Super-Pilots and Flexible Meta-Signals
J.A. Garcia-Molina, C. Vazquez, Miguel Cordero, European Space Agency (ESA)
Date/Time: Thursday, Sep. 19, 5:08 p.m.
Current GNSS systems are essential today for the provision of Positioning, Navigation and Timing (PNT) in many different applications: from positioning in smartphones to synchronization of telecom systems. Moreover, GNSS is expected to be a key player in the derivation of positioning and timing for future applications, including those in the context of autonomous vehicles and the Internet of Things (IoT).
Although GNSS is performing very well in mild propagation conditions, its usage in deep urban and indoor conditions is still an open problem. In this context, the exploitation of signal and spatial diversity is being considered, including the joint exploitation of multiple signals for the generation of meta-signals [1] (providing high code-based accuracies). Moreover, the evolution of current GNSS systems, including the usage of alternative orbits, as well as the exploitation of systems and signals of opportunity, are important candidates to improve the PNT solutions for applications operating in harsh propagation conditions. This goes on top of the potential usage of additional sensors and assistance data on the user receiver side, depending on the target application.
Thus, multi-layer PNT solutions exploiting current and future PNT systems and signals are of interest to enable the most demanding future applications. In this context, the availability of satellite signals providing high-accuracy code-based pseudoranges in harsh propagation conditions is required to support high-accuracy PNT solutions in a global and ubiquitous way for every type of user receiver.
This paper deals with the design and exploitation of meta-signals for the derivation of robust and high-accuracy PNT solutions in harsh user conditions, including fading, multipath or interference events. In particular, the concept of flexible meta-signals is introduced to enable the achievement of high Gabor bandwidths (resulting in high-accuracy code pseudoranges), while minimizing the appearance of side cross-correlation peaks (which create potential false locks [2]), optimizing the intra- and inter-system interference generated in the frequency band exploited, and enabling a flexible processing on the user receiver side.
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