Shortwave Communication Digital Technology For Aviation Electronic Equipment

The development of aviation electroni c equipment is in highly integrated direction. In order to m eet the dem and of the system of aircraft, being of more functions, better expandability and structural reorganization in a smaller space, th e traditional airborne shortwave radio is from equipment grade to the modular evolution. In addition, as the developm ent of softwa re radio technology and microelectronics technology, communication technology of digital design is also moving from theory to practice gradually, how to effectively achieve shortwave channel digital processing, has been a research hotspot in the field of shortwave communication.In this thesis, taking a certain type of aircra ft in Integrated Modular A vionics shortwave modular project as the backgr ound, the channel digital design of m ixing, filtering, sampling rate conversion and baseband signal processing key technology are introduced. The m athematical principle on sampling rate conv ersion in the interpolation and decimation is given in detail, a kind of new low complexity of digital quadrature mixing structure is put f orward. In view of the traditional implementation of SSB m odulation by the phase shift m ethod, an SSB modulation by sideband filtering method is introduced, being of small amount of computation.The HF channel digital hardware design with high intermediate frequency receiving and zero intermediate frequency transmitting is in troduced, and its perf ormance allocation method is given in detail. Finally, according to the hardware design scheme, the digital channel software design is described, the algorithm simulation and th e simulation results are given. The simulation results show that the scheme is of the advantages of simple structure and excellent p erformance, which can be used to guide the engineering practice.