Exécution de notre outil de synthèse sur un nouvel article

Résumé : Road debris on roadways and airport runways poses significant hazards, thereby necessitating reliable monitoring. Various sensors, such as camera, LiDAR, and radar, have been employed for debris detection, among which a W-band synthetic aperture radar (SAR) system based on a 77 GHz frequency-modulated continuous wave radar has attracted increasing attention. Nevertheless, road debris with small size and low radar reflectivity is challenging to detect, as it is indistinguishable from the background in the SAR intensity image. In this study, we propose a road-debris-detection approach based on differential-phase contrast (DPC). DPC denotes the contrast in the differential phase between elevated debris and the surrounding ground surface. Since this contrast arises from height differences, DPC-based detection is less directly dependent on target-to-background intensity contrast than the conventional SAR intensity-based detection, thereby improving the separability of low radar cross-sectional (RCS) debris. A W-band SAR system for road-debris detection was constructed, and a DPC-based detection framework combining differential-phase-based detection with SAR intensity-based detection was proposed. The detection experiments were conducted on seven types of debris with diverse materials and shapes, including debris with low RCS. Compared with the conventional SAR intensity-based method, the proposed DPC-based detection framework achieved precision, recall, and F1-score of 77.78%, 100%, and 87.50%, respectively, representing improvements of 69.94, 42.86, and 73.71 percentage points. The debris-region differential phase exhibited an average contrast-to-noise ratio of 3.135, which was 2.829 higher than that of the intensity image, confirming that the height-induced DPC provides substantially stronger target-to-background contrast. This enhanced contrast enabled reliable detection of low-RCS road debris under the experimental conditions, demonstrating the effectiveness of height-induced DPC as a discriminative feature.