Multi-Constellation GNSS Receiver Design and Implementation with Simulink

This paper presents a Simulink-based GNSS receiver that extends the GPS L1 C/A processing capabilities of the SoftGNSS MATLAB code by integrating support for both GPS L1 C/A and Galileo E1 signals. Unlike script-based MATLAB receivers such as FGI-GSRx, the proposed design is modular, highly configurable, and optimized for future hardware implementation through High-Level Synthesis and HDL code generation. By combining signals from multiple constellations, the receiver enhances navigation accuracy and provides position, velocity, and time solutions. The Simulink environment enables intuitive visual prototyping and simplifies customization, making this platform suitable for GNSS research and embedded system development.