CN116793312A - Wireless data transmission type sea wave height measuring device and measuring method - Google Patents
Wireless data transmission type sea wave height measuring device and measuring method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000005540 biological transmission Effects 0.000 title claims abstract description 13
- 230000001133 acceleration Effects 0.000 claims abstract description 130
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 23
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000013535 sea water Substances 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims abstract description 5
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- G01C13/00—Surveying specially adapted to open water, e.g. sea, lake, river or canal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B22/00—Buoys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B22/00—Buoys
- B63B22/22—Inflatable buoys with gas generating means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
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Abstract
The invention discloses a wireless data transmission type sea wave height measuring device and a measuring method, which mainly solve the problem of high cost of the existing sea wave height measuring equipment. The device comprises a buoy part and a measuring part, wherein the buoy part and the measuring part are fixed into a whole, the buoy part comprises a liquid sensing circuit, an electromagnetic valve, a high-pressure carbon dioxide cabin and an air sac, the electromagnetic valve is opened after a liquid level sensor contacts seawater, and carbon dioxide gas rushes into the air sac to float on the sea surface; the measuring component comprises an acceleration sensor, a data processor, a voice conversion chip, an ultrashort wave transmitter, a power amplifying circuit, an antenna and a power supply. The measuring component collects sea wave acceleration data under the state that the buoy component keeps stable motion, calculates the sea wave height, converts the sea wave height into voice frequency modulation signals, and transmits the voice frequency modulation signals to the sea surface to be used for a pilot to listen to voice broadcasting of the sea wave height. The device has the advantages of small volume, light weight and low measurement cost, and can be used for guaranteeing the safe take-off and landing of the aircraft on the water surface.
Description
Technical Field
The invention belongs to the technical field of sea wave height measurement, and particularly relates to a sea wave height measurement device and a sea wave height measurement method, which are used for measuring sea wave heights below an airplane in real time by a water plane and guaranteeing the safety of taking off and landing of the airplane on the water surface.
Background
The novel large-scale seaplane is mainly used for tasks such as patrol, replenishment, rescue and the like on the sea, when the novel large-scale seaplane is used for executing the tasks on the sea, due to the lack of effective detection means for sea condition information, the situation that sea condition is complex and sea wave height is too high, the airplane can not take off and land or land on the sea surface, the flight safety of the airplane and the execution of the tasks are seriously influenced, and therefore, the seaplane needs to be provided with equipment for measuring sea wave height.
The sea wave height can be measured through the buoy, wang Yazhou and Li Zhongjun of the Shandong national academy of sciences marine instrumentation institute have published an article on the Shandong scientific journal, and an SBF3-1 type wave buoy body structure design is disclosed, an azimuth sensor is installed in the buoy, and the sensor can only work normally in a non-magnetic environment, so that the buoy must be made of a non-magnetic material. The buoy body is a glass fiber reinforced plastic sphere with a double-layer structure consisting of an inner shell and an outer shell, the diameter of the glass fiber reinforced plastic sphere is 900mm, polyurethane foam is filled between the two layers to increase the sinking resistance of the buoy, and the weight of the whole sphere is 125Kg. The whole buoy body is divided into a top cover, a flange plate, a glass fiber reinforced plastic ball body, a ballast and a mooring plate from top to bottom, and the specific structure of the buoy body is shown in figure 1. Wherein the top cover is a steel disc with the diameter of 400mm and the thickness of 10 mm; the flange plate is a copper disc with an outer diameter of 400mm and an inner diameter of 300 mm.
The sea wave height can be measured by a sea wave height measuring radar carried on an aircraft, and a patent document of application number 200910017953.8 of the national academy of sciences of China, which is the application number of ocean research, discloses a dual-polarized X-band radar sea wave parameter measuring system, wherein the radar consists of a radar host and a dual-polarized antenna which is in communication connection with the radar host; the radar host is connected with a data acquisition module of the computer, and video signals output by the radar are converted into digital signals through the data acquisition module and stored in a storage unit of the computer; the computer is connected with the polarization switching control module through the I/O interface, and is in control connection with the dual-polarized antenna through the polarization switching control module; one end of the dual-polarized antenna is in communication connection with the radar host, and the other end of the dual-polarized antenna is connected with the polarization switching control module to provide sea wave height information in an all-weather, real-time, efficient and accurate manner.
The biggest problems in the prior art are large volume, heavy weight and high cost, wherein the market price of the sea wave height measurement radar is hundreds of thousands yuan, and the price of the sea wave buoy is hundreds of thousands yuan, so that the market needs to be replaced by a lightweight low-cost product.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a wireless data transmission type ocean wave height measuring device, so that the volume and weight of the measuring device are reduced, and the measuring cost is greatly reduced.
The technical scheme of the invention is realized as follows:
1. the utility model provides a wireless data transmission sea wave height measuring device, includes buoy part 1 and measuring part 2, and both are fixed as an organic wholely, its characterized in that:
the buoy part 1 comprises a liquid sensing circuit 11, an electromagnetic valve 12, a high-pressure carbon dioxide cabin 13 and an air bag 14, wherein the air bag 14 is positioned above the high-pressure carbon dioxide cabin 13, and the electromagnetic valve 12 is positioned between the two and is electrically connected with the liquid sensing circuit; the high-pressure carbon dioxide cabin 13 is filled with high-pressure carbon dioxide gas, when the liquid level sensor contacts sea water, the electromagnetic valve 12 is opened, and the carbon dioxide gas is flushed into the air bag 14, so that the carbon dioxide gas rapidly expands and floats on the sea surface and moves along with the fluctuation of sea waves;
the measuring part 2 adopts an integral structure which comprises an acceleration sensor 21, a data processor 22, a voice conversion chip 23, an ultrashort wave transmitter 24, a power amplifying circuit 25, an antenna 26 and a power module 27 which are integrated together, so that the volume and the weight of the device are reduced, and the reliability of the device is improved; the acceleration sensor 21, the data processor 22, the voice conversion chip 23, the ultrashort wave transmitter 24, the power amplification circuit 25 and the antenna 26 are sequentially cascaded to process the acceleration signal of the sea wave acquired by the acceleration sensor, and the data processor is used for controlling the frequency adjustment to acquire the sea wave height.
Further, the liquid sensing circuit 11 is formed by connecting a power amplifier circuit 111 and a liquid level sensor 112, and the liquid level sensor 112 generates a standard electric signal after contacting seawater and transmits the standard electric signal to the power amplifier circuit 111 for amplification, and then the electromagnetic valve 12 is triggered to be opened.
Further, the data processor 22 includes:
the control submodule is used for setting the working mode and frequency of the ultrashort wave transmitter, writing working mode and frequency data into the ultrashort wave transmitter through an IIC bus, namely, setting the frequency of the ultrashort wave transmitter by using a HS6760_Fre () function, setting the working mode of the ultrashort wave transmitter by using a HS6760_SetMode () function, writing setting data of the two functions into the ultrashort wave transmitter byte by byte through the IIC_WriteOneByte () function, and writing one byte of data into a fixed address through the IIC bus;
the calculating sub-module is used for receiving the acceleration data of the acceleration sensor, calculating the sea wave height according to the acceleration data, namely, adopting a SeaWaveheight_process () function to perform curve fitting on the sea wave acceleration data, and then obtaining the sea wave height according to a fitting curve.
Further, the power module 27 is connected to the liquid sensing circuit 11, the acceleration sensor 21, the voice conversion chip 23, the ultrashort wave transmitter 24, and the power amplifying circuit 25, respectively, to supply power thereto.
Further, the antenna 26 is a helical antenna with a height not greater than 10cm, and is configured to receive and transmit the amplified voice fm signal.
Further, the main chip of the ultrashort wave transmitter 24 is HS6760M, and the size thereof is: 3 x 0.95mm, supporting line-in input and direct MIC input, wherein the working modes comprise a normal emission mode, a sleep mode and a static mode, and the frequency is 27-125 MHz; the input reference clock supports three crystal oscillators of 7.6MHz/12MHz/24MHz, the transmitting power is more than 10dBm, the ultrashort wave transmitter receives an externally input control signal, generates a carrier signal, modulates a voice signal on the carrier to obtain a voice frequency modulation signal, and transmits the voice frequency modulation signal to the power amplifying circuit.
2. The method for measuring the height of the wireless transmission sea wave by using the device is characterized by comprising the following steps of:
1) Setting the transmitting frequency and the working mode of the ultrashort wave transmitter 24;
2) Real-time acceleration data of sea waves are acquired by using an acceleration sensor 21, the acceleration data are sent to a data processor 22 through an IIC bus, and a sea wave acceleration curve a is fitted to the sea wave acceleration through FFT operation according to the principle that the vertical acceleration change of one particle on the water surface is similar to a sine curve S ；
3) According to the fitted curve a S Determining sea wave height S P-P ；
4) The voice conversion chip 23 is used for synthesizing the sea wave height text into a voice signal and outputting the voice signal;
5) The ultrashort wave transmitter 24 receives the voice signal, generates a carrier signal according to the control signal transmitted by the IIC bus, modulates the frequency of the voice signal to obtain a voice frequency modulation signal, transmits the voice frequency modulation signal to the power amplification circuit 25 for power amplification, and transmits the amplified voice frequency modulation signal to the upper air of the sea surface through the antenna 26 for being received by an ultrashort wave radio station on the aircraft, so that a pilot listens to real-time voice broadcasting information of the sea wave height.
Compared with the prior art, the invention has the following advantages:
1. the buoy part of the invention provides the buoyancy of the device and keeps the device stable in movement by adopting the form of filling the carbon dioxide gas into the air bag, replaces the prior SBF3-1 wave buoy and adopts a method of obtaining the buoyancy by draining water in a large volume by adopting a glass steel ball body, so that the whole device has light weight, and the air bag is in a compressed state in a non-working state, and has very small volume; meanwhile, as the compressed carbon dioxide occupies small volume, the cost is low, the weight is light, the manufacturing cost of the wireless data transmission sea wave height measuring device is greatly reduced, the weight of the device is reduced, and the small volume, the light weight and the low cost are realized;
2. the invention adopts the mode of transmitting the voice signal by ultrashort waves, and transmits the voice frequency modulation signal after power amplification to the upper air of the sea surface through the antenna so as to be received by an ultrashort wave radio station on the aircraft, thereby being capable of realizing real-time listening to the sea wave height information on the aircraft and being convenient for pilots to execute tasks.
3. Compared with the existing hundreds of thousands of yuan wave height measuring radar and hundreds of thousands of yuan wave buoy, the device provided by the invention has the advantage that the total cost is not more than 5000 yuan, and the device is saved by hundreds of thousands of yuan.
4. The device is mainly used for scattering from the aircraft during sea rescue so as to measure the sea wave height of the rescue site in real time, and the device does not need to be salvaged and recovered after the scattering at sea, so that the workload of the aircraft in executing tasks at sea is reduced.
Drawings
FIG. 1 is a diagram of a prior art SBF3-1 wave buoy body structure;
FIG. 2 is a schematic view of the structure of the device of the present invention;
FIG. 3 is a schematic diagram of a float assembly according to the present invention;
FIG. 4 is a schematic diagram of the measuring components of the present invention;
FIG. 5 is a flow chart of an implementation of the invention for measuring sea wave height.
Detailed Description
Embodiments and effects of the present invention are described in further detail below with reference to the accompanying drawings.
Referring to fig. 2, the wireless data transmission sea wave height measuring device of the present example includes a buoy member 1 and a measuring member 2, which are fixed as one body. When the whole device is immersed in water, the air bags of the buoy component are inflated to expand to drive the whole device to move on the water surface along with wave fluctuation, the measuring component 2 acquires acceleration data of the wave along with the movement of the device, the acceleration data are stored, calculated, converted into voice, modulated, amplified in power and transmitted, and a pilot listens to the voice broadcasting information of the wave height through an ultra-short wave radio station on an airplane.
Referring to fig. 3, the buoy member 1 comprises a liquid sensing circuit 11, an electromagnetic valve 12, a high-pressure carbon dioxide chamber 13 and an air bag 14, wherein the liquid sensing circuit 11 comprises a liquid level sensor 112 and a power amplifier circuit 111; the air bag 14 is positioned above the high-pressure carbon dioxide cabin 13, and the electromagnetic valve 12 is positioned between the air bag 14 and the high-pressure carbon dioxide cabin and is electrically connected with the liquid sensing circuit; the high-pressure carbon dioxide cabin 13 is filled with high-pressure carbon dioxide gas; when the liquid level sensor 112 contacts the sea water, a standard electric signal is generated, the electric signal is transmitted to the power amplifier circuit 111 for amplification, the amplified electric signal is transmitted to the electromagnetic valve 12, the valve is opened, the air pressure in the high-pressure carbon dioxide cabin is larger than that of the air bag, and the carbon dioxide gas is filled into the air bag 14 through the electromagnetic valve, so that the carbon dioxide gas rapidly expands and floats on the sea surface and moves along with the fluctuation of sea waves.
Referring to fig. 4, the measuring part 2 includes an acceleration sensor 21, a data processor 22, a voice conversion chip 23, an ultrashort wave transmitter 24, a power amplifying circuit 25, an antenna 26, and a power module 27. The acceleration sensor 21, the data processor 22, the voice conversion chip 23, the ultrashort wave transmitter 24, the power amplification circuit 25 and the antenna 26 are sequentially cascaded, and the power module 27 is respectively connected with the power amplification circuit 111, the acceleration sensor 21, the voice conversion chip 23, the ultrashort wave transmitter 24 and the power amplification circuit 25 to supply power to the same. The acceleration sensor 21 transmits the collected acceleration data to the data processor 22 through the IIC bus for storage and calculation, firstly, a sea wave acceleration curve is obtained, then the sea wave acceleration curve is calculated to obtain sea wave height data, the sea wave height data are transmitted to the voice conversion chip 23 through the serial port and are converted into voice signals, the voice signals are transmitted to the ultrashort wave transmitter 24 for frequency modulation to obtain voice frequency modulation signals, the voice frequency modulation signals are transmitted to the power amplification circuit 25 for power amplification, and the amplified voice frequency modulation signals are transmitted to the antenna 26 for transmission to the upper air of the sea surface.
The acceleration sensor 21 is used for acquiring the sea wave acceleration, and the sea wave acceleration data of the water surface where the acquisition device is located are transmitted to the data processor 22 through the IIC bus;
the data processor 22 performs frequency adjustment control on the ultrashort wave transmitter 24 through the IIC bus, so that the ultrashort wave transmitter generates carrier signals of corresponding frequency bands; the data processor 22 receives acceleration data transmitted by the acceleration sensor, and stores and calculates the acceleration data; performing FFT operation on the sea wave acceleration data, taking a minimum frequency value except 0 frequency, which is approximate to the sea wave acceleration frequency f, and fitting an acceleration curve a by using a least square method S The method comprises the steps of carrying out a first treatment on the surface of the And then pair a S Performing double integration on time to obtain wave height data, transmitting the wave height data to a voice conversion chip 23 through an RS232 bus, converting the wave height data into voice signals by the voice conversion chip 23, transmitting the voice signals to an ultrashort wave transmitter 24, modulating the voice signals by the ultrashort wave transmitter 24 in a frequency modulation mode to obtain frequency modulation signals, transmitting the frequency modulation signals to a power amplification circuit 25 for amplification, and transmitting the amplified frequency modulation signals to an antenna for transmission; and the ultra-short wave radio station is adjusted to the corresponding frequency on the aircraft, so that voice broadcasting information of the sea wave height can be received.
The data processing module 22 includes a control sub-module and a calculation sub-module, wherein: the control submodule is used for setting the working mode and frequency of the ultrashort wave transmitter, writing working mode and frequency data into the ultrashort wave transmitter through an IIC bus, namely, setting the frequency of the ultrashort wave transmitter by using a HS6760_Fre () function, setting the working mode of the ultrashort wave transmitter by using a HS6760_SetMode () function, writing setting data of the two functions into the ultrashort wave transmitter byte by byte through the IIC_WriteOneByte () function, and writing one byte of data into a fixed address through the IIC bus; the calculating sub-module is used for receiving the acceleration data of the acceleration sensor, calculating the sea wave height according to the acceleration data, namely, adopting a SeaWaveheight_process () function to perform curve fitting on the sea wave acceleration data, and then obtaining the sea wave height according to a fitting curve. The UART_Transmit () function of the calculation sub-module transmits the sea wave height data to the voice chip through the serial port.
The voice conversion chip 23 is, but not limited to, a chip with the model XFS3031CNP, and its external dimension is 10×10×1.4mm. The chip converts the sea wave height data transmitted by the data processor 22 into a voice signal that is transmitted to the ultrashort wave transmitter 24.
The ultrashort wave transmitter 24 uses, but is not limited to, a chip with a main chip of HS6760M, and has the following dimensions: 3 x 0.95mm, supporting line-in input and direct MIC input, wherein the working modes of the chip comprise a normal emission mode, a sleep mode and a static mode, and the frequency is 27-125 MHz; the input reference clock supports three crystal oscillators of 7.6MHz/12MHz/24MHz, the transmitting power is more than 10dBm, the ultrashort wave transmitter receives an externally input control signal, generates a carrier signal, modulates a voice signal on the carrier to obtain a voice frequency modulation signal, and transmits the voice frequency modulation signal to the power amplifying circuit.
The power amplifying circuit 25 adopts, but is not limited to, a chip with model TDA1521, and an audio power amplifying chip with low distortion and high stability, and has an operating voltage of ±16v, an impedance of 8 ohms, an output power of 30 watts, and a distortion ratio of not more than 0.5%, and is used for amplifying the voice fm signal transmitted by the ultrashort wave transmitter 24.
The antenna 26 adopts, but is not limited to, a spiral antenna with the height not more than 10cm, and the antenna gain is not less than 3.5dBi; and the device is used for receiving the amplified voice frequency modulation signal and transmitting the voice frequency modulation signal.
The working time of the power module 27 is as follows: 2-12 h.
Referring to fig. 5, the method for measuring sea wave height by using the above device through wireless data transmission is to approximate a sinusoidal curve according to the vertical acceleration change of one particle on the water surface, obtain the sea wave acceleration frequency f from the sea wave acceleration data through FFT operation, and then fit the sea wave acceleration curve by using the least square method, and the implementation steps are as follows:
step 1, setting an operating mode and a transmitting frequency of an ultrashort wave transmitter.
And the control submodule is used for setting the frequency of the ultrashort wave transmitter by using a H6760_Fre () function and setting the working mode of the ultrashort wave transmitter by using a H6760_SetMode () function.
And step 2, simplifying the formula of the sea wave acceleration curve.
The real-time acceleration data of sea waves are acquired by using the acceleration sensor 21, the acceleration data are sent to the data processor 22 through the IIC bus, and the sea wave acceleration curve is obtained to be approximate to a sine curve according to the principle that the vertical acceleration change of one particle on the water surface is approximate to the sine curve, and the expression formula is as follows:
wherein A is the average amplitude of the wave acceleration, f is the frequency of the wave acceleration,for the initial phase of the wave acceleration, A 1 Is the DC component of the sea wave acceleration;
the acceleration sensor 21 is used for acquiring real-time acceleration data of the sea wave, the acceleration data are sent to the data processor 22 through the IIC bus, the sea wave acceleration data are acquired in real time, the average value is calculated, and the sea wave acceleration data at each moment are subtracted by the average value, so that the direct current component A of the sea wave acceleration curve 1 And the formula of the simplified wave acceleration curve is zero, and the formula of the simplified wave acceleration curve is as follows:
a＝Acos(2πft+φ)。
step 3, solving the maximum value a of the sea wave acceleration data max The parameter f in the curve formula is determined.
The data processor compares all the received wave acceleration data by using MAX function and takes out the maximum value a max ；
And carrying out FFT operation on all wave acceleration data, and obtaining an approximate acceleration main frequency f by taking the minimum frequency except 0 frequency.
Step 4, determining the parameter A in the curve formula,
The curve fitted by using least square method is characterized by that the actual data points are all positioned at the position far from above or below said curve, and said curve can not only reflect the total distribution of data, but also can not produce local large fluctuation, so that the deviation of the obtained function and known function can be approximate to known function.
The step takes f as the center according to the characteristics of the curve fitted by the least square method, and takes [ f-delta f, f+delta f]，Fitting the acceleration curve in the range by using a least square method to obtain parameters A and +.>The specific implementation is as follows:
4.1 Calculating the mean square error value of the sea wave acceleration data:
4.1.1 At least one of the above-mentioned positions)In the range of 0.2 steps +.>Begin to give->Take the value of>At each value, the acceleration of gravity is stepped by 0.01 times, starting at 0.01g at [0, a max ]Within the range of pair A k Assignment, time t i Receiving wave acceleration data a at intervals of 25us ijk Continuously receiving 2048 sea wave acceleration data, i is more than or equal to 1 and less than or equal to 2048,1 and j is more than or equal to 31,g is gravity acceleration;
4.1.2 To (3)A 1 Starting with =0.01g, every 25us receives a wave acceleration a i11 Calculating a first group of theoretical values a 'of the wave acceleration according to a wave acceleration curve formula' i11 ＝0.01gcos(2πft i )；
4.1.3 To (3)A 2 Starting with =0.02g, one wave acceleration a is measured every 25us i12 Calculating a second group of theoretical values a 'of the wave acceleration according to the wave acceleration curve formula' i12 ＝0.02gcos(2πft i ) This calculation is looped until A k ＝a max
4.1.4 To (3)A 1 Starting with =0.01g, every 25us receives a wave acceleration a i21 Calculating a group of theoretical values a 'of the wave acceleration according to a wave acceleration curve formula' i21 ＝0.01gcos(2πft i +0.2)；
4.1.5 To (3)A 2 Starting with =0.02g, every 25us receives a wave acceleration a i22 Calculating a group of theoretical values a 'of the wave acceleration according to a wave acceleration curve formula' i22 ＝0.02gcos(2πft i +0.2), loop this calculation until A k ＝a max ；
4.1.6)Increasing from 0 to 2 pi in steps of 0.2, in each given +.>Next, give A k Assigning values, starting from 0.01g, increasing in steps of 0.01g until a max In each->Value sum A k With a combination of values, time t i Receiving 2048 sea wave acceleration data at 25us intervals, and taking different +.>Value and theoretical value a 'at different A values' ijk Performing calculation to calculate ∈>Theoretical value a' ijk Wherein
4.1.7 Calculating the time period according to the mean square error formulaM mean square error values within seconds +.>Wherein pi is about 3.14, g is about 9.8m/s 2 ；
4.2 Extracting the wave acceleration amplitude A corresponding to the minimum mean square error value from all the calculated mean square error values S And initial phaseValues as parameters A and +.sub.in the wave acceleration curve formula, respectively>Is a value of (2).
And 5, fitting an acceleration curve.
According to the frequency f obtained by FFT operation and the wave acceleration amplitude A obtained by least square method S And initial phaseValues are fitted to a period of 16.4a max Wave acceleration profile in seconds: />
Step 6, solving the sea wave height S according to the fitting curve P-P 。
6.1 For sea wave acceleration curve a S And (3) performing double integration on time t to obtain an ocean wave displacement curve S:
wherein f is the frequency obtained by FFT operation of the sea wave acceleration data, A S Andthe wave acceleration amplitude and the initial phase value obtained by the least square method are respectively;
6.2 Instruction) commandAnd 1, respectively obtaining the maximum value +.>And minimum->
6.3 According to S max And S is min Obtaining the sea wave height S P-P ：
And 7, processing the sea wave height data into voice frequency modulation signals and transmitting the voice frequency modulation signals to the sea surface sky.
The calculation sub-module organizes the obtained sea wave height data into voice broadcasting data, and transmits the voice broadcasting data to the voice conversion chip HS6760M;
the voice chip converts the received voice broadcasting data into voice signals and transmits the voice signals to the ultrashort wave transmitter;
the control submodule controls the ultrashort wave transmitter to generate carrier frequency through the IIC bus, and the ultrashort wave transmitter carries out frequency modulation on the voice signal to obtain a voice frequency modulation signal and transmits the voice frequency modulation signal to the power amplifying circuit;
the power amplification circuit performs power amplification on the voice frequency modulation signal to obtain an amplified voice frequency modulation signal;
the amplified voice audio signal is transmitted to the upper air of the sea surface through a spiral antenna;
the pilot can receive voice broadcasting information of sea wave height by adjusting an ultra-short wave radio station on the aircraft to corresponding frequency above the sea surface.
The foregoing description is only one specific example of the invention and is not intended to limit the invention in any way, and it will be apparent to those skilled in the art that various modifications and changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The utility model provides a wireless data transmission formula wave height measuring device, includes buoy part (1) and measuring part (2), and both are fixed as an organic wholely, its characterized in that:
the buoy component (1) comprises a liquid sensing circuit (11), an electromagnetic valve (12), a high-pressure carbon dioxide cabin (13) and an air bag (14), wherein the air bag (14) is positioned above the high-pressure carbon dioxide cabin (13), and the electromagnetic valve (12) is positioned between the two and is electrically connected with the liquid sensing circuit; the high-pressure carbon dioxide cabin (13) is filled with high-pressure carbon dioxide gas, when the liquid level sensor contacts sea water, the electromagnetic valve (12) is opened, and the carbon dioxide gas is flushed into the air bag (14) to enable the air bag to rapidly expand and float on the sea surface and move along with the fluctuation of sea waves;
the measuring component (2) adopts an integral structure which comprises an acceleration sensor (21), a data processor (22), a voice conversion chip (23), an ultrashort wave transmitter (24), a power amplifying circuit (25), an antenna (26) and a power module (27) which are integrated together, so that the volume and the weight of the device are reduced, and the reliability of the device is improved; the sea wave height is obtained by sequentially cascading the acceleration sensor (21), the data processor (22), the voice conversion chip (23), the ultrashort wave transmitter (24), the power amplification circuit (25) and the antenna (26) so as to process the acceleration signal of sea waves acquired by the acceleration sensor and controlling frequency adjustment through the data processor.
2. The apparatus according to claim 1, wherein: the liquid sensing circuit (11) is formed by connecting a power amplification circuit (111) and a liquid level sensor (112), and the liquid level sensor (112) generates a standard electric signal after contacting seawater and transmits the standard electric signal to the power amplification circuit (111) for amplification and then triggers the electromagnetic valve (12) to be opened.
3. The apparatus according to claim 1, wherein: the data processor (22) includes:
the control submodule is used for setting the working mode and frequency of the ultrashort wave transmitter, writing working mode and frequency data into the ultrashort wave transmitter through an IIC bus, namely, setting the frequency of the ultrashort wave transmitter by using a HS6760_Fre () function, setting the working mode of the ultrashort wave transmitter by using a HS6760_SetMode () function, writing setting data of the two functions into the ultrashort wave transmitter byte by byte through the IIC_WriteOneByte () function, and writing one byte of data into a fixed address through the IIC bus;
the calculating sub-module is used for receiving the acceleration data of the acceleration sensor, calculating the sea wave height according to the acceleration data, namely, adopting a SeaWaveheight_process () function to perform curve fitting on the sea wave acceleration data, and then obtaining the sea wave height according to a fitting curve.
4. The apparatus according to claim 1, wherein: the power module (27) is respectively connected with the liquid sensing circuit (11), the acceleration sensor (21), the voice conversion chip (23), the ultrashort wave transmitter (24) and the power amplifying circuit (25) so as to supply power to the liquid sensing circuit.
5. The apparatus according to claim 1, wherein: the antenna (26) adopts a spiral antenna with the height not more than 10cm and is used for receiving the amplified voice frequency modulation signal and transmitting the voice frequency modulation signal.
6. The apparatus according to claim 1, wherein: the main chip of the ultrashort wave transmitter (24) is HS6760M, and the size is as follows: 3 x 0.95mm, supporting line-in input and direct MIC input, wherein the working modes comprise a normal emission mode, a sleep mode and a static mode, and the frequency is 27-125 MHz; the input reference clock supports three crystal oscillators of 7.6MHz/12MHz/24MHz, the transmitting power is more than 10dBm, the ultrashort wave transmitter receives an externally input control signal, generates a carrier signal, modulates a voice signal on the carrier to obtain a voice frequency modulation signal, and transmits the voice frequency modulation signal to the power amplifying circuit.
7. A method for wireless transmission of sea wave height measurements using the apparatus of claim 1, comprising the steps of:
(1) Setting the transmitting frequency and the working mode of an ultrashort wave transmitter (24);
(2) Real-time acceleration data of sea waves are acquired by using an acceleration sensor (21), the acceleration data are sent to a data processor (22) through an IIC bus, and a sea wave acceleration curve a is fitted to the sea wave acceleration through FFT operation according to the principle that the vertical acceleration change of one particle on the water surface is similar to a sine curve S ；
(3) According to the fitted curve a S Determining sea wave height S P-P ；
(4) Synthesizing the sea wave height text into a voice signal by using a voice conversion chip (23) and outputting the voice signal;
(5) The ultra-short wave transmitter (24) receives the voice signals, generates carrier signals according to the control signals transmitted by the IIC bus, modulates the frequency of the voice signals to obtain voice frequency modulation signals, transmits the voice frequency modulation signals to the power amplification circuit (25) for power amplification, and transmits the amplified voice frequency modulation signals to the upper air of the sea surface through the antenna (26) for being received by an ultra-short wave radio station on the aircraft, so that a pilot can hear real-time voice broadcasting information of the sea wave height.
8. The method of claim 7, wherein step (2) approximates a sinusoidal curve based on the vertical acceleration change of a particle on the water surface, and wherein the fitting of the wave acceleration curve to the wave acceleration by FFT is accomplished by:
(2a) The average value of the wave acceleration data obtained in real time is calculated, and the wave acceleration data at each moment is subtracted by the average value to obtain a wave acceleration curve formula:wherein A is the average amplitude of the wave acceleration, f is the frequency of the wave acceleration, ++>Is the initial phase of the wave acceleration;
(2b) Solving the maximum value a of sea wave acceleration data acquired in real time max ；
(2c) Determining parameters in a curve formula: A. f (f),
(2c1) At the position ofIn the range of 0.2 steps +.>Begin to give->Take the value, at each of which, 0.01 times the acceleration of gravity is used as the step, 0.01g is used as the starting point in [0, a ] max ]Within the range of pair A k Assignment, time t i Receiving wave acceleration data a at intervals of 25us ijk Continuously receiving 2048 sea wave acceleration data, i is more than or equal to 1 and less than or equal to 2048,1 and j is more than or equal to 31,g is gravity acceleration;
(2c2) FFT calculation is carried out on 2048 continuously received wave acceleration data to obtain wave acceleration frequency f, and different A are given by (2 c 1)Calculating theoretical value of each group of sea wave accelerations +.>Calculating a time period according to a mean square error formula>Within seconds +.>Mean square error
(2c3) Among all mean square error values calculatedExtracting the wave acceleration amplitude A corresponding to the minimum mean square error value S And initial phaseValues as parameters A and +.sub.in the wave acceleration curve formula, respectively>Is a value of (2);
(2d) Sea wave acceleration amplitude A obtained by using frequency f obtained by FFT operation and minimum mean square error method S And initial phaseValues are fitted to a period of 16.4a max Wave acceleration profile in seconds: />
9. The method of claim 7, wherein the sea level S is determined from the fitted curve in step (3) P-P The implementation is as follows:
(3a) Acceleration curve a for sea wave S And (3) performing double integration on time t to obtain an ocean wave displacement curve S:
where f is the frequency obtained by FFT operation, A S Andthe wave acceleration amplitude and the initial phase value are respectively obtained by a minimum mean square error method;
(3b) Let cos (2pi ft+phi) S ) = -1 and 1, respectively, yielding maximum values of the wave displacement curveAnd minimum->
(3c) From S max Subtracting S min The sea wave height is obtained:
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