Natural disaster early warning method and system based on Beidou communication

Abstract

The invention is suitable for the technical field of disaster early warning, and provides a natural disaster early warning method and system based on Beidou communication, and the method comprises the steps: obtaining the signal intensity of a mobile communication module and the remaining power of a battery of an early warning broadcast terminal; determining a target communication starting condition of the early warning broadcast terminal according to the signal intensity and the battery remaining capacity; if the target communication starting condition is a mobile communication starting condition or a Beidou communication starting condition, controlling the early warning broadcast terminal to communicate with a management platform of the early warning broadcast terminal through a mobile communication module or a Beidou short message module to realize early warning broadcast; and if the target communication opening condition is a Lora communication opening condition, controlling an early warning broadcast terminal to obtain monitoring data of the slope area from adjacent monitoring equipment of the early warning broadcast terminal through a Lora communication module, and realizing early warning broadcast based on the monitoring data. According to the application, the early warning broadcast terminal can still perform early warning broadcast in time when the public network fails.

Description

Technical Field

[0001] The present application belongs to the field of disaster warning technology, and in particular, relates to a natural disaster warning method and system based on Beidou communication. Background Art

[0002] Early warning broadcast terminals are mainly used in meteorological disaster early warning monitoring, flash flood disaster early warning detection, geological disaster early warning detection and other detection systems. The platform releases early warning information to the early warning broadcast terminal based on data monitoring. The terminal receives the information and broadcasts the early warning information through the early warning loudspeaker to remind relevant personnel to avoid danger. Traditional early warning broadcast terminals mostly use public networks such as 2G / 3G / 4G to interact with the platform. The platform is used as a carrier for the release of early warning information. Such a configuration can achieve the purpose of early warning in most cases. However, when the degree of disaster affects the operation of public network equipment, the platform and the early warning broadcast terminal will have communication problems. In this way, the platform's early warning information cannot be sent to the early warning terminal, and relevant personnel cannot be reminded to avoid danger in time, resulting in loss of life and property. Summary of the invention

[0003] The embodiments of the present application provide a natural disaster warning method and system based on Beidou communication, which can solve the problem that the warning broadcast terminal cannot broadcast warnings in time when the public network fails.

[0004] In a first aspect, an embodiment of the present application provides a natural disaster warning method based on Beidou communication, which is applied to a warning broadcast terminal, the warning broadcast terminal includes a mobile communication module, a Beidou short message module and a Lora communication module, and the natural disaster warning method includes:

[0005] When the warning period arrives, the signal strength of the mobile communication module and the remaining battery power of the warning broadcast terminal are obtained;

[0006] Determine the target communication start-up condition of the early warning broadcast terminal according to the signal strength and the remaining battery power; the target communication start-up condition is one of the mobile communication start-up condition, the Beidou communication start-up condition and the Lora communication start-up condition;

[0007] If the target communication opening condition is the mobile communication opening condition, the early warning broadcast terminal is controlled to communicate with the management platform of the early warning broadcast terminal through the mobile communication module to realize the early warning broadcast;

[0008] If the target communication start condition is the Beidou communication start condition, the early warning broadcast terminal is controlled to communicate with the management platform of the early warning broadcast terminal through the Beidou short message module to realize the early warning broadcast;

[0009] If the target communication activation condition is the Lora communication activation condition, the early warning broadcast terminal is controlled to obtain the monitoring data of the slope area from the adjacent monitoring equipment of the early warning broadcast terminal through the Lora communication module, and realize the early warning broadcast based on the monitoring data.

[0010] Optionally, the target communication start condition of the early warning broadcast terminal is determined according to the signal strength and the remaining battery power, including:

[0011] If the remaining battery power is greater than the power threshold and the signal strength is greater than the signal strength threshold, determining that the target communication activation condition of the early warning broadcast terminal is the mobile communication activation condition;

[0012] If the remaining battery power is greater than the power threshold and the signal strength is less than or equal to the signal strength threshold, the target communication start condition of the early warning broadcast terminal is determined to be the Beidou communication start condition;

[0013] If the remaining battery power is less than or equal to the power threshold, the target communication activation condition of the early warning broadcast terminal is determined to be the Lora communication activation condition.

[0014] Optionally, when the target communication activation condition is a mobile communication activation condition or a Beidou communication activation condition, if the early warning broadcast terminal receives the early warning information sent by the management platform, the early warning broadcast terminal is controlled to broadcast the early warning information to realize the early warning broadcast.

[0015] Optionally, when the target communication activation condition is a mobile communication activation condition or a Beidou communication activation condition, if the early warning broadcast terminal does not receive the early warning information sent by the management platform, the early warning broadcast terminal is controlled to enter a sleep state.

[0016] Optionally, the monitoring data include crack change values, inclination change values, acceleration change values ​​and rainfall change values.

[0017] Optionally, early warning broadcasts can be implemented based on monitoring data, including:

[0018] The disaster warning value is calculated based on the monitoring data, and if the disaster warning value is greater than the warning threshold, the early warning broadcast terminal is controlled to broadcast the early warning.

[0019] Optionally, disaster warning values ​​are calculated based on monitoring data, including:

[0020] The disaster warning value F is calculated by the following formula:

[0021]

[0022] Among them, Q is the cumulative number of times the crack change value is obtained, a q is the crack change value obtained for the qth time, x is the weighting coefficient of the crack change value, T is the cumulative number of times the inclination change value is obtained, and bt is the inclination change value obtained for the tth time, y is the weighting coefficient of the inclination change value, E is the cumulative number of acceleration change values ​​obtained, c e is the acceleration change value obtained for the eth time, z is the weighting coefficient of the acceleration change value, R is the cumulative number of times the rainfall change value is obtained, d r is the rainfall change value obtained for the rth time, and h is the weighting coefficient of the rainfall change value.

[0023] Optionally, the natural disaster early warning method also includes:

[0024] If the disaster warning value is less than or equal to the warning threshold, the early warning broadcast terminal is controlled to enter a dormant state.

[0025] Optionally, after determining that the target communication enabling condition of the warning broadcast terminal is the Lora communication enabling condition, the natural disaster warning method further includes:

[0026] Extend the warning period.

[0027] In a second aspect, an embodiment of the present application provides a natural disaster warning system based on Beidou communication, including a management platform and multiple warning broadcast terminals for executing the above-mentioned natural disaster warning method, and the warning broadcast terminals are communicatively connected to the management platform.

[0028] The above solution of the present application has the following beneficial effects:

[0029] In an embodiment of the present application, the early warning broadcast terminal determines the method of implementing the early warning broadcast by periodically monitoring the signal strength and the remaining battery power of the mobile communication module of the public network. When it is monitored that the signal strength of the public network does not meet the conditions for starting mobile communication, it communicates with the management platform through its own Beidou short message module to implement the early warning broadcast, thereby timely issuing early warning broadcasts when the public network fails, reminding relevant personnel to avoid risks.

[0030] In addition, when it is detected that the remaining battery power is insufficient to ensure the normal operation of the mobile communication module and the Beidou short message module, the monitoring data of the slope area is obtained from the nearby monitoring equipment through the Lora communication module, and an early warning is broadcast based on the monitoring data, so as to make an early warning broadcast in time when it is impossible to communicate with the management platform, and remind relevant personnel to avoid risks.

[0031] Other beneficial effects of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A schematic diagram of the structure of an early warning broadcast terminal provided in an embodiment of the present application;

[0034] Figure 2 A flowchart of a natural disaster warning method based on Beidou communication provided in one embodiment of the present application. DETAILED DESCRIPTION

[0035] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0036] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0037] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0038] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0039] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0040] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0041] In response to the problem that the current early warning broadcast terminal is unable to make timely early warning broadcasts when the public network fails, the embodiment of the present application provides a natural disaster early warning method based on Beidou communication. In this method, the early warning broadcast terminal determines the way to implement the early warning broadcast by periodically monitoring the signal strength and the remaining battery power of the mobile communication module of the public network. When it is monitored that the signal strength of the public network does not meet the conditions for starting mobile communication, it communicates with the management platform through its own Beidou short message module to implement early warning broadcast, so that early warning broadcasts can be made in time when the public network fails, reminding relevant personnel to avoid risks.

[0042] In addition, when it is detected that the remaining battery power is insufficient to ensure the normal operation of the mobile communication module and the Beidou short message module, the monitoring data of the slope area is obtained from the nearby monitoring equipment through the Lora communication module, and an early warning is broadcast based on the monitoring data, so as to make an early warning broadcast in time when it is impossible to communicate with the management platform, and remind relevant personnel to avoid risks.

[0043] The natural disaster warning method based on Beidou communication provided in the embodiment of the present application can be applied to warning broadcast terminals, such as Figure 1 As shown, the early warning broadcast terminal is composed of a control module (which can be a microprocessor (MCU)), a power module, a communication module, a voice broadcast module, a power control module, a data storage module and an indicator light, just like the traditional early warning broadcast terminal. The difference is that the communication module of the early warning broadcast terminal of the embodiment of the present application specifically includes a mobile communication module (such as a 4G module, a 5G module), a Beidou short message module and a Lora communication module, so that the early warning broadcast terminal can support three communication modes of public network, Beidou communication and Lora communication. It should be noted that the mobile communication module, the Beidou short message module and the Lora communication module can all be implemented using traditional structures, so their structures and working principles are not described in detail here.

[0044] Among them, the control module judges by reading the signal strength and power supply voltage in the mobile communication module, sends instructions to the communication module through the serial port to select different communication methods, such as 4G, Beidou and Lora communication methods, and receives data from the communication module for voice warning broadcast, and saves the received data and equipment system configuration data to the data storage module, realizes low power consumption through the power control module, and controls the indicator light to realize the equipment operation status and fault indication.

[0045] In some optional examples, the power module may include a lithium battery, a DC-DC power module, an LDO power module and a charge and discharge management module to power other modules of the device (output voltage 5V, 3.3V and 3.8V); the communication module is composed of a 4G module, a Beidou module and a Lora module, and communicates with the control module through a serial port to realize data reception and transmission; the voice broadcast module is composed of a voice chip, a power amplifier module and a speaker, and is used for warning information broadcast; the power control module is composed of a switching circuit, which is used to achieve low power consumption control, and the control module controls the switching of the power of different modules. For example, when the data reception and transmission task is completed and there is no warning event, the control module controls the power control module to turn off the power of other modules, and the control module enters the sleep mode, thereby achieving low power consumption; the data storage module is mainly composed of flash, TF card and EEPROM, and is used to store device system parameters, historical data and alarm information; the indicator light is used to indicate the working status of the device, including 3 indicator lights, red indicates an alarm, and green indicates normal operation of the device.

[0046] It can be understood that the early warning broadcast terminal executes the natural disaster early warning method, which can be specifically executed by the control module of the early warning broadcast terminal.

[0047] The natural disaster warning method based on Beidou communication provided in this application is exemplarily described below in conjunction with specific embodiments.

[0048] like Figure 2 As shown, the natural disaster warning method based on Beidou communication provided in the embodiment of the present application includes the following steps:

[0049] Step 21, when the warning period arrives, obtain the signal strength of the mobile communication module and the remaining battery power of the warning broadcast terminal.

[0050] In some embodiments of the present application, the above-mentioned warning period can be set according to actual conditions, for example, set to 30 minutes or 1 hour, so that the warning broadcast terminal can periodically monitor the signal strength and remaining battery power, so as to make timely warning broadcasts when natural disasters occur, effectively protecting the safety of life and property.

[0051] The above-mentioned mobile communication module can be a 4G module, a 5G module or the like for performing mobile communication; the above-mentioned signal strength is used to describe the strength of the communication signal of the mobile communication network, and can be obtained through the monitoring mechanism of the mobile communication module itself.

[0052] Step 22, determining the target communication activation condition of the early warning broadcast terminal according to the signal strength and the remaining battery power; the target communication activation condition is one of the mobile communication activation condition, the Beidou communication activation condition and the Lora communication activation condition.

[0053] Specifically, if the remaining battery power is greater than the power threshold and the signal strength is greater than the signal strength threshold, the target communication start-up condition of the early warning broadcast terminal is determined to be the mobile communication start-up condition; if the remaining battery power is greater than the power threshold and the signal strength is less than or equal to the signal strength threshold, the target communication start-up condition of the early warning broadcast terminal is determined to be the Beidou communication start-up condition; if the remaining battery power is less than or equal to the power threshold, the target communication start-up condition of the early warning broadcast terminal is determined to be the Lora communication start-up condition. That is, when the remaining battery power of the early warning broadcast terminal is low, the early warning broadcast terminal will stop using the mobile communication module and the Beidou short message module, and turn on the Lora communication module for communication; when the remaining battery power of the early warning broadcast terminal is sufficient and the signal strength is weak, the early warning broadcast terminal will stop using the mobile communication module and the Lora communication module, and turn on the Beidou short message module for communication; when the remaining battery power of the early warning broadcast terminal is sufficient and the signal strength is strong, the early warning broadcast terminal will stop using the Beidou short message module and the Lora communication module, and turn on the mobile communication module for communication.

[0054] It is understandable that the above power threshold and signal strength threshold can be set according to actual conditions. For example, the power threshold can be set to 25% of the full power, and the signal strength threshold can be set to 25% of the optimal signal strength.

[0055] Step 23: If the target communication enabling condition is the mobile communication enabling condition, the early warning broadcast terminal is controlled to communicate with the management platform of the early warning broadcast terminal through the mobile communication module to realize early warning broadcast.

[0056] Step 24: If the target communication enabling condition is the Beidou communication enabling condition, the early warning broadcast terminal is controlled to communicate with the management platform of the early warning broadcast terminal through the Beidou short message module to realize early warning broadcasting.

[0057] In some embodiments of the present application, when the target communication activation condition is a mobile communication activation condition or a Beidou communication activation condition (i.e., when the early warning broadcast terminal communicates with the management platform of the early warning broadcast terminal through a mobile communication module or a Beidou short message module), if the early warning broadcast terminal receives the early warning information sent by the management platform, the early warning broadcast terminal is controlled to broadcast the early warning information to achieve the early warning broadcast. Exemplarily, the early warning information can be a natural disaster warning term, such as a natural disaster (such as a mudslide) is about to occur in the area, please evacuate as soon as possible, so that after the early warning broadcast terminal broadcasts it, the relevant personnel can evacuate in time to avoid danger.

[0058] It is understandable that, in order to ensure that the early warning broadcast terminal can communicate with the management platform of the early warning broadcast terminal through the Beidou short message module, the management platform side is also provided with a corresponding Beidou short message module. Exemplarily, the management platform can be a remote control device, such as a server.

[0059] In some embodiments of the present application, when the target communication activation condition is a mobile communication activation condition or a Beidou communication activation condition (that is, when the early warning broadcast terminal communicates with the management platform of the early warning broadcast terminal through a mobile communication module or a Beidou short message module), if the early warning broadcast terminal does not receive the early warning information sent by the management platform, the early warning broadcast terminal is controlled to enter a sleep state to reduce power consumption.

[0060] Step 25: If the target communication enabling condition is the Lora communication enabling condition, the early warning broadcast terminal is controlled to obtain the monitoring data of the slope area from the neighboring monitoring equipment of the early warning broadcast terminal through the Lora communication module, and implement early warning broadcast based on the monitoring data.

[0061] In some embodiments of the present application, the above monitoring data include crack change values, inclination change values, acceleration change values ​​and rainfall change values. That is, the crack change values, inclination change values, acceleration change values ​​and rainfall change values ​​of the slope area to which the early warning broadcast terminal belongs can be collected by the collection equipment deployed in the slope area.

[0062] For example, the crack change value can be collected by using an intelligent crack displacement monitor (i.e., the above-mentioned proximity monitoring device), the inclination change value and acceleration change value can be collected by using an intelligent inclination acceleration monitor (i.e., the above-mentioned proximity monitoring device), and the rainfall change value can be collected by using a rain gauge (i.e., the above-mentioned proximity monitoring device). The rain gauge can also be installed on the housing of the early warning broadcast terminal so that the rain gauge can be transmitted to the early warning broadcast terminal by wire.

[0063] It can be understood that in order to facilitate the early warning broadcast terminal to obtain monitoring data from the nearby monitoring equipment through the Lora communication module, the nearby monitoring equipment is also provided with a Lora communication module.

[0064] In some embodiments of the present application, when the target communication activation condition is the Lora communication activation condition, the early warning broadcast terminal can specifically calculate the disaster warning value based on the monitoring data, and if the disaster warning value is greater than the warning threshold, the early warning broadcast terminal is controlled to broadcast the warning. It can be understood that if the disaster warning value is less than or equal to the warning threshold, the early warning broadcast terminal is controlled to enter a dormant state to achieve low power consumption control. Among them, the warning threshold can be set according to the actual situation, for example, set to 1.

[0065] The specific implementation method of calculating the disaster warning value based on the monitoring data can be:

[0066] The disaster warning value F is calculated by the following formula:

[0067]

[0068] Wherein, Q is the cumulative number of times the crack change value is obtained (usually 5 to 10, with a preferred value of 5); a q is the crack change value obtained for the qth time, in mm; x is the weighting coefficient of the crack change value (generally 0.1 to 0.5, with a preferred value of 0.1); T is the cumulative number of times the inclination change value is obtained (generally 10 to 20, with a preferred value of 10); b t is the inclination change value obtained for the tth time, in degrees; y is the weighting coefficient of the inclination change value (generally 0.05 to 0.2, preferably 0.05); E is the cumulative number of acceleration change values ​​obtained (generally 20 to 50, preferably 20); c e is the acceleration change value obtained for the eth time, in mg; z is the weighting coefficient of the acceleration change value (usually 0.001 to 0.01, with a preferred value of 0.005); R is the cumulative number of rainfall change values ​​obtained (usually 50 to 100, with a preferred value of 100); d r is the rainfall change value obtained for the rth time, in mm; h is the weighting coefficient of the rainfall change value (usually 0.01-0.05, with a preferred value of 0.05).

[0069] It can be seen that when the target communication activation condition is the Lora communication activation condition (that is, when the remaining battery power of the early warning broadcast terminal is low), the crack change value, inclination change value, acceleration change value and rainfall change value can be obtained from nearby adjacent monitoring devices through Lora communication for multiple times (specifically, the data collected by each monitoring device can be sampled at a certain frequency) to determine whether the slope is abnormal (such as cracks exceeding 1mm, displacement exceeding 1cm). When the disaster alarm value is greater than the alarm threshold, it is determined that the slope to which the early warning broadcast terminal belongs may be abnormal due to some natural disaster, and an early warning broadcast will be made. In order to make an early warning broadcast in time when it is unable to communicate with the management platform, it reminds relevant personnel to avoid risks. Exemplarily, the early warning broadcast terminal can complete the early warning broadcast by broadcasting natural disaster warning terms. If a natural disaster (such as a mudslide) is about to occur in the area, please evacuate as soon as possible so that after the early warning broadcast terminal broadcasts it, the relevant personnel can evacuate in time to avoid danger.

[0070] It is worth mentioning that the method of integrating monitoring data from multiple nearby monitoring devices for early warning is more accurate than the method of issuing early warning information based on a single monitoring device.

[0071] In some embodiments of the present application, after determining that the target communication activation condition of the early warning broadcast terminal is the Lora communication activation condition, the natural disaster early warning method also includes: extending the early warning period (for example, extending the early warning period from the original 30 minutes to 4 hours), thereby reducing the power consumption of the early warning broadcast terminal to the microampere level, extending the battery life of the device, and solving the problem of equipment power shortage and offline due to long-term rainy or cloudy weather, and failure to issue timely early warning when a natural disaster occurs, thereby effectively protecting the safety of life and property.

[0072] In summary, the early warning broadcast terminal automatically monitors the public network communication during operation. When the public network is normal, the device monitors the signal input in real time, including voice calls, text messages, Internet communications and other channels, and transmits the received information through the broadcast speaker according to the established priority; when the public network is abnormal, it automatically switches to the Beidou short message mode for communication. This mode uses Beidou satellites for data communication, transmits the equipment self-test information to the central platform (i.e., the management platform), and supports the central platform to send broadcast information. At the same time, the public network will be checked in this state, and the module fault troubleshooting / restart and other means will be used to self-recover from the fault according to the public network monitoring related information. When the public network (such as 4G network) or Beidou network communication signal is weak or the device battery is low, lora communication is selected to obtain the monitoring data of the slope area from the adjacent monitoring equipment, and the early warning broadcast is realized based on the monitoring data. At the same time, this application also realizes low-power control, which can reduce the power consumption of the device to the microampere level, extend the battery life of the device, solve the problem of equipment lack of power and offline due to long-term rainy or cloudy weather, and unable to issue timely warnings when natural disasters occur, and effectively protect the safety of life and property.

[0073] In addition, an embodiment of the present application also provides a natural disaster warning system based on Beidou communication, including a management platform and multiple warning broadcast terminals for executing the above-mentioned natural disaster warning method, and the warning broadcast terminals are communicatively connected to the management platform.

[0074] It should be noted that the information interaction, execution process, etc. between the above-mentioned warning broadcast terminal and the management platform are based on the same concept as the method embodiment of the present application. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0075] It is worth mentioning that when the remaining battery power of the early warning broadcast terminal is reduced (such as less than 15% of the full power), the early warning message to be broadcast can be sent to the neighboring early warning broadcast terminal through Lora communication, and the early warning can be broadcast through the neighboring early warning broadcast terminal to remind relevant personnel to avoid risks in time.

[0076] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A natural disaster early warning method based on Beidou communication, characterized in that: Applied to an early warning broadcast terminal, the early warning broadcast terminal includes a mobile communication module, a Beidou short message module and a Lora communication module, and the natural disaster early warning method includes: When the warning period arrives, obtaining the signal strength of the mobile communication module and the remaining battery power of the warning broadcast terminal; Determining a target communication activation condition of the early warning broadcast terminal according to the signal strength and the remaining battery power; the target communication activation condition is one of a mobile communication activation condition, a Beidou communication activation condition, and a Lora communication activation condition; If the target communication enabling condition is the mobile communication enabling condition, controlling the early warning broadcast terminal to communicate with the management platform of the early warning broadcast terminal through the mobile communication module to realize early warning broadcast; If the target communication enabling condition is the Beidou communication enabling condition, controlling the early warning broadcast terminal to communicate with the management platform of the early warning broadcast terminal through the Beidou short message module to realize early warning broadcast; If the target communication enabling condition is the Lora communication enabling condition, the early warning broadcast terminal is controlled to obtain monitoring data of the slope area from the adjacent monitoring device of the early warning broadcast terminal through the Lora communication module, and an early warning broadcast is implemented based on the monitoring data.

2. The natural disaster early warning method according to claim 1, characterized in that: The determining, according to the signal strength and the remaining battery power, a target communication start condition of the early warning broadcast terminal includes: If the remaining battery power is greater than the power threshold and the signal strength is greater than the signal strength threshold, determining that the target communication activation condition of the early warning broadcast terminal is a mobile communication activation condition; If the remaining battery power is greater than the power threshold and the signal strength is less than or equal to the signal strength threshold, determining that the target communication activation condition of the early warning broadcast terminal is the Beidou communication activation condition; If the remaining battery power is less than or equal to the power threshold, it is determined that the target communication activation condition of the early warning broadcast terminal is the Lora communication activation condition.

3. The natural disaster early warning method according to claim 1, characterized in that: When the target communication activation condition is the mobile communication activation condition or the Beidou communication activation condition, if the early warning broadcast terminal receives the early warning information sent by the management platform, the early warning broadcast terminal is controlled to broadcast the early warning information to realize the early warning broadcast.

4. The natural disaster early warning method according to claim 3, characterized in that: When the target communication activation condition is the mobile communication activation condition or the Beidou communication activation condition, if the early warning broadcast terminal does not receive the early warning information sent by the management platform, the early warning broadcast terminal is controlled to enter a dormant state.

5. The natural disaster early warning method according to claim 1, characterized in that: The monitoring data include crack change values, inclination change values, acceleration change values ​​and rainfall change values.

6. The natural disaster early warning method according to claim 5, characterized in that: The implementing early warning broadcast based on the monitoring data includes: A disaster warning value is calculated based on the monitoring data, and if the disaster warning value is greater than the warning threshold, the early warning broadcast terminal is controlled to broadcast an early warning.

7. The natural disaster early warning method according to claim 6, characterized in that: The calculating of the disaster warning value based on the monitoring data comprises: The disaster warning value F is calculated by the following formula: Among them, Q is the cumulative number of times the crack change value is obtained, a q is the crack change value obtained for the qth time, x is the weighting coefficient of the crack change value, T is the cumulative number of times the inclination change value is obtained, and b t is the inclination change value obtained for the tth time, y is the weighting coefficient of the inclination change value, E is the cumulative number of acceleration change values ​​obtained, c e is the acceleration change value obtained for the eth time, z is the weighting coefficient of the acceleration change value, R is the cumulative number of times the rainfall change value is obtained, d r is the rainfall change value obtained for the rth time, and h is the weighting coefficient of the rainfall change value.

8. The natural disaster early warning method according to claim 6, characterized in that: The natural disaster early warning method further comprises: If the disaster warning value is less than or equal to the warning threshold, the early warning broadcast terminal is controlled to enter a dormant state.

9. The natural disaster early warning method according to claim 2, characterized in that: After determining that the target communication enabling condition of the warning broadcast terminal is the Lora communication enabling condition, the natural disaster warning method further includes: The warning period is extended.

10. A natural disaster early warning system based on Beidou communication, characterized in that: It comprises a management platform and a plurality of warning broadcast terminals for executing the natural disaster warning method according to any one of claims 1 to 9, wherein the warning broadcast terminals are communicatively connected with the management platform.

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