting surface of the antenna;
when the first included angle is smaller than or equal to a preset critical angle, compensating the water level of the target water area according to the first included angle;
and when the first included angle is larger than a preset critical angle, sending a preset second alarm prompt.
Optionally, the obtaining of the time domain measurement curve set corresponding to the target water area includes:
according to a preset sampling frequency, signals of corresponding relations between time and heights of all objects in the target water area are simultaneously acquired in a same-direction channel and an orthogonal channel;
and when the acquisition times meet a preset acquisition threshold value, superposing the signals of the objects in the equidirectional channel and the orthogonal channel according to a preset relation to obtain a time domain measurement curve set corresponding to the target water area.
The above method, optionally, converting the target frequency component into the water level of the target water area includes:
acquiring a target time domain measurement curve corresponding to the target frequency component;
performing fast Fourier transform on the target time domain measurement curve to obtain an optimal target frequency component;
converting the preferred target frequency component into a water level of the target water area.
A water level measuring system is applied to water level measuring equipment and comprises:
the system comprises a first acquisition unit, a second acquisition unit and a third acquisition unit, wherein the first acquisition unit is used for acquiring a time domain measurement curve set corresponding to a target water area, and the time domain measurement curve set comprises the target water area and time domain measurement curves of objects in the target water area;
the transformation unit is used for performing fast Fourier transform on each time domain measurement curve in the time domain measurement curve set to obtain a spectrogram corresponding to the time domain measurement curve set, wherein the spectrogram is a corresponding relation between frequency components and amplitude, and each frequency component corresponds to one time domain measurement curve in the time domain measurement curve set;
the judging unit is used for judging whether the difference ratio of the first amplitude and a preset target amplitude in the spectrogram is smaller than a preset difference ratio threshold value or not, and the preset target amplitude and the target water area have a corresponding relation;
a determining unit, configured to determine, when the first amplitude exists, a frequency component corresponding to the first amplitude as a target frequency component of the target water area;
a conversion unit for converting the target frequency component into a water level of the target water area.
The above system, optionally, further includes:
the judging unit is used for abandoning the time domain measurement curve set and reselecting the measurement curve set corresponding to the target water area for judgment when the time domain measurement curve set does not exist;
and the first alarm unit is used for sending out a preset first alarm prompt when the number of times of re-judgment exceeds a preset judgment threshold value.
The above system, optionally, further includes:
the second acquisition unit is used for acquiring a first included angle between the water surface of the target water area and the transmitting surface of the antenna;
the compensation unit is used for compensating the water level of the target water area according to the first included angle when the first included angle is smaller than or equal to a preset critical angle;
and the second alarm unit is used for sending out a preset second alarm prompt when the first included angle is larger than a preset critical angle.
A water level measuring apparatus comprising: transmitting antenna, receiving antenna, triaxial acceleration sensor, transceiver, microcontroller and input/output interface, wherein:
the transmitting antenna is used for transmitting triangular wave modulation signals;
the receiving antenna is used for receiving the triangular wave modulation signal fed back by the target water area;
the three-axis acceleration sensor is used for measuring the first included angle;
the transceiver is used for generating the triangular wave modulation signal, analyzing the received triangular wave modulation signal fed back by the target water area into an equidirectional signal and an orthogonal signal, transmitting the equidirectional signal to an equidirectional channel and transmitting the orthogonal signal to an orthogonal channel;
the microcontroller is configured to obtain a time domain measurement curve set corresponding to a target water area, where the time domain measurement curve set includes time domain measurement curves of the target water area and objects in the target water area, perform fast fourier transform on each time domain measurement curve in the time domain measurement curve set to obtain a spectrogram corresponding to the time domain measurement curve set, where the spectrogram is a corresponding relationship between frequency components and amplitudes, where each frequency component corresponds to one time domain measurement curve in the time domain measurement curve set, determine whether a difference ratio between a first amplitude and a preset target amplitude in the spectrogram is smaller than a preset difference ratio threshold, where the preset target amplitude and the target water area have a corresponding relationship, and when the frequency component corresponding to the first amplitude exists, use the frequency component corresponding to the first amplitude as a target frequency component of the target water area, converting the target frequency component into a water level of the target water area;
and the input and output interface is used for communicating with other interfaces.
Compared with the prior art, the invention has the following advantages:
the invention discloses a water level measuring method, which comprises the following steps: acquiring a time domain measurement curve set of a target water area, determining a spectrogram corresponding to the target water area according to each time domain measurement curve in the time domain measurement curve set, wherein the spectrogram is a corresponding relation between frequency components and amplitudes, each frequency component corresponds to one time domain measurement curve in a time domain, and judging whether a difference ratio of a first amplitude and a preset target amplitude in the spectrogram is smaller than a preset difference ratio threshold value or not; when the frequency component exists, the frequency component corresponding to the first amplitude is the target frequency component of the target water area; converting the target frequency component into a water level of the target water area. According to the method, the target frequency component corresponding to the target water area is preferentially determined, and the target frequency component is converted into the water level of the target water area, so that the problems that the radar water level gauge is easily influenced by a floater on the water surface, the distance from the probe to the floater is the measured result, and the measured result is inaccurate are solved.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a water level measuring method disclosed in an embodiment of the present application;
FIG. 2 is a flowchart of another method for measuring water level according to the embodiment of the present disclosure;
FIG. 3 is a flowchart of another method for measuring water level according to the embodiment of the present disclosure;
FIG. 4 is a flowchart of another method for measuring water level according to the embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a water level measuring apparatus according to an embodiment of the present disclosure;
fig. 6 is a block diagram of a water level measuring system according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The invention provides a water level measuring method, wherein an execution main body of the method can be a microcontroller or a microprocessor, and the method is applied to water level measuring equipment comprising the microprocessor or the microcontroller. The method flow of the water level measuring method is shown in fig. 1, and comprises the following steps:
s101, acquiring a time domain measurement curve set corresponding to a target water area, wherein the time domain measurement curve set comprises the target water area and time domain measurement curves of all objects in the target water area;
in the embodiment of the invention, the target water area is a water area which is currently measured, and the target water area can be a river, a lake, a reservoir, a ship lock or an irrigation area and the like. The method comprises the steps that floating objects, boulders or earth slopes and other objects higher than the water surface possibly exist in a target water area, a time domain measurement curve corresponding to each object is obtained according to a radar wave transmitting mode, the time domain measurement curve is a corresponding relation between time and the height of the target water area or any object from an antenna, the antenna is one of a receiving antenna and a transmitting antenna, the time domain measurement curves corresponding to the objects in the target water area are collected, and a time domain measurement curve set corresponding to the target water area is obtained.
S102, performing fast Fourier transform on each time domain measurement curve in the time domain measurement curve set to obtain a spectrogram corresponding to the time domain measurement curve set, wherein the spectrogram is a corresponding relation between frequency components and amplitude, and each frequency component corresponds to one time domain measurement curve in the time domain measurement curve set;
in the embodiment of the invention, each time domain measurement curve in the time domain measurement curve set is subjected to fast Fourier transform, and a spectrogram corresponding to the time domain measurement curve set is formed by the corresponding relation of a plurality of frequency components and amplitudes.
S103, judging whether a difference ratio of a first amplitude and a preset target amplitude in the spectrogram is smaller than a preset difference ratio threshold value or not, wherein the preset target amplitude and the target water area have a corresponding relation;
in the embodiment of the present invention, preferably, a corresponding relationship between a plurality of peak-to-peak frequencies in the frequency spectrum and amplitudes is selected, and whether a difference ratio between a first amplitude and a preset target amplitude in each amplitude corresponding to the plurality of peak-to-peak frequencies is smaller than a preset difference ratio threshold is determined, where the preset difference ratio threshold may be given by an empirical value or may be specifically set according to an actual situation.
S104, when the frequency component exists, taking the frequency component corresponding to the first amplitude as a target frequency component of the target water area;
in the embodiment of the present invention, a frequency component corresponding to the first amplitude is searched in the spectrogram, and when the frequency component exists, the frequency component corresponding to the first amplitude is taken as a target frequency component of the target water area.
And S105, converting the target frequency component into the water level of the target water area.
In the embodiment of the invention, a target time domain measurement curve corresponding to the target frequency component is obtained, fast Fourier transform is performed on the target time domain measurement curve to obtain an optimal target frequency component, meanwhile, a system parameter matched with the water level measurement equipment needs to be determined, and the product of the system parameter and the optimal target frequency component is used as the water level of the target water area.
In the embodiment of the invention, the preset target amplitude is stored in a standard water level signal frequency amplitude comparison table, and the standard water level signal frequency amplitude comparison table stores the corresponding relation between the standard water level amplitude and the frequency.
In an embodiment of the present invention, the difference ratio is calculated as a ratio of an absolute value of a difference between the first amplitude and the preset target amplitude to the preset target amplitude.
The invention discloses a water level measuring method, which comprises the following steps: acquiring a time domain measurement curve set of a target water area, determining a spectrogram corresponding to the target water area according to each time domain measurement curve in the time domain measurement curve set, wherein the spectrogram is a corresponding relation between frequency components and amplitudes, each frequency component corresponds to one time domain measurement curve in a time domain, and judging whether a difference ratio of a first amplitude and a preset target amplitude in the spectrogram is smaller than a preset difference ratio threshold value or not; when the frequency component exists, the frequency component corresponding to the first amplitude is the target frequency component of the target water area; converting the target frequency component into a water level of the target water area. According to the method, the target frequency component corresponding to the target water area is preferentially determined, and the target frequency component is converted into the water level of the target water area, so that the problems that the radar water level gauge is easily influenced by a floater on the water surface, the distance from the probe to the floater is the measured result, and the measured result is inaccurate are solved.
In the embodiment of the invention, the method further comprises the following steps: and when the time domain measurement curve set does not exist, the time domain measurement curve set is abandoned, the measurement curve set corresponding to the target water area is reselected for judgment, and when the times of re-judgment exceed a preset judgment quantity threshold value, a preset first alarm prompt is sent. The preset first alarm prompt can be a prompt tone or a corresponding error code is returned.
In the embodiment of the invention, the method for acquiring the time domain measurement curve set corresponding to the target water area comprises the following steps: according to a preset sampling frequency, signals of corresponding relations between time and heights of all objects in the target water area are simultaneously acquired in a same-direction channel and an orthogonal channel; and when the acquisition times meet a preset acquisition threshold value, superposing the signals of the objects in the equidirectional channel and the orthogonal channel according to a preset relation to obtain a time domain measurement curve set corresponding to the target water area.
The purpose of acquiring the preset acquisition threshold times of the equidirectional signals and the orthogonal signals in the equidirectional channel and the orthogonal channel is to improve the signal-to-noise ratio of the intermediate frequency sampling signals and enhance the anti-interference capability of the signals.
In the embodiment of the present invention, a processing procedure of performing fast fourier transform FFT on each time domain measurement curve in the time domain measurement curve set to obtain a spectrogram corresponding to the time domain measurement curve set is shown in fig. 2. First, the acquisition is initialized to 1, and preferably, a triangular wave is waitedThe periodic delay signal is corresponding fixed delay time in a triangular wave, when sampling time comes, I1 and Q1 data of K points are continuously acquired at the same time, data point acquisition is completed, and the number of marked acquisition times is increased by 1 until N times of sampling is completed. And then, the N times of sampling data are superposed to respectively obtain processed I and Q data, and the calculation formula is as follows: i (k) ═ I1(k)+I2(k)+...+In(k) And Q (k) ═ Q1(k)+Q2(k)+...+Qn(k) In that respect And then FFT is carried out on the I and Q to obtain the frequency spectrum of the sampling signal. The complex FFT adopted by the FFT has the formula: f (k) ═ FFT (I (k) + jQ (k)), and finally, a plurality of frequency components of the sampled signal and corresponding amplitudes F are obtainediAnd pi。
In the embodiment of the invention, according to the fiAnd said piThe flow chart of the execution flow of determining the water level of the target water area is shown in fig. 3, wherein we follow the peak-peak value f of the frequency component in the spectrum analysisiAnd corresponding amplitude piAnd selecting N frequency points. And then comparing the target amplitude with the preset target amplitude according to the amplitude sequence. And when the error between the amplitude corresponding to a certain frequency point in the sampling signal and the preset target amplitude is less than 5%, the signal frequency is considered as the frequency of the target water area signal. When each amplitude in the spectrogram does not accord with the preset target amplitude, the system collects the equidirectional signals and orthogonal signals again until the values which do not accord for 3 times are collected, and the system outputs a corresponding code E01 which represents that the water level information meeting the conditions is not measured. And when the target frequency component is found, taking the target frequency component as the frequency component of the target water level signal, and filtering other frequency components in the same-direction signal and the orthogonal signal by using a notch filter to remove other frequency components. And filtering the homodromous signals, wherein the orthogonal signals only comprise the signals of the target water area, performing FFT (fast Fourier transform) on the signals to obtain optimal target frequency components, and further improving the frequency resolution and the frequency calculation precision by using a frequency spectrum thinning method.
After the optimal target frequency component corresponding to the target water level is obtained, the optimal target frequency component is refined by using a gradient search algorithm to obtain a water level signal frequency value f with higher precision, and the distance H (f) k from the antenna to the water surface can be obtained according to the principle of frequency modulated continuous wave FMCW (frequency modulated continuous wave), wherein k is a system parameter, and the value is a constant for a specific system. The distance H is the real distance of the antenna from the water surface if the water surface and the radiating surface of the antenna are parallel.
In the embodiment of the present invention, when the angle θ exists between the water surface of the target water area and the emitting surface of the antenna, a specific real distance calculation process is shown in fig. 4. Wherein the distance calculation formula is HReality (reality)H cos (θ). When theta is larger than 5 degrees, the distance calculated by using formula correction also has larger error, and at the moment, the system outputs an alarm code E02 to prompt that the angle between the antenna and the water surface needs to be adjusted, so that the accuracy of water level measurement is ensured.
In this embodiment, the above water level measuring method is applied to a water level measuring apparatus, and the water level measuring apparatus includes: the structure block diagram of the water level measuring device is shown in fig. 5, wherein:
the transmitting antenna is used for transmitting triangular wave modulation signals;
the receiving antenna is used for receiving the triangular wave modulation signal fed back by the target water area;
the three-axis acceleration sensor is used for measuring the first included angle;
the transceiver is used for generating the triangular wave modulation signal, analyzing the received triangular wave modulation signal fed back by the target water area into an equidirectional signal and an orthogonal signal, transmitting the equidirectional signal to an equidirectional channel and transmitting the orthogonal signal to an orthogonal channel;
the microcontroller is configured to obtain a time domain measurement curve set corresponding to a target water area, where the time domain measurement curve set includes time domain measurement curves of the target water area and objects in the target water area, perform fast fourier transform on each time domain measurement curve in the time domain measurement curve set to obtain a spectrogram corresponding to the time domain measurement curve set, where the spectrogram is a corresponding relationship between frequency components and amplitudes, where each frequency component corresponds to one time domain measurement curve in the time domain measurement curve set, determine whether a difference ratio between a first amplitude and a preset target amplitude in the spectrogram is smaller than a preset difference ratio threshold, where the preset target amplitude and the target water area have a corresponding relationship, and when the frequency component corresponding to the first amplitude exists, use the frequency component corresponding to the first amplitude as a target frequency component of the target water area, converting the target frequency component into a water level of the target water area;
and the input and output interface is used for communicating with other interfaces.
In an embodiment of the present invention, corresponding to the above water level measuring method, an embodiment of the present invention further provides a water level measuring system applied to the water level measuring apparatus, and a structural block diagram of the water level measuring system is shown in fig. 6, and the water level measuring system includes:
a first acquisition unit 201, a transformation unit 202, a judgment unit 203, a determination unit 204, and a conversion unit 205.
Wherein the content of the first and second substances,
the first obtaining unit 201 is configured to obtain a time domain measurement curve set corresponding to a target water area, where the time domain measurement curve set includes time domain measurement curves of the target water area and objects in the target water area;
the transforming unit 202 is configured to perform fast fourier transform on each time domain measurement curve in the time domain measurement curve set to obtain a spectrogram corresponding to the time domain measurement curve set, where the spectrogram is a corresponding relationship between frequency components and amplitudes, and each frequency component corresponds to one time domain measurement curve in the time domain measurement curve set;
the determining unit 203 is configured to determine whether a difference ratio between the first amplitude and a preset target amplitude in the spectrogram is smaller than a preset difference ratio threshold, where the preset target amplitude and the target water area have a corresponding relationship;
the determining unit 204 is configured to, when the first amplitude exists, determine that the frequency component corresponding to the first amplitude is a target frequency component of the target water area;
the conversion unit 205 is configured to convert the target frequency component into a water level of the target water area.
The invention discloses a water level measuring system, comprising: acquiring a time domain measurement curve set of a target water area, determining a spectrogram corresponding to the target water area according to each time domain measurement curve in the time domain measurement curve set, wherein the spectrogram is a corresponding relation between frequency components and amplitudes, each frequency component corresponds to one time domain measurement curve in a time domain, and judging whether a difference ratio of a first amplitude and a preset target amplitude in the spectrogram is smaller than a preset difference ratio threshold value or not; when the frequency component exists, the frequency component corresponding to the first amplitude is the target frequency component of the target water area; converting the target frequency component into a water level of the target water area. According to the system, the target frequency component corresponding to the target water area is preferentially determined, and the target frequency component is converted into the water level of the target water area, so that the problems that a radar water level gauge is easily influenced by a floater on the water surface, the distance from a probe to the floater is the measured result, and the measured result is inaccurate are solved.
In an embodiment of the present invention, the water level measuring system further includes: a judging unit and a first alarm unit.
Wherein the content of the first and second substances,
the judging unit is used for abandoning the time domain measurement curve set and reselecting the measurement curve set corresponding to the target water area for judgment when the time domain measurement curve set does not exist;
and the first alarm unit is used for sending out a preset first alarm prompt when the number of times of re-judgment exceeds a preset judgment threshold value.
In an embodiment of the present invention, the water level measuring system further includes: the device comprises a second acquisition unit, a compensation unit and a second alarm unit.
Wherein the content of the first and second substances,
the second acquisition unit is used for acquiring a first included angle between the water surface of the target water area and the transmitting surface of the antenna;
the compensation unit is used for compensating the water level of the target water area according to the first included angle when the first included angle is smaller than or equal to a preset critical angle;
and the second alarm unit is used for sending out a preset second alarm prompt when the first included angle is larger than a preset critical angle.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functions of the units may be implemented in the same software and/or hardware or in a plurality of software and/or hardware when implementing the invention.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The above detailed description is provided for a water level measuring method, system and device provided by the present invention, and the principle and implementation of the present invention are explained in the present document by applying specific examples, and the description of the above examples is only used to help understanding the method and core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A water level measuring method is characterized by being applied to a water level measuring device and comprising the following steps:
acquiring a time domain measurement curve set corresponding to a target water area, wherein the time domain measurement curve set comprises the target water area and time domain measurement curves of all objects in the target water area; the object is a floating object in the target water area;
performing Fourier transform on each time domain measurement curve in the time domain measurement curve set to obtain a spectrogram corresponding to the time domain measurement curve set, wherein the spectrogram is a corresponding relation of frequency components and amplitudes, and each frequency component corresponds to one time domain measurement curve in the time domain measurement curve set;
selecting a corresponding relation between a plurality of peak-to-peak frequencies and amplitudes in the spectrogram, and judging whether a difference ratio of a first amplitude and a preset target amplitude in each amplitude corresponding to the plurality of peak-to-peak frequencies is smaller than a preset difference ratio threshold value or not, wherein the preset target amplitude and the target water area have a corresponding relation;
if so, taking the frequency component corresponding to the first amplitude as a target frequency component of the target water area;
converting the target frequency component into a water level of the target water area.
2. The method of claim 1, further comprising:
if the time domain measurement curve set does not exist, the time domain measurement curve set is abandoned, and the measurement curve set corresponding to the target water area is reselected for judgment;
and when the times of re-judgment exceed a preset judgment quantity threshold value, sending out a preset first alarm prompt.
3. The method of claim 1, wherein the time domain measurement curve is a time versus height of the target water area or any object from an antenna, the antenna being one of a receiving antenna or a transmitting antenna.
4. The method of claim 3, further comprising:
acquiring a first included angle between the water surface of the target water area and the transmitting surface of the antenna;
when the first included angle is smaller than or equal to a preset critical angle, compensating the water level of the target water area according to the first included angle;
and when the first included angle is larger than a preset critical angle, sending a preset second alarm prompt.
5. The method of claim 1, wherein obtaining the set of time domain measurement curves corresponding to the target water area comprises:
according to a preset sampling frequency, signals of corresponding relations between time and heights of all objects in the target water area are simultaneously acquired in a same-direction channel and an orthogonal channel;
and when the acquisition times meet a preset acquisition threshold value, superposing the signals of the objects in the equidirectional channel and the orthogonal channel according to a preset relation to obtain a time domain measurement curve set corresponding to the target water area.
6. The method of claim 1, wherein converting the target frequency component to a water level of the target water area comprises:
acquiring a target time domain measurement curve corresponding to the target frequency component;
performing fast Fourier transform on the target time domain measurement curve to obtain an optimal target frequency component;
converting the preferred target frequency component into a water level of the target water area.
7. A water level measuring system, which is applied to a water level measuring apparatus, includes:
the system comprises a first acquisition unit, a second acquisition unit and a third acquisition unit, wherein the first acquisition unit is used for acquiring a time domain measurement curve set corresponding to a target water area, and the time domain measurement curve set comprises the target water area and time domain measurement curves of objects in the target water area; the object is a floating object in the target water area;
the transformation unit is used for performing fast Fourier transform on each time domain measurement curve in the time domain measurement curve set to obtain a spectrogram corresponding to the time domain measurement curve set, wherein the spectrogram is a corresponding relation between frequency components and amplitude, and each frequency component corresponds to one time domain measurement curve in the time domain measurement curve set;
the judging unit is used for selecting the corresponding relation between a plurality of peak-to-peak frequencies and amplitudes in the spectrogram, and judging whether the difference ratio of a first amplitude and a preset target amplitude in each amplitude corresponding to the plurality of peak-to-peak frequencies is smaller than a preset difference ratio threshold value or not, wherein the preset target amplitude and the target water area have the corresponding relation;
a determining unit, configured to determine, when the first amplitude exists, a frequency component corresponding to the first amplitude as a target frequency component of the target water area;
a conversion unit for converting the target frequency component into a water level of the target water area.
8. The system of claim 7, further comprising:
the judging unit is used for abandoning the time domain measurement curve set and reselecting the measurement curve set corresponding to the target water area for judgment when the time domain measurement curve set does not exist;
and the first alarm unit is used for sending out a preset first alarm prompt when the number of times of re-judgment exceeds a preset judgment threshold value.
9. The system of claim 7, further comprising:
the second acquisition unit is used for acquiring a first included angle between the water surface of the target water area and the transmitting surface of the antenna;
the compensation unit is used for compensating the water level of the target water area according to the first included angle when the first included angle is smaller than or equal to a preset critical angle;
and the second alarm unit is used for sending out a preset second alarm prompt when the first included angle is larger than a preset critical angle.
10. A water level measuring apparatus, comprising: transmitting antenna, receiving antenna, triaxial acceleration sensor, transceiver, microcontroller and input/output interface, wherein:
the transmitting antenna is used for transmitting triangular wave modulation signals;
the receiving antenna is used for receiving triangular wave modulation signals fed back by a target water area;
the three-axis acceleration sensor is used for measuring a first included angle;
the transceiver is used for generating the triangular wave modulation signal, analyzing the received triangular wave modulation signal fed back by the target water area into an equidirectional signal and an orthogonal signal, transmitting the equidirectional signal to an equidirectional channel and transmitting the orthogonal signal to an orthogonal channel;
the microcontroller is used for acquiring a time domain measurement curve set corresponding to a target water area, wherein the time domain measurement curve set comprises the target water area and a time domain measurement curve of each object in the target water area, and the object is a floater in the target water area; performing fast Fourier transform on each time domain measurement curve in the time domain measurement curve set to obtain a spectrogram corresponding to the time domain measurement curve set, wherein the spectrogram is a corresponding relation of frequency components and amplitudes, each frequency component corresponds to one time domain measurement curve in the time domain measurement curve set, selecting a corresponding relation of a plurality of peak-to-peak frequencies and amplitudes in the spectrogram, judging whether a difference ratio of a first amplitude to a preset target amplitude in each amplitude corresponding to the plurality of peak-to-peak frequencies is smaller than a preset difference ratio threshold, the preset target amplitude corresponds to the target water area, and when the difference ratio exists, taking the frequency component corresponding to the first amplitude as a target frequency component of the target water area and converting the target frequency component into the water level of the target water area;
and the input and output interface is used for communicating with other interfaces.
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