This article is the first part of a two-part manuscript addressing the DME/TACAN multipath (MP) impact on the future airborne GNSS Dual-Frequency Multi-Constellation (DFMC) GNSS L5/E5a receiver. GNSS L5/E5a signals and DME/TACAN pulsed signals share the same Aeronautical Radionavigation Service frequency band with consequent interference. The interference is characterized in civil aviation standards by the GNSS signal $C/N_0$ degradation model at the DFMC correlator input. This model assumes the presence of a temporal blanker at the DMFC Radio-Frequency Front-End block output to mitigate the DME/TACAN pulsed signals. It relies on the definition of the above blanker pulse width (${{\mathrm{pw}}^{\text{eq}}}$) and the below blanker equivalent pulse width (${{\mathrm{PW}}^{\text{eq}}}$). However, this model did not consider the presence of DME/TACAN pulsed signals MP. Therefore, the objective of this paper is to propose two revised versions of the $C/N_0$ degradation model, the statistical and the fixed environment models, where the impact of the DME/TACAN MP is accounted for by an updated formula of ${{\mathrm{pw}}^{\text{eq}}}$ and ${{\mathrm{PW}}^{\text{eq}}}$. The MP modeling is especially important at low altitude where data measurement campaigns have highlighted the MP impact on the temporal blanker. Both models are designed to cover different needs: the statistical model is a low complexity model completely defined by closed-form formulas designed for standardization purposes, and the fixed environment model is a high complexity model able to provide the $C/N_0$ degradation for any specific set of DME/TACAN signal conditions, which is used in this work to inspect the limitations of the statistical model.
DME/TACAN Multipath Impact on GNSS L5/E5a Airborne Receivers Part I: C/N0 Degradation Model
IEEE Transactions on Aerospace and Electronic Systems ; 60 , 5 ; 6765-6786
2024-10-01
3775886 byte
Article (Journal)
Electronic Resource
English
IMPACT OF DME/TACAN ON GNSS L5/E5A RECEIVER
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