Radar frequency-comparison monopulse validation using FPGA-generated wideband chirp waveforms

In this paper, we introduce a frequency-based Direction of Arrival (DoA) estimation technique for wideband radar systems employing Linear Frequency Modulated (LFM) signals. Conventional phase-comparison monopulse is subject to estimation ambiguities, especially in the case of a large baseline distance. In contrast, the proposed frequency-comparison monopulse leverages the time-to-frequency mapping property of LFM signals, enabling unambiguous DoA estimation for any antenna spacing. By leveraging a fully digital generation method for LFM signals implemented on the ZCU111 FPGA platform, we carry out a validation test of the frequency-comparison monopulse, demonstrating its effectiveness in addressing the limitations of conventional monopulse.