Potential candidates for new SBAS signals

Satellite-Based Augmentation Systems (SBAS) provide single-frequency services for aeronautical users by broadcasting corrections and integrity information on L1 frequency. Future dual-frequency services for aeronautical users will be broadcast on L5-I/E5a-I frequency. New services that could be potentially provided by SBAS to non-aeronautical community are currently being investigated. These services may require higher data rates that challenge current SBAS signal definitions. Considering there is, at this time, no standardized SBAS signal neither on L5/E5a-Q component nor on E5b frequency band, an opportunity to evaluate new signal candidates is identified. In this paper, several candidates are proposed and compared with a baseline candidate. The baseline candidate is the current signal structure of SBAS signals, L1-I and L5-I/E5a-I. The comparison is made in terms of data rate, latency, data demodulation performance and receiver complexity as number of real additions and multiplications. It is observed that it is possible to increase the data rate and to reduce the latency without degrading the data demodulation threshold and with a reasonable complexity increase. Moreover, a compatibility analysis has been conducted which shows an impact smaller than 0.1dB of C/No degradation in any signal processing operation of any L5/E5a frequency band signal.

[1]  Marco Anghileri,et al.  Ultra-Sparse Binary LDPC Codes with CSK Signals for Increased Data Rates in Future GNSS , 2018, 2018 9th ESA Workshop on Satellite NavigationTechnologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC).

[2]  Olivier Julien,et al.  Analysis of the use of CSK for Future GNSS Signals , 2013 .

[3]  Per Enge,et al.  L1/L5 SBAS MOPS to Support Multiple Constellations , 2012 .

[4]  Per Enge.  WAAS MESSAGING SYSTEM: DATA RATE, CAPACITY, AND FORWARD ERROR CORRECTION , 1997 .

[5]  Hans-Peter Plag,et al.  Provision of Emergency Communication Messages through SBAS: The ESA ALIVE Concept , 2005 .

[6]  Matteo Paonni,et al.  On Efficient and Low-Complexity Decoding of Binary LDPC-Coded CSK Signals for GNSS Links with Increased Data Rates , 2020, 2020 IEEE/ION Position, Location and Navigation Symposium (PLANS).

[7]  Daniele Borio,et al.  Non-Coherent Processing of Galileo E6b Signals , 2018, Proceedings of the 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018).

[8]  Christopher J. Hegarty.  Analytical Derivation of Maximum Tolerable In‐Band Interference Levels for Aviation Applications of GNSS* , 1996 .

[9]  P. Enge,et al.  Design of the signal and data format for wide area augmentation of the Global Positioning System , 1996, Proceedings of Position, Location and Navigation Symposium - PLANS '96.

[10]  D. Brocard,et al.  Complementary signal structure proposals for future airborne SBAS L5 signal and other non-airborne applications , 2014, 2014 IEEE/ION Position, Location and Navigation Symposium - PLANS 2014.

[11]  David J. C. MacKay,et al.  Good Error-Correcting Codes Based on Very Sparse Matrices , 1997, IEEE Trans. Inf. Theory.