NPP is a risk reduction mission for NPOESS, and will be the first major element of the next generation U.S. Earthobservationsystem when it is launched in 2010.
The study of multiple satellite scheduling that satisfies complicated satellite observation requirements is of great importance in improving the supporting capability of an earthobservationsystem.
研究面向复杂任务需求的多卫星联合下的任务规划技术，对于提高对地观测系统的保障能力具有重要意义。
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SSNDR will consist of several earthobservation satellites operating in different orbits and ground application system, obtaining information of earth environment and natural disaster.