Enhancing Coverage and Sensing in Space-Air-Ground Networks via a UAV-Assisted ISAC Framework With Satellite Backhaul. - Zhaoxia Ding; Zhaogui Zeng; Shuaishuai Guo; Ruidong Li; Ji Zhong; Tong-Xing Zheng; Hong-Ning Dai; Dengwang Li; Xuran Li (IEEE Open J. Commun. Soc., 2026)