Air And Air Communication System And Radio Frequency Design

With adequate technical preparation ,our institute took on the assignment of designing of the air-to-air antenna, the air-to-air communication equipment and the air-to-air interface.My task is the overall designing of the air-to-air communication equipment and the RF front-end part.Right now the project is turning into the formal phase.The air-to-air communication equipment is the crucial part of the communication channels during the docking and rendezvous between airships.The air-to-air communication equipment is comprised by receive channel and transimit channel,and the two channels fulfill the function of receiving and transmiting respectively.The Full Duplex communication equipment is brought into the docking and rendezvous system of airship for the first time .And during the designing process,the calculating the communication channel detailedly and the distributing the performance items of the system properly give enough reference to distributing the performance items of the air-to-air communication equipment.The code interfere derived from the adopting of double hot machine backup and the near-far effect derived from the switching of power are solved by adding the polarization isolation technique of antenna.The RF part of air-to-air communication equipment is composed by receive module and transimit module.Through the job of chooseing local oscillator frequency, duplexer and filter appropriately,the design of local oscillator and filter we can reach the performance requires of transmitter-receiver isolation. We use the phase lock loop technique to design the local oscillator.During the process of signal strength control design,adopting AGC closed-loop control technique to fit the high dynamic of the receive signal.The transimit power can be switched as demand.The metrical performance result of sample machine proved that the designed air-to-air communication equipment can reach the requires .In the last part of this dissertation , the author gives a conclusion and tells the job of next step in this project.