Ionospheric scintillation is the physical phenomena affecting radio waves coming from the space through the ionosphere. Such disturbance is caused by ionospheric electron‐density irregularities and is a major threat in Global Navigation Satellite Systems (GNSS). From a signal‐processing perspective, scintillation is one of the most challenging propagation scenarios, particularly affecting high‐precision GNSS receivers and safety critical applications where accuracy, availability, continuity, and integrity are mandatory. Under scintillation, GNSS signals are affected by amplitude and phase variations, which mainly compromise the synchronization stage of the receiver. To counteract these effects, one must resort to advanced signal‐processing techniques such as adaptive/robust methods, machine learning, or parameter estimation. This contribution reviews the signal‐processing landscape in GNSS receivers, with emphasis on different detection, monitoring, and mitigation problems. New results using real data are provided to support the discussion. To conclude, future perspectives of interest to the GNSS community are discussed.

中文翻译：

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电离层闪烁下GNSS信号处理的调查：检测，监测和缓解

电离层闪烁是影响从空间通过电离层来的无线电波的物理现象。这种干扰是由电离层电子密度不规则引起的，并且是全球导航卫星系统（GNSS）的主要威胁。从信号处理的角度来看，闪烁是最具挑战性的传播方案之一，尤其是对高精度GNSS接收器和对安全性要求严格的应用（要求准确性，可用性，连续性和完整性）时，闪烁尤其如此。在闪烁下，GNSS信号受幅度和相位变化的影响，这主要损害了接收机的同步级。为了抵消这些影响，人们必须诉诸于先进的信号处理技术，例如自适应/鲁棒方法，机器学习或参数估计。该文稿回顾了GNSS接收器中的信号处理情况，并重点介绍了不同的检测，监视和缓解问题。提供了使用实际数据的新结果来支持讨论。总之，讨论了GNSS社区感兴趣的未来观点。