论文标题
无人机辅助抗界定位的可行性研究
Feasibility Study of UAV-Assisted Anti-Jamming Positioning
论文作者
论文摘要
随着干扰设备的成本和技术困难继续下降，干扰已成为对定位服务的主要威胁之一。不幸的是，大多数传统技术由于其固有的缺点（例如信号强度弱和不利的锚定几何形状）而容易受到干扰攻击的影响。得益于运行较高的灵活性，无人驾驶飞机（UAV）可以靠近用户飞行以增强信号强度的同时保持令人满意的几何形状，从而使其成为上述挑战的潜在解决方案。 In this article, we propose a UAV-assisted anti-jamming positioning system, in which multiple UAVs first utilize time-difference-of-arrival (TDoA) measurements from ground reference stations and double-response two-way ranging (DR-TWR) measurements from UAV-to-UAV links to perform self-localization as well as clock synchronization, and then act as anchor nodes to provide TDoA positioning service for ground用户在干扰下。为了评估所提出的系统的可行性和性能，我们首先得出了无人机自定位的Cramer-Rao下限（CRLB）。然后，对无人机位置的不确定性不确定性和同步误差的影响进行了建模，并进一步得出了用户位置估算的理论根平方误差（RMSE）。数值结果表明，当他们的服务被干扰破坏时，提出的系统是现有定位系统的有前途替代方法。提出的系统的最显着优势是它与现有的用户设备（UE）和定位方法完全兼容。
As the cost and technical difficulty of jamming devices continue to decrease, jamming has become one of the major threats to positioning service. Unfortunately, most conventional technologies are vulnerable to jamming attacks due to their inherent shortcomings like weak signal strength and unfavorable anchor geometry. Thanks to the high operational flexibility, unmanned aerial vehicle (UAV) could fly close to users to enhance signal strength while maintaining a satisfactory geometry, making it a potential solution to the above challenges. In this article, we propose a UAV-assisted anti-jamming positioning system, in which multiple UAVs first utilize time-difference-of-arrival (TDoA) measurements from ground reference stations and double-response two-way ranging (DR-TWR) measurements from UAV-to-UAV links to perform self-localization as well as clock synchronization, and then act as anchor nodes to provide TDoA positioning service for ground users in the presence of jamming. To evaluate the feasibility and performance of the proposed system, we first derive the Cramer-Rao lower bound (CRLB) of UAV self-localization. Then, the impacts of UAV position uncertainty and synchronization errors caused by jamming on positioning service are modeled, and the theoretical root-mean-square error (RMSE) of user position estimate is further derived. Numerical results demonstrate that the proposed system is a promising alternative to existing positioning systems when their services are disrupted by jamming. The most notable advantage of the proposed system is that it is fully compatible with existing user equipment (UE) and positioning methods.
