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  • Optical fiber tethered drone system solution
March 27, 2023

Optical fiber tethered drone system solution

owensong
Tuesday, 10 August 2021 / Published in Technology

Optical fiber tethered drone system solution

Our company developed different types of tethered drone systems, the tethered system length from 50M-200M height, the payload from 5Kg to 50Kg, Heavy load tether system meet different application, also the optical fiber cable tethered system, that can transfer the data and video link via the fiber cable from the air units to the ground station,it is safety and security, the surveillance video from the tethered drone can not be disturbed and hijacked, ensure military level security.

The multi-rotor UAV equipment is connected to the ground power supply system through a cable to obtain energy so that the UAV can achieve long-term hovering in the air through the ground power supply.
System Features
1) Ground power supply, stay in the air for a long time
(2) Simple operation, automatic take-off and landing, automatic take-up and pay-off
(3) Good flight stability, 100m high altitude stable platform
(4) High positioning accuracy, centimeter-level precise positioning

If you are interested in the optical fiber tethered drone system, 50-200M fiber cable, 5-20Kg payload tethered system all are available, contact us for details: info@uavfordrone.com

Optical fiber tethered drone system solution

UAV platform

The UAV flight platform uses a six-rotor UAV. As a safe, stable, and efficient UAV platform, Tianshu-A3 provides high load and excellent flight performance and adopts a modular design to further improve reliability. Sex, more convenient to use. Tianshu-A3 hexacopter UAV platform is mainly composed of frame, power system, power supply system, flight control system, and ground remote control. It can carry cameras, photoelectric pods, micro communication base stations, megaphones, lights, and other tasks Load equipment.

(1) Rack

The six-rotor power layout scheme can provide greater lift. The fuselage is processed and manufactured with high-strength carbon fiber to ensure the overall strength of the aircraft and a certain degree of toughness; the important connecting parts are processed by aviation aluminum CNC to ensure structural strength The weight of the whole machine is also controlled; the arm adopts a fast foldable structure, which can complete the disassembly and assembly of the arm within 1 minute, which is conducive to packaging and transportation.

(2) Power system

The high-efficiency carbon fiber 21-inch propeller is used, which has both rigidity and strength; the high-power and high-efficiency motor have a long service life and good stability. The carbon fiber propeller provides a super load capacity.

(3) Power system

The airborne power system is the main power supply of the drone, which is used to convert the 750V high-voltage direct current transmitted by the tethered cable into a 50V low-voltage direct current for use by the drone. It has high power density, small size, lightweight, good heat dissipation, etc. Features, the power can reach 3000W; in addition to powering the drone, it can also provide 24V, 12V, 5V, and other power supply voltages of different specifications and power of no less than 300W for the load equipment; when the main power fails, the system can automatically switch To the backup power source (lithium battery) to make the drone land safely.

(4) Flight control system

Tianshu-A3 is equipped with a professional-level flight control system, equipped with three sets of IMU and GNSS modules, with software resolution redundancy to achieve a 6-channel redundant navigation analysis system. The module is installed for shock-absorbing design processing, and the data is more accurate, ensuring stable and reliable flight performance and precise control. The built-in flight parameter self-adapting function realizes the free adjustment of the parameters under different loads, which is convenient and easy to use. High-precision D-RTK GNSS is also optional, which can effectively eliminate the influence of magnetic interference and provide centimeter-level positioning accuracy to meet the needs of various professional-level applications.

(5) Remote control

As shown in Figure 3, the remote control integrates the data transmission station, and it can be used with the airborne terminal to achieve smooth control of the drone. The attitude and height of the drone can be controlled through the remote control, and it can be unmanned. Switching of various flight modes of the aircraft (take-off, landing, hovering, etc.).

Tethered cable

The tethered cable is made of ultra-light alloy conductor and built-in Kevlar fiber, which has the advantages of a lightweight, high conductivity, two electricity and one optical fiber cable, and strong tensile resistance.

Tethered cable retracting device

The tethered cable retracting device is used to realize automatic cable retracting control during the take-off and landing of the UAV. It consists of a retractable winch and a system box, which can provide a wired power supply, information transmission, and cables for the tethered UAV The retractable function mainly includes the system box, the mainframe, the cable storage reel, the photoelectric slip ring, the control circuit, and other parts, as shown in Figure 5. The tethered cable retracting device is equipped with a speed control button, which can realize the speed control of retracting and unwinding. All connectors of the box body have a waterproof design or a waterproof sheath.

Ground power module

The ground-side AC/DC power module converts the 380V/220V alternating current output by the generator into a stable and reliable 750V high-voltage direct current, which is transported to the airborne end through a tethered cable for use by the drone. The AC/DC power module has the characteristics of small size, lightweight, high conversion efficiency (≥94%), etc., and has instantaneous protection against overvoltage, overcurrent, overtemperature, and fault isolation capabilities, and can work stably in various harsh environments.

AirPower Module, the power module install on the drone.

The ground-side AC/DC power module converts the 380V/220V alternating current output by the generator into a stable and reliable 750V high-voltage direct current, which is transported to the airborne end through a tethered cable for use by the drone. The AC/DC power module has the characteristics of small size, lightweight, high conversion efficiency (≥94%), etc., and has instantaneous protection against overvoltage, overcurrent, overtemperature, and fault isolation capabilities, and can work stably in various harsh environments.

Tethered UAVs can play the role of “mobile observation tower” and “mobile signal tower” based on their ability to stay empty for a long time, and carry optoelectronic equipment such as optoelectronic pods, cameras, base stations, radios, antennas, and communications. The equipment load is hovering in the air for a long time to perform various tasks.

Photoelectric load

The tethered UAV can carry out long-term, multi-angle, and large-scale monitoring of the ground with a load of photoelectric equipment. Because the UAV is high-altitude monitoring, the observation angle is various, and it is invisible or unclear on the ground. , It is clear from the air, so that more comprehensive image information of the target area can be obtained.

The types of optoelectronic equipment that can be carried on the tethered UAV platform are diverse, including the following typical equipment:

(1) Optoelectronic pods: visible light/infrared/laser and other optoelectronic pods;

(2) Camera: tilt camera, high-speed camera, etc.;

As shown in Figure 7 is a typical application of tethered drones to mount photoelectric payloads, which mainly include two parts: the drone lift-off platform and the ground system:

(1) UAV lift-off platform: multi-rotor UAV platform, photoelectric equipment

(2) Ground system: cable retractable device box, generator, ground power supply, remote control, ground communication equipment (configurable).

By mounting the photoelectric pod on the tethered drone, the ground conditions are monitored from high altitude, and the obtained image information is transmitted to the monitoring operation seat inside the ground vehicle through the optical fiber in the tethered cable, and also through the optical fiber Send the control instructions of the monitoring operation seat to the drone and the pod to the air platform to realize the air-ground two-way interaction of video and data. At the same time, according to needs, the monitoring information can be transmitted to the surveillance and command center at the rear through the airborne or ground communication equipment, and the drone and the pod can be operated according to the commands of the surveillance and command

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