During thewo rk peri2 od of spacecraft, the system can be influenced by many facto rs related to hardw ere and softw ere, the p recision of o rbit determ inat ion can be sho rt of request.

• 由于航天器自主定位系统在工作期间会受到硬、软件等诸多因素的影响,因而使其定位精度达不到预计要求。