用于灾后遥感的共位衍射卫星隔离方法

The isolation of co-located diffraction satellite for remote sensing after disaster

针对地震发生后对受灾地区高精度地图的获取需求,考虑到静止轨道轨位的紧张性,研究了一种基于共位衍射的卫星成像系统。该系统由两颗共位卫星构成,一颗为成像卫星,另一颗为薄膜衍射卫星,相比于传统的单颗成像卫星,该系统具有响应迅速以及空间分辨率高的优势。本文基于共位策略和隔离策略相结合的设计原则,采用倾角/偏心率协调隔离的方法,设计了一组轨位在10.6E定点经度内的共位衍射成像系统轨道根数。通过仿真分析,将各个共位卫星之间相对距离与实际在轨卫星的相对距离做对比,仿真结果与实际数据间的误差满足一定的设计要求。因此,该组轨道根数在实际在轨应用中具备一定可行性,本文设计的共位衍射卫星系统为灾后应急响应提供重要参考。

Aiming at the need of high precision map acquisition of the disaster area after earthquake and consider­ing the tense of the geostationary orbit, animaging system based on the co-location diffraction is studied. The systemconsists of two co-location satellites, one is an imaging satellite and the other is a thin-film diffraction satellite. Compared with the traditional single imaging satellite the new system has the advantages of quick response and spa­tial resolution. Based on the design principle which are combined of the co-location strategy and the isolation strate­gy ,a group of orbital dements of the co-location diffraction imaging system within the fixed point longitude of 10.6E were designed by using the Inclination/eccentricity coordination isolation method. In the end,the relative dis­tance between the two co-location satellites are simulated. Compared the simulation result with the actual data of on-orbit system, the error can satisfy the design request. In summary, the designed orbital elements have the feasi­bility in actual application,and the co-location diffraction satellites system can provide reference for fast responseafter earthquake.