Relay Mirror System Research Articles

Enhancing payload capacity to low earth orbit via a relay solution trajectory with laser-powered vehicles

ABSTRACT Low Earth Orbit (LEO) stands as the primary access point for deep space exploration endeavors, encompassing a variety of space missions such as communication satellites, Earth observation platforms, and scientific research missions. In light of the expanding scope of human activities in space, the cost associated with accessing LEO has emerged as a critical focal point for spacecraft designers. Within the spectrum of proposed solutions, laser-powered vehicle has emerged as a viable avenue toward achieving cost-effective launch options. In order to significantly augment the payload capacity of laser-powered launch vehicles destined for LEO, this study introduced a novel Relay Solution Trajectory Flight Scheme. Central to this scheme was the implementation of a relay mirror system affixed to a satellite, which served to stabilize the incident angle of the laser beam directed toward the laser-powered vehicle, thereby ensuring continuous alignment between the laser beam and the vehicle’s axis throughout the duration of the flight. Following the development of comprehensive structural, propulsive, aerodynamic, and trajectory models tailored for the laser-powered vehicle, an optimization of its flight trajectory was conducted, comparing this innovative strategy with two conventional flight strategies. The outcomes of this analysis showcased a notable enhancement of 269.29% in payload capacity compared to conventional strategies that lacked a relay satellite system, within a designated 400 km LEO flight scenario. This endeavor underscored the transformative potential of advanced relay systems in reshaping payload delivery mechanisms and elevating mission feasibility levels, notwithstanding the intricate coordination challenges posed by intricate satellite systems.

Experimental study on beam shaping in a reduced-scale relay mirror system

Improving power coupling efficiency of beam uplink propagation in a relay mirror system is under extensive research in recent years. A typical model of the relay mirror system is established and theory of beam shaping used to improve power coupling efficiency of the relay mirror system is analyzed in detail. A reduced-scale experimental relay mirror system is founded, which has the same Fresnel number as uplink propagation in the relay mirror system with 1.0 m-caliber transmitter and 30 km propagation distance. Phase distribution of the source is optimized by using the stochastic parallel gradient descent algorithm. The experimental results showed that power coupling efficiency of uplink propagation in the reduced-scale relay mirror system was improved from 72.67 to 87.88 % by beam shaping and the bucket power proportion in 5 pixels at the target was improved from 45.49 to 52.78 %.

用于提高中继镜系统能量耦合效率的光束整形

用于提高中继镜系统能量耦合效率的光束整形

用于提高中继镜系统能量耦合效率的光束整形

用于提高中继镜系统能量耦合效率的光束整形

高斯涡旋光束分析及其在中继镜系统中的应用

高斯涡旋光束分析及其在中继镜系统中的应用

高斯涡旋光束分析及其在中继镜系统中的应用

高斯涡旋光束分析及其在中继镜系统中的应用

高斯涡旋光束分析及其在中继镜系统中的应用

高斯涡旋光束分析及其在中继镜系统中的应用

用于提高中继镜系统能量耦合效率的光束整形

用于提高中继镜系统能量耦合效率的光束整形

基于相干合成的中继镜系统光束上行传输分析

基于相干合成的中继镜系统光束上行传输分析

基于相干合成的中继镜系统光束上行传输分析

基于相干合成的中继镜系统光束上行传输分析

基于相干合成的中继镜系统光束上行传输分析

基于相干合成的中继镜系统光束上行传输分析

Beam shaping for the relay mirror system

The model of two-Cassegrain-telescopes system used in a relay mirror system is established and the theory of beam shaping for the relay mirror system as well as optimization control algorithm is analyzed. Experiment of the reduced-scale relay mirror system with 3 mm-caliber transmitter and 0.27 m propagation distance was done. The results show that power coupling efficiency of the system without beam shaping is 72.67% and power coupling efficiency of the system with beam shaping is 84.14%.

Beam shaping for uplink transmission of a relay mirror system

We establish the model of a two-Cassegrain-telescope system that is commonly used in a relay mirror system. With this model, uplink transmission of the relay mirror system is theoretically analyzed. We determined that uplink transmission with turbulence completely corrected is not an optimal mode. We improve power coupling efficiency of the two-Cassegrain-telescope system by optimizing the optical phase at the launching telescope by use of the stochastic parallel gradient descent algorithm. For a 10 km vertical uplink transmission, power coupling efficiencies of the system are 63.10%, 87.82%, and 97.80% corresponding to an open-loop mode, a closed-loop mode, and a closed-loop with optimization mode, respectively. For a 30 km vertical uplink transmission, power coupling efficiencies of the system are 22.35%, 82.66%, and 91.91%, corresponding to an open-loop mode, a closed-loop mode, and a closed-loop with optimization mode, respectively. The results show that power coupling efficiency of the two-Cassegrain-telescope system is significantly improved.

Analysis of the power coupling efficiency of the relay mirror system with the transmitter composed of sub-telescope array

Model of the relay mirror system with the transmitter composed of sub-telescope array is established. With this model, the new system is theoretically analyzed in the paper. Power coupling efficiencies of the 3-sub-telescope array system and the common system are calculated. The results show that power coupling efficiency of the system with new configuration is significantly improved in comparison with the common relay mirror system.

Improving the power coupling efficiency in a relay mirror system using a multiple laser array

We propose a new relay mirror system configuration in which the transmitting telescope is composed of an array of tightly tiled sub-apertures. By controlling the piston-type optical phase in each aperture using the stochastic parallel gradient descent (SPGD) algorithm, it is shown that the intensity distribution can be shaped at the receiving plane and that the power coupling efficiency can be improved.

Energy characteristics study of aerospace relay mirror system

摘要: 介绍了地基激光加天基中继反射镜体系的系统组成及基本工作原理, 重点对中继反射镜的能量特性进行了分析, 得出了作用距离与中继镜口径和目标辐照度的关系, 并给出了计算的实例. 其结果进一步说明了中继镜原理上的可行性, 提出了中继反射镜技术发展应该重点考虑的关键技术. 研究结果对于实际中继反射镜系统的设计有一定的参考意义. 关键词: 中继镜 / 地基激光武器 / 高能激光器 / 辐照度

100 kW功率固体激光中继镜系统对1 km高度目标作用效果模拟

100 kW功率固体激光中继镜系统对1 km高度目标作用效果模拟