Quasi-Monostatic High-Temperature Radar Cross Section Measurement in Near-Field Region

High-temperature Radar Cross Section (RCS) measurement has been less studied, with existing challenges in practice. This work puts forward the idea of combining heating and in-situ near-field measurement, designing a near-field high-temperature RCS measurement system that achieves both heating stability and measurement accuracy. Additionally, a time-delay based analysis and extraction method for target echo is developed to suppress interference during near-field measurement, and a system calibration strategy based on the one-port error model is introduced to further enhance measurement precision. The proposed measurement system was constructed and validated through experiments. RCS measurements were performed on a high-temperature alloy plate and a refractory fibrous material at room temperature and 600 °C in the X-band. For the alloy plate, RCS at room temperature and 600 °C exhibits good consistency with a deviation of less than 1.2 dB. In contrast, the refractory fibrous material exhibits temperature-dependent wave-absorbing behavior, verifying the system’s capability to characterize scattering on non-metallic materials.