Airborne Aviation Radio If Module Design And Hardware Implementation

The exactitude and un-detective at in military communication field is important to the war. In the last decades of the twentieth century, the spread spectrum and hopping spectrum technology had used in military communication. With he appearance of LSI in last several decades, large sum of fast digital signal processors had been invented. Simultaneity, the spread spectrum and hopping spectrum transmitter was been develop continually based on the concept of software wireless radio. This dissertation engage in the research of the signal source and signal transmitting channel's code and decoding on spectrum spread radio station. The main contributions of this dissertation are listed blow:The CVSD code is used for the radio voice coding. The aim of anti-interfere in actual communication circumstance is the major reason to choose CVSD. For validating the algorithm of CVSD and getting the appropriate parameters, the CVSD algorithm is simulated on MAT LAB firstly. In addition, the simulation also takes some tips for us during the period of hardware debugging.A scheme is proposed to analog modulation/demodulation's digital realization that based on software wireless radio idea. Moreover, a project has been finished based on MCU & DSP system.An amalgamation of analog and digital modulation/demodulation on a chip is realized and the DSP function is rebuilt under the alterable states. The medium frequency model of the software radio station is realized in DSP hardware platform. Many important modules based on digital base-band are analyzed. A detailed process about the FIR filter processing is also designed. Finally, we have designed the hardware platform.For the purpose of convenience, the whole program is been encapsulation as an individual model. For the aim of expansibility and upgrade, we leave many interfaces as the upgrade input & output interfaces that to realize difference functions in the future. So, during the period of study, two parts should be emphasized: first, the designers can use this module very easy, and the other one is many hardware sources were left to upgrade.