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首页> 外文期刊>IEEE Transactions on Aerospace and Electronic Systems >Acquisition and pointing control for inter-satellite laser communications
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Acquisition and pointing control for inter-satellite laser communications

机译：卫星间激光通信的采集和指向控制

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Communications and range estimation between formation members are essential functions of formation flying. The inherent features of laser free-space link: small weight and mass, power efficiency, broadband, high precision, availability of state-of-the-art components, make it a very attractive candidate for micro-satellite formation flying missions. A single two-way laser link, performing simultaneously communication and range estimation functions between formation spacecraft is being investigated in the framework of Broadband Laser Inter-Satellite Link (BLSIL), a joint Israeli-German applied research project. A unique technique of pointing control system for an intersatellite laser communication and ranging link is presented. In this system, the same laser is used both as a beacon and as a transmitter. To maximize the traffic capacity of the link, the beamwidth is controlled from broad in the acquisition stage, to narrow in the tracking stage. Laser link pointing control presents difficult demands from the beam pointing precision. To establish and maintain the laser link between the satellites in orbit, pointing control must be fast and precise. A hierarchic two-level system control is proposed. The lower level controls the gimbals of the optical head of the electro-optical transceiver; the higher level is a fast closed loop that simultaneously controls the beamwidth and direction. It is the primary subject of the paper. Initial pointing acquisition assumes exchange of position-related information between the satellites to establish the initial line of sight (LOS). After initial acquisition a cooperative extremum-seeking algorithm is used for the fast higher level closed loop control. The paper gives a detailed description of the control algorithms. Representative simulations are presented.
机译：编队成员之间的通信和距离估计是编队飞行的基本功能。激光自由空间链路的固有特征：重量轻，质量轻，功率效率高，宽带，精度高，具有最先进的组件，这使其成为微卫星编队飞行任务的极具吸引力的候选人。在以色列和德国的一项联合应用研究项目宽带激光卫星间链路（BLSIL）的框架内，正在研究一条单向双向激光链路，该链路同时在编队航天器之间执行通信和测距功能。提出了一种用于星际激光通信和测距链路的指向控制系统的独特技术。在该系统中，同一激光器既用作信标又用作发射器。为了最大程度地提高链路的通信量，应将波束宽度从捕获阶段的宽控制到跟踪阶段的窄。激光链路指向控制对光束指向精度提出了艰巨的要求。为了建立和维持在轨卫星之间的激光链路，指向控制必须快速而精确。提出了一个分层的两级系统控制。下层控制电光收发器的光学头的万向节；较高的水平是同时控制光束宽度和方向的快速闭环。这是本文的主要主题。初始指向获取假定卫星之间交换位置相关信息以建立初始视线（LOS）。初始获取后，将协作式极值搜索算法用于快速高级闭环控制。本文对控制算法进行了详细描述。提出了代表性的模拟。

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