Civil air defense special machine-mounted early warning and notice issuing system

Abstract

The application is suitable for the early warning technical field, and provides a special airborne early warning and reporting system for civil air defense, which comprises a ground base station and an alarm device capable of being mounted on an unmanned aerial vehicle and being in communication connection with the ground base station, the alarm device comprising a communication module, a power supply unit, a control mainboard, a power amplifier unit and a loudspeaker; the power supply unit supplies power for the communication module, the control mainboard, the power amplifier unit and the loudspeaker; the communication module, the control mainboard, the power amplifier unit and the loudspeaker are sequentially connected; the communication module can receive various external signals and send the various external signals to the control mainboard, the control mainboard is provided with a plurality of signal transmission channels, and each external signal corresponds to a signal transmission channel; the control mainboard sends the external signals to the power amplifier unit through the corresponding signal transmission channels, amplifies the external signals and then broadcasts the amplified external signals through the loudspeaker. The application can improve the mobility and emergency capability of the alarm system, and has a wide range of signal coverage.

Description

Technical Field

[0001] This application relates to the field of early warning technology, specifically to a dedicated airborne early warning and notification system for civil defense. Background Technology

[0002] Civil defense sirens, also known as air raid sirens, are alarm systems used in wartime to warn of enemy air raid threats, aiming to remind the public to take timely protective measures. In addition, civil defense sirens can also be used for emergency notifications during peacetime events such as floods, earthquakes, and typhoons. Existing civil defense sirens systems typically transmit alarm signals through fixed base stations. However, these base stations lack mobility and have poor emergency response capabilities; moreover, the number of base stations is limited, resulting in insufficient signal coverage, significant blind spots, and poor signal coverage. Utility Model Content

[0003] In view of this, the embodiments of this application provide a dedicated airborne early warning and notification system for civil defense, which can improve the mobility and emergency response capabilities of the alarm system, and has a wide signal coverage.

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

[0005] A special airborne early warning and notification system for civil defense includes a ground base station and an alarm that can be mounted on a drone and communicate with the ground base station. The alarm includes a communication module, a power supply unit, a control motherboard, a power amplifier unit, and a speaker. The power supply unit supplies power to the communication module, the control motherboard, the power amplifier unit, and the speaker. The communication module, the control motherboard, the power amplifier unit, and the speaker are connected in sequence.

[0006] The communication module can receive various external signals and send them to the control motherboard. The control motherboard has multiple signal transmission channels, with each external signal corresponding to one signal transmission channel. The control motherboard sends the external signals to the power amplifier unit through the corresponding signal transmission channel for amplification, and then broadcasts them through the speaker.

[0007] In some embodiments, the power supply unit includes a battery and a charging management module. The charging management module includes an input interface, a charging board, a filtering circuit, and an output interface connected in sequence. The input interface is connected to the battery, and the output interface is connected to the communication module, the control motherboard, the power amplifier unit, and the speaker.

[0008] The charging board is connected to an external power source via an adapter. When the charging board is connected to the external power source, it charges the battery. When the charging board is not connected to the external power source, the battery supplies power to the communication module, the control motherboard, the power amplifier unit, and the speaker through the charging management module.

[0009] In some embodiments, the charging management module includes a power input interface CN1, two parallel diodes D1, a first charging board interface CN2, a charging board, a second charging board interface CN3, resistors R1 to R9, capacitors C1, C2, C3, C4, a MOSFET Q1, a transistor Q2, a transistor Q3, diodes D2 and D3, a Zener diode D4, and a power output interface CN4.

[0010] The power input interface CN1 is connected to pin 1 of the first interface CN2 of the charging board through two parallel diodes D1. Pin 2 of the first interface CN2 is grounded. After the charging board is connected to an external power source via the adapter, it charges the battery sequentially through the first interface CN2, the two parallel diodes D1, and the power input interface CN1. Pin 1 of the second interface CN3 of the charging board is connected to the positive terminal of polarized capacitor C3, the first terminal of resistor R1, the first terminal of capacitor C1, the positive terminal of polarized capacitor C4, and MOSFET Q1. The source of transistor Q2 is connected, and the negative terminal of polarized capacitor C3 is grounded. The second segment of resistor R1 is connected to the collector of transistor Q2 through resistor R2. The common point of resistors R1 and R2 is connected to the second terminal of capacitor C2 and the gate of transistor Q1. The emitter of transistor Q2 is grounded. The negative terminal of polarized capacitor C4 is grounded through resistors R4 and R5 in sequence. Resistor R3 is connected in parallel with polarized capacitor C4. The base of transistor Q2 is connected to the common point of resistors R4 and R5. Transistor Q2 is an NPN transistor.

[0011] The drain of MOSFET Q1 is connected to the anode of diode D2 and the power output interface CN4. The cathode of diode D2 is connected to the emitter of transistor Q3 through resistor R7. The collector of transistor Q3 is connected to the anode of diode D3. The cathode of diode D3 is grounded through capacitor C2. The cathode of diode D3 is also connected to the common point of resistors R4 and R5 through resistor R6.

[0012] The first end of resistor R8 is connected to the common point of diode D2 and resistor R7. The second end of resistor R8 is connected to the base of transistor D3 and the first end of resistor R9. The second end of resistor R9 is connected to the negative terminal of Zener diode D4. The positive terminal of Zener diode D4 is grounded. Transistor Q3 is a PNP transistor.

[0013] In some embodiments, the charging management module further includes resistors R10 to R18, Zener diodes D5 to D7, polarized capacitor C5, rectifier bridge B1, motherboard data acquisition interface CN5, and speaker acquisition interface CN6;

[0014] The first end of resistor R10 is connected to the negative terminals of two parallel diodes D1. The second end of resistor R10 is grounded through resistor R11. The second end of resistor R10 is also connected to pin 1 of the motherboard data acquisition interface CN5 through resistor R12.

[0015] The first end of resistor R13 is connected to pin 1 of the second interface CN3 of the charging board, and the second end of resistor R13 is connected to pin 3 of the motherboard data acquisition interface CN5 through resistor R14. Pins 5 and 6 of the motherboard data acquisition interface CN5 are grounded.

[0016] Pin 1 of the speaker acquisition interface CN6 is connected to the first AC input terminal of the rectifier bridge B1 and the positive terminal of the Zener diode D5. The negative terminal of the Zener diode D5 is connected to the negative terminal of the Zener diode D6. The positive terminal of the Zener diode D6 is connected to pin 2 of the speaker acquisition interface CN6 and the second AC input terminal of the rectifier bridge B1 through resistor R15. Resistor R16 is connected in parallel between pins 1 and 2 of the speaker acquisition interface CN6.

[0017] The positive output terminal of rectifier bridge B1 is connected to pin 8 of the motherboard data acquisition interface CN5 through resistor R17. Resistor R18, Zener diode D7 and polarized capacitor C5 are connected in parallel between resistor R17 and pin 8 of motherboard data acquisition interface CN5. The other end of resistor R18 is grounded, the positive terminal of Zener diode D7 is grounded, the negative terminal of polarized capacitor C5 is grounded, and the negative output terminal of rectifier bridge B1 is grounded.

[0018] In some embodiments, the control motherboard includes a main controller and a multi-select electronic switch. The control terminal of the multi-select electronic switch is connected to the main controller, the input terminal of the multi-select electronic switch is connected to the plurality of signal transmission channels respectively, and the output terminal of the multi-select electronic switch is connected to the speaker.

[0019] The multiple signal transmission channels include a radio voice signal transmission channel, an alarm voice signal transmission channel, an MP3 signal transmission channel, and a radio signal transmission channel.

[0020] In some embodiments, the radio voice signal transmission channel includes: a radio voice interface CN7, a resistor R19, a resistor R20, and a capacitor C6;

[0021] The first end of resistor R19 is connected to the radio voice signal input pin of the multi-select electronic switch, and the second end of resistor R19 is connected to the output terminal of radio voice interface CN7 through capacitor C6. The input terminal of radio voice interface CN7 is connected to the communication module for receiving radio voice signals. One end of resistor R20 is connected to the common point of resistor R19 and capacitor C6, and the other end is connected to an external voltage.

[0022] In some embodiments, the alarm voice signal transmission channel includes: resistors R21 to R24, capacitors C7 to C9, and a budget amplifier U1;

[0023] The first end of resistor R21 is connected to the alarm voice signal input pin of the multi-select electronic switch, and the second end is connected to the output of the budget amplifier U1 through capacitor C7. The non-inverting input of budget amplifier U1 is connected to an external voltage through resistor R24, and the inverting input receives the alarm voice signal through resistor R23 and capacitor C9 in sequence. Resistor R22 and capacitor C8 are connected in parallel, with one end of resistor R22 and capacitor C8 connected to the inverting input of budget amplifier U1 and the other end connected to the output of budget amplifier U1.

[0024] In some embodiments, the MP3 signal transmission channel includes: resistor R25, resistor R26, capacitor C10, capacitor C11, voice chip, and MP3 signal interface CN8;

[0025] The MP3 signal input pin of the multi-select electronic switch is connected to the output terminal of the voice chip in sequence through resistor R25, capacitor C10, and resistor R26. The input terminal of the voice chip is connected to the MP3 signal interface CN8, which is used to receive MP3 signals. The common point of capacitor C10 and resistor R26 is grounded through capacitor C11.

[0026] In some embodiments, the radio signal transmission channel includes: resistors R27 to R30, capacitors C12 to C14, a budget amplifier U2, a radio tuning chip, and a radio signal interface CN9;

[0027] The radio signal input pin of the multi-select electronic switch is connected to the output of the budget amplifier U2 in sequence through resistor R27 and capacitor C12; the non-inverting input of budget amplifier U2 is connected to the output of the radio tuning chip; the inverting input of budget amplifier U2 is grounded through resistor R29; and resistor R28 is connected between the inverting input and output of budget amplifier U2.

[0028] The input terminal of the radio tuner chip is connected to the radio signal interface CN9 through a series resistor R30 and capacitor C14. The common point of resistor R30 and the input terminal of the radio tuner chip is grounded through capacitor C12, and the common point of resistor R30 and capacitor C14 is grounded through capacitor C13.

[0029] In some embodiments, the control board further includes resistors R31 to R45, capacitors C15 to C18, operational amplifiers U3, U4, U5, and U6, a digital potentiometer U7, and an analog switch U8.

[0030] The inverting input of operational amplifier U3 is connected to the output of a multiplexer. The non-inverting input of operational amplifier U3 is connected to an external power supply through resistor R31. The output of operational amplifier U3 is connected to the VH terminal of digital potentiometer U7 through resistor R32 and capacitor C15. Resistor R33 is connected between the inverting input and output of operational amplifier U3. The VL terminal of digital potentiometer U7 is connected to an external power supply through resistor R34. The VW terminal of digital potentiometer U7 is connected to the non-inverting input of operational amplifier U4. The common point of the VW terminal of digital potentiometer U7 and the non-inverting input of operational amplifier U4 is connected to an external power supply through resistor R35. Resistor R36 is connected between the VH and VW terminals of digital potentiometer U7.

[0031] The output of operational amplifier U4 is connected to the input of analog switch U8, and the inverting input of operational amplifier U4 is connected to its output. The output of analog switch U8 is connected to the non-inverting input of operational amplifier U5 via capacitor C16 and resistor R37. The common point between the output of analog switch U8 and capacitor C16 is connected to an external power supply via resistor R38. The common point between resistor R37 and operational amplifier U5 is connected to an external power supply via resistor R39. The inverting input of operational amplifier U5 is connected to its output via resistor R40. The inverting input of operational amplifier U5 is connected to the inverting input of operational amplifier U6 via resistor R41. The non-inverting input of operational amplifier U6 is connected to an external power supply via resistor R42. The inverting input of operational amplifier U6 is connected to its output via resistor R43.

[0032] The output terminals of operational amplifier U5 are also connected to resistors R44 and C17 in sequence, and resistors R45 and C18 in sequence.

[0033] The beneficial effects of the embodiments of this application compared with the prior art include:

[0034] The airborne early warning and notification system for civil defense, as described in this embodiment, includes a ground base station and an alarm that can be mounted on a drone and communicate with the ground base station. The alarm includes a communication module, a power supply unit, a control motherboard, a power amplifier unit, and a speaker. The communication module can receive various external signals and send them to the control motherboard. The control motherboard has multiple signal transmission channels, with one channel corresponding to each external signal. The control motherboard sends the external signals through the corresponding signal transmission channels to the power amplifier unit for amplification, and then broadcasts them through the speaker. Because the alarm is mounted on a drone, this application improves the mobility and emergency response capabilities of the alarm system and provides wide-area signal coverage. Attached Figure Description

[0035] 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.

[0036] Figure 1 This is a structural block diagram of the airborne early warning and notification system for civil defense provided in the embodiments of this application;

[0037] Figure 2 This is a circuit diagram of the charging management module provided in an embodiment of this application;

[0038] Figure 3 This is a circuit diagram of the control motherboard provided in an embodiment of this application;

[0039] Figure 4 This is another circuit diagram of the control motherboard provided in the embodiments of this application. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] See Figure 1The airborne early warning and notification system for civil defense provided in this embodiment includes a ground base station and an alarm that can be mounted on a drone and communicate with the ground base station. The alarm includes a communication module, a power supply unit, a control motherboard, a power amplifier unit, and a speaker. The power supply unit supplies power to the communication module, the control motherboard, the power amplifier unit, and the speaker. The communication module, the control motherboard, the power amplifier unit, and the speaker are connected sequentially.

[0043] The communication module can receive various external signals and send them to the control motherboard. The control motherboard has multiple signal transmission channels, with one channel corresponding to each type of external signal. The control motherboard sends the external signals to the power amplifier unit through the corresponding signal transmission channel for amplification, and then broadcasts them through the speaker.

[0044] In some embodiments, the power supply unit may include a battery and a charging management module. The charging management module includes an input interface, a charging board, a filtering circuit, and an output interface connected in sequence. The input interface is connected to the battery, and the output interface is connected to the communication module, the control motherboard, the power amplifier unit, and the speaker.

[0045] The charging board is connected to an external power source via an adapter. When the charging board is connected to the external power source, it charges the battery. When the charging board is not connected to the external power source, the battery supplies power to the communication module, the control motherboard, the power amplifier unit, and the speaker through the charging management module.

[0046] See Figure 2 The charging management module may include a power input interface CN1, two parallel diodes D1, a first charging board interface CN2, a charging board, a second charging board interface CN3, resistors R1 to R9, capacitors C1, C2, C3, C4, a MOSFET Q1, a transistor Q2, a transistor Q3, diodes D2 and D3, a Zener diode D4, and a power output interface CN4.

[0047] The power input interface CN1 is connected to pin 1 of the first interface CN2 of the charging board via two parallel diodes D1. Pin 2 of the first interface CN2 is grounded. After the charging board is connected to an external power source via the adapter, it charges the battery sequentially through the first interface CN2, the two parallel diodes D1, and the power input interface CN1. Pin 1 of the second interface CN3 of the charging board is connected to the positive terminal of polarized capacitor C3, the first terminal of resistor R1, the first terminal of capacitor C1, the positive terminal of polarized capacitor C4, and the source of MOSFET Q1. The negative terminal of polarized capacitor C3 is grounded. The second segment of resistor R1 is connected to the collector of transistor Q2 via resistor R2. The common point of resistors R1 and R2 is connected to the second terminal of capacitor C2 and the gate of MOSFET Q1. The emitter of transistor Q2 is grounded. The negative terminal of polarized capacitor C4 is grounded through resistors R4 and R5 in sequence. Resistor R3 is connected in parallel with polarized capacitor C4. The base of transistor Q2 is connected to the common point of resistors R4 and R5. Transistor Q2 is an NPN transistor.

[0048] The drain of MOSFET Q1 is connected to the anode of diode D2 and the power output interface CN4. The cathode of diode D2 is connected to the emitter of transistor Q3 through resistor R7. The collector of transistor Q3 is connected to the anode of diode D3. The cathode of diode D3 is grounded through capacitor C2. The cathode of diode D3 is also connected to the common point of resistors R4 and R5 through resistor R6.

[0049] The first end of resistor R8 is connected to the common point of diode D2 and resistor R7. The second end of resistor R8 is connected to the base of transistor D3 and the first end of resistor R9. The second end of resistor R9 is connected to the negative terminal of Zener diode D4. The positive terminal of Zener diode D4 is grounded. Transistor Q3 is a PNP transistor.

[0050] See Figure 2 The charging management module may also include resistors R10 to R18, Zener diodes D5 to D7, polarized capacitor C5, rectifier bridge B1, motherboard data acquisition interface CN5, and speaker acquisition interface CN6.

[0051] The first end of resistor R10 is connected to the negative terminals of two parallel diodes D1. The second end of resistor R10 is grounded through resistor R11. The second end of resistor R10 is also connected to pin 1 of the motherboard data acquisition interface CN5 through resistor R12.

[0052] The first end of resistor R13 is connected to pin 1 of the second interface CN3 of the charging board, and the second end of resistor R13 is connected to pin 3 of the motherboard data acquisition interface CN5 through resistor R14. Pins 5 and 6 of the motherboard data acquisition interface CN5 are grounded.

[0053] Pin 1 of the speaker acquisition interface CN6 is connected to the first AC input terminal of rectifier bridge B1 and the positive terminal of Zener diode D5. The negative terminal of Zener diode D5 is connected to the negative terminal of Zener diode D6. The positive terminal of Zener diode D6 is connected to pin 2 of speaker acquisition interface CN6 and the second AC input terminal of rectifier bridge B1 through resistor R15. Resistor R16 is connected in parallel between pins 1 and 2 of speaker acquisition interface CN6.

[0054] The positive output terminal of rectifier bridge B1 is connected to pin 8 of the motherboard data acquisition interface CN5 through resistor R17. Resistor R18, Zener diode D7 and polarized capacitor C5 are connected in parallel between resistor R17 and pin 8 of motherboard data acquisition interface CN5. The other end of resistor R18 is grounded, the positive terminal of Zener diode D7 is grounded, the negative terminal of polarized capacitor C5 is grounded, and the negative output terminal of rectifier bridge B1 is grounded.

[0055] In this embodiment, the speaker current signal, battery voltage VBAT, and AC voltage VAC can be collected and sent to the main controller of the control motherboard, which then monitors these signals.

[0056] For example, rectifier bridge B1 can be an HD06 model rectifier bridge.

[0057] In some embodiments, the control motherboard may include a main controller and a multiplexer electronic switch. The control terminal of the multiplexer electronic switch is connected to the main controller, the input terminals of the multiplexer electronic switch are respectively connected to the plurality of signal transmission channels, and the output terminal of the multiplexer electronic switch is connected to the speaker. The plurality of signal transmission channels include a radio voice signal transmission channel, an alarm voice signal transmission channel, an MP3 signal transmission channel, and a radio signal transmission channel.

[0058] See Figure 3 The radio voice signal transmission channel may include a radio voice interface CN7, a resistor R19, a resistor R20, and a capacitor C6.

[0059] The first end of resistor R19 is connected to the radio voice signal input pin of the multi-select electronic switch U10. The second end of resistor R19 is connected to the output terminal of the radio voice interface CN7 through capacitor C6. The input terminal of the radio voice interface CN7 is connected to the communication module for receiving radio voice signals. One end of resistor R20 is connected to the common point of resistor R19 and capacitor C6, and the other end is connected to an external voltage.

[0060] See Figure 3 The alarm voice signal transmission channel may include resistors R21 to R24, capacitors C7 to C9, and a budget amplifier U1.

[0061] The first end of resistor R21 is connected to the alarm voice signal input pin of the multi-select electronic switch U10, and the second end is connected to the output of the budget amplifier U1 through capacitor C7. The non-inverting input of budget amplifier U1 is connected to an external voltage through resistor R24, and the inverting input receives the alarm voice signal through resistor R23 and capacitor C9 in sequence. Resistor R22 and capacitor C8 are connected in parallel, with one end of resistor R22 and capacitor C8 connected to the inverting input of budget amplifier U1 and the other end connected to the output of budget amplifier U1.

[0062] See Figure 3 The MP3 signal transmission channel may include resistor R25, resistor R26, capacitor C10, capacitor C11, voice chip, and MP3 signal interface CN8.

[0063] The MP3 signal input pin of the multi-select electronic switch U10 is connected to the output terminal of the voice chip in sequence through resistor R25, capacitor C10, and resistor R26. The input terminal of the voice chip is connected to the MP3 signal interface CN8, which is used to receive MP3 signals. The common point of capacitor C10 and resistor R26 is grounded through capacitor C11.

[0064] See Figure 3 The radio signal transmission channel may include resistors R27 to R30, capacitors C12 to C14, a budget amplifier U2, a radio tuning chip, and a radio signal interface CN9.

[0065] The radio signal input pin of the multi-select electronic switch U10 is connected to the output of the budget amplifier U2 in sequence through resistor R27 and capacitor C12; the non-inverting input of the budget amplifier U2 is connected to the output of the radio tuning chip, the inverting input of the budget amplifier U2 is grounded through resistor R29, and resistor R28 is connected between the inverting input and the output of the budget amplifier U2.

[0066] The input terminal of the radio tuner chip is connected to the radio signal interface CN9 through a series resistor R30 and capacitor C14. The common point of resistor R30 and the input terminal of the radio tuner chip is grounded through capacitor C12, and the common point of resistor R30 and capacitor C14 is grounded through capacitor C13.

[0067] For example, the multi-select electronic switch can use an 8-channel analog multiplexer of model CD4051BC. The radio voice signal input pin of the multi-select electronic switch U10 is pin X3, the alarm voice signal input pin is pin X4, the MP3 signal input pin is pin X5, and the radio signal input pin is pin X6. The EN, VEE, and GND pins of the multi-select electronic switch U10 are connected to AGND, the A, B, and C pins are connected to the main controller, the VCC pin is connected to the 5V power supply, and the X pin is the output terminal.

[0068] The voice chip can be the WT2003H4-24SS model. Resistor R26 is connected to pin 14 of the WT2003H4-24SS. The DAT0 pin of the MP3 signal interface CN8 is connected to pin 6 of the WT2003H4-24SS. The CMD pin of CN8 is connected to pin 7 of the WT2003H4-24SS. The CLK pin of CN8 is connected to pin 8 of the WT2003H4-24SS.

[0069] The radio tuning chip can be the RDA5807FP model stereo FM radio tuning chip.

[0070] See Figure 4 The control board may also include resistors R31 to R45, capacitors C15 to C18, operational amplifiers U3, U4, U5, and U6, a digital potentiometer U7, and an analog switch U8.

[0071] The inverting input of operational amplifier U3 is connected to the output of multiplexer U10. The non-inverting input of operational amplifier U3 is connected to an external power supply via resistor R31. The output of operational amplifier U3 is connected to the VH terminal of digital potentiometer U7 via resistor R32 and capacitor C15. Resistor R33 is connected between the inverting input and output of operational amplifier U3. The VL terminal of digital potentiometer U7 is connected to an external power supply via resistor R34. The VW terminal of digital potentiometer U7 is connected to the non-inverting input of operational amplifier U4. The common point between the VW terminal of digital potentiometer U7 and the non-inverting input of operational amplifier U4 is connected to an external power supply via resistor R35. Resistor R36 is connected between the VH and VW terminals of digital potentiometer U7.

[0072] The output of operational amplifier U4 is connected to the input of analog switch U8, and the inverting input of operational amplifier U4 is connected to its output. The output of analog switch U8 is connected to the non-inverting input of operational amplifier U5 via capacitor C16 and resistor R37. The common point between the output of analog switch U8 and capacitor C16 is connected to an external power supply via resistor R38. The common point between resistor R37 and operational amplifier U5 is connected to an external power supply via resistor R39. The inverting input of operational amplifier U5 is connected to its output via resistor R40. The inverting input of operational amplifier U5 is connected to the inverting input of operational amplifier U6 via resistor R41. The non-inverting input of operational amplifier U6 is connected to an external power supply via resistor R42, and the inverting input of operational amplifier U6 is connected to its output via resistor R43.

[0073] The output of operational amplifier U5 is also connected to resistors R44 and C17 in sequence, and resistors R45 and C18 in sequence to output a VOICE signal. The VOICE signal is then amplified by the power amplifier unit and broadcast through the speaker.

[0074] For example, the digital potentiometer U7 can be a MAX5407 model digital potentiometer, and the analog switch U8 can be a CD4066 model four-way bidirectional analog switch.

[0075] 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 dedicated airborne early warning and dissemination system for civil defense, characterized in that, The system includes a ground base station and an alarm that can be mounted on a drone and communicate with the ground base station. The alarm includes a communication module, a power supply unit, a control motherboard, a power amplifier unit, and a speaker. The power supply unit provides power to the communication module, the control motherboard, the power amplifier unit, and the speaker. The communication module, the control motherboard, the power amplifier unit, and the speaker are connected in sequence; The communication module can receive various external signals and send them to the control motherboard. The control motherboard is equipped with multiple signal transmission channels, and each external signal corresponds to one signal transmission channel. The control motherboard sends external signals to the power amplifier unit through the corresponding signal transmission channel, amplifies them, and then broadcasts them through the speaker.

2. The airborne early warning and notification system 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 an input interface, a charging board, a filtering circuit, and an output interface connected in sequence. The input interface is connected to the battery, and the output interface is connected to the communication module, the control motherboard, the power amplifier unit, and the speaker. The charging board is connected to an external power source via an adapter. When the charging board is connected to the external power source, it charges the battery. When the charging board is not connected to the external power source, the battery supplies power to the communication module, the control motherboard, the power amplifier unit, and the speaker through the charging management module.

3. The airborne early warning and notification system for civil defense as described in claim 2, characterized in that, The charging management module includes a power input interface CN1, two parallel diodes D1, a first charging board interface CN2, a charging board, a second charging board interface CN3, resistors R1 to R9, capacitors C1, C2, C3, C4, a MOSFET Q1, a transistor Q2, a transistor Q3, diodes D2 and D3, a Zener diode D4, and a power output interface CN4. The power input interface CN1 is connected to pin 1 of the first interface CN2 of the charging board through two parallel diodes D1. Pin 2 of the first interface CN2 is grounded. After the charging board is connected to an external power source via the adapter, it charges the battery sequentially through the first interface CN2, the two parallel diodes D1, and the power input interface CN1. Pin 1 of the second interface CN3 of the charging board is connected to the positive terminal of polarized capacitor C3, the first terminal of resistor R1, the first terminal of capacitor C1, the positive terminal of polarized capacitor C4, and MOSFET Q1. The source of transistor Q2 is connected, and the negative terminal of polarized capacitor C3 is grounded. The second segment of resistor R1 is connected to the collector of transistor Q2 through resistor R2. The common point of resistors R1 and R2 is connected to the second terminal of capacitor C2 and the gate of transistor Q1. The emitter of transistor Q2 is grounded. The negative terminal of polarized capacitor C4 is grounded through resistors R4 and R5 in sequence. Resistor R3 is connected in parallel with polarized capacitor C4. The base of transistor Q2 is connected to the common point of resistors R4 and R5. Transistor Q2 is an NPN transistor. The drain of MOSFET Q1 is connected to the anode of diode D2 and the power output interface CN4. The cathode of diode D2 is connected to the emitter of transistor Q3 through resistor R7. The collector of transistor Q3 is connected to the anode of diode D3. The cathode of diode D3 is grounded through capacitor C2. The cathode of diode D3 is also connected to the common point of resistors R4 and R5 through resistor R6. The first end of resistor R8 is connected to the common point of diode D2 and resistor R7. The second end of resistor R8 is connected to the base of transistor D3 and the first end of resistor R9. The second end of resistor R9 is connected to the negative terminal of Zener diode D4. The positive terminal of Zener diode D4 is grounded. Transistor Q3 is a PNP transistor.

4. The airborne early warning and notification system for civil defense as described in claim 3, characterized in that, The charging management module also includes resistors R10 to R18, Zener diodes D5 to D7, polarized capacitor C5, rectifier bridge B1, motherboard data acquisition interface CN5, and speaker acquisition interface CN6; The first end of resistor R10 is connected to the negative terminals of two parallel diodes D1. The second end of resistor R10 is grounded through resistor R11. The second end of resistor R10 is also connected to pin 1 of the motherboard data acquisition interface CN5 through resistor R12. The first end of resistor R13 is connected to pin 1 of the second interface CN3 of the charging board, and the second end of resistor R13 is connected to pin 3 of the motherboard data acquisition interface CN5 through resistor R14. Pins 5 and 6 of the motherboard data acquisition interface CN5 are grounded. Pin 1 of the speaker acquisition interface CN6 is connected to the first AC input terminal of the rectifier bridge B1 and the positive terminal of the Zener diode D5. The negative terminal of the Zener diode D5 is connected to the negative terminal of the Zener diode D6. The positive terminal of the Zener diode D6 is connected to pin 2 of the speaker acquisition interface CN6 and the second AC input terminal of the rectifier bridge B1 through resistor R15. Resistor R16 is connected in parallel between pins 1 and 2 of the speaker acquisition interface CN6. The positive output terminal of rectifier bridge B1 is connected to pin 8 of the motherboard data acquisition interface CN5 through resistor R17. Resistor R18, Zener diode D7 and polarized capacitor C5 are connected in parallel between resistor R17 and pin 8 of motherboard data acquisition interface CN5. The other end of resistor R18 is grounded, the positive terminal of Zener diode D7 is grounded, the negative terminal of polarized capacitor C5 is grounded, and the negative output terminal of rectifier bridge B1 is grounded.

5. The airborne early warning and notification system for civil defense as described in claim 1, characterized in that, The control motherboard includes a main controller and a multi-select electronic switch. The control terminal of the multi-select electronic switch is connected to the main controller, the input terminal of the multi-select electronic switch is connected to the multiple signal transmission channels respectively, and the output terminal of the multi-select electronic switch is connected to the speaker. The multiple signal transmission channels include a radio voice signal transmission channel, an alarm voice signal transmission channel, an MP3 signal transmission channel, and a radio signal transmission channel.

6. The airborne early warning and notification system for civil defense as described in claim 5, characterized in that, The radio voice signal transmission channel includes: radio voice interface CN7, resistor R19, resistor R20 and capacitor C6; The first end of resistor R19 is connected to the radio voice signal input pin of the multi-select electronic switch, and the second end of resistor R19 is connected to the output terminal of radio voice interface CN7 through capacitor C6. The input terminal of radio voice interface CN7 is connected to the communication module for receiving radio voice signals. One end of resistor R20 is connected to the common point of resistor R19 and capacitor C6, and the other end is connected to an external voltage.

7. The airborne early warning and notification system for civil defense as described in claim 5, characterized in that, The alarm voice signal transmission channel includes: resistors R21 to R24, capacitors C7 to C9, and a budget amplifier U1; The first end of resistor R21 is connected to the alarm voice signal input pin of the multi-select electronic switch, and the second end is connected to the output of the budget amplifier U1 through capacitor C7. The non-inverting input of budget amplifier U1 is connected to an external voltage through resistor R24, and the inverting input receives the alarm voice signal through resistor R23 and capacitor C9 in sequence. Resistor R22 and capacitor C8 are connected in parallel, with one end of resistor R22 and capacitor C8 connected to the inverting input of budget amplifier U1 and the other end connected to the output of budget amplifier U1.

8. The airborne early warning and notification system for civil defense as described in claim 5, characterized in that, The MP3 signal transmission channel includes: resistor R25, resistor R26, capacitor C10, capacitor C11, voice chip, and MP3 signal interface CN8; The MP3 signal input pin of the multi-select electronic switch is connected to the output terminal of the voice chip in sequence through resistor R25, capacitor C10, and resistor R26. The input terminal of the voice chip is connected to the MP3 signal interface CN8, which is used to receive MP3 signals. The common point of capacitor C10 and resistor R26 is grounded through capacitor C11.

9. The airborne early warning and notification system for civil defense as described in claim 5, characterized in that, The radio signal transmission channel includes: resistors R27 to R30, capacitors C12 to C14, a budget amplifier U2, a radio tuning chip, and a radio signal interface CN9; The radio signal input pin of the multi-select electronic switch is connected to the output of the budget amplifier U2 in sequence through resistor R27 and capacitor C12; the non-inverting input of budget amplifier U2 is connected to the output of the radio tuning chip; the inverting input of budget amplifier U2 is grounded through resistor R29; and resistor R28 is connected between the inverting input and the output of budget amplifier U2. The input terminal of the radio tuner chip is connected to the radio signal interface CN9 through a series resistor R30 and capacitor C14. The common point of resistor R30 and the input terminal of the radio tuner chip is grounded through capacitor C12, and the common point of resistor R30 and capacitor C14 is grounded through capacitor C13.

10. The airborne early warning and notification system for civil defense as described in claim 5, characterized in that, The control board also includes resistors R31 to R45, capacitors C15 to C18, operational amplifiers U3, U4, U5, and U6, a digital potentiometer U7, and an analog switch U8. The inverting input of operational amplifier U3 is connected to the output of a multiplexer. The non-inverting input of operational amplifier U3 is connected to an external power supply through resistor R31. The output of operational amplifier U3 is connected to the VH terminal of digital potentiometer U7 through resistor R32 and capacitor C15. Resistor R33 is connected between the inverting input and output of operational amplifier U3. The VL terminal of digital potentiometer U7 is connected to an external power supply through resistor R34. The VW terminal of digital potentiometer U7 is connected to the non-inverting input of operational amplifier U4. The common point of the VW terminal of digital potentiometer U7 and the non-inverting input of operational amplifier U4 is connected to an external power supply through resistor R35. Resistor R36 is connected between the VH and VW terminals of digital potentiometer U7. The output of operational amplifier U4 is connected to the input of analog switch U8, and the inverting input of operational amplifier U4 is connected to its output. The output of analog switch U8 is connected to the non-inverting input of operational amplifier U5 via capacitor C16 and resistor R37. The common point between the output of analog switch U8 and capacitor C16 is connected to an external power supply via resistor R38. The common point between resistor R37 and operational amplifier U5 is connected to an external power supply via resistor R39. The inverting input of operational amplifier U5 is connected to its output via resistor R40. The inverting input of operational amplifier U5 is connected to the inverting input of operational amplifier U6 via resistor R41. The non-inverting input of operational amplifier U6 is connected to an external power supply via resistor R42. The inverting input of operational amplifier U6 is connected to its output via resistor R43. The output terminals of operational amplifier U5 are also connected to resistors R44 and C17 in sequence, and resistors R45 and C18 in sequence.

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