| The development of the wireless communication technology has brought great convenience to people’s daily life, promoted the progress of society, make people’s communication become more and more simple, more and more convenient. However, with the development of wireless technology, there are more and more challenges in the dissemination of information, security and legitimacy. Some lawless elements use radio equipment for espionage activities, disrupt the normal order of the exam even remote control bomb terrorist activities, these actions not only undermine the stability of society, but also cause a great threat to people’s production and life. Therefore, timely detect the illegal signal in complex electromagnetic environment and noise interference conditions, judge the signals’ modulation mode through processing the monitored illegal signal, and calculate the characteristic parameter of the signals, and then select the specific disturbances to interference the radio. Ensure legal communication legitimate signals while jamming the illegal signal has become an important direction of the current radio spectrum management.The main work of this project is based around a radio automatic identification signals suppression systems design and implementation of in-depth research. First of all, the paper introduces the basic principles of signal automatic identification of transient feature extraction based on orthogonal transformation introduced in principle. It introduces the principle of extracting instantaneous characters based on orthogonal transform, and explains the automatic identification of signal modulation pattern which based on wavelet transform. Secondly, this paper explains the principle of communication jamming, briefly expounds the aiming jamming theory and time division multi-channel interference theory. Finally, the paper describes the design of the system in detail, and explains the system from two key parts: hardware and software design. Hardware mainly describe the design of jamming system,and software introduce the program of jamming system, Handheld terminals program and the PC program. This paper introduces the design of jamming system’ hardware and software in detail.The jamming system uses the ARM architecture chip-based as controller, and use AD9852 produce a variety of modulation style signal sources, these modulation style signal sources can be selected by jamming system. Automatic identification of signal can eliminate the tedious of manual judgment, and improve the efficiency of repression. This subject is to design the automatic identification signal suppression system has strong versatility and practicality, embodies the advantages of the software radio thought. |
