Sea wave height measuring device and measuring method using wireless data transmission

Abstract

The application discloses a kind of wireless data transmission formula sea wave height measuring device and measuring method, mainly solve the problem of high cost of existing sea wave height measuring equipment.The device includes float component and measuring component, two are fixed as a whole, float component includes liquid level sensor circuit, electromagnetic valve, high-pressure carbon dioxide cabin and air bag air bag, liquid level sensor contacts seawater after electromagnetic valve is opened, carbon dioxide gas rushes into air bag, so that it floats on sea surface;Measuring component includes acceleration sensor, data processor, voice conversion chip, ultrashort wave transmitter, power amplifier circuit, antenna and power supply.Measuring component keeps the state of stable motion under float component, and calculates sea wave height by collecting sea wave acceleration data, and converts it into voice frequency modulation signal and emits to the air above sea surface, for pilot to listen to the voice broadcast of sea wave height.The device is small in size, light in weight, low in measurement cost, and can be used to ensure the safe take-off and landing of aircraft on water surface.

Description

Technical Field

[0001] This invention belongs to the field of wave height measurement technology, and specifically relates to a wave height measuring device and method for real-time measurement of wave height below seaplanes, ensuring the safety of aircraft take-off and landing on water. Background Technology

[0002] my country's new large seaplanes are mainly used for maritime patrol, resupply, and rescue missions. When performing missions at sea, due to the lack of effective means of detecting sea conditions, the aircraft may be unable to take off, land, or land on the sea surface in situations with complex sea conditions and excessively high waves, which seriously affects the flight safety and mission execution. Therefore, seaplanes need to be equipped with equipment to measure the height of sea waves.

[0003] Wave height can be measured using buoys. Wang Yazhou and Li Zhongjun of the Shandong Academy of Sciences' Institute of Marine Instrumentation published an article in the Shandong Science Journal, disclosing the structural design of an SBF3-1 type wave buoy. This buoy incorporates an internal orientation sensor. Since the sensor only functions properly in a non-magnetic environment, the buoy body must be made of non-magnetic materials. The buoy body is a double-layered fiberglass sphere composed of an inner shell and an outer shell, with a diameter of 900mm. Polyurethane foam is filled between the two layers to increase the buoy's resistance to sinking. The entire sphere weighs 125kg. The buoy body, from top to bottom, consists of a top cover, flange, fiberglass sphere, ballast, and mooring plate. Its specific structure is as follows: Figure 1 As shown. The top cover is a steel disc with a diameter of 400mm and a thickness of 10mm; the flange is a copper disc with an outer diameter of 400mm and an inner diameter of 300mm.

[0004] Wave height can be measured using wave height measuring radar mounted on an aircraft. The Institute of Oceanology, Chinese Academy of Sciences, disclosed a "Dual-Polarized X-Band Radar Wave Parameter Measurement System" in patent application number 200910017953.8. The radar consists of a radar host and a dual-polarized antenna connected to the radar host. The radar host is connected to a computer's data acquisition module, which converts the radar's output video signal into a digital signal and stores it in the computer's storage unit. The computer is connected to a polarization switching control module via an I / O interface, and the computer is connected to the dual-polarized antenna via the polarization switching control module. One end of the dual-polarized antenna is connected to the radar host, and the other end is connected to the polarization switching control module, providing wave height information in an all-weather, real-time, efficient, and accurate manner.

[0005] The biggest problems with the existing technologies mentioned above are their large size, heavy weight, and high cost. For example, the market price of wave height measurement radar can reach hundreds of thousands of yuan, and the unit price of wave buoys is also more than 100,000 yuan. Therefore, the market urgently needs a lightweight, low-cost product to replace it. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art by proposing a wireless data transmission ocean wave height measurement device, thereby reducing the size and weight of the measurement device and significantly lowering the measurement cost.

[0007] The technical solution of this invention is implemented as follows:

[0008] 1. A wireless data transmission wave height measurement device, comprising a buoy component 1 and a measuring component 2, the two being fixed together, characterized in that:

[0009] The buoy component 1 includes a liquid sensing circuit 11, an electromagnetic valve 12, a high-pressure carbon dioxide chamber 13, and an airbag 14. The airbag 14 is located above the high-pressure carbon dioxide chamber 13, and the electromagnetic valve 12 is located between the two and is electrically connected to the liquid sensing circuit. The high-pressure carbon dioxide chamber 13 is filled with high-pressure carbon dioxide gas. When the liquid level sensor comes into contact with seawater, the electromagnetic valve 12 is opened, and the carbon dioxide gas rushes into the airbag 14, causing it to expand rapidly and float on the sea surface, moving with the waves.

[0010] The measuring component 2 adopts an integrated structure comprising an accelerometer 21, a data processor 22, a voice conversion chip 23, an ultra-shortwave transmitter 24, a power amplifier circuit 25, an antenna 26, and a power module 27, in order to reduce the size and weight of the device and increase its reliability. The accelerometer 21, data processor 22, voice conversion chip 23, ultra-shortwave transmitter 24, power amplifier circuit 25, and antenna 26 are cascaded in sequence to process the acceleration signal of the waves acquired by the accelerometer and to obtain the wave height by frequency adjustment control through the data processor.

[0011] Furthermore, the liquid sensing circuit 11 is composed of a power amplifier circuit 111 and a liquid level sensor 112. After the liquid level sensor 112 comes into contact with seawater, it generates a standard electrical signal, which is transmitted to the power amplifier circuit 111 for amplification and then triggers the solenoid valve 12 to open.

[0012] Furthermore, the data processor 22 includes:

[0013] The control submodule is used to set the operating mode and frequency of the VHF transmitter, and to write the operating mode and frequency data to the VHF transmitter via the IIC bus. Specifically, the HS6760_Fre() function is used to set the frequency of the VHF transmitter, and the HS6760_SetMode() function is used to set the operating mode of the VHF transmitter. The setting data of these two functions is then written to the VHF transmitter byte by byte through the IIC_WriteOneByte() function, so that one byte of data is written to a fixed address via the IIC bus.

[0014] The calculation submodule is used to receive acceleration data from the accelerometer and calculate the wave height based on the acceleration data. Specifically, it uses the SeaWaveHeight_process() function to perform curve fitting on the wave acceleration data and then calculates the wave height based on the fitted curve.

[0015] Furthermore, the power module 27 is connected to the liquid sensing circuit 11, the accelerometer 21, the voice conversion chip 23, the ultra-shortwave transmitter 24, and the power amplifier circuit 25 respectively to supply power to them.

[0016] Furthermore, the antenna 26 is a helical antenna with a height of no more than 10cm, used to receive the amplified voice FM signal and transmit it.

[0017] Furthermore, the main chip of the VHF transmitter 24 is an HS6760M, with dimensions of 3*3*0.95mm. It supports line-in input and direct MIC input, and its operating modes include normal transmission mode, sleep mode, and quiescent mode, with a frequency of 27-125MHz. The input reference clock supports three crystal oscillators: 7.6MHz / 12MHz / 24MHz. The transmission power is greater than 10dBm. The VHF transmitter receives externally input control signals, generates a carrier signal, modulates the voice signal onto the carrier to obtain a voice FM signal, and then transmits it to the power amplifier circuit.

[0018] 2. A method for wirelessly transmitting wave height measurement using the above-mentioned device, characterized by comprising the following steps:

[0019] 1) Set the transmission frequency and operating mode of the VHF transmitter 24;

[0020] 2) Real-time acceleration data of ocean waves is acquired using accelerometer 21 and sent to data processor 22 via IIC bus. Based on the principle that the vertical acceleration change of a point mass on the water surface approximates a sine curve, the ocean wave acceleration curve a is fitted using FFT operation. S ;

[0021] 3) Based on the fitted curve a SFind the wave height S P-P ;

[0022] 4) The text of the wave height is synthesized into a speech signal using the speech conversion chip 23 and then output;

[0023] 5) The VHF transmitter 24 receives the voice signal, generates a carrier signal according to the control signal transmitted by the IIC bus, modulates the voice signal to obtain a voice frequency modulation signal, and transmits it to the power amplifier circuit 25 for power amplification. The amplified voice frequency modulation signal is transmitted to the airspace above the sea via the antenna 26 for reception by the VHF radio on the aircraft, and the pilot listens to the real-time voice broadcast information of the sea wave height.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. The buoy component of this invention provides buoyancy and maintains stable movement by filling an air bladder with carbon dioxide gas, replacing the existing SBF3-1 wave buoy which uses a fiberglass sphere to obtain buoyancy through a large volume of water displacement. This makes the entire device lightweight, and the air bladder is compressed in the non-working state, resulting in a very small volume. At the same time, the compressed carbon dioxide occupies a small volume, is low in cost, and is lightweight, which greatly reduces the manufacturing cost of the wireless data transmission wave height measurement device, reduces the weight of the device itself, and achieves small size, lightweight and low cost.

[0026] 2. This invention uses a method of transmitting voice signals via ultra-shortwave, and transmits the amplified voice frequency modulation signal through an antenna to the airspace above the sea so that it can be received by the ultra-shortwave radio on the aircraft. This enables the pilot to listen to the sea wave height information in real time, which is convenient for the pilot to perform missions.

[0027] 3. The total cost of the device of this invention is no more than 5,000 yuan. Compared with the existing wave height measuring radar costing hundreds of thousands of yuan and wave buoy costing tens of thousands of yuan, this device saves up to hundreds of thousands of yuan.

[0028] 4. The device of the present invention is mainly used for sea rescue operations, where it is deployed from an aircraft to measure the wave height at the rescue site in real time. At the same time, it does not require retrieval after deployment at sea, thus reducing the workload of aircraft when performing missions at sea. Attached Figure Description

[0029] Figure 1 Here is a structural diagram of the existing SBF3-1 type wave buoy.

[0030] Figure 2 This is a schematic diagram of the device structure of the present invention;

[0031] Figure 3 This is a schematic diagram of the buoy component structure in this invention;

[0032] Figure 4 This is a schematic diagram of the measuring component in this invention;

[0033] Figure 5 This is a flowchart illustrating the implementation of the present invention for measuring ocean wave height. Detailed Implementation

[0034] The embodiments and effects of the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] Reference Figure 2 The wireless data transmission wave height measurement device in this example includes a buoy component 1 and a measuring component 2, which are fixed together. When the entire device is submerged in water, the air bladder of the buoy component inflates, causing the entire device to move on the water surface with the wave movement. The measuring component 2 acquires the acceleration data of the waves as the device moves, and performs storage, calculation, voice conversion, modulation, power amplification, and transmission. The pilot hears the wave height voice broadcast information via the aircraft's VHF radio.

[0036] Reference Figure 3 The buoy component 1 includes a liquid sensing circuit 11, a solenoid valve 12, a high-pressure carbon dioxide chamber 13, and an airbag 14. The liquid sensing circuit 11 includes a liquid level sensor 112 and a power amplifier circuit 111. The airbag 14 is located above the high-pressure carbon dioxide chamber 13, and the solenoid valve 12 is located between the two and electrically connected to the liquid sensing circuit. The high-pressure carbon dioxide chamber 13 is filled with high-pressure carbon dioxide gas. When the liquid level sensor 112 comes into contact with seawater, it generates a standard electrical signal. This electrical signal is transmitted to the power amplifier circuit 111 for amplification. After the amplified electrical signal is transmitted to the solenoid valve 12, the valve opens. The gas pressure in the high-pressure carbon dioxide chamber is greater than the gas pressure in the airbag. The carbon dioxide gas is filled into the airbag 14 through the solenoid valve, causing it to expand rapidly and float on the sea surface, moving with the waves.

[0037] Reference Figure 4The measuring component 2 includes an accelerometer 21, a data processor 22, a voice conversion chip 23, an ultra-shortwave transmitter 24, a power amplifier circuit 25, an antenna 26, and a power module 27. The accelerometer 21, data processor 22, voice conversion chip 23, ultra-shortwave transmitter 24, power amplifier circuit 25, and antenna 26 are cascaded sequentially. The power module 27 is connected to the power amplifier circuit 111, accelerometer 21, voice conversion chip 23, ultra-shortwave transmitter 24, and power amplifier circuit 25 to supply power to them. Accelerometer 21 transmits the collected acceleration data to data processor 22 via IIC bus for storage and calculation. First, the wave acceleration curve is obtained, and then the wave height data is calculated from the wave acceleration curve. The wave height data is transmitted to voice conversion chip 23 via serial port to be converted into a voice signal. The voice signal is transmitted to VHF transmitter 24 for frequency modulation to obtain a voice FM signal. The voice FM signal is transmitted to power amplifier circuit 25 for power amplification, and the amplified voice FM signal is transmitted to antenna 26 to be transmitted to the airspace above the sea surface.

[0038] The acceleration sensor 21 is used to collect wave acceleration data. The wave acceleration data of the water surface where the collection device is located is transmitted to the data processor 22 via the IIC bus.

[0039] The data processor 22 controls the frequency adjustment of the VHF transmitter 24 via the IIC bus, enabling it to generate carrier signals in the corresponding frequency band. The data processor 22 receives acceleration data transmitted from the accelerometer, stores and calculates the acceleration data. By performing an FFT operation on the wave acceleration data, the minimum frequency value excluding zero is taken; this value is approximately the wave acceleration frequency f. Then, the least squares method is used to fit the acceleration curve a. S Then for a S A double integral is performed over time to obtain the wave height data. This wave height data is transmitted to the voice conversion chip 23 via an RS232 bus. The voice conversion chip 23 converts the wave height data into a voice signal and transmits it to the VHF transmitter 24. The VHF transmitter 24 modulates the voice signal using frequency modulation to obtain an FM signal, which is then transmitted to the power amplifier circuit 25 for amplification. The amplified FM signal is then transmitted to the antenna and transmitted. On the aircraft, the wave height voice broadcast information can be received by tuning the VHF radio to the corresponding frequency.

[0040] The data processing module 22 includes a control submodule and a calculation submodule. The control submodule sets the operating mode and frequency of the VHF transmitter and writes this data to the VHF transmitter via the IIC bus. Specifically, it uses the HS6760_Fre() function to set the frequency and the HS6760_SetMode() function to set the operating mode. The settings from these two functions are then written byte-by-byte to the VHF transmitter using the IIC_WriteOneByte() function, allowing one byte of data to be written to a fixed address via the IIC bus. The calculation submodule receives acceleration data from an accelerometer and calculates the wave height based on this data. Specifically, it uses the SeaWaveHeight_process() function to perform curve fitting on the wave acceleration data and then calculates the wave height based on the fitted curve. The UART_Transmit() function of the calculation submodule sends the wave height data to the voice chip via a serial port.

[0041] The voice conversion chip 23 is, but is not limited to, a chip of model XFS3031CNP, with dimensions of 10*10*1.4mm. This chip converts the wave height data transmitted by the data processor 22 into a voice signal, which is then transmitted to the VHF transmitter 24.

[0042] The aforementioned VHF transmitter 24 uses, but is not limited to, a chip with the main chip HS6760M, which has dimensions of 3*3*0.95mm. It supports line-in input and direct MIC input. The chip's operating modes include normal transmission mode, sleep mode, and quiescent mode, with a frequency of 27-125MHz. The input reference clock supports three crystal oscillators: 7.6MHz / 12MHz / 24MHz. The transmission power is greater than 10dBm. The VHF transmitter receives externally input control signals, generates a carrier signal, modulates the voice signal onto the carrier to obtain a voice FM signal, and then transmits it to the power amplifier circuit.

[0043] The power amplifier circuit 25 uses, but is not limited to, a TDA1521 chip, which is an audio power amplifier chip with low distortion and high stability. Its operating voltage is ±16V, impedance is 8 ohms, output power is 30 watts, and distortion rate is no more than 0.5%. It is used to amplify the voice FM signal transmitted by the VHF transmitter 24.

[0044] The antenna 26 is, but is not limited to, a helical antenna with a height of no more than 10 cm and an antenna gain of no less than 3.5 dBi; it is used to receive amplified voice FM signals and transmit them.

[0045] The power module 27 has an operating time of 2 hours to 12 hours.

[0046] Reference Figure 5 The method for wirelessly transmitting data to measure wave height using the aforementioned device is based on the fact that the vertical acceleration change of a point mass on the water surface approximates a sine curve. The wave acceleration data is processed by FFT to obtain the wave acceleration frequency f, and then the wave acceleration curve is fitted using the least squares method. The implementation steps are as follows:

[0047] Step 1: Set the operating mode and transmission frequency of the VHF transmitter.

[0048] The control submodule uses the HS6760_Fre() function to set the frequency of the VHF transmitter and the HS6760_SetMode() function to set the operating mode of the VHF transmitter.

[0049] Step 2: Simplify the formula for the wave acceleration curve.

[0050] Accelerometer 21 acquires real-time acceleration data of ocean waves, which is then transmitted to data processor 22 via the IIC bus. Based on the principle that the vertical acceleration change of a point mass on the water surface approximates a sine curve, the ocean wave acceleration curve is approximated as a sine curve, and its formula is as follows:

[0051]

[0052] In the formula, A is the average amplitude of the wave acceleration, and f is the frequency of the wave acceleration. A1 represents the initial phase of the wave acceleration, and A2 represents the DC component of the wave acceleration.

[0053] Accelerometer 21 is used to acquire real-time wave acceleration data. This acceleration data is then sent to data processor 22 via the IIC bus. The wave acceleration data is acquired in real time, and its average value is calculated. The average value is then subtracted from the wave acceleration data at each moment to make the DC component A1 of the wave acceleration curve zero, resulting in the simplified formula for the wave acceleration curve:

[0054] a = Acos(2πft + φ).

[0055] Step 3, calculate the maximum value 'a' of the wave acceleration data. max Determine the parameter f in the curve formula.

[0056] The data processor uses the MAX function to compare all received wave acceleration data and extract the maximum value 'a'. max ;

[0057] Perform FFT on all wave acceleration data, and take the smallest frequency except for 0 frequency to obtain the approximate acceleration main frequency f.

[0058] Step 4, determine the parameter A in the curve formula.

[0059] The curve fitted using the least squares method is characterized by the fact that the actual data points are all located not far above or below this curve. This curve can reflect the overall distribution of the data without showing large local fluctuations, so that the deviation between the obtained function and the known function is minimized overall, and it can be approximated as the known function.

[0060] This step, based on the characteristics of the curve fitted by the least squares method, centers on f and within the range [f-Δf, f+Δf]. Within the range, the least squares method is used to fit the acceleration curve, and the parameters A and B in the formula are obtained. The specific implementation is as follows:

[0061] 4.1) Calculate the mean square error of the wave acceleration data:

[0062] 4.1.1) In Within the range, increments of 0.2 are used. Start giving Values, in For each value, the increment is 0.01 times the gravitational acceleration, starting at 0.01g in [0, a]. max Within the range of A k Assignment, time t i Wave acceleration data is received every 25µs. ijk 2048 wave acceleration data points were continuously received, where 1 ≤ i ≤ 2048, 1 ≤ j ≤ 31. g is the acceleration due to gravity;

[0063] 4.1.2) with Starting at A1 = 0.01g, a wave acceleration a is received every 25µs. i11 The first set of theoretical values ​​for wave acceleration a' were calculated based on the formula for wave acceleration curves. i11 =0.01gcos(2πft) i );

[0064] 4.1.3) with Starting with A2 = 0.02g, measure the wave acceleration a every 25µs. i12 The second set of theoretical values ​​for wave acceleration a' were calculated based on the formula for wave acceleration curves. i12 =0.02gcos(2πft) i Repeat this calculation until A. k =a max

[0065] 4.1.4) with Starting at A1 = 0.01g, a wave acceleration a is received every 25µs. i21 A set of theoretical values ​​for wave acceleration a' were calculated based on the formula for wave acceleration curves. i21 =0.01gcos(2πft) i +0.2);

[0066] 4.1.5) with Starting at A2 = 0.02g, a wave acceleration a is received every 25µs. i22 A set of theoretical values ​​for wave acceleration a' were calculated based on the formula for wave acceleration curves. i22 =0.02gcos(2πft) i +0.2), repeat this calculation until A. k =a max ;

[0067] 4.1.6) Starting from 0 and increasing by 0.2 increments, the value increases sequentially up to 2π. At each given... Next, give A k Assign values, starting from 0.01g and increasing in increments of 0.01g until a. max In various Value and A k Under the combination of values, time t i 2048 wave acceleration data points were received at 25µs intervals, and different values ​​were applied to them according to the wave acceleration curve formula. Values ​​and theoretical values ​​a' under different A values ijk Calculations were performed, and a total of [number] results were calculated. Theoretical value a' ijk ,in

[0068] 4.1.7) Calculate the time period using the mean square error formula. M mean square error values ​​within seconds Where π≈3.14, g≈9.8m / s 2 ;

[0069] 4.2) From all the calculated mean square error values, select the wave acceleration amplitude A corresponding to the smallest mean square error value. S and initial phase The values ​​are respectively used as parameters A and B in the formula for the wave acceleration curve. The value of .

[0070] Step 5: Fit the acceleration curve.

[0071] Based on the frequency f obtained by FFT and the wave acceleration amplitude A obtained by least squares method Sand initial phase The value was fitted to a time period of 16.4 years. max Wave acceleration curve within seconds:

[0072] Step 6: Calculate the wave height S based on the fitted curve. P-P .

[0073] 6.1) Regarding the wave acceleration curve a S By performing a double integral over time t, we obtain the wave displacement curve S:

[0074]

[0075] Where f is the frequency obtained by performing an FFT on the wave acceleration data, and A S and These are the wave acceleration amplitude and initial phase values ​​obtained by the least squares method, respectively;

[0076] 6.2) Order And 1, respectively, yield the maximum value of the wave displacement curve. and minimum value

[0077] 6.3) According to S max and S min The wave height S is obtained. P-P :

[0078] Step 7: Process the wave height data into a voice FM signal and transmit it over the sea.

[0079] The calculation submodule organizes the obtained wave height data into voice broadcast data and transmits it to the voice conversion chip HS6760M;

[0080] The voice chip converts the received voice broadcast data into voice signals and transmits them to the VHF transmitter;

[0081] The control submodule controls the VHF transmitter to generate a carrier frequency via the IIC bus. The VHF transmitter modulates the voice signal to obtain a voice FM signal and transmits it to the power amplifier circuit.

[0082] The power amplifier circuit amplifies the voice FM signal to obtain the amplified voice FM signal;

[0083] The amplified audio signal was transmitted over the sea via a helical antenna;

[0084] Pilots can receive voice broadcasts of wave height by tuning the aircraft's VHF radio to the appropriate frequency while over the sea.

[0085] The above description is merely a specific example of the present invention and does not constitute any limitation on the present invention. Obviously, those skilled in the art, after understanding the content and principles of the present invention, may make various modifications and changes in form and details without departing from the principles and structure of the present invention. However, these modifications and changes based on the concept of the present invention are still within the scope of protection of the claims of the present invention.

Claims

1. A wireless data transmission method for measuring ocean wave height, characterized in that, Includes the following steps: (1) Set the transmission frequency and operating mode of the ultra-shortwave transmitter (24); (2) Use an accelerometer (21) to acquire real-time acceleration data of the waves, and send the acceleration data to the data processor (22) via the IIC bus. Based on the principle that the change in vertical acceleration of a point on the water surface is approximately a sine curve, the wave acceleration curve is fitted by FFT operation. The implementation is as follows: (2a) Calculate the average value of the real-time acquired wave acceleration data, and subtract the average value from the wave acceleration data at each time point to obtain the formula for the wave acceleration curve: Where A is the average amplitude of the wave acceleration, and f is the frequency of the wave acceleration. This represents the initial phase of the wave acceleration. (2b) Find the maximum value of the real-time acquired wave acceleration data. ; (2c) Determine the parameters in the curve formula: A, f, ; (2c1) at φj Within the range, increments of 0.2 with φj Start by assigning values ​​to φj, and for each value, increment by 0.01 times the gravitational acceleration, starting with 0.01g. Assign a value to Ak within the range, and receive wave acceleration data every 25µs at time intervals ti. It continuously received 2048 wave acceleration data points. , , g is the acceleration due to gravity; (2c2) Perform FFT on 2048 continuously received wave acceleration data points to obtain the wave acceleration frequency f, which is given by (2c1) for different values ​​of A and f. The theoretical values ​​of wave acceleration for each group were calculated. The time period is calculated as 25µs * 2048 based on the mean square error formula. * within seconds * =M mean square errors ; (2c3) Take the wave acceleration amplitude corresponding to the smallest mean square error value from all the calculated mean square error values. and initial phase The values ​​are respectively used as parameters A and B in the formula for the wave acceleration curve. The value; (2d) The wave acceleration amplitude is obtained from the frequency f obtained by FFT and the minimum mean square error method. and initial phase Values, fitted over a period of time Wave acceleration curve within seconds: ; (3) Based on the fitted curve Find the wave height The implementation is as follows: (3a) Wave acceleration curve By performing a double integral over time t, we obtain the wave displacement curve S: ， Where f is the frequency obtained by FFT operation. and These are the wave acceleration amplitude and initial phase values ​​obtained by the minimum mean square error method, respectively. (3b) Let And 1, respectively, yield the maximum value of the wave displacement curve. and minimum value ; (3c) by minus Determine the wave height: ; (4) Use the voice conversion chip (23) to synthesize the wave height text into a voice signal and output it; (5) The VHF transmitter (24) receives the voice signal, generates a carrier signal according to the control signal transmitted by the IIC bus, modulates the voice signal to obtain the voice frequency modulation signal, transmits it to the power amplifier circuit (25) for power amplification, and transmits the amplified voice frequency modulation signal to the airspace above the sea via the antenna (26) for reception by the VHF radio on the aircraft. The pilot hears the real-time voice broadcast information of the sea wave height.

2. A wave height measuring device for implementing the method of claim 1, comprising a buoy component (1) and a measuring component (2), the two being fixed together, characterized in that: The buoy component (1) includes a liquid sensing circuit (11), an electromagnetic valve (12), a high-pressure carbon dioxide chamber (13), and an airbag (14). The airbag (14) is located above the high-pressure carbon dioxide chamber (13), and the electromagnetic valve (12) is located between the two and is electrically connected to the liquid sensing circuit. The high-pressure carbon dioxide chamber (13) is filled with high-pressure carbon dioxide gas. When the liquid level sensor comes into contact with seawater, the electromagnetic valve (12) is opened, and the carbon dioxide gas rushes into the airbag (14), causing it to expand rapidly and float on the sea surface, moving with the waves. The measuring component (2) adopts an integrated structure that includes an accelerometer (21), a data processor (22), a voice conversion chip (23), an ultra-shortwave transmitter (24), a power amplifier circuit (25), an antenna (26), and a power module (27) to reduce the size and weight of the device and increase its reliability. The accelerometer (21), data processor (22), voice conversion chip (23), ultra-shortwave transmitter (24), power amplifier circuit (25), and antenna (26) are cascaded in sequence to process the acceleration signal of the waves acquired by the accelerometer and to obtain the wave height by frequency adjustment control through the data processor.

3. The apparatus according to claim 2, characterized in that: The liquid sensing circuit (11) consists of a power amplifier circuit (111) and a liquid level sensor (112). When the liquid level sensor (112) comes into contact with seawater, it generates a standard electrical signal that is transmitted to the power amplifier circuit (111) for amplification and then triggers the electromagnetic valve (12) to open.

4. The apparatus according to claim 2, characterized in that: The data processor (22) includes: The control submodule is used to set the operating mode and frequency of the VHF transmitter, and write the operating mode and frequency data to the VHF transmitter via the IIC bus. Specifically, the HS6760_Fre() function is used to set the frequency of the VHF transmitter, and the HS6760_SetMode() function is used to set the operating mode of the VHF transmitter. The setting data of these two functions is then written to the VHF transmitter byte by byte through the IIC_WriteOneByte() function, so that one byte of data is written to a fixed address via the IIC bus. The calculation submodule is used to receive acceleration data from the accelerometer and calculate the wave height based on the acceleration data. Specifically, it uses the SeaWaveHeight_process() function to perform curve fitting on the wave acceleration data and then calculates the wave height based on the fitted curve.

5. The apparatus according to claim 2, characterized in that: The power module (27) is connected to the liquid sensing circuit (11), the accelerometer (21), the voice conversion chip (23), the ultra-shortwave transmitter (24), and the power amplifier circuit (25) respectively to supply power to them.

6. The apparatus according to claim 2, characterized in that: The antenna (26) is a spiral antenna with a height of no more than 10cm, used to receive the amplified voice frequency modulation signal and transmit it.

7. The apparatus according to claim 2, characterized in that: The main chip of the ultra-shortwave transmitter (24) is HS6760M, with a size of 3*3*0.95mm. It supports line-in input and direct MIC input. Its working modes include normal transmission mode, sleep mode, and quiescent mode. The frequency is 27~125MHz. The input reference clock supports three crystal oscillators: 7.6MHz, 12MHz, and 24MHz. The transmit power is greater than 10dBm. The VHF transmitter receives externally input control signals, generates a carrier signal, modulates the voice signal onto the carrier signal to obtain a voice FM signal, and then transmits it to the power amplifier circuit.

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