一种具备星间链路的中轨对地观测星座设计

Design of an MEO Earth Observation Constellation with Inter-Satellite Links

采用轨道高度为2165.6 km、回归周期为1天的太阳同步回归轨道建立了一个包含6颗卫星、具备星间链路的中轨对地观测星座。通过卫星自身的侧摆姿态机动功能,可以实现对同一目标1天之内的多次观测,以完成区域性准实时成像、灾害灾情监测等任务,极大地提高了观测的时间分辨率。在星座内部,相邻两颗卫星之间建立了5000 bit/s码速率测控和250 Mbit/s码速率数传的星间链路,能够充分利用单颗卫星在境内的可视弧段,通过地面与单颗卫星建立星地链路就可以同时完成与所有卫星的星地通信。

An MEO earth observation constellation composed of 6 satellites with inter-satellite links in the sun- synchronous reeursive orbit with 2165.6 km altitude and 1-day recursion period is proposed. By the roll attitude maneuver, because the time resolution of observation is increased, the constellation is able to observe a certain target repeatedly in one day and realize quasi real-time regional imaging and disaster monitoring. In the constellation, inter-satellite links between neighboring satellites are designed to provide TT＆C transmission of 5000 bit/s and payload data transmission of 250Mbit/s. As a result, all the satellites can communicate with ground via the only satellite in the visible arc.