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Journal Articles Navigation Year : 2023

GNSS Channel Coding Structures for Fast Acquisition Signals in Harsh Environment Conditions

Abstract

In this article, we investigate on a new method to jointly design the navigation message with an error correcting scheme. This joint design exploits the "carousel" nature of the broadcasted navigation message and allows both: i) to reduce the Time To First Fix (TTFF) and ii) to enhance the error correcting performances under favorable and challenging channel conditions. We show that the joint design requires error correcting schemes characterized by Maximum Distance Separable (MDS) and the full diversity properties. Those error correcting codes are referred to as Root Low Density Parity Check (Root-LDPC) codes and they can efficiently operate on block varying channels, enabling the efficient and rapid recovery of information over possibly non ergodic channels. Finally, in order to ensure the data demodulation performance over harsh condition, we propose Root-LDPC codes endowed with the nested property, which allows to inherently adapt the channel coding rate depending on the number of received blocks. The proposed error correcting joint design is then simulated and compared with the well-known GPS L1C subframe 2 structure under several transmission scenarios. Simulations show that we can have some enhancement of the error correction performance and a reduction of the TTFF for some scenarios.
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Origin Publication funded by an institution

Dates and versions

hal-04003710 , version 1 (24-02-2023)

Identifiers

Cite

Lorenzo Ortega, Charly Poulliat. GNSS Channel Coding Structures for Fast Acquisition Signals in Harsh Environment Conditions. Navigation, 2023, 70 (3), pp.navi.585. ⟨10.33012/navi.585⟩. ⟨hal-04003710⟩
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