CN117782262A - Water level change monitoring method and device, computer equipment and storage medium - Google Patents
Water level change monitoring method and device, computer equipment and storage medium Download PDFInfo
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Abstract
The invention relates to the field of water conservancy monitoring, and discloses a water level change monitoring method, a device, computer equipment and a storage medium, wherein the method comprises the following steps: acquiring a reference echo signal and a current echo signal returned by a monitored water area; respectively carrying out signal mixing processing on the reference echo signal and the current echo signal to obtain beat frequency signals; performing Fourier transform on the beat frequency signals, calculating the relative distance between the signal transmitting device and the water surface of the monitored water area and the relative angle between the signal transmitting device and the water surface of the monitored water area based on the signals after the Fourier transform, and calculating a water level value based on the relative distance and the relative angle; the invention replaces contact measurement by echo signals to avoid direct contact with water flow, thereby realizing monitoring of water level change, reducing measurement cost and improving accuracy of water level change monitoring.
Description
Technical Field
The invention relates to the technical field of water conservancy monitoring, in particular to a water level change monitoring method, a water level change monitoring device, computer equipment and a storage medium.
Background
In recent years, urban waterlogging caused by heavy rainfall or continuous rainfall occurs, and the urban waterlogging directly affects the living order of residents, so that the pressure in traffic and other aspects is increased. The river water level monitoring is an indispensable part in the urban monitoring system, and can timely discover signs of flood, so that residents can take necessary preventive measures.
In the prior art, contact measurement is often adopted to monitor the river water level, that is, a water level scale is adopted to measure the river water level, so as to monitor the water level change. However, the adoption of contact measurement to measure the water level increases the manual operation intensity, and the water level gauge is in direct contact with water flow, is easily influenced by sludge and floaters, needs to be replaced in time, increases the measurement cost, and causes difficulty in monitoring the water level change.
Disclosure of Invention
In view of the above, the present invention provides a method, an apparatus, a computer device and a storage medium for monitoring water level change, so as to solve the problem that in the prior art, the water level of a river is affected by the increase of manual operation strength and the increase of measurement cost by adopting contact measurement, and the water level change is not easy to monitor.
In a first aspect, the present invention provides a water level change monitoring method, the method comprising:
acquiring a reference echo signal and a current echo signal returned by a monitoring water area, wherein the reference echo signal is an echo signal returned by the monitoring water area after receiving a reference radar signal transmitted by a signal transmitting device, and the current echo signal is an echo signal returned by the monitoring water area after receiving the current radar signal transmitted by the signal transmitting device;
respectively carrying out signal mixing processing on the reference echo signal and the current echo signal to obtain beat frequency signals, wherein the beat frequency signals comprise a reference beat frequency signal and a current beat frequency signal;
performing Fourier transform on the beat frequency signals, calculating the relative distance between the signal transmitting device and the water surface of the monitored water area and the relative angle between the signal transmitting device and the water surface of the monitored water area based on the signals after the Fourier transform, and calculating a water level value based on the relative distance and the relative angle, wherein the water level value comprises a reference water level value and a current water level value;
and comparing the reference water level value with the current water level value to obtain a water level change monitoring result of the monitored water area.
According to the invention, the water level value of the monitored water area is represented by collecting the reference echo signal and the current echo signal returned by the monitored water area, so that the contact type measurement is replaced, direct contact with water flow is avoided, the reference water level value and the current water level value are calculated according to signal processing of the reference beat frequency signal and the current beat frequency signal, the water level change is monitored by replacing the contact type measurement, the measurement cost is reduced, and meanwhile, the accuracy of the water level change monitoring is improved.
In an alternative embodiment, calculating the relative distance between the signal emitting device and the surface of the monitored water and the relative angle between the signal emitting device and the surface of the monitored water based on the fourier transformed signals includes:
extracting the time difference between the signal transmitting time of the signal transmitting device and the signal receiving time of the monitoring water area from the beat frequency signals after Fourier transformation;
according to the time difference, calculating the relative distance between the signal transmitting device and the water surface of the monitored water area;
extracting echo signals with different phases received by a signal transmitting device from the signals after Fourier transformation, and calculating the relative angles of the signal transmitting device and the water surface of the monitored water area according to the echo signals with different phases;
and calculating the water level value according to the relative distance between the signal transmitting device and the water surface of the monitored water area and the relative angle between the signal transmitting device and the water surface of the monitored water area.
The invention calculates the relative distance between the signal transmitting device and the water surface of the monitored water area and the relative angle between the signal transmitting device and the water surface of the monitored water area by carrying out signal processing on the beat frequency signals, thereby calculating the water level value by utilizing the relative distance and the relative angle and calculating the water level value under the condition of not directly contacting with water flow so as to monitor the change of the water level value.
In an alternative embodiment, the water level value is calculated according to the following formula:
h 1 ＝d 1 cosα 1
wherein h is 1 D is the reference water level value 1 Alpha is the relative distance between the time of transmitting the reference radar to the signal transmitting device and the water surface of the monitored water area 1 The relative angle between the time of transmitting the reference radar for the signal transmitting device and the water surface of the monitored water area;
h 2 ＝d 2 cosα 2
wherein h is 2 D is the current water level value 2 Alpha is the relative distance between the current radar and the water surface of the monitored water area transmitted by the signal transmitting device 2 The relative angle between the current radar and the water surface of the monitored water area is transmitted by the signal transmitting device.
According to the invention, the reference water level value and the current water level value are calculated through a formula, so that the water level value is measured.
In an alternative embodiment, extracting a time difference between a signal transmission time of the signal transmission device and a signal reception time of the monitoring water area from the fourier transformed signal comprises:
determining a spectrogram corresponding to the beat frequency signal after Fourier transformation;
extracting amplitude frequency characteristics in the spectrogram to obtain an amplitude frequency spectrum of the beat frequency signal;
extracting a first peak frequency range of the amplitude from the amplitude spectrum;
performing secondary Fourier transform on the signals in the first peak frequency range, and extracting a spectrogram in the second peak frequency range from the signals subjected to secondary Fourier transform;
And calculating the time difference between the signal transmitting time of the signal transmitting device and the signal receiving time of the monitoring water area according to the spectrogram in the second peak frequency range.
The invention carries out Fourier transformation again on the signal in the first peak frequency range so as to reduce the second peak frequency range, obtain a spectrogram in a finer peak frequency range, and improve the precision of the time difference between the signal transmitting time and the signal receiving time of the monitoring water area.
In an alternative embodiment, after comparing the reference water level value with the current water level value to obtain a water level change monitoring result of the monitored water area, the method further comprises:
determining a difference value between the current water level value and the reference water level value as a current water level difference;
acquiring a reference echo signal and a current echo signal returned by a monitoring water area in a preset monitoring period;
determining a water level value in a preset monitoring period according to a reference echo signal and a current echo signal returned in the preset monitoring period, and determining a change value of a water level difference based on a difference value between the water level value and the reference water level value in the preset monitoring period;
generating early warning information according to the current water level difference and the change value of the water level difference, and carrying out early warning according to the early warning information.
According to the invention, the water level difference in the monitoring period is monitored to obtain the change value of the water level difference in the monitoring period, so that early warning is conveniently carried out according to the current water level difference and the change value of the water level difference, and the surrounding crowd is reminded.
In an alternative embodiment, the generating the early warning information according to the current water level difference and the change value of the water level difference includes:
acquiring a preset water level difference, and comparing the current water level difference with the preset water level difference;
if the current water level difference is larger than the preset water level difference, judging whether the water level continuously rises or not according to the change value of the water level difference;
if the current water level continuously rises, determining the water level rising speed according to the dividing result of the change value of the water level difference and the preset monitoring period;
acquiring a preset water level rising speed, and comparing the water level rising speed with the preset water level rising speed;
if the water level rising speed is greater than the preset water level rising speed, generating early warning information.
In an alternative embodiment, the method further comprises:
if the current water level difference is larger than the preset water level difference and the current water level does not continuously rise, or if the current water level difference is larger than the preset water level difference and the current water level continuously rises and the water level rising speed is not larger than the preset water level rising speed, modifying the preset monitoring period;
And re-acquiring the reference echo signal and the current echo signal returned by the monitored water area every other modified preset monitoring period.
The invention monitors the current water level value, whether the water level continuously rises or not and the water level rising speed, and generates early warning information to remind surrounding people or modify the preset monitoring period so as to accelerate the monitoring frequency or reduce the monitoring frequency.
In a second aspect, the present invention provides a water level change monitoring device comprising:
the acquisition module is used for acquiring a reference echo signal and a current echo signal returned by the monitoring water area, wherein the reference echo signal is an echo signal returned by the monitoring water area after receiving the reference radar signal transmitted by the signal transmitting device, and the current echo signal is an echo signal returned by the monitoring water area after receiving the current radar signal transmitted by the signal transmitting device;
the signal processing module is used for respectively carrying out signal mixing processing on the reference echo signal and the current echo signal to obtain beat frequency signals, wherein the beat frequency signals comprise the reference beat frequency signal and the current beat frequency signal;
the calculation module is used for carrying out Fourier transform on the beat frequency signals, calculating the relative distance between the signal transmitting device and the water surface of the monitored water area and the relative angle between the signal transmitting device and the water surface of the monitored water area based on the signals after the Fourier transform, and calculating a water level value based on the relative distance and the relative angle, wherein the water level value comprises a reference water level value and a current water level value;
And the monitoring module is used for comparing the reference water level value with the current water level value to obtain a water level change monitoring result of the monitored water area.
In a third aspect, the present invention provides a computer device comprising: the water level change monitoring system comprises a memory and a processor, wherein the memory and the processor are in communication connection, the memory stores computer instructions, and the processor executes the computer instructions, so that the water level change monitoring method of the first aspect or any corresponding implementation mode is executed.
In a fourth aspect, the present invention provides a computer-readable storage medium having stored thereon computer instructions for causing a computer to execute the water level change monitoring method of the first aspect or any one of its corresponding embodiments.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a water level change monitoring method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an application of a water level change monitoring method according to an embodiment of the present invention;
FIG. 3 is a flow chart of another water level change monitoring method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the principle of calculating a water level value according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of calculating a reference water level value according to an embodiment of the invention;
FIG. 6 is a flow chart of calculating a current water level value according to an embodiment of the present invention;
FIG. 7 is a flow chart of yet another water level change monitoring method according to an embodiment of the present invention;
FIG. 8 is a schematic flow chart of early warning through a display according to an embodiment of the invention;
fig. 9 is a block diagram of a water level change monitoring apparatus according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a hardware structure of a computer device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The water level data monitoring is used as an important part in hydrologic monitoring, and has important significance for flood prevention, drought resistance, irrigation, shipping and water conservancy facility construction and management. In order to obtain accurate water level monitoring data, a water level measurement is required. Currently, the common water level measurement method mainly includes contact measurement, non-contact measurement and image measurement.
The contact measurement is to directly measure the water level through a water level scale, and obtain water level information by directly reading according to the position of the water level on the scale. The method is simple and visual, manual reading is needed, the degree of automation is low, the manual operation intensity is increased, water level information in a continuous period cannot be provided, the water level scale is soaked in water flow for a long time and is influenced by corrosion and scouring of the water flow, the water level scale is unclear in scale and inclined and offset in position, the measurement result is inaccurate, and the direct contact with the water flow is easily influenced by sludge and floaters in the water flow, so that the water level scale needs to be maintained and replaced regularly, and the measurement cost is increased.
The non-contact measurement comprises ultrasonic measurement and laser ranging, and the acquisition of water level information is completed by means of an ultrasonic sensor and a laser radar. Ultrasonic measurement is to measure the water level by utilizing the characteristic that sound waves reflect at a medium interface with different acoustic impedances or encounter obstacles, and deduce distance information by measuring the transmission time and the propagation speed of the sound waves. The method can realize automatic measurement of the water level, has high accuracy of measurement results, and is easily influenced by the environment such as external temperature, humidity, atmospheric pressure, wind speed and the like, thereby causing measurement errors. The distance measurement principle of laser distance measurement is similar to that of ultrasonic distance measurement, and the laser distance measurement utilizes the advantages of good monochromaticity and strong directivity of laser to achieve millimeter-level measurement accuracy, but the laser is easily affected by environment such as external dense fog, rain, strong light and the like, so as to cause measurement errors. Especially in extreme weather, the use of non-contact measurement errors increases dramatically.
The image measurement is to collect monitoring video images and remote sensing images, realize water level measurement by means of image recognition technology, extract water level lines from the images and recognize water gauge scales. According to the measuring method, a water level gauge and video image acquisition equipment are required to be arranged at a measuring place, but the accuracy of the video image acquisition equipment and an image recognition algorithm are affected, the algorithm complexity of the video image acquisition equipment can affect the extraction speed of water level data, and the video image acquisition equipment is affected by the severe environment of the outside to reduce performance, even fail and increase measuring errors.
According to an embodiment of the present invention, there is provided a water level change monitoring method embodiment, it being noted that the steps shown in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is shown in the flowchart, in some cases the steps shown or described may be performed in an order other than that shown or described herein.
In this embodiment, a water level change monitoring method is provided, which may be used in a mobile terminal, and fig. 1 is a flowchart of the water level change monitoring method according to an embodiment of the present invention, as shown in fig. 1, where the flowchart includes the following steps:
Step S101, a reference echo signal and a current echo signal returned by a monitored water area are obtained.
In the embodiment of the invention, the reference echo signal is an echo signal returned by the monitoring water area after receiving the reference radar signal transmitted by the signal transmitting device, and the current echo signal is an echo signal returned by the monitoring water area after receiving the current radar signal transmitted by the signal transmitting device.
Before measuring the water level of the monitored water area, as shown in fig. 2, the signal transmitting device is firstly used for transmitting a reference radar signal to the monitored water area, judging whether an echo signal is received, and determining the received echo signal as a reference echo signal returned by the water surface after the reference radar signal is received by the monitored water area. And if the echo signal is not received, the control signal transmitting device transmits the reference radar signal to the monitored water area again.
When the water level of the monitored water area is measured, as shown in fig. 2, the system enters a working mode, a signal transmitting device is used for transmitting a current radar signal to the monitored water area, whether an echo signal is received or not is judged, and when the echo signal is received, the received echo signal is determined to be the current echo signal returned by the monitored water area after the reference radar signal is received. And if the echo signal is not received, the control signal transmitting device transmits the current radar signal to the monitored water area again. Specifically, the radar signal transmitted by the signal transmitting device may be a millimeter wave radar signal, or may be other radar signals, which is only used as an example and not as a limitation.
Step S102, signal mixing processing is carried out on the reference echo signal and the current echo signal respectively, and a beat signal is obtained.
In the embodiment of the invention, the beat frequency signals comprise a reference beat frequency signal and a current beat frequency signal, the reference echo signal and the reference radar signal transmitted by the signal transmitting device are subjected to frequency mixing processing through a frequency mixer to obtain the reference beat frequency signal, and the current echo signal and the current radar signal transmitted by the signal transmitting device are subjected to frequency mixing processing through the frequency mixer to obtain the current beat frequency signal.
And step S103, carrying out Fourier transform on the beat frequency signals, calculating the relative distance between the signal transmitting device and the water surface of the monitored water area and the relative angle between the signal transmitting device and the water surface of the monitored water area based on the signals after the Fourier transform, and calculating the water level value based on the relative distance and the relative angle.
In the embodiment of the invention, the water level value comprises a reference water level value and a current water level value, and the reference beat frequency signal and the current beat frequency signal are respectively subjected to Fourier transformation. And calculating the relative distance between the signal transmitting device and the water surface of the monitored water area and the relative angle between the signal transmitting device and the water surface of the monitored water area in the reference beat frequency signals after Fourier transformation, and calculating the reference water level value. And calculating the relative distance between the signal transmitting device and the water surface of the monitored water area and the relative angle between the signal transmitting device and the water surface of the monitored water area in the current beat frequency signals after Fourier transformation, and calculating the current water level value.
And step S104, comparing the reference water level value with the current water level value to obtain a water level change monitoring result of the monitored water area.
In the embodiment of the invention, the reference water level value and the current water level value are subjected to difference processing, and the comparison result of the reference water level value and the current water level value is determined, so that the water level change monitoring result of the monitored water area is obtained.
According to the water level change monitoring method, the water level value of the monitored water area is represented by collecting the reference echo signal and the current echo signal returned by the monitored water area, so that the water level value is measured instead of contact, direct contact with water flow is avoided, signal processing is carried out on the reference beat frequency signal and the current beat frequency signal, the reference water level value and the current water level value are calculated, the water level change is monitored instead of contact measurement, the measuring cost is reduced, and meanwhile the accuracy of water level change monitoring is improved.
In this embodiment, a water level change monitoring method is provided, which may be used in the mobile terminal described above, and fig. 3 is a flowchart of the water level change monitoring method according to an embodiment of the present invention, as shown in fig. 3, where the flowchart includes the following steps:
step S301, a reference echo signal and a current echo signal returned by a monitored water area are obtained.
Please refer to step S101 in the embodiment shown in fig. 1 in detail, which is not described herein.
Step S302, signal mixing processing is carried out on the reference echo signal and the current echo signal respectively, and a beat signal is obtained.
Please refer to step S102 in the embodiment shown in fig. 1 in detail, which is not described herein.
Step S303, performing Fourier transform on the beat frequency signals, calculating the relative distance between the signal transmitting device and the water surface of the monitored water area and the relative angle between the signal transmitting device and the water surface of the monitored water area based on the signals after the Fourier transform, and calculating the water level value based on the relative distance and the relative angle.
Specifically, the step S303 includes:
step S3031, extracts a time difference between the signal transmission time of the signal transmission device and the signal reception time of the monitoring water area from the fourier transformed signal.
Step S3032, calculating the relative distance between the signal transmitting device and the water surface of the monitored water area according to the time difference.
Step S3033, echo signals of different phases received by the signal transmitting device are extracted from the signals after Fourier transformation, and the relative angles between the signal transmitting device and the water surface of the monitored water area are calculated according to the echo signals of different phases.
Step S3034, the water level value is calculated according to the relative distance between the signal transmitting device and the water surface of the monitored water area and the relative angle between the signal transmitting device and the water surface of the monitored water area.
In the embodiment of the invention, the radar signal frequency transmitted by the signal transmitting device and the echo signal frequency of the monitored water area are extracted from the signals after Fourier transformation, the frequency difference between the radar signal frequency and the echo signal frequency is calculated, and the time difference between the signal transmitting time and the signal receiving time is calculated by using the following formula:
where τ is the time difference between the signal transmit time and the signal receive time, f is the frequency difference between the radar signal frequency and the echo signal frequency, and s is the slope of the transmit signal (the receive signal).
The relative distance between the signal transmitting device and the water surface of the monitored water area is calculated according to the following formula by the time difference between the signal transmitting time and the signal receiving time:
the beat frequency signals are subjected to signal processing so as to calculate the relative distance between the signal transmitting device and the water surface of the monitored water area and the relative angle between the signal transmitting device and the water surface of the monitored water area, so that the relative distance and the relative angle are utilized to calculate the water level value, and the water level value is calculated under the condition of not directly contacting with water flow, so that the change of the water level value is monitored.
In order to measure the relative signals of the signal emitting device and the surface of the monitored water area, the signal emitting device generally adopts array antennas, a plurality of array antennas are arranged in a row or a circle, and a wave beam is formed by adjusting the phase of each antenna. When the radar signal transmitted by the signal transmitting device interacts with the water surface of the monitored water area, echo signals with different phases are received by different antenna elements. And calculating the relative angle between the signal transmitting device and the water surface of the monitored water area by comparing the phase differences received by different antennas.
Specifically, the angle measurement by the phase method is to use a plurality of array antennas for arrangement, and the reflected signals generate distance differences between different antennas, so as to form phase differences. Assuming that the included angle between the water surface of the monitored water area and the normal direction of the antenna is theta and the distance between the two adjacent antennas is d, the phase difference of the two adjacent receiving antennas RX satisfiesWherein (1)>For the phase difference between two adjacent antennas, dsin (θ) is the distance between the reflected signal and the right RX antenna compared to the left RX antenna, i.e. the relative angle is calculated according to the following formula: />
As shown in fig. 4, the reference water level value is calculated according to the following formula:
h 1 ＝d 1 cosα 1
wherein h is 1 D is the reference water level value 1 Phase between the time of transmitting the reference radar to the signal transmitting device and the monitoring of the water surface of the water areaFor distance, alpha 1 The relative angle between the reference radar and the water surface of the monitored water area is transmitted by the signal transmitting device.
The current water level value is calculated according to the following formula:
h 2 ＝d 2 cosα 2
wherein h is 2 D is the current water level value 2 Alpha is the relative distance between the current radar and the water surface of the monitored water area transmitted by the signal transmitting device 2 The relative angle between the current radar and the water surface of the monitored water area is transmitted by the signal transmitting device.
Because the measurement result has randomness, in order to improve the accuracy of the reference water level value and the current water level value, as shown in fig. 5 and 6, the reference water level value and the current water level value obtained by multiple times of calculation are summed and averaged to improve the accuracy of the result. And calculating a reference water level value and a current water level value by using the formula, thereby realizing the measurement of the water level value.
Specifically, the extracting the signal transmitting time of the signal transmitting device and the signal receiving time of the monitoring water area from the fourier transformed signal in the step S3031 includes:
in step S30311, a spectrogram corresponding to the signal after fourier transform is determined.
Step S30312, the amplitude frequency characteristics in the spectrogram are extracted, and the amplitude frequency spectrum of the beat frequency signal is obtained.
Step S30313, extracts a first peak frequency range of amplitudes from the amplitude spectrum.
Step S30314, the signal in the first peak frequency range is subjected to fourier transform again, and a spectrogram in the second peak frequency range is extracted from the beat signal after fourier transform again.
Step S30315, calculating a time difference between the signal transmission time of the signal transmission device and the signal reception time of the monitoring water area according to the spectrogram in the second peak frequency range.
In the embodiment of the invention, fourier transformation is carried out on the beat frequency signal according to the following formula to obtain the frequency spectrum of the beat frequency signal:
wherein X k is the beat signal and X m is the spectrum of the beat signal.
And processing the beat frequency signal by utilizing Fourier transformation, converting the time domain signal into a frequency domain signal, drawing the frequency domain signal into a spectrogram by utilizing signal processing software or programming language, extracting amplitude-frequency characteristics in the spectrogram, obtaining an amplitude spectrum, and finding a first peak frequency range of the amplitude from the amplitude spectrum.
Taking the first peak frequency range as a frequency range of the secondary Fourier transform, and carrying out the secondary Fourier transform on the beat frequency signals in the first peak frequency range to obtain a frequency spectrum X [ m ] of the beat frequency signals after the secondary Fourier transform 1 ]Using the frequency spectrum X m 1 ]Drawing a spectrogram, extracting amplitude-frequency characteristics, and extracting a second peak frequency range from the amplitude-frequency chart to obtain the spectrogram in the second peak frequency range.
Wherein,
and step S304, comparing the reference water level value with the current water level value to obtain a water level change monitoring result of the monitored water area.
Please refer to step S104 in the embodiment shown in fig. 1 in detail, which is not described herein.
According to the water level change monitoring method, the beat frequency signal in the first peak frequency range is subjected to Fourier transform again, so that the second peak frequency range is reduced, a spectrogram in the more refined peak frequency range is obtained, and the accuracy of the time difference between the signal transmitting time and the signal receiving time of the monitored water area is improved.
In this embodiment, a water level change monitoring method is provided, which may be used in the mobile terminal described above, and fig. 7 is a flowchart of the water level change monitoring method according to an embodiment of the present invention, as shown in fig. 7, where the flowchart further includes the following steps:
Step S701, acquiring a reference echo signal and a current echo signal returned by the monitored water area.
Please refer to step S101 in the embodiment shown in fig. 1 in detail, which is not described herein.
In step S702, signal mixing processing is performed on the reference echo signal and the current echo signal, so as to obtain beat signals.
Please refer to step S102 in the embodiment shown in fig. 1 in detail, which is not described herein.
In step S703, fourier transform is performed on the beat signal, a relative distance between the signal transmitting device and the water surface of the monitored water area and a relative angle between the signal transmitting device and the water surface of the monitored water area are calculated based on the signal after fourier transform, and a water level value is calculated based on the relative distance and the relative angle.
Please refer to step S103 in the embodiment shown in fig. 1 in detail, which is not described herein.
And step S704, comparing the reference water level value with the current water level value to obtain a water level change monitoring result of the monitored water area.
Please refer to step S104 in the embodiment shown in fig. 1 in detail, which is not described herein.
Step S705, determining the difference between the current water level value and the reference water level value as the current water level difference.
Step S706, a reference echo signal and a current echo signal returned by the monitored water area in a preset monitoring period are obtained.
Step S707, determining a water level value in the preset monitoring period according to the reference echo signal and the current echo signal returned in the preset monitoring period, and determining a variation value of the water level difference based on a difference value between the water level value and the reference water level value in the preset monitoring period.
Step S708, generating early warning information according to the current water level difference and the change value of the water level difference, and carrying out early warning according to the early warning information.
In the embodiment of the invention, the current water level difference is calculated according to the following formula:
h＝h 1 -h 2
wherein h is the current water head. If h > 0, the water level rises. If h < 0, the water level drops.
The monitoring period is preset, a reference echo signal and a current echo signal returned by the monitored water area are obtained in the monitoring period, the change value of the water level difference of the monitored water area in the monitoring period is calculated according to the steps S701 to S705, and early warning is carried out according to the change value of the water level difference of the monitored water area in the monitoring period.
The water level difference in the monitoring period is monitored to obtain the change value of the water level difference in the monitoring period, so that early warning is conveniently carried out according to the current water level difference and the change value of the water level difference, and surrounding people are reminded.
In some optional embodiments, generating the early warning information according to the current water level difference and the change value of the water level difference in step S708 includes:
Step S7081, a preset water level difference is acquired, and the current water level difference is compared with the preset water level difference.
Step S7082, if the current water level difference is greater than the preset water level difference, determining whether the water level continuously rises according to the change value of the water level difference.
Step S7083, if the current water level continues to rise, determining the water level rising speed by dividing the change value of the water level difference and the preset monitoring period.
Step S7084, a preset water level rising speed is acquired, and the water level rising speed is compared with the preset water level rising speed.
Step S7085, if the water level rising speed is greater than the preset water level rising speed, generating early warning information.
Step S7086, if the current water level difference is greater than the preset water level difference and the current water level does not continuously rise, or if the current water level difference is greater than the preset water level difference and the current water level continuously rises and the water level rising speed is not greater than the preset water level rising speed, modifying the preset monitoring period.
Step S7087, reacquiring the reference echo signal and the current echo signal returned from the monitored water area every other modified preset monitoring period.
In the embodiment of the invention, the preset water level difference c is determined according to the hydrological information of the monitored water area and the surrounding environment information of the monitored water area, and whether the current water level difference h is larger than the preset water level difference c is judged. If the current water level difference h is larger than the preset water level difference c, observing e continuously measured water level differences, and judging whether the water level differences rise in sequence according to the e water level differences.
Wherein,e corresponds to the maximum timer interval repetition period within 60 minutes.
The water level rising speed is calculated according to the following formula:
the water level rising speed of the flood disasters in the historical period is obtained, and the preset water level rising speed is set according to the water level rising speed of the flood disasters in the historical period.
If the current water level difference h is larger than the preset water level difference c, the water level continuously rises, and the water level rising speed is larger than the preset water level rising speed d, flood warning is carried out. When two of the two conditions are met, the preset monitoring period is adapted to be modified, for example, the preset monitoring period is shortened, the monitoring frequency of the water level is accelerated, and the water level change is closely concerned.
When monitoring the water level, a display can be installed near the monitored water area, as shown in fig. 2, surrounding people can be pre-warned through the display, and monitoring data can be stored to the cloud through GSM (Global System for Mobile Communications, global system for mobile communication). As shown in fig. 8, if the current water level difference h is smaller than the preset water level difference c, the display is turned off. And if the current water level difference h is larger than the preset water level difference c, displaying the current water level. If the water level does not rise continuously, the timer time interval is modified to be 5 minutes. If the water level continuously rises and the rising speed is not greater than the preset water level rising speed d, the time interval of the timer is modified to be 1 minute. If the water level rising speed is greater than the preset water level rising speed d, carrying out flood warning.
Specifically, the signal emitting device and the display in this embodiment can both be provided with a solar panel to supply power, and the photovoltaic cell in the solar panel converts photons in sunlight into current through the photovoltaic effect, and when electrons strike the surface of the battery, the electrons are released to generate current to supply power. The solar panel is used for self-supply of the circuit, so that the requirements of the signal transmitting device and the display on the environment are greatly reduced, and the applicability is improved.
According to the water level change monitoring method provided by the embodiment, the current water level value, whether the water level continuously rises or not and the water level rising speed are monitored, and early warning information is generated to remind surrounding people or modify a preset monitoring period so as to speed up monitoring frequency or reduce monitoring frequency.
In this embodiment, a water level change monitoring device is further provided, and the device is used to implement the foregoing embodiments and preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
As a specific application embodiment of the present invention, as shown in FIG. 2, the calibration mode is first entered, the millimeter wave radar is utilized to transmit signals, and when receiving echo signals, signal processing is performed to obtain the reference water level value h 1 . And then entering a working mode, transmitting signals by utilizing the millimeter wave radar, and when receiving echo signals, performing signal processing to measure the water level height change, displaying by utilizing a display screen and uploading the measurement result to the cloud.
The present embodiment provides a water level change monitoring device, as shown in fig. 9, including:
the acquisition module 901 is configured to acquire a reference echo signal and a current echo signal returned by the monitoring water area, where the reference echo signal is an echo signal returned by the monitoring water area after receiving the reference radar signal transmitted by the signal transmitting device, and the current echo signal is an echo signal returned by the monitoring water area after receiving the current radar signal transmitted by the signal transmitting device.
The signal processing module 902 is configured to perform signal mixing processing on the reference echo signal and the current echo signal, to obtain a beat signal, where the beat signal includes the reference beat signal and the current beat signal.
The calculating module 903 is configured to perform fourier transform on the beat signal, calculate a relative distance between the signal transmitting device and the water surface of the monitored water area based on the signal after fourier transform, and calculate a water level value based on the relative distance and the relative angle, where the water level value includes a reference water level value and a current water level value.
And the monitoring module 904 is used for comparing the reference water level value with the current water level value to obtain a water level change monitoring result of the monitored water area.
In some alternative embodiments, the computing module 903 includes:
a first calculation unit for extracting a time difference between a signal transmission time of the signal transmission device and a signal reception time of the monitoring water area from the fourier transformed signal.
And the second calculating unit is used for calculating the relative distance between the signal transmitting device and the water surface of the monitored water area according to the time difference.
And the third calculation unit is used for extracting echo signals with different phases received by the signal transmitting device from the signals after Fourier transformation, and calculating the relative angles of the signal transmitting device and the water surface of the monitored water area according to the echo signals with different phases.
And the fourth calculation unit is used for calculating the water level value according to the relative distance between the signal transmitting device and the water surface of the monitored water area and the relative angle between the signal transmitting device and the water surface of the monitored water area.
In some alternative embodiments, the first computing unit includes:
and the determining subunit is used for determining a spectrogram corresponding to the signal after Fourier transformation.
The first extraction subunit is used for extracting amplitude frequency characteristics in the spectrogram to obtain the amplitude frequency spectrum of the beat frequency signal.
And the first calculating subunit is used for extracting a first peak frequency range of the amplitude from the amplitude spectrum and calculating the time difference between the signal transmitting time of the signal transmitting device and the signal receiving time of the monitoring water area according to the spectrogram in the first peak frequency range.
In some alternative embodiments, the first computing subunit comprises:
and the second extraction subunit performs secondary Fourier transform on the signals in the first peak frequency range and extracts spectrograms in the second peak frequency range from the signals subjected to secondary Fourier transform.
And the second calculating subunit is used for calculating the time difference between the signal transmitting time of the signal transmitting device and the signal receiving time of the monitoring water area according to the spectrogram in the second peak frequency range.
In some alternative embodiments, the apparatus further comprises:
and the first determining module is used for determining the difference value between the current water level value and the reference water level value as the current water level difference.
The signal acquisition module is used for acquiring a reference echo signal and a current echo signal returned by the monitored water area in a preset monitoring period.
The second determining module is used for determining a water level value in a preset monitoring period according to the reference echo signal and the current echo signal returned in the preset monitoring period, and determining a change value of the water level difference based on a difference value between the water level value and the reference water level value in the preset monitoring period.
And the early warning module is used for generating early warning information according to the current water level difference and the change value of the water level difference and carrying out early warning according to the early warning information.
In some alternative embodiments, the early warning module includes:
the first comparison unit is used for acquiring a preset water level difference and comparing the current water level difference with the preset water level difference.
And the judging unit is used for judging whether the water level continuously rises according to the change value of the water level difference if the current water level difference is larger than the preset water level difference.
And the determining unit is used for determining the water level rising speed according to the division result of the change value of the water level difference and the preset monitoring period if the current water level continuously rises.
And the second comparison unit is used for acquiring the preset water level rising speed and comparing the water level rising speed with the preset water level rising speed.
And the generation unit is used for generating early warning information if the water level rising speed is greater than the preset water level rising speed.
And the modification unit is used for modifying the preset monitoring period if the current water level difference is larger than the preset water level difference and the current water level does not continuously rise, or if the current water level difference is larger than the preset water level difference and the current water level continuously rises and the water level rising speed is not larger than the preset water level rising speed.
And the re-acquisition unit is used for re-acquiring the reference echo signal and the current echo signal returned by the monitored water area every other modified preset monitoring period.
Further functional descriptions of the above respective modules and units are the same as those of the above corresponding embodiments, and are not repeated here.
The water level change monitoring device in this embodiment is presented in the form of a functional unit, here an ASIC (Application Specific Integrated Circuit ) circuit, a processor and a memory executing one or more software or fixed programs, and/or other devices that can provide the above-described functions.
The embodiment of the invention also provides computer equipment, which is provided with the water level change monitoring device shown in the figure 9.
Referring to fig. 10, fig. 10 is a schematic structural diagram of a computer device according to an alternative embodiment of the present invention, as shown in fig. 10, the computer device includes: one or more processors 10, memory 20, and interfaces for connecting the various components, including high-speed interfaces and low-speed interfaces. The various components are communicatively coupled to each other using different buses and may be mounted on a common motherboard or in other manners as desired. The processor may process instructions executing within the computer device, including instructions stored in or on memory to display graphical information of the GUI on an external input/output device, such as a display device coupled to the interface. In some alternative embodiments, multiple processors and/or multiple buses may be used, if desired, along with multiple memories and multiple memories. Also, multiple computer devices may be connected, each providing a portion of the necessary operations (e.g., as a server array, a set of blade servers, or a multiprocessor system). One processor 10 is illustrated in fig. 10.
The processor 10 may be a central processor, a network processor, or a combination thereof. The processor 10 may further include a hardware chip, among others. The hardware chip may be an application specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general-purpose array logic, or any combination thereof.
Wherein the memory 20 stores instructions executable by the at least one processor 10 to cause the at least one processor 10 to perform a method for implementing the embodiments described above.
The memory 20 may include a storage program area that may store an operating system, at least one application program required for functions, and a storage data area; the storage data area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, memory 20 may optionally include memory located remotely from processor 10, which may be connected to the computer device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk, or solid state disk; the memory 20 may also comprise a combination of the above types of memories.
The computer device further comprises input means 30 and output means 40. The processor 10, memory 20, input device 30, and output device 40 may be connected by a bus or other means, for example in fig. 10.
The input means 30 may receive input numeric or character information and generate key signal inputs related to user settings and function control of the computer device, such as a touch screen or the like. The output means 40 may comprise a display device or the like.
The embodiments of the present invention also provide a computer readable storage medium, and the method according to the embodiments of the present invention described above may be implemented in hardware, firmware, or as a computer code which may be recorded on a storage medium, or as original stored in a remote storage medium or a non-transitory machine readable storage medium downloaded through a network and to be stored in a local storage medium, so that the method described herein may be stored on such software process on a storage medium using a general purpose computer, a special purpose processor, or programmable or special purpose hardware. The storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, a solid state disk or the like; further, the storage medium may also comprise a combination of memories of the kind described above. It will be appreciated that a computer, processor, microprocessor controller or programmable hardware includes a storage element that can store or receive software or computer code that, when accessed and executed by the computer, processor or hardware, implements the methods illustrated by the above embodiments.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (10)
1. A water level change monitoring method, the method comprising:
acquiring a reference echo signal and a current echo signal returned by a monitoring water area, wherein the reference echo signal is an echo signal returned by the monitoring water area after receiving a reference radar signal transmitted by a signal transmitting device, and the current echo signal is an echo signal returned by the monitoring water area after receiving the current radar signal transmitted by the signal transmitting device;
respectively carrying out signal mixing processing on the reference echo signal and the current echo signal to obtain beat frequency signals, wherein the beat frequency signals comprise a reference beat frequency signal and a current beat frequency signal;
performing Fourier transform on the beat frequency signals, calculating the relative distance between the signal transmitting device and the water surface of the monitored water area and the relative angle between the signal transmitting device and the water surface of the monitored water area based on the signals after the Fourier transform, and calculating a water level value based on the relative distance and the relative angle, wherein the water level value comprises a reference water level value and a current water level value;
And comparing the reference water level value with the current water level value to obtain a water level change monitoring result of the monitored water area.
2. The method of claim 1, wherein calculating the relative distance between the signal emitting device and the surface of the monitored water and the relative angle between the signal emitting device and the surface of the monitored water based on the fourier transformed signals comprises:
extracting a time difference between the signal transmitting time of the signal transmitting device and the signal receiving time of the monitoring water area from the signals after the Fourier transformation;
according to the time difference, calculating the relative distance between the signal transmitting device and the water surface of the monitored water area;
extracting echo signals with different phases received by a signal transmitting device from the signals after Fourier transformation, and calculating the relative angles between the signal transmitting device and the water surface of the monitored water area according to the echo signals with different phases;
and calculating a water level value according to the relative distance between the signal transmitting device and the water surface of the monitored water area and the relative angle between the signal transmitting device and the water surface of the monitored water area.
3. The method of claim 2, wherein the water level value is calculated according to the formula:
h 1 ＝d 1 cosα 1
Wherein h is 1 D is the reference water level value 1 Alpha is the relative distance between the time of transmitting the reference radar to the signal transmitting device and the water surface of the monitored water area 1 The relative angle between the time of transmitting the reference radar for the signal transmitting device and the water surface of the monitored water area;
h 2 ＝d 2 cosα 2
wherein h is 2 D is the current water level value 2 Alpha is the relative distance between the current radar and the water surface of the monitored water area transmitted by the signal transmitting device 2 The relative angle between the current radar and the water surface of the monitored water area is transmitted by the signal transmitting device.
4. The method of claim 2, wherein extracting the time difference between the signal transmission time of the signal transmission device and the signal reception time of the monitoring water area from the fourier transformed signal comprises:
determining a spectrogram corresponding to the signals after Fourier transformation;
extracting amplitude frequency characteristics in the spectrogram to obtain an amplitude frequency spectrum of the beat frequency signal;
extracting a first peak frequency range of amplitude from the amplitude spectrum;
performing secondary Fourier transform on the signals in the first peak frequency range, and extracting a spectrogram in a second peak frequency range from the signals subjected to secondary Fourier transform;
and calculating the time difference between the signal transmitting time of the signal transmitting device and the signal receiving time of the monitored water area according to the spectrogram in the second peak frequency range.
5. The method of claim 1, wherein after comparing the reference water level value with the current water level value to obtain a water level change monitoring result of the monitored water area, the method further comprises:
determining the difference value between the current water level value and the reference water level value as the current water level difference;
acquiring a reference echo signal and a current echo signal returned by a monitoring water area in a preset monitoring period;
determining a water level value in a preset monitoring period according to a reference echo signal and a current echo signal returned in the preset monitoring period, and determining a change value of a water level difference based on a difference value between the water level value in the preset monitoring period and the reference water level value;
generating early warning information according to the current water level difference and the change value of the water level difference, and carrying out early warning according to the early warning information.
6. The method of claim 5, wherein generating the pre-warning information based on the current water head and the change in the water head comprises:
acquiring a preset water level difference, and comparing the current water level difference with the preset water level difference;
if the current water level difference is larger than the preset water level difference, judging whether the water level continuously rises or not according to the change value of the water level difference;
If the current water level continuously rises, determining the water level rising speed according to the division result of the change value of the water level difference and the preset monitoring period;
acquiring a preset water level rising speed, and comparing the water level rising speed with the preset water level rising speed;
and if the water level rising speed is greater than the preset water level rising speed, generating early warning information.
7. The method of claim 6, wherein the method further comprises:
if the current water level difference is larger than the preset water level difference and the current water level does not continuously rise, or if the current water level difference is larger than the preset water level difference and the current water level continuously rises and the water level rising speed is not larger than the preset water level rising speed, modifying a preset monitoring period;
and re-acquiring the reference echo signal and the current echo signal returned by the monitored water area every other modified preset monitoring period.
8. A water level change monitoring device, the device comprising:
the acquisition module is used for acquiring a reference echo signal and a current echo signal returned by the monitoring water area, wherein the reference echo signal is an echo signal returned by the monitoring water area after receiving the reference radar signal transmitted by the signal transmitting device, and the current echo signal is an echo signal returned by the monitoring water area after receiving the current radar signal transmitted by the signal transmitting device;
The signal processing module is used for respectively carrying out signal mixing processing on the reference echo signal and the current echo signal to obtain beat signals, wherein the beat signals comprise a reference beat signal and a current beat signal;
the calculation module is used for carrying out Fourier transform on the beat frequency signals, calculating the relative distance between the signal transmitting device and the water surface of the monitored water area and the relative angle between the signal transmitting device and the water surface of the monitored water area based on the signals after the Fourier transform, and calculating a water level value based on the relative distance and the relative angle, wherein the water level value comprises a reference water level value and a current water level value;
and the monitoring module is used for comparing the reference water level value with the current water level value to obtain a water level change monitoring result of the monitored water area.
9. A computer device, comprising:
a memory and a processor, the memory and the processor being communicatively connected to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the water level change monitoring method of any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon computer instructions for causing a computer to execute the water level change monitoring method according to any one of claims 1 to 7.
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