Spoofing attacks in global navigation satellite systems (GNSSs) aim at inducing the estimation of a fake position at the victim receiver. Many devices, including smartphones, are nowadays equipped with both a GNSS receiver and an inertial measurement unit (IMU), which also provides location/movement information, while being immune from GNSS attacks. We propose a spoofing detection technique based on the comparison between GNSS and IMU measurements. The detection is performed through a generalized likelihood ratio test (GLRT), which is efficiently implemented by a matrix multiplication approach. In particular, the device a) estimates its orientation from magnetometer and gyroscope measurements, b) estimates its position, acceleration, and velocity by a maximum likelihood approach, and c) performs the GLRT for spoofing detection. The performance of the proposed GLRT is compared with the Kalman filter innovation test and with the direct comparison method (DCM), both in terms of false alarm/missed detection probabilities and computational complexity.

中文翻译：

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具有 IMU 的设备中 GNSS 欺骗检测的广义似然比测试


全球导航卫星系统 (GNSS) 中的欺骗攻击旨在诱导受害者接收器估计出虚假位置。如今，包括智能手机在内的许多设备都配备了 GNSS 接收器和惯性测量单元 (IMU)，IMU 还提供位置/移动信息，同时免受 GNSS 攻击。我们提出了一种基于 GNSS 和 IMU 测量结果比较的欺骗检测技术。通过广义似然比测试 (GLRT) 执行检测，该测试通过矩阵乘法方法有效实现。特别是，设备 a) 根据磁力计和陀螺仪测量估计其方向，b) 通过最大似然方法估计其位置、加速度和速度，以及 c) 执行 GLRT 进行欺骗检测。在误报/漏检概率和计算复杂度方面，将所提出的 GLRT 的性能与卡尔曼滤波器创新测试和直接比较方法（DCM）进行了比较。