Air defense special machine-mounted relay controller

Abstract

The application is suitable for the technical field of air defense warning signal relay transmission, and provides a special airborne relay controller for air defense, which can be mounted on a UAV and communicated with a central controller, and comprises a top antenna, a bottom antenna, a communication unit, a power supply unit, a relay control mainboard and a shell. The communication unit, the power supply unit and the relay control mainboard are arranged in the shell, and the shell can be mounted below the UAV. The top antenna and the bottom antenna are connected with the communication unit, the communication unit is connected with the relay control mainboard, signals sent by the central controller can be sent to a terminal through the bottom antenna, and signals sent by the terminal can be reported to the central controller through the top antenna. In the application scenario of the UAV, the antenna of the relay controller is taken into high altitude, so that the signal coverage range is wider, the maneuverability is stronger, the anti-destroying capability is stronger, and the reliability is higher.

Description

Technical Field

[0001] This application relates to the field of air raid alarm signal relay transmission technology, specifically to a special airborne relay controller for civil defense. Background Technology

[0002] As a signal relay station for the central controller, the repeater controller generally requires a sufficiently high antenna installation height. While current repeaters are typically located at high points in cities, such as the rooftop of a 30-story building, the coverage area is still insufficient due to the height, resulting in weak signal strength at some terminal sites. Larger cities require a higher location for the repeater antenna installation, and since these antennas are usually fixed, they are vulnerable to enemy destruction during wartime. Utility Model Content

[0003] In view of this, the embodiments of this application provide a dedicated airborne relay controller for civil defense, which has a wider signal coverage, stronger mobility, and stronger resistance to destruction. It can avoid the upper and lower radio stations operating on the same frequency, thereby improving the reliability of communication.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] A dedicated airborne relay controller for civil defense is disclosed. The relay controller is mounted on a UAV and communicates with a central controller. It includes an upward antenna, a downward antenna, a communication unit, a power supply unit, a relay control motherboard, and a housing. The communication unit, power supply unit, and relay control motherboard are housed within the housing, which can be mounted below the UAV. The power supply unit provides power to the communication module and the relay control motherboard. The upward and downward antennas are connected to the communication unit, which is connected to the relay control motherboard. The controller transmits signals from the central controller to a terminal via the downward antenna and transmits signals from the terminal to the central controller via the upward antenna.

[0006] In some embodiments, the power supply unit includes a battery and a charging management module, wherein the charging management module includes a battery interface, an AC interface, a step-down module, a first voltage regulator, a filter circuit, and a second voltage regulator;

[0007] The battery interface is connected to the battery, the AC interface can be connected to an external AC power source, the battery interface and the AC interface are connected to the step-down module, the step-down module is connected to the input terminal of the first voltage regulator, and the output terminal of the first voltage regulator is connected to the input terminal of the second voltage regulator through the filter circuit.

[0008] The voltage regulation module adjusts the voltage input from the battery interface or the AC interface to 12V, the first voltage regulator adjusts the 12V voltage to 5V, and the first voltage regulator adjusts the 12V voltage to 3.3V.

[0009] In some embodiments, the step-down module includes a resistor R1, a diode D2, a diode D3, and a diode D4;

[0010] The first end of resistor R1 is connected to pin 1 of AC interface P2, and the second end of resistor R1 is connected to the anode of diode D2. The cathode of diode D2 is connected to pin 1 of battery interface P1. Pins 2 of AC interface P2 and pin 2 of battery interface P1 are grounded. The anode of diode D3 is connected to pin 1 of AC interface P2, the anode of diode D4 is connected to pin 1 of battery interface P1, and the cathode of diode D3 is connected to the cathode of diode D4. Both the cathodes of diode D3 and diode D4 are connected to the input of the first voltage regulator U1, which is grounded through capacitor C1. The cathodes of diodes D3 and D4 output a 12V level. Diode D1 is connected between pins 1 and 2 of AC interface P2. The anode of diode D1 is connected to pin 2 of AC interface P2, and the cathode of diode D1 is connected to pin 1 of AC interface P2.

[0011] In some embodiments, the filter circuit includes diode D5, diode D6, inductor L1, resistor R2, resistor R3, capacitor C2, and polarized capacitor C3;

[0012] The output of the first voltage regulator U1 is grounded through diode D5, with the anode of diode D5 grounded and the cathode of diode D5 connected to the output of the first voltage regulator U1. The first terminal of inductor L1 is connected to the output of the first voltage regulator U1, and the second terminal is connected to the input of the second voltage regulator U2. The first terminal of resistor R2 is connected to the second terminal of inductor L1, and the second terminal of resistor R2 is grounded through resistor R3. Capacitor C2 is connected in parallel with resistor R2. The anode of polarized capacitor C3 is connected to the second terminal of inductor L1, and the cathode is grounded. The cathode of diode D6 is connected to the second terminal of inductor L1, and the anode is grounded. The FEEDBACK terminal of the first voltage regulator U1 is connected to the common point of resistors R2 and R3, and the output of the first voltage regulator U1 outputs a 5V level.

[0013] In some embodiments, the input terminal of the second voltage regulator U2 is connected to the first terminal of capacitor C4, and the second terminal of capacitor C4 is grounded; the output terminal of the second voltage regulator U2 outputs a 3.3V level, and the output terminal of the second voltage regulator U2 is grounded through parallel capacitors C5, C6, C7, C8, and C9, with the negative terminals of polarized capacitors C7 and C9 grounded; the output terminal of the second voltage regulator U2 is also grounded through a series resistor R4 and capacitor C10; the output terminal of the second voltage regulator U2 is also grounded through parallel polarized capacitors C11 and C12 and the second terminal of capacitor C4, with the positive terminals of polarized capacitors C11 and C12 connected to the output terminal of the second voltage regulator U2.

[0014] In some embodiments, the relay control motherboard includes a first radio interface, a second radio interface, an electronic switch, and a control chip. The first radio interface is connected to an upper antenna via a communication unit, and the second radio interface is connected to a lower antenna via a communication unit. The speaker output pins of the first radio interface and the second radio interface are connected to the input pins of the electronic switch, and the output pins of the electronic switch are connected to the microphone input pins of the first radio interface and the microphone input pins of the second radio interface.

[0015] The first radio interface receives signals from the central controller and sends them to the electronic switch through the speaker output pin. The electronic switch then sends the signals to the second radio interface through the microphone input pin and then to the terminal through the antenna.

[0016] The second radio interface receives the signal from the terminal and sends it to the electronic switch through the speaker output pin. The electronic switch then sends the signal to the first radio interface through the microphone input pin, and finally to the central controller through the antenna.

[0017] In some embodiments, the relay control motherboard includes a first radio interface T1, a second radio interface T2, an electronic switch U3, resistors R5 to R10, polarized capacitors C13, C14, C15, C16, and an operational amplifier D7.

[0018] The SPK speaker output pin of the first radio interface T1 is connected to the X3 input pin of the electronic switch U3 in sequence through a polarized capacitor C13 and a resistor R5. The positive terminal of the polarized capacitor C13 is connected to the SPK pin of the first radio interface T1.

[0019] The SPK speaker output pin of the second radio interface T2 is connected to the X2 input pin of the electronic switch U3 in sequence through a polarized capacitor C15 and a resistor R8. The positive terminal of the polarized capacitor C15 is connected to the SPK pin of the second radio interface T2.

[0020] The output pin of electronic switch U3 is connected to resistors R6 and R7 in sequence. Resistor R7 is an adjustable resistor. The first end of resistor R7 is connected to resistor R6, and the second end of resistor R7 is grounded. The adjustment terminal of resistor R7 is connected to the non-inverting input terminal of operational amplifier D7. The microphone input pin of the first radio interface T1 is connected to the inverting input terminal of operational amplifier D7 through polarized capacitor C16. The positive terminal of polarized capacitor C16 is connected to the microphone pin of the first radio interface T1. The output terminal of operational amplifier D7 is shorted to the inverting input terminal of operational amplifier D7. The output terminal of operational amplifier D7 is grounded through resistor R9. The control terminal of operational amplifier D7 is connected to the control chip, and the control terminal of operational amplifier D7 is connected to a 5V level through resistor R10. The adjustment terminal of resistor R7 is also connected to the microphone input pin of the second radio interface T2 through capacitor C14.

[0021] In some embodiments, the relay control motherboard further includes resistors R11 to R14, polarized capacitor C17, and polarized capacitor C18;

[0022] The first end of resistor R11 is connected to the SPK pin of the first radio interface T1. The second end of resistor R11 is connected to the positive terminal of polarized capacitor C17. The negative terminal of polarized capacitor C17 is grounded through resistor R12. The first end of resistor R13 is connected to the negative terminal of polarized capacitor C17. The second end of resistor R13 is connected to a 3.3V level through resistor R14. The positive terminal of polarized capacitor C18 is connected to the second end of resistor R13. The negative terminal of polarized capacitor C18 is grounded.

[0023] In some embodiments, the relay control motherboard further includes a programming interface, which is connected to the control chip via a TTL-232 level converter, and the other end of the programming interface is connected to a computer.

[0024] In some embodiments, the relay controller further includes a display unit, which is connected to the control chip via a display unit interface.

[0025] The beneficial effects of the embodiments of this application compared with the prior art include:

[0026] The aforementioned airborne relay controller for civil defense can be mounted on a UAV and communicate with a central controller. It includes an upper antenna, a lower antenna, a communication unit, a power supply unit, a relay control motherboard, and a housing. The communication unit, power supply unit, and relay control motherboard are housed within the housing, which can be mounted below the UAV. The upper and lower antennas are connected to the communication unit, which in turn is connected to the relay control motherboard. This allows the controller to transmit signals from the central controller to terminals via the lower antenna and to transmit signals from terminals to the central controller via the upper antenna, thus enabling signal relay transmission between the central controller and terminals. Because the relay controller is mounted below the UAV, the antenna is sufficiently high, resulting in wider signal coverage, greater mobility, and stronger resistance to destruction. The upper and lower radio delay communication mechanism avoids frequency clashes, improving communication reliability. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the airborne relay controller for civil defense provided in the embodiments of this application;

[0029] Figure 2 This is a circuit diagram of the charging management module provided in an embodiment of this application;

[0030] Figure 3 This is a circuit diagram of the relay control motherboard provided in the embodiments of this application. Detailed Implementation

[0031] The present application will be described more clearly below with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the function of the present application, but do not limit the present application in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application. These all fall within the protection scope of the present application.

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following description will be provided in conjunction with the accompanying drawings and specific embodiments.

[0033] See Figure 1The airborne relay controller for civil defense provided in this application embodiment can be mounted on a UAV and communicate with a central controller. It includes an upward antenna, a downward antenna, a communication unit, a power supply unit, a relay control motherboard, and a housing. The communication unit, the power supply unit, and the relay control motherboard are housed within the housing, which can be mounted below the UAV. The power supply unit provides power to the communication module and the relay control motherboard. The upward antenna and the downward antenna are connected to the communication unit, and the communication unit is connected to the relay control motherboard. Signals sent by the central controller are transmitted to the terminal via the downward antenna, and signals sent by the terminal are reported to the central controller via the upward antenna.

[0034] In some embodiments, the power supply unit may include a battery and a charging management module, wherein the charging management module includes a battery interface, an AC interface, a step-down module, a first voltage regulator, a filter circuit, and a second voltage regulator.

[0035] The battery interface is connected to the battery, the AC interface can be connected to an external AC power source, the battery interface and the AC interface are connected to the step-down module, the step-down module is connected to the input terminal of the first voltage regulator, and the output terminal of the first voltage regulator is connected to the input terminal of the second voltage regulator through the filter circuit.

[0036] The voltage regulation module adjusts the voltage input from the battery interface or the AC interface to 12V, the first voltage regulator adjusts the 12V voltage to 5V, and the first voltage regulator adjusts the 12V voltage to 3.3V. Adjusting the voltage input from the battery interface or the AC interface to 12V, 5V, and 3.3V supplies power to the various hardware components of the relay controller.

[0037] For details, see Figure 2 The step-down module may include a resistor R1, a diode D2, a diode D3, and a diode D4.

[0038] The first terminal of resistor R1 is connected to pin 1 of AC interface P2, and the second terminal of resistor R1 is connected to the anode of diode D2. The cathode of diode D2 is connected to pin 1 of battery interface P1. Pins 2 of AC interface P2 and pin 2 of battery interface P1 are grounded. The anode of diode D3 is connected to pin 1 of AC interface P2, and the anode of diode D4 is connected to pin 1 of battery interface P1. The cathodes of diodes D3 and D4 are connected to the cathodes of diodes D4. Both the cathodes of diodes D3 and D4 are connected to the input of the first voltage regulator U1, which is grounded through capacitor C1. The cathodes of diodes D3 and D4 output a 12V level. Diode D1 is connected between pins 1 and 2 of AC interface P2. The anode of diode D1 is connected to pin 2 of AC interface P2, and the cathode of diode D1 is connected to pin 1 of AC interface P2.

[0039] In some embodiments, the filter circuit may include diode D5, diode D6, inductor L1, resistor R2, resistor R3, capacitor C2, and polarized capacitor C3.

[0040] The output of the first voltage regulator U1 is grounded through diode D5, with the anode of diode D5 grounded and the cathode connected to the output of the first voltage regulator U1. The first terminal of inductor L1 is connected to the output of the first voltage regulator U1, and the second terminal is connected to the input of the second voltage regulator U2. The first terminal of resistor R2 is connected to the second terminal of inductor L1, and the second terminal of resistor R2 is grounded through resistor R3. Capacitor C2 is connected in parallel with resistor R2. The anode of polarized capacitor C3 is connected to the second terminal of inductor L1, and the cathode is grounded. The cathode of diode D6 is connected to the second terminal of inductor L1, and the anode is grounded. The feedback terminal of the first voltage regulator U1 is connected to the common point of resistors R2 and R3, and the output of the first voltage regulator U1 is 5V.

[0041] In some embodiments, the input terminal of the second voltage regulator U2 is connected to the first terminal of capacitor C4, and the second terminal of capacitor C4 is grounded. The output terminal of the second voltage regulator U2 outputs a 3.3V level, and the output terminal of the second voltage regulator U2 is grounded through parallel capacitors C5, C6, C7, C8, and C9, with the negative terminals of polarized capacitors C7 and C9 grounded. The output terminal of the second voltage regulator U2 is also grounded through a series resistor R4 and capacitor C10. The output terminal of the second voltage regulator U2 is also grounded through parallel polarized capacitors C11 and C12 and the second terminal of capacitor C4, with the positive terminals of polarized capacitors C11 and C12 connected to the output terminal of the second voltage regulator U2.

[0042] For example, the first regulator U1 can be an adjustable output buck switching regulator of model LM2596-ADJ, and the second regulator U2 can be a low dropout linear regulator of model REG1117-3.3.

[0043] In some embodiments, the relay control motherboard includes a first radio interface, a second radio interface, an electronic switch, and a control chip. The first radio interface is connected to an upper antenna via a communication unit, and the second radio interface is connected to a lower antenna via a communication unit. The speaker output pins of the first and second radio interfaces are connected to the input pins of the electronic switch, and the output pins of the electronic switch are connected to the microphone input pins of the first and second radio interfaces.

[0044] The first radio interface receives signals from the central controller and sends them to the electronic switch via the speaker output pin. The electronic switch then sends the signals to the second radio interface via the microphone input pin, and finally to the terminal via the antenna.

[0045] The second radio interface receives the signal from the terminal and sends it to the electronic switch through the speaker output pin. The electronic switch then sends the signal to the first radio interface through the microphone input pin, and finally to the central controller through the antenna.

[0046] For details, see Figure 3 The relay control motherboard may include a first radio interface T1, a second radio interface T2, an electronic switch U3, resistors R5 to R10, polarized capacitors C13, C14, C15, C16, and an operational amplifier D7.

[0047] The SPK speaker output pin of the first radio interface T1 is connected to the X3 input pin of the electronic switch U3 via a polarized capacitor C13 and a resistor R5. The positive terminal of the polarized capacitor C13 is connected to the SPK pin of the first radio interface T1.

[0048] The SPK speaker output pin of the second radio interface T2 is connected to the X2 input pin of the electronic switch U3 via a polarized capacitor C15 and a resistor R8. The positive terminal of the polarized capacitor C15 is connected to the SPK pin of the second radio interface T2.

[0049] The output pin of electronic switch U3 is connected to resistors R6 and R7 in sequence. Resistor R7 is an adjustable resistor; its first terminal is connected to resistor R6, and its second terminal is grounded. The adjustment terminal of resistor R7 is connected to the non-inverting input of operational amplifier D7. The microphone input pin of the first radio interface T1 is connected to the inverting input of operational amplifier D7 through a polarized capacitor C16, with the positive terminal of capacitor C16 connected to the microphone pin of the first radio interface T1. The output terminal of operational amplifier D7 is shorted to its inverting input and grounded through resistor R9. The control terminal of operational amplifier D7 is connected to the control chip and is connected to a 5V level through resistor R10. The adjustment terminal of resistor R7 is also connected to the microphone input pin of the second radio interface T2 through capacitor C14.

[0050] The signal relay process from the central controller to the terminal is as follows: The first radio interface T1 receives the signal from the central controller and sends it to the X3 pin of the electronic switch U3 through the SPK pin, polarized capacitor C13 and resistor R5. The electronic switch U3 outputs the signal through the X pin, and it passes through resistor R6, resistor R7 and capacitor C14 in sequence to enter the MIC pin of the second radio interface T2 (at this time, the control chip controls the operational amplifier D7 to turn off). The second radio interface T2 sends the signal to the terminal through the antenna.

[0051] The signal relay process from the terminal to the central controller is as follows: The second radio interface T2 receives the signal from the terminal and sends it to the X2 pin of the electronic switch U3 through the SPK pin, polarized capacitor C15, and resistor R8. The electronic switch U3 outputs the signal through the X pin, which then passes through resistor R6, resistor R7, operational amplifier D7 (at this time, the control chip controls operational amplifier D7 to be turned on), and polarized capacitor C16 to the MIC pin of the first radio interface T1. The first radio interface T1 sends the signal to the central controller through the antenna.

[0052] In some embodiments, the relay control motherboard may further include resistors R11 to R14, polarized capacitor C17, and polarized capacitor C18.

[0053] The first end of resistor R11 is connected to the SPK pin of the first radio interface T1. The second end of resistor R11 is connected to the positive terminal of polarized capacitor C17. The negative terminal of polarized capacitor C17 is grounded through resistor R12. The first end of resistor R13 is connected to the negative terminal of polarized capacitor C17. The second end of resistor R13 is connected to a 3.3V level through resistor R14. The positive terminal of polarized capacitor C18 is connected to the second end of resistor R13. The negative terminal of polarized capacitor C18 is grounded.

[0054] For example, the first radio interface T1 and the second radio interface T2 can be ND-889A (25W) data radio interfaces, and both T1 and T2 are connected to the control chip; the operational amplifier D7 can be an operational amplifier of model TSH94ID. The electronic switch U3 can be an electronic switch of model CD4052BC, with pins A and B connected to the control chip.

[0055] In some embodiments, the relay control motherboard may further include a programming interface, which is connected to the control chip via a TTL-232 level converter, and the other end of the programming interface is connected to a computer.

[0056] For example, the programming interface can be a PC COM interface, also known as a serial port or RS-232 interface, which connects to an external computer to receive signals sent by the computer; the TTL-232 level converter can be a MAX3232ACSE TTL-232 level converter, and the control chip can be an STM32F103VE-T6-LQFP100 controller chip.

[0057] In some embodiments, the relay controller may further include a display unit, which is connected to the control chip via a display unit interface.

[0058] The aforementioned airborne relay controller for civil defense can be mounted on a UAV and communicate with a central controller. It includes an upward antenna, a downward antenna, a communication unit, a power supply unit, a relay control motherboard, and a housing. The communication unit, power supply unit, and relay control motherboard are housed within the housing, which can be mounted below the UAV. The upward and downward antennas are connected to the communication unit, which in turn is connected to the relay control motherboard. This allows the controller to transmit signals from the central controller to terminals via the downward antenna and to transmit signals from terminals to the central controller via the upward antenna, thus enabling signal relay transmission between the central controller and terminals. Because the relay controller is mounted below the UAV, the antenna is sufficiently high, resulting in wider signal coverage, greater mobility, and stronger resistance to destruction. The delayed communication mechanism between the upper and lower radios avoids frequency clashes, improving communication reliability.

[0059] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A special airborne relay controller for civil defense, characterized in that, The relay controller is mounted on the UAV and communicates with the central controller. It includes an up-antenna, a down-antenna, a communication unit, a power supply unit, a relay control motherboard, and a housing. The communication unit, the power supply unit, and the relay control motherboard are housed in the housing, which can be mounted below the UAV. The power supply unit supplies power to the communication unit and the relay control motherboard. The up-antenna and the down-antenna are connected to the communication unit, and the communication unit is connected to the relay control motherboard. The relay controller transmits signals from the central controller to the terminal via the down-antenna and transmits signals from the terminal to the central controller via the up-antenna.

2. The airborne relay controller for civil defense as described in claim 1, characterized in that, The power supply unit includes a battery and a charging management module. The charging management module includes a battery interface, an AC interface, a step-down module, a first voltage regulator, a filter circuit, and a second voltage regulator. The battery interface is connected to the battery, the AC interface can be connected to an external AC power source, the battery interface and the AC interface are connected to the step-down module, the step-down module is connected to the input terminal of the first voltage regulator, and the output terminal of the first voltage regulator is connected to the input terminal of the second voltage regulator through the filter circuit. The voltage regulation module adjusts the voltage input from the battery interface or the AC interface to 12V, the first voltage regulator adjusts the 12V voltage to 5V, and the first voltage regulator adjusts the 12V voltage to 3.3V.

3. The airborne relay controller for civil defense as described in claim 1, characterized in that, The step-down module includes a resistor R1, a diode D2, a diode D3, and a diode D4; The first end of resistor R1 is connected to pin 1 of AC interface P2, and the second end of resistor R1 is connected to the anode of diode D2. The cathode of diode D2 is connected to pin 1 of battery interface P1. Pins 2 of AC interface P2 and pin 2 of battery interface P1 are grounded. The anode of diode D3 is connected to pin 1 of AC interface P2, the anode of diode D4 is connected to pin 1 of battery interface P1, and the cathode of diode D3 is connected to the cathode of diode D4. Both the cathodes of diode D3 and diode D4 are connected to the input of the first voltage regulator U1, which is grounded through capacitor C1. The cathodes of diodes D3 and D4 output a 12V level. Diode D1 is connected between pins 1 and 2 of AC interface P2. The anode of diode D1 is connected to pin 2 of AC interface P2, and the cathode of diode D1 is connected to pin 1 of AC interface P2.

4. The airborne relay controller for civil defense as described in claim 3, characterized in that, The filter circuit includes diode D5, diode D6, inductor L1, resistor R2, resistor R3, capacitor C2, and polarized capacitor C3. The output of the first voltage regulator U1 is grounded through diode D5, with the anode of diode D5 grounded and the cathode of diode D5 connected to the output of the first voltage regulator U1. The first terminal of inductor L1 is connected to the output of the first voltage regulator U1, and the second terminal is connected to the input of the second voltage regulator U2. The first terminal of resistor R2 is connected to the second terminal of inductor L1, and the second terminal of resistor R2 is grounded through resistor R3. Capacitor C2 is connected in parallel with resistor R2. The anode of polarized capacitor C3 is connected to the second terminal of inductor L1, and the cathode is grounded. The cathode of diode D6 is connected to the second terminal of inductor L1, and the anode is grounded. The FEEDBACK terminal of the first voltage regulator U1 is connected to the common point of resistors R2 and R3, and the output of the first voltage regulator U1 outputs a 5V level.

5. The airborne relay controller for civil defense as described in claim 4, characterized in that, The input terminal of the second voltage regulator U2 is connected to the first terminal of capacitor C4, and the second terminal of capacitor C4 is grounded. The output terminal of the second voltage regulator U2 outputs a 3.3V level, and the output terminal of the second voltage regulator U2 is grounded through parallel capacitors C5, C6, C7, C8, and C9, with the negative terminals of C7 and C9 grounded. The output terminal of the second voltage regulator U2 is also grounded through a series resistor R4 and capacitor C10. The output terminal of the second voltage regulator U2 is also grounded through parallel polarized capacitors C11 and C12 and the second terminal of capacitor C4, with the positive terminals of C11 and C12 connected to the output terminal of the second voltage regulator U2.

6. The airborne relay controller for civil defense as described in claim 1, characterized in that, The relay control motherboard includes a first radio interface, a second radio interface, an electronic switch, and a control chip. The first radio interface is connected to the upper antenna through a communication unit, and the second radio interface is connected to the lower antenna through a communication unit. The speaker output pins of the first radio interface and the second radio interface are connected to the input pins of the electronic switch, and the output pins of the electronic switch are connected to the microphone input pins of the first radio interface and the microphone input pins of the second radio interface. The first radio interface receives signals from the central controller and sends them to the electronic switch through the speaker output pin. The electronic switch then sends the signals to the second radio interface through the microphone input pin and then to the terminal through the antenna. The second radio interface receives the signal from the terminal and sends it to the electronic switch through the speaker output pin. The electronic switch then sends the signal to the first radio interface through the microphone input pin, and finally to the central controller through the antenna.

7. The airborne relay controller for civil defense as described in claim 6, characterized in that, The relay control motherboard includes a first radio interface T1, a second radio interface T2, an electronic switch U3, resistors R5 to R10, polarized capacitors C13, C14, C15, C16, and an operational amplifier D7. The SPK speaker output pin of the first radio interface T1 is connected to the X3 input pin of the electronic switch U3 in sequence through a polarized capacitor C13 and a resistor R5. The positive terminal of the polarized capacitor C13 is connected to the SPK pin of the first radio interface T1. The SPK speaker output pin of the second radio interface T2 is connected to the X2 input pin of the electronic switch U3 in sequence through a polarized capacitor C15 and a resistor R8. The positive terminal of the polarized capacitor C15 is connected to the SPK pin of the second radio interface T2. The output pin of electronic switch U3 is connected to resistors R6 and R7 in sequence. Resistor R7 is an adjustable resistor. The first end of resistor R7 is connected to resistor R6, and the second end of resistor R7 is grounded. The adjustment terminal of resistor R7 is connected to the non-inverting input terminal of operational amplifier D7. The microphone input pin of the first radio interface T1 is connected to the inverting input terminal of operational amplifier D7 through polarized capacitor C16. The positive terminal of polarized capacitor C16 is connected to the microphone pin of the first radio interface T1. The output terminal of operational amplifier D7 is shorted to the inverting input terminal of operational amplifier D7. The output terminal of operational amplifier D7 is grounded through resistor R9. The control terminal of operational amplifier D7 is connected to the control chip, and the control terminal of operational amplifier D7 is connected to a 5V level through resistor R10. The adjustment terminal of resistor R7 is also connected to the microphone input pin of the second radio interface T2 through capacitor C14.

8. The airborne relay controller for civil defense as described in claim 7, characterized in that, The relay control mainboard also includes resistors R11 to R14, polarized capacitor C17, and polarized capacitor C18; The first end of resistor R11 is connected to the SPK pin of the first radio interface T1. The second end of resistor R11 is connected to the positive terminal of polarized capacitor C17. The negative terminal of polarized capacitor C17 is grounded through resistor R12. The first end of resistor R13 is connected to the negative terminal of polarized capacitor C17. The second end of resistor R13 is connected to a 3.3V level through resistor R14. The positive terminal of polarized capacitor C18 is connected to the second end of resistor R13. The negative terminal of polarized capacitor C18 is grounded.

9. The airborne relay controller for civil defense as described in claim 6, characterized in that, The relay control motherboard also includes a programming interface, which is connected to the control chip via a TTL-232 level converter, and the other end of the programming interface is connected to a computer.

10. The airborne relay controller for civil defense as described in claim 6, characterized in that, The relay controller also includes a display unit, which is connected to the control chip via a display unit interface.

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