Echo Simulation of Linear Frequency Modulated Signals with Focus on Close-Range Targets

This article explores the methodology for simulating echoes of linear frequency modulated (LFM) signals, with special emphasis on modeling reflections from close-range targets - a technically challenging aspect in radar signal processing. We will implement fundamental echo simulation techniques using MATLAB's signal processing toolbox, including the generation of LFM pulses through the chirp function and time-delay calculations using cross-correlation methods. The simulation will address near-range target modeling by incorporating precise propagation delay calculations and amplitude adjustments based on radar range equations. Additionally, we will analyze common simulation errors such as range ambiguity and Doppler effects, providing algorithmic solutions for mitigation through techniques like pulse compression and matched filtering. Through this comprehensive approach, readers will gain practical knowledge for implementing high-fidelity LFM echo simulations and developing robust solutions for various radar simulation challenges.