A Beidou beacon system for airborne platforms

Abstract

The invention discloses a Beidou beacon system for an airborne platform, belongs to the field of communication technology, comprises a beacon, a host and a Beidou terminal, solves the technical problems of global short message receiving and sending, emergency positioning and beacon emission of the Beidou beacon system; the invention realizes short message communication and positioning functions within a global range, can ensure smooth communication even in a complex environment, has an automatic emergency mode and a manual emergency mode, improves the accident response speed, improves the flexibility and reliability of the system, has the functions of a traditional emergency positioning device, and enhances the reliability of rescue; in an emergency state, the beacon will record the data of the acceleration sensor into a TF card, which is helpful for analyzing the cause of the accident afterwards and optimizing the safety of the equipment; the host system can automatically control the battery power supply in a non-emergency state, reduces energy consumption, and prolongs the service life of the equipment.

Description

Technical Field

[0001] The present invention belongs to the field of communication technology, and in particular relates to a Beidou beacon system for an airborne platform. Background Art

[0002] "Beidou beacon machine" is the basic equipment for building the airborne platform system and a new quality growth point for enhancing the advantages of airborne platforms. With the continuous upgrading of airborne platforms and the expansion of mission tasks, especially the establishment of mission guidelines and Beidou satellite navigation system under the new situation, it will surely be an important driving force for the transformation of beacon machines, giving birth to new application methods and changing the future market landscape. It has become an urgent task to grasp the development trend of beacon forms, adapt to future market needs, and accelerate the construction of "Beidou beacon machine" products.

[0003] With the strengthening of global trade, various airborne platforms have been serving the world, resulting in higher requirements for the short message receiving and sending capabilities of Beidou beacons. Ensuring that Beidou beacons can serve the world is a key issue that needs to be solved. Currently, there is an urgent need to develop a new generation of Beidou beacon systems for airborne platforms. Summary of the invention

[0004] The purpose of the present invention is to provide a Beidou beacon system for an airborne platform, which solves the technical problems of global short message receiving and sending, emergency positioning and beacon transmission of the Beidou beacon system.

[0005] To achieve the above purpose, the present invention adopts the following technical inventions:

[0006] A Beidou beacon system for an airborne platform comprises a beacon, a host and a Beidou terminal, wherein the beacon and the Beidou terminal communicate with the host via two 422 buses respectively;

[0007] The beacon includes a radio frequency transmission module, a beacon antenna, a lithium battery pack, a beacon power supply circuit and a beacon control unit. The beacon control unit includes a main controller U20, and a radio frequency 8V power supply enabling circuit, a radio frequency 7V power supply enabling circuit, a beacon communication unit, a beacon temperature sensor, a beacon power supply sampling circuit, a beacon acceleration sensor, an input isolation circuit, an output isolation circuit, a battery switch circuit, an SD card slot and a TF slot, which are electrically connected to the main controller U20 respectively;

[0008] The input end of the beacon machine power supply circuit is connected to an external 24V power supply and a lithium battery pack respectively, and the output end is used to power the beacon machine control unit and the radio frequency transmission module, and the radio frequency transmission module is connected to the beacon antenna;

[0009] The output end of the beacon power supply circuit also outputs YOUT backup power supply;

[0010] The beacon machine power supply sampling circuit is used to collect the voltage generated by the beacon machine power supply circuit;

[0011] The host includes a host power supply circuit and a host control unit, and the host control unit includes a main controller U2, and a host communication unit, a host temperature sensor, a host acceleration sensor and a host power supply sampling circuit electrically connected to the main controller U2 respectively;

[0012] The input end of the host power supply circuit is connected to the external 24V power supply and YOUT standby power supply, and the output end supplies power to the host control unit;

[0013] The host communication unit includes three communication modules, which are electrically connected and communicate with the external To comprehensive display device, the beacon communication unit and the Beidou terminal respectively;

[0014] The host power sampling circuit is used to collect the voltage generated by the host power circuit.

[0015] Preferably, the beacon power supply circuit includes a first power supply interface, a first TVS module, a first DC power supply module, a voltage stabilizing module, a 3.3V voltage stabilizing module, an 8V voltage stabilizing module, a 7V voltage stabilizing module, a -5V voltage stabilizing module, a battery interface, a second TVS module, a battery management module and an emergency power supply circuit;

[0016] The first power interface is used to connect an external 24V power supply, the first power interface is connected to a first TVS module, and the first TVS module outputs a 24V0 power supply;

[0017] The first DC power module, 8V voltage stabilizing module, 7V voltage stabilizing module and -5V voltage stabilizing module are all connected to the 24V0 power supply, and the first DC power module, 8V voltage stabilizing module, 7V voltage stabilizing module and -5V voltage stabilizing module output 5V0 power, 8V0 power, 7V0 power and RF-5V0 power respectively;

[0018] The voltage regulator module and the 3.3V voltage regulator module are both connected to the 5V0 power supply, and the voltage regulator module and the 3.3V voltage regulator module output 3V3 power supply and RF3V3 power supply respectively;

[0019] The enable terminal of the 3.3V voltage regulator module is connected to an IO port of the main controller U20;

[0020] The battery interface is used to connect the lithium battery pack, the battery interface is connected to the second TVS module, and the second TVS module outputs BAT power;

[0021] The battery management module is connected to the BAT power supply and outputs BAT3V3 power supply and 12V0 power supply respectively;

[0022] The input end of the emergency power supply circuit is connected to the 3V3 power supply, RF-5V0 power supply and RF3V3 power supply, and the corresponding outputs are 3.3VTTL power supply, -5V power supply and +3.3V power supply. The 3.3VTTL power supply, -5V power supply and +3.3V power supply provide working voltage for the RF transmitting module.

[0023] Preferably, the input end of the RF 8V power supply circuit is connected to the 8V0 power supply, the output end outputs the RF8V0 power supply, and the enable end is connected to an IO port of the main controller U20;

[0024] The input end of the RF 7V power supply circuit is connected to the 7V0 power supply, the output end outputs the RF7V0 power supply, and the enable end is connected to an IO port of the main controller U7;

[0025] The input end of the emergency power supply circuit is also connected to the RF8V0 power supply and the RF7V0 power supply, and the output end also outputs +8V power supply and +7V power supply correspondingly. The +8V power supply and +7V power supply are used to provide working voltage for the RF transmitting module;

[0026] The beacon machine communication unit includes a beacon machine 422 unit and a first external communication interface. The beacon machine 422 unit communicates with a serial port USART1 of the main controller U20 through a serial port bus. The beacon machine 422 unit is connected to the first external communication interface, and the first external communication interface communicates with a communication module of the host communication unit. The beacon machine 422 unit is powered by a 3V3 power supply.

[0027] The beacon machine 422 unit is composed of a 422 module U18 and its peripheral circuits. The model of the 422 module U18 is MAX3490.

[0028] The first external communication interface is interface JP17, pins 2, 3, 4 and 5 of interface JP17 are connected to the output end of the beacon unit 422, and pins 2 and 3 of the 422 module U18 communicate with a serial port USART1 of the main controller U20 through resistors R120 and R123 respectively;

[0029] The beacon machine temperature sensor and the beacon machine acceleration sensor are connected to the main controller U20 through the I2C interface and the SPI interface respectively. The beacon machine temperature sensor and the beacon machine acceleration sensor are both powered by a 3V3 power supply;

[0030] The beacon temperature sensor is composed of sensor U21 and its peripheral circuits. The model of sensor U21 is LM75A.

[0031] The beacon machine acceleration sensor is composed of sensor U22 and its peripheral circuits. The model of sensor U22 is LSM6DSV16X.

[0032] The beacon machine power sampling circuit is used to collect the voltage values ​​of 8V0 power supply, 7V0 power supply, BAT power supply, 24V0 power supply, 12V0 power supply and 3V3 power supply respectively, and are connected to the 6 AD interfaces of the main controller U20 respectively;

[0033] The input end of the input isolation circuit is connected to the external emergency switch, and the output end is connected to an IO port of the main controller U20;

[0034] The input end of the output isolation circuit is connected to an IO port of the main controller U20, and the output end is connected to and drives an external LED lamp;

[0035] The input end of the battery switch circuit is connected to the 12VO power supply and the BAT3V3 power supply, the output end outputs the YOUT backup power supply, and the enable end is connected to an IO port of the main controller U20; the voltage value of the YOUT backup power supply is 24V;

[0036] Both the SD slot and the TF slot are connected to the main controller U20 through the same SPI bus and are powered by a 3V3 power supply.

[0037] Preferably, the first TVS module is a TVS protection circuit composed of a TVS tube DR14 and a P-channel field effect transistor Q2;

[0038] The first DC power supply module is a 24V-5V voltage stabilizing circuit composed of a DC-DC module U5 and its peripheral circuits. The model of the DC-DC module U5 is SY8113C1ADC;

[0039] The voltage regulator module is a voltage regulator circuit composed of a voltage regulator U9 and its peripheral circuits. The model of the voltage regulator U9 is LT1963AEST-3.3;

[0040] The 3.3V voltage regulator module is a voltage regulator circuit composed of the voltage regulator module U23 and its peripheral circuits.

[0041] The model of the voltage regulator module U23 is LT1963AEST-3.3;

[0042] The 8V voltage regulator module is a 24V to 8V DC-DC voltage regulator circuit composed of the voltage regulator module U17 and its peripheral circuits. The model of the voltage regulator module U17 is SY8113C1ADC;

[0043] The 7V voltage regulator module is a 24V to 7V DC-DC voltage regulator circuit composed of the voltage regulator module U19 and its peripheral circuits. The model of the voltage regulator module U19 is SY8113C1ADC;

[0044] The -5V voltage regulator module is a 24V to -5V DC-DC voltage regulator circuit composed of the voltage regulator module U24 and its peripheral circuits. The model of the voltage regulator module U24 is SY8113C1ADC;

[0045] The battery interface is interface J14, and the second TVS module is a TVS protection circuit composed of TVS tube DR27 and P-channel field effect transistor Q3;

[0046] The battery management module is composed of the battery management chip U8 and its peripheral circuits. The model of the battery management module is LTC4006;

[0047] The emergency power supply circuit includes an interface JP22, a capacitor C127, a capacitor C128, a capacitor C129, a capacitor C130, a capacitor C131, a capacitor C132, a capacitor C133, a capacitor C134, a magnetic bead L51, a magnetic bead L52, a magnetic bead L53, a magnetic bead L54 and a magnetic bead L55;

[0048] One end of the magnetic bead L51 is connected to the RF8V0 power supply, and the other end is connected to the 6th pin of the interface JP22. The capacitor C127 and the capacitor C134 are the filter capacitors at both ends of the magnetic bead L51 respectively.

[0049] One end of the magnetic bead L52 is connected to the RF-5V0 power supply, and the other end is connected to the 6th pin of the interface JP5. The capacitor C128 and the capacitor C133 are the filter capacitors at both ends of the magnetic bead L52 respectively;

[0050] One end of the magnetic bead L53 is connected to the 3V3TTL power supply, and the other end is connected to the 4th pin of the interface JP22; the 3V3TTL power supply is obtained through the 3V3 power supply;

[0051] One end of the magnetic bead L54 is connected to the RF3V3 power supply, and the other end is connected to the 3rd pin of the interface JP22. The capacitor C129 and the capacitor C132 are the filter capacitors at both ends of the magnetic bead L54 respectively.

[0052] One end of the magnetic bead L55 is connected to the RF7V0 power supply, and the other end is connected to the 2nd pin of the interface JP22. The capacitor C130 and the capacitor C131 are the filter capacitors at both ends of the magnetic bead L55 respectively.

[0053] Pin 1 of interface JP22 is connected to the ground wire, pin 2 outputs +7V power supply, pin 3 outputs +3.3V power supply, pin 4 outputs 3.3VTTL power supply, pin 5 outputs -5V power supply, and pin 6 outputs +8V power supply;

[0054] The model of the main controller U20 is STM32F103RBT6 microcontroller.

[0055] Preferably, the battery switch circuit includes a diode D13, a resistor R91, a resistor R83, a resistor R88, a resistor R84, a capacitor C74, a field effect transistor Q4, a resistor R89, an optocoupler U14, a diode D14, a resistor R87, a resistor R92, a transistor Q5, a resistor R85, a diode D11, a resistor R90, a capacitor C75 and a resistor R93;

[0056] The cathode of diode D13 is connected to the external emergency signal, the anode of diode D13 is connected to the S pole of field effect tube Q4, pin 1 of optocoupler U14 and ground respectively through resistor R83, resistor R88 and resistor R91, pin 2 of optocoupler U14 is connected to the cathode of diode D14, the anode of diode D14 is connected to ground, pin 4 of optocoupler U14 is connected to BAT3V3 power supply through resistor R89, and pin 3 is connected to ground, pin 4 of optocoupler U14 is also connected to the base of transistor Q5 through resistor R92, the base of transistor Q5 is connected to an IO port of main controller U20 through resistor R93, the connection network number is recorded as BAT_EN, the collector of transistor Q5 is connected to the G pole of field effect tube Q4 through resistor R87, and the emitter is connected to ground, resistor R90 and capacitor C75 are connected in parallel between the base and emitter of transistor Q5;

[0057] The S pole of the field effect tube Q4 is connected to the 12V0 power supply, the D pole is connected to the positive pole of the diode D11, and the negative pole of the diode D11 outputs the YOUT standby power supply;

[0058] The resistor R84 and the capacitor C74 are connected in parallel between the S pole and the G pole of the field effect transistor Q4, and the anode of the diode D11 is connected to the emitter of the transistor Q5 through the resistor R85;

[0059] The beacon power sampling circuit is a resistive voltage sampling circuit;

[0060] The input isolation circuit and the output isolation circuit are both switch quantity optocoupler isolation circuits.

[0061] Preferably, the host power supply circuit includes a second power supply interface, an emergency power supply interface, a second TVS module and a second DC power supply module, the second power supply interface is interface JP1, pin 3 of interface JP1 is connected to an external 24V power supply, pin 2 is connected to a ground wire, and pin 1 of interface JP1 is also connected to an external start switch;

[0062] The emergency power interface is interface JP9, and pin 1 of interface JP9 is connected to the YOUT backup power supply, and pin 2 is connected to the ground wire;

[0063] The second TVS module is a TVS protection circuit composed of a TVS tube DR1 and a P-channel field effect transistor IC1;

[0064] The second DC power supply module is a 24V-3.3V voltage stabilizing circuit composed of a DC-DC module IC1 and its peripheral circuits. The DC-DC module IC1 outputs a Z3V3 power supply. The model of the DC-DC module IC1 is SY8113C1ADC.

[0065] Preferably, the host communication unit includes a communication module A, a communication module B and a communication module C, the communication module A includes an external communication interface A and a host 422 unit A, and the external communication interface A is an interface JP11;

[0066] The host 422 unit A is composed of the 422 module U1 and its peripheral circuits. The 4th, 5th, 6th and 7th pins of the interface JP11 are connected to the output end of the host 422 unit A. The host 422 unit A is responsible for communicating with the external To comprehensive display device.

[0067] The host 422 unit B is composed of the 422 module U3 and its peripheral circuits. Pins 1, 2, 3 and 4 of the interface JP12 are connected to the output end of the host 422 unit B. The host 422 unit B is responsible for communicating with the Beidou terminal.

[0068] The host 422 unit C is composed of the 422 module U6 and its peripheral circuits. Pins 1, 2, 3 and 4 of interface JP7 are all connected to the output end of the host 422 unit C; interface JP7 is connected to interface JP17, and the host 422 unit C is responsible for communicating with the beacon machine 422 unit; pin 7 of interface JP7 is also connected to an external LED light, and pin 6 is also connected to an external emergency switch;

[0069] The host temperature sensor is composed of sensor U10 and its peripheral circuits. The model of sensor U10 is LM75A.

[0070] The host acceleration sensor is composed of sensor U11 and its peripheral circuits. The model of sensor U11 is LSM6DSV16X.

[0071] The main controller U2, host communication unit, host temperature sensor and host acceleration sensor are all powered by the Z3V3 power supply;

[0072] The host power sampling circuit is responsible for collecting the voltage of pin 3 of interface JP1 and the voltage of Z3V3 power supply; the host power sampling circuit is a resistive voltage collection circuit.

[0073] The Beidou beacon system for an airborne platform described in the present invention solves the technical problems of global short message reception and transmission, emergency positioning and beacon emission of the Beidou beacon system; the present invention realizes short message communication and positioning functions in a global range, and can ensure smooth communication even in complex environments. It has an automatic emergency mode and a manual emergency mode. The acceleration sensor monitors in real time, and automatically triggers an emergency signal when it detects that the abnormal acceleration exceeds a set threshold, thereby improving the accident response speed; personnel are allowed to manually activate a distress signal in an emergency, thereby improving the flexibility and reliability of the system; a distress signal is directly transmitted to surrounding platforms and search and rescue equipment, and it has the functions of a traditional emergency positioning device, thereby enhancing the reliability of rescue; in an emergency state, the beacon will record the data of the acceleration sensor into a TF card, which is helpful for analyzing the cause of the accident afterwards and optimizing the safety of the equipment; the host system can automatically control the battery power supply in a non-emergency state, thereby reducing energy consumption and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Figure 1 It is a general schematic diagram block diagram of the present invention;

[0075] Figure 2 It is a schematic block diagram of the beacon power supply circuit of the present invention;

[0076] Figure 3 It is a block diagram of the principle diagram of the beacon control unit of the present invention;

[0077] Figure 4 It is a schematic block diagram of a host power supply circuit and a host control unit of the present invention;

[0078] Figure 5 is a circuit diagram of a host power supply circuit and a host power supply sampling circuit of the present invention;

[0079] Figure 6 is a circuit diagram of communication module A, communication module B and communication module C of the present invention;

[0080] Figure 7 It is a circuit diagram of the main controller U2, the host temperature sensor and the host acceleration sensor of the present invention;

[0081] Figure 8 It is a circuit diagram of a beacon power sampling circuit, a first power interface, a first TVS module, a first DC power module, a voltage stabilizing module, a battery interface, a second TVS module and a battery management module of the present invention;

[0082] Fig. 9 is a circuit diagram of the main controller U20 of the present invention;

[0083] Fig.10 It is a circuit diagram of a beacon temperature sensor, a beacon acceleration sensor, an input isolation circuit, an output isolation circuit, a battery switch circuit, a radio frequency 8V power supply enabling circuit, a radio frequency 7V power supply enabling circuit, an SD card slot and a TF slot of the present invention;

[0084] Fig.11 It is a circuit diagram of a 3.3V voltage stabilizing module, an 8V voltage stabilizing module, a 7V voltage stabilizing module, a -5V voltage stabilizing module, an emergency power supply circuit and a beacon communication unit of the present invention. DETAILED DESCRIPTION

[0085] Depend on Figure 1-Figure 11 A Beidou beacon system for an airborne platform is shown, comprising a beacon, a host and a Beidou terminal, wherein the beacon and the Beidou terminal communicate with the host via two 422 buses respectively;

[0086] The model of the Beidou terminal is UBlox M10.

[0087] The beacon includes a radio frequency transmission module, a beacon antenna, a lithium battery pack, a beacon power supply circuit and a beacon control unit. The beacon control unit includes a main controller U20, and a radio frequency 8V power supply enabling circuit, a radio frequency 7V power supply enabling circuit, a beacon communication unit, a beacon temperature sensor, a beacon power supply sampling circuit, a beacon acceleration sensor, an input isolation circuit, an output isolation circuit, a battery switch circuit, an SD card slot and a TF slot, which are electrically connected to the main controller U20 respectively;

[0088] The model of the RF transmitter module is TI CC1120.

[0089] In this embodiment, the SD card slot is composed of a card slot U16, a resistor R97, a resistor R96 and a capacitor C76, and is powered by a 3V3 power supply; the TF slot is composed of a card slot TF1, resistors R104 to R107, a capacitor C78, ​​TVS tubes DE7 to TVS tubes DE710, and is powered by a 3V3 power supply;

[0090] The card slot U16 and the card slot TF1 share a SPI interface and both communicate with the main controller U20. When in use, the card slot U16 and the card slot TF1 are used to insert the SD card and the TF card respectively. The main controller U20 automatically determines whether the current emergency state is entered by monitoring the signal of the acceleration sensor U22. In the emergency state, the main controller U20 controls the RF 8V power supply enabling circuit, the -5V voltage regulator module and the RF 7V power supply enabling circuit to power on the RF transmitting module through the emergency power supply circuit. The RF transmitting module generates a 243MHz distress signal and transmits it to the outside world through the beacon antenna. At the same time, the main controller U20 will record the data read from the acceleration sensor U22 into the TF card or SD card.

[0091] The input end of the beacon machine power supply circuit is connected to an external 24V power supply and a lithium battery pack respectively, and the output end is used to power the beacon machine control unit and the radio frequency transmission module, and the radio frequency transmission module is connected to the beacon antenna;

[0092] The output end of the beacon power supply circuit also outputs YOUT backup power supply;

[0093] The beacon machine power supply sampling circuit is used to collect the voltage generated by the beacon machine power supply circuit;

[0094] The beacon power supply circuit includes a first power supply interface, a first TVS module, a first DC power supply module, a voltage stabilizing module, a 3.3V voltage stabilizing module, an 8V voltage stabilizing module, a 7V voltage stabilizing module, a -5V voltage stabilizing module, a battery interface, a second TVS module, a battery management module and an emergency power supply circuit;

[0095] The first power interface is used to connect an external 24V power supply, the first power interface is connected to a first TVS module, and the first TVS module outputs a 24V0 power supply;

[0096] The first DC power module, 8V voltage stabilizing module, 7V voltage stabilizing module and -5V voltage stabilizing module are all connected to the 24V0 power supply, and the first DC power module, 8V voltage stabilizing module, 7V voltage stabilizing module and -5V voltage stabilizing module output 5V0 power, 8V0 power, 7V0 power and RF-5V0 power respectively;

[0097] The voltage regulator module and the 3.3V voltage regulator module are both connected to the 5V0 power supply, and the voltage regulator module and the 3.3V voltage regulator module output 3V3 power supply and RF3V3 power supply respectively;

[0098] The enable terminal of the 3.3V voltage regulator module is connected to an IO port of the main controller U20;

[0099] The battery interface is used to connect the lithium battery pack, the battery interface is connected to the second TVS module, and the second TVS module outputs BAT power;

[0100] The battery management module is connected to the BAT power supply and outputs BAT3V3 power supply and 12V0 power supply respectively;

[0101] The input end of the emergency power supply circuit is connected to the 3V3 power supply, RF-5V0 power supply and RF3V3 power supply, and the corresponding outputs are 3.3VTTL power supply, -5V power supply and +3.3V power supply. The 3.3VTTL power supply, -5V power supply and +3.3V power supply provide working voltage for the RF transmitting module.

[0102] The input end of the RF 8V power supply circuit is connected to the 8V0 power supply, the output end outputs the RF8V0 power supply, and the enable end is connected to an IO port of the main controller U20;

[0103] The input end of the RF 7V power supply circuit is connected to the 7V0 power supply, the output end outputs the RF7V0 power supply, and the enable end is connected to an IO port of the main controller U7;

[0104] The input end of the emergency power supply circuit is also connected to the RF8V0 power supply and the RF7V0 power supply, and the output end also outputs +8V power supply and +7V power supply correspondingly. The +8V power supply and +7V power supply are used to provide working voltage for the RF transmitting module;

[0105] The beacon machine communication unit includes a beacon machine 422 unit and a first external communication interface. The beacon machine 422 unit communicates with a serial port USART1 of the main controller U20 through a serial port bus. The beacon machine 422 unit is connected to the first external communication interface, and the first external communication interface communicates with a communication module of the host communication unit. The beacon machine 422 unit is powered by a 3V3 power supply.

[0106] The beacon machine 422 unit is composed of a 422 module U18 and its peripheral circuits. The model of the 422 module U18 is MAX3490.

[0107] The first external communication interface is interface JP17, pins 2, 3, 4 and 5 of interface JP17 are connected to the output end of the beacon unit 422, and pins 2 and 3 of the 422 module U18 communicate with a serial port USART1 of the main controller U20 through resistors R120 and R123 respectively;

[0108] In this embodiment, the peripheral circuit of the 422 module U18 also includes a 422 bus circuit, which is composed of an inductor L43, an inductor L47, and TVS tubes DR36 to DR41. The 422 bus output by the 422 bus circuit is connected to the interface JP17, and the circuit network numbers are 422_RX+, 422_RX-, 422_TX- and 422_TX+.

[0109] The beacon unit 422 is mainly responsible for communicating with the host and exchanging instructions or information on whether to enter an emergency state.

[0110] The beacon machine temperature sensor and the beacon machine acceleration sensor are connected to the main controller U20 through the I2C interface and the SPI interface respectively. The beacon machine temperature sensor and the beacon machine acceleration sensor are both powered by a 3V3 power supply;

[0111] The beacon temperature sensor is composed of sensor U21 and its peripheral circuits. The model of sensor U21 is LM75A.

[0112] The beacon machine acceleration sensor is composed of sensor U22 and its peripheral circuits. The model of sensor U22 is LSM6DSV16X.

[0113] The beacon machine power sampling circuit is used to collect the voltage values ​​of 8V0 power supply, 7V0 power supply, BAT power supply, 24V0 power supply, 12V0 power supply and 3V3 power supply respectively, and are connected to the 6 AD interfaces of the main controller U20 respectively;

[0114] The input end of the input isolation circuit is connected to the external emergency switch, and the output end is connected to an IO port of the main controller U20;

[0115] In this embodiment, the input isolation circuit is a switch signal isolation circuit composed of an optical coupler U13 and its peripheral circuits, and its function is to introduce the signal of the external emergency switch into the main controller U20 so that it can determine whether to enter the emergency state;

[0116] The input end of the output isolation circuit is connected to an IO port of the main controller U20, and the output end is connected to and drives an external LED lamp;

[0117] The output isolation circuit is a switch quantity drive isolation circuit composed of an optocoupler U15 and its peripheral circuits. It is used to drive an external LED light to indicate the working status of the beacon.

[0118] The input end of the battery switch circuit is connected to the 12VO power supply and the BAT3V3 power supply, the output end outputs the YOUT backup power supply, and the enable end is connected to an IO port of the main controller U20; the voltage value of the YOUT backup power supply is 24V;

[0119] Both the SD slot and the TF slot are connected to the main controller U20 through the same SPI bus and are powered by a 3V3 power supply.

[0120] The first TVS module is a TVS protection circuit composed of a TVS tube DR14 and a P-channel field effect transistor Q2;

[0121] The first DC power supply module is a 24V-5V voltage stabilizing circuit composed of a DC-DC module U5 and its peripheral circuits. The model of the DC-DC module U5 is SY8113C1ADC;

[0122] The voltage regulator module is a voltage regulator circuit composed of a voltage regulator U9 and its peripheral circuits. The model of the voltage regulator U9 is LT1963AEST-3.3;

[0123] The 3.3V voltage regulator module is a voltage regulator circuit composed of the voltage regulator module U23 and its peripheral circuits.

[0124] The model of the voltage regulator module U23 is LT1963AEST-3.3;

[0125] The enable terminal 5 pin of the voltage regulator module U23 is connected to an IO port (circuit network number is Ctrl3) of the main controller U20 through the resistor R155, so that the main controller U20 controls whether the voltage regulator module U23 outputs a 3.3V voltage (ie, RF3V3 power supply).

[0126] The 8V voltage regulator module is a 24V to 8V DC-DC voltage regulator circuit composed of the voltage regulator module U17 and its peripheral circuits. The model of the voltage regulator module U17 is SY8113C1ADC;

[0127] In this embodiment, the RF 8V power supply enabling circuit is an electronic switching circuit composed of a transistor Q7 and a field effect transistor Q6. An IO port (circuit network number is Ctrl1) of the main controller U20 controls the level of the base of the transistor Q7 to control whether the field effect transistor Q6 is turned on, so that the 8V0 power supply output by the 8V voltage regulator module is loaded onto the emergency power supply circuit.

[0128] The 7V voltage regulator module is a 24V to 7V DC-DC voltage regulator circuit composed of the voltage regulator module U19 and its peripheral circuits. The model of the voltage regulator module U19 is SY8113C1ADC;

[0129] The RF 7V power supply enabling circuit is an electronic switch circuit composed of transistor Q9 and field effect transistor Q8. An IO port (circuit network number is Ctrl2) of the main controller U20 controls the base level of transistor Q9 to control whether the field effect transistor Q8 is turned on, so that the 7V0 power supply output by the 7V voltage regulator module is loaded on the emergency power supply circuit.

[0130] The -5V voltage regulator module is a 24V to -5V DC-DC voltage regulator circuit composed of the voltage regulator module U24 and its peripheral circuits. The model of the voltage regulator module U24 is SY8113C1ADC;

[0131] The 8V voltage regulator module, the 7V voltage regulator module and the -5V voltage regulator module are all used to provide working voltage for the RF transmitting module.

[0132] The battery interface is interface J14, and the second TVS module is a TVS protection circuit composed of TVS tube DR27 and P-channel field effect transistor Q3;

[0133] The battery management module is composed of the battery management chip U8 and its peripheral circuits. The model of the battery management module is LTC4006;

[0134] The emergency power supply circuit includes an interface JP22, a capacitor C127, a capacitor C128, a capacitor C129, a capacitor C130, a capacitor C131, a capacitor C132, a capacitor C133, a capacitor C134, a magnetic bead L51, a magnetic bead L52, a magnetic bead L53, a magnetic bead L54 and a magnetic bead L55;

[0135] One end of the magnetic bead L51 is connected to the RF8V0 power supply, and the other end is connected to the 6th pin of the interface JP22. The capacitor C127 and the capacitor C134 are the filter capacitors at both ends of the magnetic bead L51 respectively.

[0136] One end of the magnetic bead L52 is connected to the RF-5V0 power supply, and the other end is connected to the 6th pin of the interface JP5. The capacitor C128 and the capacitor C133 are the filter capacitors at both ends of the magnetic bead L52 respectively;

[0137] One end of the magnetic bead L53 is connected to the 3V3TTL power supply, and the other end is connected to the 4th pin of the interface JP22; the 3V3TTL power supply is obtained through the 3V3 power supply. In this embodiment, the 3V3TTL power supply can be obtained by filtering the 3V3 power supply through the magnetic bead.

[0138] One end of the magnetic bead L54 is connected to the RF3V3 power supply, and the other end is connected to the 3rd pin of the interface JP22. The capacitor C129 and the capacitor C132 are the filter capacitors at both ends of the magnetic bead L54 respectively.

[0139] One end of the magnetic bead L55 is connected to the RF7V0 power supply, and the other end is connected to the 2nd pin of the interface JP22. The capacitor C130 and the capacitor C131 are the filter capacitors at both ends of the magnetic bead L55 respectively.

[0140] Pin 1 of interface JP22 is connected to the ground wire, pin 2 outputs +7V power supply, pin 3 outputs +3.3V power supply, pin 4 outputs 3.3VTTL power supply, pin 5 outputs -5V power supply, and pin 6 outputs +8V power supply;

[0141] The function of the emergency power supply circuit is to filter through magnetic beads, so that the RF8V0 power supply, RF-5V0 power supply, 3V3TTL power supply, RF7V0 power supply and RF3V3 power supply can supply power to the outside.

[0142] The model of the main controller U20 is STM32F103RBT6 single chip microcomputer. The model of the main controller U2 is also STM32F103RBT6 single chip microcomputer.

[0143] The battery switch circuit includes a diode D13, a resistor R91, a resistor R83, a resistor R88, a resistor R84, a capacitor C74, a field effect transistor Q4, a resistor R89, an optical coupler U14, a diode D14, a resistor R87, a resistor R92, a transistor Q5, a resistor R85, a diode D11, a resistor R90, a capacitor C75 and a resistor R93;

[0144] The cathode of diode D13 is connected to the external emergency signal, the anode of diode D13 is connected to the S pole of field effect tube Q4, pin 1 of optocoupler U14 and ground respectively through resistor R83, resistor R88 and resistor R91, pin 2 of optocoupler U14 is connected to the cathode of diode D14, the anode of diode D14 is connected to ground, pin 4 of optocoupler U14 is connected to BAT3V3 power supply through resistor R89, and pin 3 is connected to ground, pin 4 of optocoupler U14 is also connected to the base of transistor Q5 through resistor R92, the base of transistor Q5 is connected to an IO port of main controller U20 through resistor R93, the connection network number is recorded as BAT_EN, the collector of transistor Q5 is connected to the G pole of field effect tube Q4 through resistor R87, and the emitter is connected to ground, resistor R90 and capacitor C75 are connected in parallel between the base and emitter of transistor Q5;

[0145] The S pole of the field effect tube Q4 is connected to the 12V0 power supply, the D pole is connected to the positive pole of the diode D11, and the negative pole of the diode D11 outputs the YOUT standby power supply;

[0146] The resistor R84 and the capacitor C74 are connected in parallel between the S pole and the G pole of the field effect transistor Q4, and the anode of the diode D11 is connected to the emitter of the transistor Q5 through the resistor R85;

[0147] In this embodiment, the signal of the emergency switch (emergency signal_IN) passes through the diode D13 and is input into the battery switch circuit, and the emergency signal BAT_EN generated by the main controller U20 through the IO port is input into the battery switch circuit through the resistor R93, and the two are in an OR relationship;

[0148] The transistor Q5 and the field effect transistor Q4 form an electronic switch. When the emergency signal BAT_EN or the signal of the emergency switch is effective, the transistor Q5 is turned on, causing the field effect transistor Q4 to be turned on, so that the 12V0 power output by the battery management module can be input to the Schottky diode D11, thereby outputting an emergency 24V0 power supply, which is also input to the input end of the DC-DC module U5, thereby providing an emergency battery power supply;

[0149] In this embodiment, whether the main controller U20 generates the emergency signal BAT_EN is determined by obtaining the data of the acceleration sensor U22 and coordinating with the data of the Beidou terminal. The user can define the conditions for entering the emergency state according to actual needs.

[0150] The beacon power sampling circuit is a resistive voltage sampling circuit;

[0151] In this embodiment, the beacon power sampling circuit includes an 8V0 power sampling circuit, a 7V0 power sampling circuit, a BAT power sampling circuit, a 24V0 power sampling circuit, a 12V0 power sampling circuit and a 3V3 power sampling circuit. These sampling circuits are all resistor voltage sampling circuits. Taking the 24V0 power sampling circuit as an example, after the voltage is divided by resistors R158 and R162, the collected voltage value is input to an AD interface of the main controller U20, and its circuit network number is 24V0_BIT; in this embodiment, a TVS tube DE11 connected in parallel with the resistor R162 is also provided for TVS isolation. The circuit principles of other sampling circuits are the same as the 24V0 power sampling circuit.

[0152] The input isolation circuit and the output isolation circuit are both switch quantity optocoupler isolation circuits.

[0153] In this embodiment, the input end of the input isolation circuit is connected to the external emergency switch through the 8th pin of the interface JP17; the output end of the output isolation circuit is connected to and drives an external LED lamp through the 9th pin of the interface JP17.

[0154] The host includes a host power supply circuit and a host control unit, and the host control unit includes a main controller U2, and a host communication unit, a host temperature sensor, a host acceleration sensor and a host power supply sampling circuit electrically connected to the main controller U2 respectively;

[0155] The input end of the host power supply circuit is connected to the external 24V power supply and YOUT standby power supply, and the output end supplies power to the host control unit;

[0156] The host communication unit includes three communication modules, which are electrically connected and communicate with the external To comprehensive display device, the beacon communication unit and the Beidou terminal respectively;

[0157] The host power sampling circuit is used to collect the voltage generated by the host power circuit.

[0158] The host power supply circuit includes a second power supply interface, an emergency power supply interface, a second TVS module and a second DC power supply module, the second power supply interface is an interface JP1, the 3rd pin of the interface JP1 is connected to an external 24V power supply, the 2nd pin is connected to a ground wire, and the 1st pin of the interface JP1 is also connected to an external start switch;

[0159] The emergency power interface is interface JP9, and pin 1 of interface JP9 is connected to the YOUT backup power supply, and pin 2 is connected to the ground wire;

[0160] The second TVS module is a TVS protection circuit composed of a TVS tube DR1 and a P-channel field effect transistor IC1;

[0161] The second DC power supply module is a 24V-3.3V voltage stabilizing circuit composed of a DC-DC module IC1 and its peripheral circuits. The DC-DC module IC1 outputs a Z3V3 power supply. The model of the DC-DC module IC1 is SY8113C1ADC.

[0162] The host communication unit includes communication module A, communication module B and communication module C, communication module A includes external communication interface A and host 422 unit A, and external communication interface A is interface JP11;

[0163] The circuit principles of communication module A, communication module B and communication module C are the same as the circuit principles of the beacon communication unit, all of which are 422 communications.

[0164] The host 422 unit A is composed of the 422 module U1 and its peripheral circuits. The 4th, 5th, 6th and 7th pins of the interface JP11 are connected to the output end of the host 422 unit A. The host 422 unit A is responsible for communicating with the external To comprehensive display device.

[0165] The host 422 unit B is composed of the 422 module U3 and its peripheral circuits. Pins 1, 2, 3 and 4 of the interface JP12 are connected to the output end of the host 422 unit B. The host 422 unit B is responsible for communicating with the Beidou terminal.

[0166] The host 422 unit C is composed of the 422 module U6 and its peripheral circuits. Pins 1, 2, 3 and 4 of interface JP7 are all connected to the output end of the host 422 unit C; interface JP7 is connected to interface JP17, and the host 422 unit C is responsible for communicating with the beacon machine 422 unit; pin 7 of interface JP7 is also connected to an external LED light, and pin 6 is also connected to an external emergency switch;

[0167] The host temperature sensor is composed of sensor U10 and its peripheral circuits. The model of sensor U10 is LM75A.

[0168] The host acceleration sensor is composed of sensor U11 and its peripheral circuits. The model of sensor U11 is LSM6DSV16X.

[0169] The main controller U2, host communication unit, host temperature sensor and host acceleration sensor are all powered by the Z3V3 power supply;

[0170] The host power sampling circuit is responsible for collecting the voltage of pin 3 of interface JP1 and the voltage of Z3V3 power supply; the host power sampling circuit is a resistive voltage acquisition circuit. In this embodiment, the host power sampling circuit includes a 24V sampling circuit and a Z3V3 power sampling circuit. Both circuits are voltage sampling circuits. Taking the 24V sampling circuit as an example, it is composed of resistor R75, resistor R77 and TVS tube DE1, which are used to collect the 24V voltage of pin 3 of interface JP1 (circuit network number is 24V0IN), and output the sampled value to an AD interface of the main controller U2, and the network number is recorded as 24V0_BIT; the Z3V3 power sampling circuit is to another AD interface of the main controller U2, and the network number is recorded as 3V3_BIT.

[0171] The host is mainly responsible for processing data from the Beidou terminal and beacon, interconnecting data with the airborne platform system and other equipment, and controlling the power indicator light and emergency status indicator light at the same time.

[0172] When receiving the message command from the beacon machine to enter the emergency mode, a control command will be sent to turn on the emergency status indicator light.

[0173] In this embodiment, the host can communicate with similar airborne platforms or control centers on a global scale through short messages via the Beidou terminal, and can also assist in navigation through positioning.

[0174] The beacon has manual emergency working mode and automatic emergency working mode. In manual emergency, the emergency working mode is entered by turning on the external emergency switch; in automatic emergency, the acceleration data is monitored in real time through the acceleration chip in the beacon, and the emergency working mode is automatically entered when the acceleration exceeds a certain threshold.

[0175] The Beidou beacon system for an airborne platform described in the present invention solves the technical problems of global short message reception and transmission, emergency positioning and beacon emission of the Beidou beacon system; the present invention realizes short message communication and positioning functions within a global range, and can ensure smooth communication even in complex environments, and has automatic emergency mode and manual emergency mode. The acceleration sensor monitors in real time, and automatically triggers an emergency signal when abnormal acceleration exceeding a set threshold is detected, thereby improving the accident response speed; personnel are allowed to manually activate a distress signal in an emergency, thereby improving the flexibility and reliability of the system; distress signals are directly transmitted to surrounding platforms and search and rescue equipment, and the system has the functions of a traditional emergency positioning device, thereby enhancing the reliability of rescue; in an emergency state, the beacon will record the data of the acceleration sensor into a TF card, which is helpful for analyzing the cause of the accident afterwards and optimizing the safety of the equipment; the host system can automatically control the battery power supply in a non-emergency state, thereby reducing energy consumption and extending the service life of the equipment.

Claims

1. A Beidou beacon system for an airborne platform, characterized in that: It includes a beacon machine, a host and a Beidou terminal. The beacon machine and the Beidou terminal communicate with the host through two 422 buses respectively; The beacon includes a radio frequency transmission module, a beacon antenna, a lithium battery pack, a beacon power supply circuit and a beacon control unit. The beacon control unit includes a main controller U20, and a radio frequency 8V power supply enabling circuit, a radio frequency 7V power supply enabling circuit, a beacon communication unit, a beacon temperature sensor, a beacon power supply sampling circuit, a beacon acceleration sensor, an input isolation circuit, an output isolation circuit, a battery switch circuit, an SD card slot and a TF slot, which are electrically connected to the main controller U20 respectively; The input end of the beacon machine power supply circuit is connected to an external 24V power supply and a lithium battery pack respectively, and the output end is used to power the beacon machine control unit and the radio frequency transmission module, and the radio frequency transmission module is connected to the beacon antenna; The output end of the beacon power supply circuit also outputs YOUT backup power supply; The beacon machine power supply sampling circuit is used to collect the voltage generated by the beacon machine power supply circuit; The host includes a host power supply circuit and a host control unit, and the host control unit includes a main controller U2, and a host communication unit, a host temperature sensor, a host acceleration sensor and a host power supply sampling circuit electrically connected to the main controller U2 respectively; The input end of the host power supply circuit is connected to the external 24V power supply and YOUT standby power supply, and the output end supplies power to the host control unit; The host communication unit includes three communication modules, which are electrically connected and communicate with the external To comprehensive display device, the beacon communication unit and the Beidou terminal respectively; The host power sampling circuit is used to collect the voltage generated by the host power circuit.

2. A Beidou beacon system for an airborne platform as claimed in claim 1, characterized in that: The beacon power supply circuit includes a first power supply interface, a first TVS module, a first DC power supply module, a voltage stabilizing module, a 3.3V voltage stabilizing module, an 8V voltage stabilizing module, a 7V voltage stabilizing module, a -5V voltage stabilizing module, a battery interface, a second TVS module, a battery management module and an emergency power supply circuit; The first power interface is used to connect an external 24V power supply, the first power interface is connected to a first TVS module, and the first TVS module outputs a 24V0 power supply; The first DC power module, 8V voltage stabilizing module, 7V voltage stabilizing module and -5V voltage stabilizing module are all connected to the 24V0 power supply, and the first DC power module, 8V voltage stabilizing module, 7V voltage stabilizing module and -5V voltage stabilizing module output 5V0 power, 8V0 power, 7V0 power and RF-5V0 power respectively; The voltage regulator module and the 3.3V voltage regulator module are both connected to the 5V0 power supply, and the voltage regulator module and the 3.3V voltage regulator module output 3V3 power supply and RF3V3 power supply respectively; The enable terminal of the 3.3V voltage regulator module is connected to an IO port of the main controller U20; The battery interface is used to connect the lithium battery pack, the battery interface is connected to the second TVS module, and the second TVS module outputs BAT power; The battery management module is connected to the BAT power supply and outputs BAT3V3 power supply and 12V0 power supply respectively; The input end of the emergency power supply circuit is connected to the 3V3 power supply, RF-5V0 power supply and RF3V3 power supply, and the corresponding outputs are 3.3VTTL power supply, -5V power supply and +3.3V power supply. The 3.3VTTL power supply, -5V power supply and +3.3V power supply provide working voltage for the RF transmitting module.

3. A Beidou beacon system for an airborne platform as claimed in claim 2, characterized in that: The input end of the RF 8V power supply circuit is connected to the 8V0 power supply, the output end outputs the RF8V0 power supply, and the enable end is connected to an IO port of the main controller U20; The input end of the RF 7V power supply circuit is connected to the 7V0 power supply, the output end outputs the RF7V0 power supply, and the enable end is connected to an IO port of the main controller U7; The input end of the emergency power supply circuit is also connected to the RF8V0 power supply and the RF7V0 power supply, and the output end also outputs +8V power supply and +7V power supply correspondingly. The +8V power supply and +7V power supply are used to provide working voltage for the RF transmitting module; The beacon machine communication unit includes a beacon machine 422 unit and a first external communication interface. The beacon machine 422 unit communicates with a serial port USART1 of the main controller U20 through a serial port bus. The beacon machine 422 unit is connected to the first external communication interface, and the first external communication interface communicates with a communication module of the host communication unit. The beacon machine 422 unit is powered by a 3V3 power supply. The beacon machine 422 unit is composed of a 422 module U18 and its peripheral circuits. The model of the 422 module U18 is MAX3490. The first external communication interface is interface JP17, pins 2, 3, 4 and 5 of interface JP17 are connected to the output end of the beacon unit 422, and pins 2 and 3 of the 422 module U18 communicate with a serial port USART1 of the main controller U20 through resistors R120 and R123 respectively; The beacon machine temperature sensor and the beacon machine acceleration sensor are connected to the main controller U20 through the I2C interface and the SPI interface respectively. The beacon machine temperature sensor and the beacon machine acceleration sensor are both powered by a 3V3 power supply; The beacon temperature sensor is composed of sensor U21 and its peripheral circuits. The model of sensor U21 is LM75A. The beacon machine acceleration sensor is composed of sensor U22 and its peripheral circuits. The model of sensor U22 is LSM6DSV16X. The beacon machine power sampling circuit is used to collect the voltage values ​​of 8V0 power supply, 7V0 power supply, BAT power supply, 24V0 power supply, 12V0 power supply and 3V3 power supply respectively, and are connected to the 6 AD interfaces of the main controller U20 respectively; The input end of the input isolation circuit is connected to the external emergency switch, and the output end is connected to an IO port of the main controller U20; The input end of the output isolation circuit is connected to an IO port of the main controller U20, and the output end is connected to and drives an external LED lamp; The input end of the battery switch circuit is connected to the 12VO power supply and the BAT3V3 power supply, the output end outputs the YOUT backup power supply, and the enable end is connected to an IO port of the main controller U20; the voltage value of the YOUT backup power supply is 24V; Both the SD slot and the TF slot are connected to the main controller U20 through the same SPI bus and are powered by a 3V3 power supply.

4. A Beidou beacon system for an airborne platform as claimed in claim 3, characterized in that: The first TVS module is a TVS protection circuit composed of a TVS tube DR14 and a P-channel field effect transistor Q2; The first DC power supply module is a 24V-5V voltage stabilizing circuit composed of a DC-DC module U5 and its peripheral circuits. The model of the DC-DC module U5 is SY8113C1ADC; The voltage regulator module is a voltage regulator circuit composed of a voltage regulator U9 and its peripheral circuits. The model of the voltage regulator U9 is LT1963AEST-3.3; The 3.3V voltage regulator module is a voltage regulator circuit composed of the voltage regulator module U23 and its peripheral circuits. The model of the voltage regulator module U23 is LT1963AEST-3.3; The 8V voltage regulator module is a 24V to 8V DC-DC voltage regulator circuit composed of the voltage regulator module U17 and its peripheral circuits. The model of the voltage regulator module U17 is SY8113C1ADC; The 7V voltage regulator module is a 24V to 7V DC-DC voltage regulator circuit composed of the voltage regulator module U19 and its peripheral circuits. The model of the voltage regulator module U19 is SY8113C1ADC; The -5V voltage regulator module is a 24V to -5V DC-DC voltage regulator circuit composed of the voltage regulator module U24 and its peripheral circuits. The model of the voltage regulator module U24 is SY8113C1ADC; The battery interface is interface J14, and the second TVS module is a TVS protection circuit composed of TVS tube DR27 and P-channel field effect transistor Q3; The battery management module is composed of the battery management chip U8 and its peripheral circuits. The model of the battery management module is LTC4006; The emergency power supply circuit includes an interface JP22, a capacitor C127, a capacitor C128, a capacitor C129, a capacitor C130, a capacitor C131, a capacitor C132, a capacitor C133, a capacitor C134, a magnetic bead L51, a magnetic bead L52, a magnetic bead L53, a magnetic bead L54 and a magnetic bead L55; One end of the magnetic bead L51 is connected to the RF8V0 power supply, and the other end is connected to the 6th pin of the interface JP22. The capacitor C127 and the capacitor C134 are the filter capacitors at both ends of the magnetic bead L51 respectively. One end of the magnetic bead L52 is connected to the RF-5V0 power supply, and the other end is connected to the 6th pin of the interface JP5. The capacitor C128 and the capacitor C133 are the filter capacitors at both ends of the magnetic bead L52 respectively; One end of the magnetic bead L53 is connected to the 3V3TTL power supply, and the other end is connected to the 4th pin of the interface JP22; the 3V3TTL power supply is obtained through the 3V3 power supply; One end of the magnetic bead L54 is connected to the RF3V3 power supply, and the other end is connected to the 3rd pin of the interface JP22. The capacitor C129 and the capacitor C132 are the filter capacitors at both ends of the magnetic bead L54 respectively. One end of the magnetic bead L55 is connected to the RF7V0 power supply, and the other end is connected to the 2nd pin of the interface JP22. The capacitor C130 and the capacitor C131 are the filter capacitors at both ends of the magnetic bead L55 respectively. Pin 1 of interface JP22 is connected to the ground wire, pin 2 outputs +7V power supply, pin 3 outputs +3.3V power supply, pin 4 outputs 3.3VTTL power supply, pin 5 outputs -5V power supply, and pin 6 outputs +8V power supply; The model of the main controller U20 is STM32F103RBT6 microcontroller.

5. A Beidou beacon system for an airborne platform as claimed in claim 4, characterized in that: The battery switch circuit includes a diode D13, a resistor R91, a resistor R83, a resistor R88, a resistor R84, a capacitor C74, a field effect transistor Q4, a resistor R89, an optical coupler U14, a diode D14, a resistor R87, a resistor R92, a transistor Q5, a resistor R85, a diode D11, a resistor R90, a capacitor C75 and a resistor R93; The cathode of diode D13 is connected to the external emergency signal, the anode of diode D13 is connected to the S pole of field effect tube Q4, pin 1 of optocoupler U14 and ground respectively through resistor R83, resistor R88 and resistor R91, pin 2 of optocoupler U14 is connected to the cathode of diode D14, the anode of diode D14 is connected to ground, pin 4 of optocoupler U14 is connected to BAT3V3 power supply through resistor R89, and pin 3 is connected to ground, pin 4 of optocoupler U14 is also connected to the base of transistor Q5 through resistor R92, the base of transistor Q5 is connected to an IO port of main controller U20 through resistor R93, the connection network number is recorded as BAT_EN, the collector of transistor Q5 is connected to the G pole of field effect tube Q4 through resistor R87, and the emitter is connected to ground, resistor R90 and capacitor C75 are connected in parallel between the base and emitter of transistor Q5; The S pole of the field effect tube Q4 is connected to the 12V0 power supply, the D pole is connected to the positive pole of the diode D11, and the negative pole of the diode D11 outputs the YOUT standby power supply; The resistor R84 and the capacitor C74 are connected in parallel between the S pole and the G pole of the field effect transistor Q4, and the anode of the diode D11 is connected to the emitter of the transistor Q5 through the resistor R85; The beacon power sampling circuit is a resistive voltage sampling circuit; The input isolation circuit and the output isolation circuit are both switch quantity optocoupler isolation circuits.

6. A Beidou beacon system for an airborne platform as claimed in claim 1, characterized in that: The host power supply circuit includes a second power supply interface, an emergency power supply interface, a second TVS module and a second DC power supply module, the second power supply interface is an interface JP1, the 3rd pin of the interface JP1 is connected to an external 24V power supply, the 2nd pin is connected to a ground wire, and the 1st pin of the interface JP1 is also connected to an external start switch; The emergency power interface is interface JP9, and pin 1 of interface JP9 is connected to the YOUT backup power supply, and pin 2 is connected to the ground wire; The second TVS module is a TVS protection circuit composed of a TVS tube DR1 and a P-channel field effect transistor IC1; The second DC power supply module is a 24V-3.3V voltage stabilizing circuit composed of a DC-DC module IC1 and its peripheral circuits. The DC-DC module IC1 outputs a Z3V3 power supply. The model of the DC-DC module IC1 is SY8113C1ADC.

7. A Beidou beacon system for an airborne platform as claimed in claim 6, characterized in that: The host communication unit includes communication module A, communication module B and communication module C, communication module A includes external communication interface A and host 422 unit A, and external communication interface A is interface JP11; The host 422 unit A is composed of the 422 module U1 and its peripheral circuits. The 4th, 5th, 6th and 7th pins of the interface JP11 are connected to the output end of the host 422 unit A. The host 422 unit A is responsible for communicating with the external To comprehensive display device. The host 422 unit B is composed of the 422 module U3 and its peripheral circuits. Pins 1, 2, 3 and 4 of the interface JP12 are connected to the output end of the host 422 unit B. The host 422 unit B is responsible for communicating with the Beidou terminal. The host 422 unit C is composed of the 422 module U6 and its peripheral circuits. Pins 1, 2, 3 and 4 of interface JP7 are all connected to the output end of the host 422 unit C; interface JP7 is connected to interface JP17, and the host 422 unit C is responsible for communicating with the beacon machine 422 unit; pin 7 of interface JP7 is also connected to an external LED light, and pin 6 is also connected to an external emergency switch; The host temperature sensor is composed of sensor U10 and its peripheral circuits. The model of sensor U10 is LM75A. The host acceleration sensor is composed of sensor U11 and its peripheral circuits. The model of sensor U11 is LSM6DSV16X. The main controller U2, host communication unit, host temperature sensor and host acceleration sensor are all powered by the Z3V3 power supply; The host power sampling circuit is responsible for collecting the voltage of pin 3 of interface JP1 and the voltage of Z3V3 power supply; the host power sampling circuit is a resistive voltage collection circuit.

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