低轨卫星可重构通信系统设计

The Design of Reconfigurable LEO Satellite Communication System

提出一种适合于在轨重构的低轨卫星通信系统软、硬件架构方案,从工程实施角度探讨包括天线、RF前端和基带处理单元在内的可重构硬件平台、可重构策略与软件控制流的可行性,分析了可重构卫星通信系统实现的关键技术。利用软件无线电技术,分析了基带和射频前端分离,可裁减、复用式平台实现的基本路径,以及基带、射频天线单元重构的实现方法。通过各常规通信模式射频前端和数字部分的灵活组合,同时支持多频点、多模式的通信制式,达到节省硬件成本和提高系统灵活性的目的。最后研制了一个可重构卫星通信地面测试原理样机,模拟了卫星有效载荷和地面通信站在IS-95体制下两种CDMA加密码字间的动态重构,有效验证了本文提出的可重构策略的正确性与合理性。

A type of in-orbit reconfigurable software/hardware architecture scheme was proposed for LEO satellite communication system. Reconfiguration strategy, hardware platform and control method were discussed. The key technology of implementation feasibility was analyzed in the paper. Software design radio method was fixed on the implementation of reconfigurable and reusable communication system, by which the cost could be reduced and capability could be much more flexible. Ultimately, reconfigurable communication test system is designed, on which the experiment of dynamical switch between two groups of CDMA （IS- 95 system） code can be accomplished. The results validate the rationality and feasibility of reconfiguration strategy.