Low-altitude meteorological detection method

Abstract

The invention discloses a low-altitude meteorological detection method, and the method comprises the following steps: S1, bringing a lift-off detection device into the air through a small sounding balloon; s2, environment information is collected through a lift-off detection device and transmitted to a ground receiver through a wireless transmission module; the environment information comprises temperature and humidity, air pressure, positioning, wind speed, wind direction and attitude information; and S3, the ground receiver receives the data acquired by the lift-off detection equipment, and real-time man-machine interaction is realized. The method can more accurately restore environment information of battlefield equipment acquisition points, including subtle changes of temperature and humidity, fluctuation of air pressure, and key parameters such as acceleration, direction, attitude and the like when the equipment moves, and even can accurately capture changes of a geomagnetic field. Powerful data support is provided for battlefield situation analysis, target positioning, environment monitoring and the like, and the accuracy and decision-making efficiency of combat command are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of meteorological detection, and in particular to a low-altitude meteorological detection method. Background Art

[0002] Low-altitude meteorological detection is aimed at airborne training. It uses low-altitude unmanned free balloons as carriers to detect the low-altitude (within 3,000 meters) meteorological environment of the airborne area, ensure the safety of personnel in training and exercise missions, and improve the accuracy of airborne landings.

[0003] However, the existing low-altitude meteorological detection methods have poor precision and accuracy, which seriously affects the accuracy of combat command and decision-making efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a low-altitude meteorological detection method to solve the technical problem of how to provide low-altitude meteorological detection precision and accuracy.

[0005] The present invention is implemented by adopting the following technical scheme: a low-altitude meteorological detection method, comprising the following steps: S1: Bring the detection equipment into the air via a small sounding balloon; S2: Collect environmental information through the aerial detection equipment and transmit it to the ground receiver through the wireless transmission module; the environmental information includes temperature and humidity, air pressure, positioning, wind speed, wind direction and attitude information; S3: The ground receiver receives the data collected by the space detection equipment to achieve real-time human-computer interaction.

[0006] Furthermore, the lift-off detection device is integrated with a pressure sensor, which collects the ambient air pressure and converts the data to obtain the air pressure data of the current altitude, and obtains the altitude corresponding to the air pressure through the air pressure relationship in different altitudes.

[0007] Furthermore, the altitude or air pressure data is calculated by the pressure-height conversion method: H s = H0+R / g×T m ×ln(P0 / P s ); Where: H s is the altitude of the standard isobaric surface; H0 is the altitude of the measuring station; R is the gas constant; g is the gravitational acceleration; T m is the average temperature of the air column; P0 is the ground pressure at the measuring station; P s is the air pressure at the mean height of the air column.

[0008] Furthermore, the altitude is calculated using the standard atmospheric pressure method: ; Among them, P0 is the standard atmospheric pressure; P is the actually measured atmospheric pressure; T is the actually measured temperature.

[0009] Furthermore, the lift-off detection device is integrated with a Beidou positioning module, and the wind speed and wind direction are calculated by the latitude and longitude position coordinates output by the Beidou positioning module: Wind speed = position difference between two times / time interval + parameter correction; Wind direction = X and Y axis projection of (position vector difference between the two times + parameter correction).

[0010] Furthermore, the lift-off detection device is integrated with an airflow field vector sensor and an attitude sensor. The airflow field in the airspace is detected by the airflow field vector sensor, and the wind speed and wind direction are obtained after the incoming flow direction detected by the attitude sensor is corrected.

[0011] Furthermore, the wind speed and wind direction calculated by the Beidou positioning module are integrated with the wind speed and wind direction calculated by the airflow field vector sensor to obtain accurate and high-precision airspace wind speed and wind direction parameters.

[0012] Furthermore, the lift-off detection device integrates an acceleration sensor and a gyroscope or geomagnetism, and uses the Euler angle method to convert the data of the accelerometer and gyroscope or geomagnetism into the attitude angle of the device, and the attitude angle includes a pitch angle, a roll angle and a yaw angle.

[0013] The beneficial effects of the present invention are: The present invention can more accurately restore the environmental information of battlefield equipment collection points, including subtle changes in temperature and humidity, fluctuations in air pressure, and key parameters such as acceleration, direction, and posture when the equipment moves. It can even accurately capture changes in the geomagnetic field, providing strong data support for battlefield situation analysis, target positioning, environmental monitoring, etc., greatly improving the accuracy of combat command and decision-making efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0015] Figure 1 It is a flow chart of the present invention; Figure 2 It is the principle diagram of the present invention; Figure 3 Schematic diagram for detecting wind speed and direction for vector airflow field. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0017] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0018] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0019] See also Figure 1 , a low-altitude meteorological detection method, comprising the following steps: S1: Bring the detection equipment into the air via a small sounding balloon; S2: Collect environmental information through the aerial detection equipment and transmit it to the ground receiver through the wireless transmission module; the environmental information includes temperature and humidity, air pressure, positioning, wind speed, wind direction and attitude information; S3: The ground receiver receives the data collected by the space detection equipment to achieve real-time human-computer interaction.

[0020] For further information, see Figure 2 The present invention provides an implementation method, which specifically includes a lift-off detection subsystem and a ground receiving subsystem. The lift-off detection subsystem and the ground receiving subsystem transmit data through wireless communication. The lift-off detection subsystem integrates multiple sensors to obtain temperature, air pressure, positioning and attitude information, and transmits the information to the ground receiving subsystem. The ground receiving subsystem receives the data transmitted by the lift-off detection subsystem and provides a visual human-computer interaction platform to realize real-time human-computer interaction.

[0021] In this embodiment, the lift-off detection subsystem is composed of an unmanned free balloon and lift-off detection equipment, which are connected by flanges and other structures. The lift-off detection subsystem is provided with a main control chip, which uses HC32L70JATA-LQ48 as the main control chip, 48-pin package, uses the Cortex-M0+ core, and the main frequency can reach up to 48MHz. The lift-off detection subsystem is provided with a temperature and humidity acquisition sensor, which uses the SHT45 temperature and humidity sensor, with a relative humidity accuracy of ±1% and a temperature accuracy of ±0.1°C. It uses I2C to communicate with the main control chip, and can directly read the temperature and humidity data built into the sensor.

[0022] The data is converted as follows:

[0023] In this embodiment, the lift detection subsystem is provided with an air pressure acquisition device, which uses a BMP388 air pressure sensor with a measurement range of 300~1250hPa and an air pressure accuracy of up to ±0.5hPa. The height of the device is calculated through the air pressure data, and I2C is used to communicate with the main control chip; at the same time, 4 SDP31 micro-pressure differential sensors are used to accurately measure the gas pressure difference and calculate the wind speed and direction. The two-way pressure difference of -500~500Pa can be measured, and the zero point accuracy is 0.1Pa, and there is no zero point drift. The air pressure sensor is used to collect the air pressure of the environment where the device is located. The device processor uses the I2C communication protocol to convert the air pressure data collected by the air pressure sensor to obtain the air pressure data of the current altitude. Then, the altitude corresponding to the corresponding air pressure is calculated based on the air pressure relationship in different altitudes. The flight altitude is obtained by comparing the air pressure collected at startup with the air pressure collected during flight.

[0024] Method 1: The formula for converting air pressure to altitude is as follows: H s = H0+R / g×T m ×ln(P0 / P s ); in: H s is the altitude of the standard isobaric surface (the height to be determined).

[0025] H0 is the altitude of the station (known).

[0026] R is the gas constant (constant), and its value is 8.3145 J / (mol·K).

[0027] g is the acceleration due to gravity (a constant that changes only slightly with altitude and can be considered a constant), 9.80 m / s².

[0028] T mis the average temperature of the air column (needs to be estimated or measured based on actual conditions).

[0029] P0 is the ground pressure at the measuring station (known).

[0030] P s is the air pressure at the average height of the air column (to be determined or known and used to infer the height).

[0031] Method 2: Standard atmospheric pressure calculation method: ; Where P0 is the standard atmospheric pressure, which is 101.325 kPa; P is the actual measured atmospheric pressure, in kPa; T is the actual measured temperature, in °C. In the above formula, (T + 273.15) is the conversion of degrees Celsius to Calvin. This formula considers both temperature and pressure to calculate altitude.

[0032] In addition, the aerial detection subsystem can also collect wind speed and direction: it mainly uses a fusion of two detection technologies to ensure the accuracy and reliability of detection.

[0033] Technical method 1: Position calculation: Calculate the wind speed and direction through the longitude and latitude coordinates output by the Beidou positioning module.

[0034] Wind speed (scalar) = (position difference between two times) / time interval + parameter correction Wind direction (vector) = (the difference between the two position vectors + parameter correction) X and Y axis projection Technical method 2: vector airflow field detection. The airflow field in the airspace is detected by the airflow field vector sensor built into the detection subsystem, and the accurate wind speed and direction are obtained after the incoming flow direction detected by the attitude sensor is corrected.

[0035] When the airflow Figure 3 When the air flows through the sensor in the direction shown, positive pressure will be formed between P3-1 and P3-2, and there will be corresponding vector reactions on P2 and P4. On P1, it will show a relatively stable pressure difference. Through the accurate airflow field vector model, the precise wind speed and direction can be calculated. By fusing the data obtained by the two technical tests, accurate and high-precision airspace wind speed and direction parameters can be obtained.

[0036] In this embodiment, the lift-off detection subsystem is provided with a positioning module, which uses the ATGM336H-5N31 GPS+Beidou fusion module, with a positioning accuracy of 2.5 meters, and communicates with the main control chip using UART. In addition, the lift-off detection subsystem is provided with a power module, which uses a 1000mAh polymer lithium battery with an output voltage of 3.7V, with overvoltage, overcurrent, overdischarge, and short-circuit protection, and uses a TP4056 charging chip and a Type-c interface to realize the charging function.

[0037] In this embodiment, a communication module is provided on the lift-off detection subsystem. The communication module adopts the Ra-02 module, with the RF chip SX1278 as the core. The measured communication distance can reach 8KM. At the same time, a 470MHz 70*20mm FPC antenna is used to enhance the signal, and the peak gain can reach 8dBi.

[0038] In this embodiment, the lift-off detection subsystem is provided with an attitude data acquisition module, which uses the LSM6DSLTR chip, a three-axis acceleration and three-axis gyroscope fusion chip, with an acceleration resolution of up to 0.061mg / LSB, and an angular velocity of up to 4.375mdps / LSB. Different measurement ranges can be selected for different scenarios. The roll angle and pitch angle in the attitude angle can be obtained by fusion of the six-axis data of acceleration and angular velocity X, Y, and Z. The MMC5983MA three-axis magnetometer is used as the geomagnetic data acquisition chip, with a maximum resolution of 0.0625mG / LSB. By collecting geomagnetic data in the three-axis dimensions of X, Y, and Z, the yaw angle in the attitude angle can be obtained. And I2C is used to communicate with the main control chip.

[0039] The attitude data acquisition module is combined with a 6-axis acceleration sensor and a 3-axis geomagnetic sensor. Using IIC communication, it can read the acceleration and angular velocity data on the sensor's X, Y, and Z axes, as well as the geomagnetic data on the sensor's X, Y, and Z axes.

[0040] The processing of posture data is: The process of converting the data of the accelerometer and gyroscope or geomagnetism into the attitude angle (pitch angle Pitch, roll angle Roll, yaw angle Yaw) of the device is called attitude solution. Among the many attitude solution methods, the Euler angle method is the most intuitive and easier to understand, but it faces stability problems such as universal lock; the direction cosine matrix law provides a comprehensive description of rotation, but the calculation complexity is high. In contrast, the quaternion method has the advantages of excellent numerical stability and efficient computing performance, and has become the preferred solution for this design. As the core sensor, the gyroscope continuously provides angular velocity data, which reflects the dynamic rotation of the device in real time through the quaternion update algorithm. However, after the gyroscope runs for a long time, drift errors will occur, affecting the accuracy of attitude solution. Therefore, the present invention introduces accelerometer data as a correction factor. The accelerometer can accurately measure the acceleration of the device in the gravity field, thereby indirectly inferring the tilt angle of the device. By fusing the data of the accelerometer, the quaternion is finely adjusted to compensate for the drift of the gyroscope and improve the accuracy and reliability of attitude solution. After obtaining the corrected quaternion, it can be converted into Euler angles to obtain three attitude angles.

[0041] Use the attitude angles to get the direction cosine rotation matrix: ; The corresponding quaternion rotation matrix: ; The combination of the two can further solve the attitude angle: .

[0042] In this embodiment, a self-destruct module is provided on the lift-off detection subsystem. When the acquisition altitude is higher than 5000 meters or a free fall is detected, the program will execute the flash full chip erase instruction. When the flash data is erased, the main control chip will be automatically burned.

[0043] In this embodiment, a protective structure is provided on the lift-off detection subsystem, and the protective structure is protected by a buffer material to prevent the lift-off detection subsystem from falling and causing harm to the training personnel on the ground when it self-destructs at high altitude. After the lift-off detection subsystem is completed, it can be stored until it is used, triggers the self-destruction task, or the built-in battery expires and automatically triggers self-destruction. It should be noted that please make sure it is fully charged before use. The aerial device is turned on or off through the self-locking button. After turning on, the device sends data to the ground, including the positioning information of the aerial end, to ensure that the device is released only after waiting in an open area for the device to complete positioning. After the device is released, it cannot be recovered until the task is completed, the balloon explodes, and the device falls and is automatically destroyed.

[0044] Performance indicator module of the lift detection subsystem: temperature and humidity measurement range: -40℃~70℃, resolution: 0.1℃, measurement error: ±0.2℃; air pressure measurement range: 550-1100hPa, resolution: 0.1hPa, measurement error: ±0.5hPa; positioning accuracy: ±5 meters; sounding altitude: 3000 meters; average ascent speed: 200m / min; effective sounding time: 15 minutes; wireless communication distance: 8000 meters in a straight line; wind speed measurement range: 0~35m / s, resolution: 0.5m / s, error: ±1m / s (wind speed range 0-10m / s), ±10% (Wind speed measurement range>10m / s); wind direction measurement range: 0~360°, resolution: 1°, wind direction measurement error: ±10°; at a sounding altitude of 3000 meters and an average ascent speed of 200m / min, the effective sounding time is 15 minutes, working at a wind speed of level 4, at a horizontal drift speed of 8.22m / s, the horizontal drift within the effective sounding time is approximately 7.39km, and the straight-line communication distance is 8km.

[0045] In this embodiment, the ground receiving subsystem is provided with a main control chip, using HC32F460PCTB-LQFP100 as the main control chip, 100-pin package, using Cortex-M4 core, the main frequency can reach up to 200M, with resources Flash256KB, RAM192KB, 3-way I2C, 4-way SPI, and a USB2.0. The peripheral resources meet the requirements of this design, and the power consumption can reach as low as 1.8uA in power-off mode. The ground receiving subsystem is provided with a positioning module, using ATGM336H-5N31 GPS+Beidou fusion module, the positioning accuracy reaches 2.5 meters, and communicates with the main control chip using UART. The ground receiving subsystem is provided with a power module, using 5 18650 lithium battery packs, parallel mode, output voltage 3.7V, total capacity 10Ah, can be repeatedly charged and discharged. At the same time, it adopts the ip5109 power management chip, output overcurrent, overvoltage, short circuit protection, input overvoltage, overcharge, overdischarge, overcurrent discharge protection, charging voltage accuracy of ±0.5%, supports battery power reading, and uses I2C to communicate with the main control chip. The ground receiving subsystem is equipped with an interface module, using the type-c communication interface and the USB2.0 communication protocol. One interface is used to realize device charging and device data communication, and the communication rate can reach 200Mbps. It supports the use of customized protocols for data communication and data export, and supports virtual serial port communication and other methods. The ground receiving subsystem is equipped with a software system communication module, using the Quectel EC800K chip as the 4G communication module, using the 4G CAT1 standard for communication, supporting a maximum downlink rate of 10Mbps and a maximum uplink rate of 5Mbps. The device supports full network access. The 4G communication module supports a variety of mainstream communication protocols including MQTT, TCP, and UDP. This wide range of protocol compatibility enables the device to flexibly adapt to different network environments and communication requirements. Users can choose the most appropriate protocol for data exchange according to the characteristics and requirements of the actual application scenario, thereby optimizing the efficiency and security of data transmission. In addition to supporting these general protocols, the device also seamlessly integrates the data transmission protocol developed in-house by the company, which has been carefully designed and rigorously tested, focusing on improving the security and customization needs of data transmission. With the internal protocol, users can enjoy higher levels of security features such as data encryption, authentication, and access control to ensure that data is protected from unauthorized access and malicious tampering during transmission. At the same time, the device also supports customized development of data transmission protocols based on the specific needs of third-party partners or customers. This three-party customized data transmission protocol can closely fit the customer's business logic and data flow, and realize accurate and efficient data transmission. By deeply understanding the customer's business scenarios and data security requirements, we can customize data transmission solutions that are both in line with industry standards and highly secure, providing strong support for customers' digital transformation.

[0046] In this embodiment, the ground receiving subsystem is provided with a LORA module, using E22-400M30S, and the RF chip uses SX1268 as the core. The measured communication distance can reach 12KM, and SPI is used to communicate with the main control chip. At the same time, the BW433XWX120-8L1000J antenna is used to enhance the signal, and the peak gain can reach 8dBi. The LORA module uses the LORA communication protocol to realize the advanced encryption function in the data transmission process, ensuring that every piece of data collected by the sensor can be safely transmitted in ciphertext form, effectively resisting the risk of data theft and tampering, thereby ensuring the integrity and confidentiality of the data. In addition, the protocol also has a built-in intelligent drop point return mechanism, which can automatically detect and try to re-establish the connection even if the communication link is temporarily interrupted, ensuring that key data will not be lost due to network fluctuations, greatly improving the reliability and stability of data transmission. High communication efficiency is another highlight of the protocol. The use of customized communication protocols significantly improves the data transmission rate, reduces communication delays, makes remote monitoring and real-time data transmission possible, and meets the strict requirements for time-sensitive applications.

[0047] In this embodiment, the ground receiving subsystem is provided with a human-machine interaction module, using a 2.4-inch TFT ILI9341 screen to display the device's network information, power information, positioning information, and sensor data information of specific launch detection equipment. The ground receiving subsystem is provided with a storage module, using a W25Q128JVSIQ Flash chip, which can store more than 100,000 sensor data.

[0048] The performance indicators of the ground receiving subsystem include: antenna gain: 8dbi; LORA wireless communication distance: 10KM; 4G operator support: full network access; 4G communication mode: CAT1; screen size: 2.4 inches; data storage space: 16MB; power supply method: battery power supply, USB (type-c) power supply; communication rate: 200Mbps; battery capacity: 10Ah; battery power supply time: 168 hours; device power consumption: 15W.

[0049] Based on the above embodiments, the present invention has at least the following technical effects: The present invention adopts the innovative new generation LORA (Long Range) communication technology, which greatly enhances the data transmission capability. It can not only ensure that the aerial detection system can achieve a stable and reliable straight-line communication distance of 5 kilometers and meet the instant communication needs of high-altitude detection, but also achieve a wireless communication distance of up to 10 kilometers between the ground station and the remote device, providing a wider and more flexible coverage for remote monitoring, data collection and command and dispatch.

[0050] The present invention fully integrates a variety of ultra-high precision sensors, including but not limited to temperature and humidity sensors, micro-pressure differential sensors, barometers, accelerometers, gyroscopes, and geomagnetic sensors, etc. These sensors work together to capture extremely subtle environmental changes. Advanced high-level filtering algorithms are used inside the system to effectively filter out interference signals and ensure that the collected data is accurate. At the same time, advanced filtering algorithms and advanced wireless communication technologies are used internally. Not only does it achieve high-speed data transmission, but it also ensures security and privacy during data transmission through data encryption technology. This design enables the system to more accurately restore the environmental information of battlefield equipment collection points, including subtle changes in temperature and humidity, fluctuations in air pressure, and key parameters such as acceleration, direction, and posture when the equipment moves. It can even accurately capture changes in the geomagnetic field, providing strong data support for battlefield situation analysis, target positioning, environmental monitoring, etc., greatly improving the accuracy of combat command and decision-making efficiency.

[0051] The design of this invention fully considers portability and flexibility, and the overall weight is precisely controlled within a light range of no more than 130 grams, making it particularly easy to carry by a single soldier or integrate into other equipment. The volume of the launch detection system is exquisitely compressed to no more than 5 cubic centimeters. This design not only reduces air resistance and improves launch efficiency, but also greatly facilitates rapid deployment and recovery in different scenarios, truly realizing "lightweight and flexible response".

[0052] The ground receiving system adopts advanced ergonomic design concepts, and its appearance contour is highly consistent with the natural gripping posture of the hand, which can maintain comfort and effortlessness even for long-term operation. In addition, the system is also equipped with a variety of flexible installation methods, whether it is directly held or fixed by ground stakes, it can be completed quickly and is stable and reliable. This design not only improves operational efficiency, but also ensures adaptability under different terrains and environmental conditions, providing strong support for battlefield reconnaissance, environmental monitoring, emergency response and other tasks. In addition, the ground receiving system adopts a three-proof design and supports IP67 waterproof rating. This means that it can work continuously for 30 minutes at a depth of 1 meter underwater without damage, effectively resisting the invasion of harsh natural environments such as rain, mud, sand and dust, and ensuring that the equipment can maintain stable operation under various complex and changeable weather conditions, regardless of wind and rain, and move forward courageously. Ensure the stable operation of the equipment and face harsh environmental weather. LORA communication adopts a new generation of communication technology and uses customized communication protocols to effectively ensure data security and reliability.

[0053] In terms of communication, the present invention is equipped with a new generation of LORA communication technology, which has become a leader in the current wireless communication field with its significant advantages such as long distance, low power consumption, and strong anti-interference. It is worth mentioning that in order to further improve the security and reliability of data transmission, the device also adopts a customized communication protocol. This protocol has been carefully designed and optimized to ensure encryption and complete verification of data during transmission, effectively prevent data leakage and tampering, and provide users with an indestructible data security barrier.

[0054] For the aforementioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the order of the actions described, because according to the present application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are preferred embodiments, and the actions involved are not necessarily required by the present application.

[0055] The above embodiments describe the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the changes and modifications made by those skilled in the art shall be within the scope of protection of the appended claims of the present invention without departing from the spirit and scope of the present invention.

Claims

1. A low-altitude meteorological detection method, characterized in that: The steps include: S1: Bring the detection equipment into the air via a small sounding balloon; S2: Collect environmental information through the aerial detection equipment and transmit it to the ground receiver through the wireless transmission module; the environmental information includes temperature and humidity, air pressure, positioning, wind speed, wind direction and attitude information; S3: The ground receiver receives the data collected by the space detection equipment to achieve real-time human-computer interaction.

2. A low-altitude meteorological detection method as claimed in claim 1, characterized in that: The lift detection device is integrated with a pressure sensor, which collects ambient air pressure and performs data conversion to obtain air pressure data at the current altitude, and obtains the altitude corresponding to the air pressure through the air pressure relationship in different altitudes.

3. A low-altitude meteorological detection method as claimed in claim 2, characterized in that: Calculate altitude or air pressure data by using the pressure-to-height conversion method: H s = H0+R / g×T m ×ln(P0 / P s ); Where: H s is the altitude of the standard isobaric surface; H0 is the altitude of the measuring station; R is the gas constant; g is the gravitational acceleration; T m is the average temperature of the air column; P0 is the ground pressure at the measuring station; P s is the air pressure at the mean height of the air column.

4. A low-altitude meteorological detection method as claimed in claim 2, characterized in that: Calculate altitude using standard atmospheric pressure: ； Among them, P0 is the standard atmospheric pressure; P is the actually measured atmospheric pressure; T is the actually measured temperature.

5. A low-altitude meteorological detection method as claimed in claim 1, characterized in that: The lift-off detection equipment is integrated with a Beidou positioning module, and the wind speed and direction are calculated through the latitude and longitude position coordinates output by the Beidou positioning module: Wind speed = position difference between two times / time interval + parameter correction; Wind direction = X and Y axis projection of (position vector difference between the two times + parameter correction).

6. A low-altitude meteorological detection method as claimed in claim 5, characterized in that: The lift-off detection device is integrated with an airflow field vector sensor and an attitude sensor. The airflow field in the airspace is detected by the airflow field vector sensor, and the wind speed and wind direction are obtained after the incoming flow direction detected by the attitude sensor is corrected.

7. A low-altitude meteorological detection method as claimed in claim 6, characterized in that: The wind speed and direction calculated by the Beidou positioning module are integrated with the wind speed and direction calculated by the airflow field vector sensor to obtain accurate and high-precision airspace wind speed and direction parameters.

8. A low-altitude meteorological detection method as claimed in claim 1, characterized in that: The lift-off detection device integrates an acceleration sensor and a gyroscope or geomagnetism, and uses the Euler angle method to convert the data of the accelerometer and the gyroscope or geomagnetism into the attitude angle of the device, and the attitude angle includes a pitch angle, a roll angle and a yaw angle.

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