Efficient Doppler Frequency Simulator for Multifrequency

This article introduces an innovative interpolation-based radar simulation system (IRSS) designed to simulate Doppler frequencies across multiple frequencies with minimal hardware complexity. Traditional radar simulation systems, such as Analog Radar System Simulators (ARSSs) and Digital Radar System Simulators (DRSSs), face challenges when supporting multifrequency simulations due to the need for parallel processing of individual Doppler frequencies. The proposed IRSS exploits linear interpolation and the superposition property, enabling a single interpolation process to handle multiple frequency components efficiently. The IRSS structure was implemented using a field programmable gate array (FPGA)-based universal software radio peripheral (USRP), and its performance was evaluated through experimental testing. The results demonstrated that the IRSS accurately generated Doppler frequencies for both single-frequency and multifrequency signals, maintaining consistency with theoretical predictions. The system effectively simulated Doppler shifts for various target speeds while preserving hardware simplicity, unlike traditional simulators that require increased resources proportional to the number of frequencies. This research highlights the advantages of using linear interpolation to reduce hardware complexity and improve scalability in radar simulators. Consequently, the proposed IRSS provides a cost-effective and efficient solution for modern radar systems that demand multifrequency capabilities, making it well-suited for applications in complex environments such as autonomous vehicles, military operations, and aviation.