MATLAB Implementation of GPS Software Receiver with Signal Acquisition and Tracking

This MATLAB code implements a complete GPS software receiver with comprehensive signal processing capabilities. The implementation includes parallel code phase search algorithms for signal acquisition, employing FFT-based correlation techniques to efficiently detect GPS satellite signals. The tracking module utilizes digital phase-locked loops (PLL) and delay-locked loops (DLL) for carrier and code tracking respectively, maintaining signal synchronization through adaptive filtering techniques. The demodulation subsystem extracts navigation data bits using coherent integration and bit synchronization algorithms. Key functions include: - Acquisition: Uses circular correlation with FFT optimization for rapid satellite identification - Tracking: Implements numerically controlled oscillators (NCOs) for dynamic signal following - Parameter Tuning: Allows adjustment of integration time, loop bandwidths, and threshold values - Result Visualization: Provides intermediate output displays including correlation peaks, tracking error signals, and constellation diagrams Users can modify system parameters such as sampling frequency, intermediate frequency, and processing gains to adapt to different signal conditions. The code structure enables step-by-step result examination, facilitating educational understanding of GPS signal processing principles. This implementation serves as an excellent framework for studying receiver optimization techniques, multipath mitigation, and weak signal processing algorithms. The modular design supports easy integration of additional features like assisted GPS (A-GPS) or multi-constellation support.