I. Introduction
Sensing has been envisioned to become a key technology in the fifth generation (5G) and beyond wireless communication systems for obtaining emerging applications such as navigation and monitoring [1]. By applying sensing techniques, the quality of service (QoS) in terms of mutual communications as well as continuous detection and tracking of targets can be enhanced [2]. Due to the expansion of global networks and the advancement of air communication and transportation, vital significance has been brought to the task of sensing aircraft for aviation safety, traffic efficiency, and aerial security purposes [3]. By tracking and monitoring the movements of aircraft, not only the airspace traffic can be better controlled, but potential threats or unauthorized airspace entries can be detected promptly as well. Therefore, the enhancement of sensing quality for aircraft remains as a crucial problem.