Airborne Laser Communication System with Automated Tracking

Ke, Xizheng; Liang, Hanli

doi:10.1155/2021/9920368

Cited by 6 publications

(5 citation statements)

References 4 publications

(3 reference statements)

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“…According to the Formula (5), the scanning trajectory of the two-dimensional mirror is obtained by simulation, as shown in Figure 6 The system uses the position of the light spot on the four-quad back information to adjust the pitch angle and azimuth angle of the ror. When the light spot reaches different quadrants, the position in spot is calculated according to the voltage value of each quadrant detector, that is, the offset of the light spot in the x-y direction Dx, D formula of the light spot position is shown in Formula (6) [18]:…”

Section: Working Principle Of the Apt Systemmentioning

confidence: 99%

“…After obtaining the position information the offset of the spot from the center of the four-quadrant detector culate the deflection angle of the beam, as shown in Formula (7) [19 The system uses the position of the light spot on the four-quadrant detector as feedback information to adjust the pitch angle and azimuth angle of the two-dimensional mirror. When the light spot reaches different quadrants, the position information of the light spot is calculated according to the voltage value of each quadrant on the surface of the detector, that is, the offset of the light spot in the x-y direction D x , D y , and the calculation formula of the light spot position is shown in Formula (6) [18]:…”

Section: Working Principle Of the Apt Systemmentioning

confidence: 99%

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Design and Implementation of a Non-Common-View Axis Alignment System for Airborne Laser Communication

Ke,

Shu,

et al. 2023

Photonics

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This paper proposes a non-common-view axis alignment method for the alignment requirements of airborne laser communication systems. The system consists of a ground transmitting end and an airborne relay terminal. The ground transmitting end uses a camera and a pan-tilt for image tracking, while the airborne relay end uses a two-dimensional mirror to control the beam to achieve non-common-view axis alignment between the transmitting and receiving sides. The working principle and process of both the transmitter and receiver of the non-common-view axis alignment system for airborne laser communication were compared with traditional wireless optical alignment methods. The design process of the two-dimensional mirror used in this paper is introduced, the scanning trajectory of the two-dimensional mirror is simulated and analyzed according to the beam scanning principle, and the field experiment link is set up to carry out the airborne laser communication experiment. The experimental results show that when the link distance is 10 m, the tracking errors of the system in the azimuth and pitch directions are 19.02 µrad and 22.35 µrad respectively, and the amplitude of the electrical signal output by the signal detector is 84.0 mV; When the link distance is 20 m, the tracking errors of the system in the azimuth and pitch directions are 39.66 µrad and 33.94 µrad respectively, and the amplitude of the electrical signal output by the signal detector is 23.0 mV. Using this method, the alignment can be completed without data return, and the establishment of the reverse link can also be realized while the transmission link is quickly established, and there is no need for an air stability platform. The feasibility of the application of the non-common-view axis alignment method to the airborne laser communication system is verified.

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Section: Working Principle Of the Apt Systemmentioning

confidence: 99%

Section: Working Principle Of the Apt Systemmentioning

confidence: 99%

Design and Implementation of a Non-Common-View Axis Alignment System for Airborne Laser Communication

Ke,

Shu,

et al. 2023

Photonics

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“…To fulfill the demands for miniaturization and lightweight design of the automatic tracking system for onboard laser communication in a hexacopter unmanned Photonics 2024, 11, 344 2 of 14 aerial vehicle (UAV), Ke Xizheng et al developed a novel structure utilizing stepper motors and quadrant detectors. This design facilitates the capture, alignment, and tracking of the laser beam [10]. Optical antennas are an important component of wireless optical communication systems.…”

Section: Introductionmentioning

confidence: 99%

The Application of a Fisheye Lens in the Automatic Alignment of Wireless Optical Communication

Xu,

2024

Photonics

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To achieve a lightweight design and wide field of view for the automatic alignment system in wireless optical communication, in the receiving antenna—a fisheye lens is incorporated as the receiving optical system. This feature enables the detection and tracking of lasers. The system utilizes a micro motor as the control servo system and a four-quadrant detector as the detection unit. Sequential and non-sequential ray tracing techniques were used to simulate the analysis of the fish-eye lens. Point array diagrams, ray trace diagrams, and encircled energy analysis were utilized to evaluate the spot’s quality. The simulation results demonstrate that the fish-eye lens has a field of view of 120°, and the spot with 80% energy has a diameter smaller than 30 μm. The experimental results indicate that the fish-eye lens effectively captures the light beam within the range of ±30°. The simulated and experimental results for the sum and difference frequency amplitudes show good agreement. The outdoor experiments have demonstrated a tracking error of 22.757 μrad in this system. After alignment, the average output optical power of the detector is 3.23 μW, and the detected waveform amplitude is 12.48 mV. These findings demonstrate the system’s potential for automatic alignment in wireless optical communication. Additionally, the system is relatively simple and practical.

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“…And the accuracy of spot position detection determines the performance of the communication system. Considering that the quadrant detector (QD) has the advantages of a fast response speed, high measurement accuracy, and simple data processing, it has developed into a core device in the space laser communication system [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Research on Quadrant Detector Multi-Spot Position Detection Based on Orthogonal Frequency Division Multiplexing

Ye,

Yu,

Lin

et al. 2023

Applied Sciences

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Free space optical communication is developing towards laser communication networking. A novel method of quadrant detector (QD) multi-spot position detection based on orthogonal frequency division multiplexing (OFDM) is proposed for multi-spot laser communication systems. The mathematical model is constructed, and the Monte Carlo method is used to validate it. The position calculation of three beams incident on QD is simulated. The influence of key parameters on the accuracy of position detection is analyzed when the spots are at the same position and a different position. The results show that when the SNR of the system is 31.74 dB, the radius of the Gauss spot is 2 mm, the number of FFT (fast Fourier transform) points is 1024, and the center of the multi-spot is at the same position of the detector target; the accuracy of signal position detection calculated by the equation is 1.433 μm, and the simulation results are 1.351 μm, 1.354 μm, and 1.389 μm, respectively. When the center position of the multi-spot is at different positions of the detector target, the detection accuracy calculated by the formula is 1.438 μm, 1.433 μm, and 1.434 μm, respectively, and the simulation results are 1.419 μm, 1.387 μm, and 1.346 μm, respectively. The experimental results verify the effectiveness of the proposed multi-target simultaneous detection method. This article proposes a new multi-spot position detection method which can not only achieve one-to-multiple node laser communication but also improve the accuracy of point position detection.

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Airborne Laser Communication System with Automated Tracking

Cited by 6 publications

References 4 publications

Design and Implementation of a Non-Common-View Axis Alignment System for Airborne Laser Communication

Design and Implementation of a Non-Common-View Axis Alignment System for Airborne Laser Communication

The Application of a Fisheye Lens in the Automatic Alignment of Wireless Optical Communication

Research on Quadrant Detector Multi-Spot Position Detection Based on Orthogonal Frequency Division Multiplexing

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