资源一号02D卫星双频GPS导航系统容错设计

Fault-tolerant Design of Dual-frequency GPS Navigation System for ZY-1-02D Satellite

资源一号02D卫星采用双频GPS导航系统提高定位精度,而空间环境等因素可能引起双频GPS导航系统在轨短暂非定位,从而影响整星时统及有效载荷的持续成像。为此,文章提出双频GPS导航系统容错设计,从整星层面和单机层面进行定位状态、通信状态、时间状态等自主管理及容错处理。试验验证和在轨验证结果表明:采用容错设计的双频GPS导航系统在出现短时间非定位时处理措施有效,能够保证资源一号02D卫星整星连续正常工作。

The dual-frequency GPS navigation system has been applied to ZY-1-02D satellite to improve the positioning accuracy.However,the space environment may cause temporary non-positioning of dual-frequency GPS navigation system on orbit which can affect the entire satellite’s time-keeping accuracy,thus influencing the payload’s continuous imaging quality.In order to overcome this problem,a fault-tolerant design for the dual-frequency GPS navigation system is proposed in this paper.An autonomous management and fault-tolerant processing mechanism of positioning state,communications state and time state are employed to the dual-frequency GPS navigation system from the system’s and product’s perspectives.The test and on-orbit verification results show that the dual-frequency GPS navigation system with fault-tolerant design can work properly and keep the continuity of the ZY-1-02D entire satellite service while encountering temporary non-positioning situation.