Mooring unmanned aerial vehicle RF optical fiber forwarding system without depending on launching tower

Abstract

The invention belongs to the technical field of test launch control, and relates to a mooring unmanned aerial vehicle RF optical fiber forwarding system without relying on a launching tower. The six-rotor unmanned aerial vehicle mooring system comprises a front-end RF optical fiber conversion unit, an airborne power supply conversion module, a six-rotor unmanned aerial vehicle platform, a mooring power supply signal transmission cable, a mooring control box, a rear-end RF optical fiber conversion unit and a power supply oil engine. According to the system, a front-end RF optical fiber conversion unit is mounted on a six-rotor unmanned aerial vehicle to approach a rocket launching platform, measurement and control and data transmission signals of a spacecraft are transmitted and received, and bidirectional signal forwarding between onboard load signals and a ground mooring control box is completed through a mooring power supply signal transmission cable; and signal transmission with the rear-end RF optical fiber conversion unit is completed through the signal transmission optical fiber, so that bidirectional communication of link signals between the front-end launching station and the rear-end satellite test equipment is ensured, and stable transmission of test signals before rocket launching without relying on a launching tower is realized.

Description

Technical Field

[0001] The present invention belongs to the field of measurement, transmission and control technology, and relates to a tethered UAV RF optical fiber forwarding system without relying on a transmitting tower. Background Art

[0002] Space launches have adopted a rapid launch model, primarily based on towerless and simple cradle launch scenarios. Currently, many commercial space launches are towerless. Many low-orbit satellites in the private sector are relatively small and undergo pre-shipment testing, eliminating the need for testing at launch. Many large spacecraft still require testing at launch, creating challenges in relaying measurement, control, and data transmission signals between the launch station and the ground.

[0003] The Chinese invention patent "A Signal Forwarding System for Multiple Devices on a Single Rocket," published as CN117155479A, proposes a signal forwarding system that can forward measurement, control, and digital transmission signals between the launch station and the ground end. However, the transmitting antenna, receiving antenna, and front-end and back-end relay forwarding equipment in this invention all rely on the launch tower and test building at the station to provide deployment space. In the rapid launch mode of the rocket, these installation conditions are no longer available, and the existing forwarding system is unable to meet the signal forwarding requirements. If the traditional drone-mounted forwarding device is used for signal forwarding, on the one hand, it is difficult to meet the actual long-term testing requirements due to the limited working time of the drone itself. On the other hand, the existing forwarding equipment is all cabinet-type modules, and the size and weight do not meet the mounting requirements. Therefore, there is an urgent need to find a new forwarding system to solve the problem of stable and reliable forwarding between the launch station spacecraft signal and the back-end ground satellite equipment without relying on the launch tower. Summary of the Invention

[0004] The technical problem solved by the present invention is: to overcome the shortcomings of the existing technology, the present invention proposes a tethered drone RF fiber optic forwarding system without relying on a transmission tower.

[0005] The technical solution of the present invention is: a tethered UAV RF fiber optic forwarding system without relying on a transmission tower, comprising a front-end RF fiber optic conversion unit, an airborne power conversion module, a tethered power supply signal transmission cable, a six-rotor UAV platform, a tethered control box, a rear-end RF fiber optic conversion unit, and a power generator; the front-end RF fiber optic conversion unit and the airborne power conversion module are mounted on the six-rotor UAV platform; the power generator and the tethered control box are deployed on the ground; the rear-end RF fiber optic conversion unit is deployed in a rear-end test plant; the tethered power supply signal transmission cable has one end on the ground connected to the tethered control box and one end on the aircraft connected to the front-end RF fiber optic conversion unit and the airborne power conversion module respectively;

[0006] The front-end RF fiber conversion unit receives the downlink RF signal from the spacecraft, converts it into a downlink optical signal after signal processing, and transmits it to the tethered control box. At the same time, it receives the uplink optical signal transmitted by the tethered control box, restores it into an uplink RF signal, and then radiates it to the onboard equipment of the spacecraft through air-feed.

[0007] The onboard power conversion module receives AC power from the tethered control box and converts it into DC power to power the front-end RF fiber optic conversion unit;

[0008] The back-end RF fiber optic conversion unit receives the downlink optical signal output by the tethered control box, converts it into a downlink RF signal after signal processing and transmits it to the ground-based back-end satellite signal processing equipment; at the same time, it receives the uplink RF signal transmitted by the ground-based back-end satellite signal processing equipment, converts it into an uplink optical signal and transmits it to the tethered control box;

[0009] The power generator is connected to the moored control box to provide power for it.

[0010] Furthermore, the front-end RF fiber conversion unit includes a transceiver antenna module, a transceiver shared conversion module, a front-end amplification module, a front-end microwave amplification and filtering module, an electro-optical modulation conversion module, and a front-end microwave and optical signal monitoring module;

[0011] The transceiver antenna module receives the downlink radio frequency signal radiated by the onboard equipment of the spacecraft and transmits it to the transceiver shared conversion module; the transceiver antenna module also receives the uplink radio frequency signal transmitted by the transceiver shared conversion module and radiates it to the onboard equipment of the spacecraft;

[0012] The transceiver shared conversion module receives the downlink RF signal and transmits it to the front-end amplification module after signal attenuation control, multi-stage unidirectional isolation, and switching control. At the same time, it receives the uplink RF signal transmitted by the front-end amplification module and transmits it to the transceiver antenna module after multi-stage unidirectional isolation, switching control, and signal attenuation control.

[0013] The front-end amplifier module receives the downlink RF signal, amplifies it, and transmits it to the front-end microwave amplifier and filter module after signal processing. At the same time, it receives the uplink RF signal transmitted by the front-end microwave amplifier and filter module, amplifies it, and transmits it to the transmit-receive shared conversion module.

[0014] The front-end microwave amplification and filtering module receives the downlink RF signal, transmits it to the electro-optical modulation and conversion module after amplification, filtering and conditioning; at the same time, the uplink RF signal transmitted by the electro-optical modulation and conversion module is received, amplified, filtered and conditioned, and then transmitted to the front-end amplifier module;

[0015] The electro-optical modulation and conversion module receives the downlink RF signal, converts it into a downlink optical signal through electro-optical conversion, and transmits it to the ground tethered control box via the tethered power supply signal transmission cable. At the same time, it receives the uplink optical signal transmitted by the tethered power supply signal transmission cable, and transmits it to the front-end microwave amplification and filtering module after optical-electrical conversion.

[0016] The front-end microwave and optical signal monitoring module is used to complete the monitoring and processing of each unit of the transceiver shared conversion module, front-end amplification module, front-end microwave amplification and filtering module, and electro-optical modulation conversion module.

[0017] Furthermore, the transmit-receive shared conversion module includes a programmable attenuator, a circulator, an uplink transmit link, and a downlink receive link; the programmable attenuator is used to condition the uplink and downlink radio frequency signals; the circulator is used to simultaneously transmit the uplink and downlink radio frequency signals in both directions; the uplink transmit link performs unidirectional isolation, shunting, switching control, and signal power amplification on the uplink radio frequency signal; the downlink receive link performs unidirectional isolation, switching control, signal low-noise amplification, and shunting on the downlink radio frequency signal.

[0018] Furthermore, the uplink transmission link includes an uplink secondary unidirectional isolator, an uplink signal splitter, an uplink switching switch, an uplink power amplifier, and an uplink primary unidirectional isolator; the uplink secondary unidirectional isolator is used to isolate the transceiver link; the uplink signal splitter diverts the uplink RF signal to a bypass for uplink RF signal pattern detection and real-time monitoring; the uplink switching switch cooperates with the switching of the uplink transmission link according to the signal system; the uplink power amplifier completes power amplification of weak signals; and the uplink primary unidirectional isolator is used to isolate the transceiver link.

[0019] Furthermore, the downlink receiving link includes a downlink first-level unidirectional isolator, a downlink switching switch, a downlink low-noise amplifier, a downlink signal splitter, and a downlink second-level unidirectional isolator; the downlink first-level unidirectional isolator is used to isolate the transceiver link; the downlink switching switch cooperates with the switching work according to the signal system; the downlink low-noise amplifier is used for signal low-noise processing; the downlink signal splitter diverts the signal to a bypass for signal pattern detection and real-time monitoring; the downlink second-level unidirectional isolator is used for transceiver isolation.

[0020] Furthermore, the tethered power supply signal transmission cable includes a tethered power supply cable transmission conductor and a tethered signal transmission optical fiber; the tethered power supply cable transmission conductor is made of alloy aluminum material and is used to transmit power, and the tethered signal transmission optical fiber is used to transmit uplink and downlink optical signals.

[0021] Furthermore, the mooring control box includes an automatic optical fiber retractable cable box, a power conversion control module, a switch control module, and a signal transmission optical fiber; the automatic optical fiber retractable cable box completes the sending and receiving management of the mooring power supply signal transmission cable, and automatically realizes automatic operation in unmanned mode based on online tension recognition;

[0022] The power conversion control module completes the power processing and conversion of the oil generator; the switch control module completes the power supply and startup of the tethered control box, and is accompanied by real-time detection functions; the signal transmission optical fiber is used to connect the tethered control box and the back-end RF optical fiber conversion unit to bidirectionally forward the upstream and downstream optical signals.

[0023] Furthermore, the signal transmission optical fiber is laid in a movable manner by a tethered control box, and the length is greater than 1 km.

[0024] Furthermore, the back-end RF fiber conversion unit includes a photoelectric converter module, a back-end microwave amplification and filtering circuit, a branch test module, and a back-end microwave and optical signal monitoring module;

[0025] The photoelectric converter module receives the downlink optical signal transmitted by the tethered control box, and transmits the downlink radio frequency signal to the back-end microwave amplification and filtering circuit after photoelectric conversion. At the same time, it receives the uplink radio frequency signal transmitted by the back-end microwave amplification and filtering circuit, and transmits the uplink optical signal to the front-end tethered control box after electro-optical conversion.

[0026] The back-end microwave amplification and filtering circuit receives the downlink RF signal, performs narrowband filtering, in-band flatness, and stable gain processing, and outputs it to the shunt test module. At the same time, it receives the uplink RF signal transmitted by the shunt test module, performs narrowband filtering, in-band flatness, and stable gain processing, and outputs it to the photoelectric converter module.

[0027] Branch test module, completes real-time adjustment indication quality monitoring of uplink and downlink RF signals;

[0028] The back-end microwave and optical signal monitoring module completes parameter index and status monitoring of the photoelectric converter module, microwave amplification and filtering circuit.

[0029] Furthermore, the six-rotor UAV platform has an installation cross-section that can adapt to the size and weight of the front-end RF fiber optic conversion unit and the airborne power conversion module, and by controlling the six-rotor UAV platform, the main beam of the transceiver antenna module can be accurately aligned with the rocket's wave transmission port.

[0030] The beneficial effects of the present invention compared with the prior art are:

[0031] (1) The present invention proposes a tethered UAV RF fiber optic forwarding system that does not rely on a launch tower. The equipment deployment is flexible and is not affected by the direction of the rocket's wave transmission port. It can face the wave transmission port in any direction in real time, meeting the signal detection and reliable transmission requirements under various launch states.

[0032] (2) The present invention adopts a tethered UAV platform for payload carrying, which can adapt to a long-term signal testing process. At the same time, the signal received by the system is also transmitted through the tethered optical fiber, avoiding electromagnetic pollution and signal power loss caused by space radiation, which is beneficial to ensure the integrity and stability of the signal.

[0033] (3) The present invention proposes a miniaturized RF fiber optic forwarding front-end and a shared design for the transceiver module, which greatly reduces the module size and weight. Compared with the cabinet-type module, the size is reduced to 1 / 3 of the original and the weight is reduced to 1 / 2, meeting the installation requirements of the UAV platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A block diagram of the system composition provided by the present invention;

[0035] Figure 2 This is a principle block diagram of the transmitting and receiving shared conversion module of the present invention;

[0036] Figure 3 A schematic diagram of the system provided by the present invention;

[0037] Figure 4 This is a diagram of the drone test scene provided by the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further explained and illustrated below with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1 As shown, a tethered UAV RF fiber optic forwarding system without relying on a transmission tower includes a front-end RF fiber optic conversion unit, an airborne power conversion module, a tethered power signal transmission cable, a six-rotor UAV platform, a tethered control box, a back-end RF fiber optic conversion unit, and a power generator.

[0040] The front-end RF fiber optic conversion unit and the airborne power conversion module are both mounted on the six-rotor UAV platform. The airborne power conversion module provides DC power for the front-end RF fiber optic conversion unit. The power generator and the tethered control box are deployed on the ground to provide them with power. The back-end RF fiber optic conversion unit is deployed in the back-end test plant and is connected to the front-end RF fiber optic conversion unit through signal transmission optical fiber and tethered signal transmission optical fiber.

[0041] The tethered UAV RF fiber optic forwarding system mainly completes the uplink and downlink signal forwarding between the front-end spacecraft onboard equipment and the back-end ground satellite signal processing equipment. The downlink signal includes the measurement and control downlink signal and the digital transmission signal; the uplink signal is the measurement and control uplink signal.

[0042] Downlink signal forwarding process: The front-end RF fiber optic conversion unit receives the spacecraft downlink RF signal and converts it into a downlink optical signal output, which is then output to the back-end RF fiber optic conversion unit through the tethered signal transmission fiber and the signal transmission fiber. The back-end RF fiber optic conversion unit restores the downlink optical signal to the spacecraft downlink RF signal and transmits it to the ground satellite signal processing equipment through the RF cable. The uplink signal process is opposite to the downlink signal test forwarding direction.

[0043] like Figure 2 As shown, a tethered UAV RF fiber optic forwarding system without relying on a transmission tower includes a front-end RF fiber optic conversion unit, an airborne power conversion module, a tethered power signal transmission cable, a six-rotor UAV platform, a tethered control box, a back-end RF fiber optic conversion unit, and a power generator.

[0044] The front-end RF fiber conversion unit receives downlink RF signals from the spacecraft and converts them into downlink optical signals for transmission to the ground through link conditioning. It also receives uplink optical signals from the ground and converts them into uplink RF signals for air-feed radiation to the onboard equipment of the spacecraft.

[0045] The tethered power supply signal transmission cable is a composite power and signal cable that serves as a medium for power supply and optical signal transmission for the hexacopter platform and payload. It consists of a tethered power supply cable transmission conductor and a tethered signal transmission optical fiber. The tethered power supply cable transmission conductor is made of alloy aluminum.

[0046] The onboard power conversion module provides power conversion for the front-end RF fiber optic conversion unit. The power input comes from the AC220V in the ground tethered control box. The onboard power conversion module converts AC220V into DC12V for use by the front-end RF fiber optic conversion unit.

[0047] The six-rotor UAV platform is used to carry the front-end RF fiber optic conversion unit and the airborne power conversion module. The six-rotor flight platform is more stable, has strong anti-disturbance capabilities, mature technology, and relatively stable flight control and signal;

[0048] The tethered control box has an internal switch that controls the on and off of high-voltage power transmission. It also serves as a storage box for the tethered power signal transmission cable, automatically recovering and releasing it. It also has an FC / APC interface, which transmits signals to and from the back-end RF forwarding unit via the signal transmission fiber. The signal transmission fiber, as a key connection medium between the front-end and back-end signals, is usually laid in advance. If there is no fiber laying in the area, the tethered control box can be used to lay mobile fiber cables with a length of more than 1 km.

[0049] The power generator is the power source for the entire system and can support 8 hours of continuous operation to meet the continuous power supply requirements of testing and transmission;

[0050] The back-end RF fiber optic conversion unit is placed together with the satellite ground terminal in the back-end technical workshop area. It mainly receives the downlink optical signal transmitted by the front-end and restores it into a downlink RF signal for transmission to the ground satellite signal processing equipment. At the same time, it receives the uplink RF signal transmitted by the ground satellite signal processing equipment, converts it into an uplink optical signal and transmits it to the front-end.

[0051] Furthermore, the front-end RF fiber conversion unit includes a transceiver antenna module, a transceiver shared conversion module, a front-end amplifier module, a front-end microwave amplification and filtering module, an electro-optical modulation conversion module, and a front-end microwave and optical signal monitoring module. Taking downlink signal transmission as an example, the transceiver antenna module receives the downlink RF signal from the spacecraft and outputs it to the front-end amplifier module. After amplification, the signal is transmitted to the front-end microwave amplification and filtering module for further signal conditioning. The signal is then transmitted to the electro-optical modulation conversion module, which converts it into a downlink optical signal. The signal is then transmitted to the ground via the tethered power supply signal transmission optical fiber. The uplink signal and the downlink signal have the same transmission and processing procedures, but are transmitted in opposite directions.

[0052] The transceiver antenna module completes the detection, reception, and transmission of uplink and downlink radio frequency signals and can adapt to signals of different frequency bands to cover the spacecraft operating frequency band;

[0053] like Figure 3 As shown, the transceiver-shared conversion module includes a programmable attenuator, a circulator, an uplink transmission link, and a downlink reception link. The programmable attenuator is used to condition strong signals; the circulator ensures that the transmission and reception signals can be carried out simultaneously, ensuring full-duplex operation of the signal; the uplink transmission link consists of an uplink secondary unidirectional isolator, an uplink signal splitter, an uplink switching switch, an uplink PA (power amplifier), and an uplink primary unidirectional isolator; the downlink transmission link consists of a downlink primary unidirectional isolator, a downlink switching switch, a downlink LNA (lower noise amplifier), a downlink signal splitter, and a downlink secondary unidirectional isolator.

[0054] Taking downlink signal transmission as an example, the functions of each module are explained. The downlink primary unidirectional isolator isolates the transmit and receive links; the downlink LNA (lower noise amplifier) ​​processes large signals with low noise, preventing overly strong signals from damaging the receive channel; the downlink switch coordinates switching based on the signal structure; the downlink signal splitter diverts the downlink signal to a bypass path for downlink signal pattern detection, enabling real-time monitoring of the link signal; and the downlink secondary unidirectional isolator ensures enhanced transmit and receive isolation and prevents self-interference.

[0055] The front-end amplification module is used to ensure the reception and processing of small test signals, so that the system can work normally when the signal is weak;

[0056] The front-end microwave amplification and filtering module is used to process the system's uplink and downlink to ensure that parameters such as amplification factor, noise figure, and insertion loss can meet the requirements of back-end modulation and demodulation.

[0057] The electro-optical modulation and conversion module completes the electro-optical conversion and photoelectric conversion of the signal; it includes the downlink electro-optical modulation and conversion module and the uplink electro-optical modulation and conversion module; the downlink electro-optical modulation and conversion module completes the conversion of the downlink RF signal of the front-end spacecraft into a downlink optical signal; the uplink electro-optical modulation and conversion module completes the conversion of the uplink optical signal transmitted from the back end into an uplink RF signal.

[0058] The front-end microwave and optical signal monitoring module is used to complete the monitoring and processing of each unit of the transceiver shared conversion module, front-end amplification module, front-end microwave amplification and filtering module, and electro-optical modulation conversion module.

[0059] Furthermore, the back-end RF fiber conversion unit includes an optoelectronic converter module, a back-end microwave amplification and filtering circuit, a branch test module, and a back-end microwave and optical signal monitoring module. Taking downlink signal transmission as an example, the optoelectronic converter module receives the downlink optical signal forwarded by the front-end and converts it into a downlink RF signal, which is then transmitted to the back-end microwave amplification and filtering module. The back-end microwave amplification and filtering module further conditions the signal before transmitting it to the back-end satellite ground testing equipment. The uplink and downlink signal transmission processes are identical, but the transmission directions are opposite.

[0060] The optoelectronic converter module, including the downlink optoelectronic conversion module and the uplink electro-optical conversion module, completes the optoelectronic conversion and electro-optical conversion to meet the system return loss and wavelength parameters; the downlink optoelectronic conversion module converts the downlink optical signal of the front-end spacecraft into a downlink radio frequency signal; the uplink electro-optical conversion module converts the uplink radio frequency signal transmitted from the back end into an uplink optical signal.

[0061] The back-end microwave amplification and filtering circuit completes narrowband filtering, in-band flatness, and gain stabilization for uplink and downlink RF signals;

[0062] Branch test module, completes real-time adjustment indication quality monitoring of uplink and downlink RF signals;

[0063] The back-end microwave and optical signal monitoring module completes parameter index and status monitoring of the photoelectric converter module, microwave amplification and filtering circuit to ensure real-time control.

[0064] Furthermore, the mooring control box includes an optical fiber automatic retractable cable box, a power conversion control module, a switch control module, and a signal transmission optical fiber.

[0065] The optical fiber automatic retractable cable box completes the sending and receiving management of the tethered power supply signal transmission cable, and automatically realizes automatic operation in unmanned mode based on online tension recognition;

[0066] The power conversion control module completes the power processing and conversion of the oil generator to meet its own needs and the use of optical fiber power supply;

[0067] The switch control module completes the power supply startup of the entire system and is accompanied by real-time detection function;

[0068] Signal transmission optical fiber, used for active transmission in areas where no cables are laid;

[0069] The system uses a tethered control box to control the transmission and reception of the tethered optical fiber. The distance between the UAV platform and the rocket's launch port is different before and after launch. It needs to leave the launch area quickly before launch to avoid being burned. The UAV platform needs to fly quickly from close to the rocket to far away from the rocket. The tethered optical fiber needs to be able to automatically retract and extend with the movement of the UAV to avoid entanglement accidents. Therefore, the tethered control box can meet the rapid recovery and release operations of the optical fiber to provide the UAV platform with flight in any direction.

[0070] Furthermore, the six-rotor UAV platform provides a load installation section to meet the requirements of real-time positioning and status monitoring, provides real-time monitoring feedback from the camera, and has its own safety mode. The appropriate six-rotor UAV can be selected according to the requirements of the weight and size of the carried load.

[0071] like Figure 4 As shown, during the actual test, personnel on the ground control the six-rotor drone to take off and adjust the direction of the transceiver antenna of the front-end RF fiber optic conversion unit so that its main beam can be accurately aligned with the rocket's wave transmission port. At this time, the six-rotor drone is controlled to be in a hovering state to ensure that it can stably transmit, receive and forward test signals, and connect it to the back-end RF fiber optic conversion unit through optical fiber, so as to achieve stable and reliable forwarding between the launch station spacecraft signal and the back-end ground satellite terminal equipment without relying on the launch tower.

[0072] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solutions of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the scope of protection of the technical solutions of the present invention.

Claims

1. A tethered UAV RF fiber optic forwarding system without a transmission tower, characterized by: It includes front-end RF fiber optic conversion unit, airborne power conversion module, tethered power signal transmission cable, six-rotor UAV platform, tethered control box, back-end RF fiber optic conversion unit, and power generator; The front-end RF fiber optic conversion unit and airborne power conversion module are mounted on the six-rotor UAV platform; the power generator and tethered control box are deployed on the ground; The back-end RF fiber optic conversion unit is deployed in the back-end test plant. The tethered power supply signal transmission cable is connected to the tethered control box at one end on the ground, and to the front-end RF fiber optic conversion unit and the onboard power conversion module at the other end on the aircraft. The front-end RF fiber conversion unit receives the downlink RF signal from the spacecraft, converts it into a downlink optical signal after signal processing, and transmits it to the tethered control box. At the same time, it receives the uplink optical signal transmitted by the tethered control box, restores it into an uplink RF signal, and then radiates it to the onboard equipment of the spacecraft through air-feed. The onboard power conversion module receives AC power from the tethered control box and converts it into DC power to power the front-end RF fiber optic conversion unit; The back-end RF fiber optic conversion unit receives the downlink optical signal output by the tethered control box, converts it into a downlink RF signal after signal processing and transmits it to the ground-based back-end satellite signal processing equipment; at the same time, it receives the uplink RF signal transmitted by the ground-based back-end satellite signal processing equipment, converts it into an uplink optical signal and transmits it to the tethered control box; The power generator is connected to the moored control box to provide power for it.

2. The RF fiber optic forwarding system for a tethered drone without relying on a transmission tower according to claim 1, characterized in that: The front-end RF fiber conversion unit includes a transceiver antenna module, a transceiver shared conversion module, a front-end amplifier module, a front-end microwave amplification and filtering module, an electro-optical modulation conversion module, and a front-end microwave and optical signal monitoring module; The transceiver antenna module receives the downlink radio frequency signal radiated by the onboard equipment of the spacecraft and transmits it to the transceiver shared conversion module; the transceiver antenna module also receives the uplink radio frequency signal transmitted by the transceiver shared conversion module and radiates it to the onboard equipment of the spacecraft; The transceiver shared conversion module receives the downlink RF signal and transmits it to the front-end amplification module after signal attenuation control, multi-stage unidirectional isolation, and switching control. At the same time, it receives the uplink RF signal transmitted by the front-end amplification module and transmits it to the transceiver antenna module after multi-stage unidirectional isolation, switching control, and signal attenuation control. The front-end amplifier module receives the downlink RF signal, amplifies it, and transmits it to the front-end microwave amplifier and filter module after signal processing. At the same time, it receives the uplink RF signal transmitted by the front-end microwave amplifier and filter module, amplifies it, and transmits it to the transmit-receive shared conversion module. The front-end microwave amplification and filtering module receives the downlink RF signal, transmits it to the electro-optical modulation and conversion module after amplification, filtering and conditioning; at the same time, the uplink RF signal transmitted by the electro-optical modulation and conversion module is received, amplified, filtered and conditioned, and then transmitted to the front-end amplifier module; The electro-optical modulation and conversion module receives the downlink RF signal, converts it into a downlink optical signal through electro-optical conversion, and transmits it to the ground tethered control box via the tethered power supply signal transmission cable. At the same time, it receives the uplink optical signal transmitted by the tethered power supply signal transmission cable, and transmits it to the front-end microwave amplification and filtering module after optical-electrical conversion. The front-end microwave and optical signal monitoring module is used to complete the monitoring and processing of each unit of the transceiver shared conversion module, front-end amplification module, front-end microwave amplification and filtering module, and electro-optical modulation conversion module.

3. The RF fiber optic forwarding system for a tethered drone without relying on a transmission tower according to claim 2, characterized in that: The transmitting and receiving shared conversion module includes a programmable attenuator, a circulator, an uplink transmitting link, and a downlink receiving link; the programmable attenuator is used to condition the uplink and downlink radio frequency signals; The circulator is used for simultaneous bidirectional transmission of uplink and downlink RF signals. The uplink transmission link performs unidirectional isolation, shunting, switching control, and signal power amplification on the uplink RF signal. The downlink receiving link performs unidirectional isolation, switching control, signal low-noise amplification, and shunting on the downlink RF signal.

4. The RF fiber optic forwarding system for a tethered drone without relying on a transmission tower according to claim 3, characterized in that: The uplink transmission link includes an uplink secondary unidirectional isolator, an uplink signal splitter, an uplink switch, an uplink power amplifier, and an uplink primary unidirectional isolator; The uplink secondary unidirectional isolator is used to isolate the transmit and receive links; Uplink signal splitter, which diverts the uplink RF signal to the bypass for uplink RF signal pattern detection and real-time monitoring; Uplink switch, which switches the uplink transmission link according to the signal system; The uplink power amplifier completes the power amplification of weak signals; the uplink first-level unidirectional isolator is used to isolate the transceiver link.

5. The RF fiber optic forwarding system for a tethered drone without relying on a transmission tower according to claim 3, characterized in that: The downlink receiving link includes a downlink primary unidirectional isolator, a downlink switching switch, a downlink low-noise amplifier, a downlink signal splitter, and a downlink secondary unidirectional isolator; the downlink primary unidirectional isolator is used to isolate the transceiver link; the downlink switching switch performs switching according to the signal system; the downlink low-noise amplifier is used for signal low-noise processing; the downlink signal splitter diverts the signal to a bypass for signal pattern detection and real-time monitoring; The downstream secondary unidirectional isolator is used for transmitting and receiving isolation.

6. The RF fiber optic forwarding system for a tethered drone without relying on a transmission tower according to claim 1, characterized in that: The tethered power supply signal transmission cable includes a tethered power supply cable transmission conductor and a tethered signal transmission optical fiber; the tethered power supply cable transmission conductor is made of alloy aluminum material and is used to transmit power, and the tethered signal transmission optical fiber is used to transmit uplink and downlink optical signals.

7. The RF fiber optic forwarding system for a tethered drone without relying on a transmission tower according to claim 1, characterized in that: The mooring control box includes an automatic optical fiber retractable cable box, a power conversion control module, a switch control module, and a signal transmission optical fiber; the automatic optical fiber retractable cable box completes the sending and receiving management of the mooring power supply signal transmission cable, and automatically realizes automatic operation in unmanned mode based on online tension recognition; The power conversion control module completes the power processing and conversion of the oil generator; the switch control module completes the power supply and startup of the tethered control box, and is accompanied by real-time detection functions; the signal transmission optical fiber is used to connect the tethered control box and the back-end RF optical fiber conversion unit to bidirectionally forward the upstream and downstream optical signals.

8. The RF fiber optic forwarding system for a tethered drone without relying on a transmission tower according to claim 7, characterized in that: The signal transmission optical fiber is laid in a movable manner by a moored control box, and the length is greater than 1 km.

9. The RF fiber optic forwarding system for a tethered drone without relying on a transmission tower according to claim 1, characterized in that: The back-end RF fiber conversion unit includes a photoelectric converter module, a back-end microwave amplification and filtering circuit, a branch test module, and a back-end microwave and optical signal monitoring module; The photoelectric converter module receives the downlink optical signal transmitted by the tethered control box, and transmits the downlink radio frequency signal to the back-end microwave amplification and filtering circuit after photoelectric conversion. At the same time, it receives the uplink radio frequency signal transmitted by the back-end microwave amplification and filtering circuit, and transmits the uplink optical signal to the front-end tethered control box after electro-optical conversion. The back-end microwave amplification and filtering circuit receives the downlink RF signal, performs narrowband filtering, in-band flatness, and stable gain processing, and outputs it to the shunt test module. At the same time, it receives the uplink RF signal transmitted by the shunt test module, performs narrowband filtering, in-band flatness, and stable gain processing, and outputs it to the photoelectric converter module. Branch test module, completes real-time adjustment indication quality monitoring of uplink and downlink RF signals; The back-end microwave and optical signal monitoring module completes the parameter index and status monitoring of the photoelectric converter module, microwave amplification and filtering circuit.

10. The RF fiber optic forwarding system for a tethered drone without relying on a transmission tower according to claim 2, characterized in that: The six-rotor UAV platform has an installation cross-section that can adapt to the size and weight of the front-end RF fiber optic conversion unit and the airborne power conversion module, and by controlling the six-rotor UAV platform, the main beam of the transceiver antenna module can be accurately aligned with the rocket's wave transmission port.

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