You are presented with multiple paper abstracts, alongside the associated literature review and chapter titles. Given the provided information, you are going to do a literature review. Please generate a coherent literature review that synthesizes the content, draws connections between different works, highlights major findings, and identifies any gaps in the existing research.

Literature Review Title: Survey of RF Communications and Sensing Convergence Research 
Chapter Title:  B. COMMERCIAL FLIGHT CONTROL 
1. Abstract of Cited Paper (BIB001):  This work is devoted to the design of an analog transceiver for the Aeronautical Radio Navigation Services band (960 to 1215 MHz) as a required step to the exploitation of the Software Defined Radio concept in avionics. The integration of all the equipment operating in this band into a single piece of reprogrammable hardware minimizes the size, weight, power and cost (the so-called SWaP-C requirements) of avionic equipment, as well as it enables easy and fast transition towards a modernization of the Communications, Navigation and Surveillance standards. The main challenges of the design are: To provide the receiver with the dynamic range required by the Minimum Operational Performance Standards; to minimize the SWaP-C requirements by sharing a single High Power Amplifier for all the services specified in the title; and to establish a suitable duplexing technique that allows all the services to meet their operational goals. Along with this design, an operational study of the proposed multiplexing/duplexing schemes is carried out through software simulation, proving the feasibility of the proposed schemes and a small impact on the systems' capabilities.

Literature Review:
In commercial flight air traffic control, a joint sensingcommunications problem has been present for many decades. Radar-like functionality is desired for locating friendly aircraft, while communications with pilots is paramount to coordinating the flight of multiple aircraft near and around airports. Modern systems employ a Mode S beacon radar system, which combines an interrogating radar with a communications response  . In this sense, the Mode S commercial flight system can be thought of as a cooperative radar scheme, where targets respond to radar stimulus with information back to the radar. A related system is the automatic dependent surveillance-broadcast (ADS-B), in which complicit aircraft self-locate via satellite navigation and broadcast their position to allow ground controllers and other aircraft to track their location BIB001 . New software-defined systems are attempting to integrate these various systems to minimize circuitry and maximize flexibility BIB002 .