地面大功率干扰源对导航星座星间链路的干扰分析

Jamming effects analysis of ground power jamming source on navigation inter-satellite links

为了定量分析地面大功率干扰源对导航星座星间链路的影响程度,提出单星干扰解析模型,通过等效载噪比定量描述干扰强度,通过测距误差和通信误码率衡量干扰对单颗导航卫星的影响。根据导航星间链路的工作特点,对卫星受干扰导致整星座星地联合定轨及星间转发通信功能异常的原理进行分析。研究结果表明:星间链路系统具有较强的抗地面干扰的能力,地面单个大功率干扰源对星地联合定轨精度的影响小于厘米级,对星间转发通信的影响仅为部分卫星的链路传输代价增加以及直接干扰卫星一段时间内的通信异常。

In order to quantitatively analyze the jamming effects of ground power jamming source on navigation inter-satellite links （ISL）, an analytical model for single satellite jamming was proposed. The model describes jamming signal strength by equivalent carrier to noise ratio （CNR）, and describes jamming effects on single satellite by ranging error and communication bit error rate （BER）. Jamming principle on satellite orbit determination and inter-satellite communication of the whole constellation was analyzed according to ISL operating mode. The results show that ISL has a good anti-jamming performance. Satellites orbit error caused by single ground power jamming source is less than centimeter level. Transmission delay of some satellites increases because of the jamming, and the directly jammed satellite can not communicate for a period of time.