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Abstract
Global Navigation Satellite Systems (GNSSs) are the most widespread technology for Position Navigation and Timing (PNT). They have been traditionally deployed exploiting Medium Earth Orbit (MEO) or Geosynchronous Orbit (GSO) satellites. To meet future demands and overcome MEO and GSO limitations, GNSSs based on Low Earth Orbit (LEO) constellations have been investigated as a radical system change. Although characterized by a higher Doppler effect, a PNT service supplied by LEO satellites can provide received signals that are about 30 dB stronger. Moreover, broadband LEO constellations and the forthcoming mega-constellations can be exploited to deliver a piggybacked PNT service. With this cost-effective solution, a PNT service might be subject to substantial bandwidth limitations. A narrowband implementation of the so-called meta-signal approach in GNSS receivers, namely Virtual Wideband (VWB), can tolerate harsh Doppler conditions while reducing the processed bandwidth. It is thus suited to a secondary PNT service delivered by LEO satellites. The aim of this work is to show the applicability of the VWB architecture to signals provided by a piggybacked PNT service, hosted on a mega-constellation. Through this case study we demonstrate the capability of this implementation to bear high Doppler conditions while empowering the potential of LEO PNT.
Highlights
G LOBAL Navigation Satellite Systems (GNSSs) are by far the most widespread technology for Position Navigation and Timing (PNT)
We present and discuss the processing results provided by the meta-signal processing (MSP) software receiver after tracking realistic Low Earth Orbit (LEO) PNT signals as received by static users at the three reference locations
The LEO PNT approach has gained popularity in recent years as a way to overcome some of the existing GNSS shortcomings
Summary
G LOBAL Navigation Satellite Systems (GNSSs) are by far the most widespread technology for Position Navigation and Timing (PNT). They have been traditionally deployed exploiting Medium Earth Orbit (MEO) or Geosynchronous Orbit (GSO) satellite constellations. Upcoming PNT applications are going to have challenging requirements and a radical system change might be needed to satisfy those demands. Global macro-trends are going to drive the use of GNSS by industries and individuals demanding higher PNT accuracy and security [1]. Manuscript received January 15, 2021; revised March 12, 2021; accepted April 19, 2021. Date of publication May 3, 2021; date of current version August 27, 2021. Date of publication May 3, 2021; date of current version August 27, 2021. (Corresponding author: Andrea Nardin.)
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