FCAT: Frequency-Domain Cross-Attention for All-Weather Multispectral Object Detection in Low-Altitude UAV Security Inspection of Urban and Industrial Areas. - Li, Kewei; Zhong, Ziyi; Luo, Ziyue; Tian, Haishan; Wang, Kui; Jiang, Han; Xiang, Deyuan; Tang, Weiwei (Remote Sensing, 2026)