Performance Analysis of Integrated Navigation Algorithm Based on GNSS-VTL and INS for Jamming Robustness Under Dynamic Condition

초록

The Vector Tracking Loop (VTL) enhances the robustness of a Global Navigation Satellite System (GNSS) receiver by using inter-channel interaction, offering improved signal tracking performance under jamming and weak signal conditions. However, in a signal-blocking environment, the standalone VTL can't process the signal, requiring integration with an Inertial Navigation System (INS). While the VTL/INS integration has been studied for that reason, most prior works have focused on limited or idealized interference scenarios, lacking evaluation under diverse jamming conditions. This paper addresses this gap by simulating five types of jamming signals which are Continuous Wave Interference (CWI), Pulse, Chirp, Matched Spectrum Interference (MSI), and Band Limited White Interference (BLWI) at varying power levels, along with signal blocking periods in a dynamic environment. A MATLAB based simulation in this paper compares the navigation performance of the Scalar Tracking Loop (STL), the VTL, and the VTL/INS loosely coupled (LC) systems. Results show that the VTL significantly outperforms the STL under jamming, and the VTL/INS LC offers the most robust performance even during signal outages. This study provides a more comprehensive performance analysis of the VTL/INS under realistic jamming and signal blocked conditions.

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