FMCW Height Measurement System for Complex Urban Environments

A Frequency Modulated Continuous Wave (FMCW) height measurement system designed for complex urban environments is presented, employing a single-antenna structure, multi-threshold OS-CFAR algorithm, and weighted smoothing filtering techniques. The system enhances anti-interference capability and measurement accuracy. The single-antenna structure optimizes signal transmission and reception processes, achieving system miniaturization and high adaptability. The multi-threshold OS-CFAR algorithm utilizes segmented detection and adaptive parameter adjustment to effectively suppress the effects of multipath interference and Rayleigh fading, improving false target suppression rates by approximately 25%. Weighted smoothing filtering reduces Doppler-induced errors by integrating multiple measurement results, limiting the measurement error to within 0.5 m. Experimental results confirm the system's high stability and accuracy in complex environments, providing reliable technical support for height measurement in low-altitude navigation and obstacle detection.