The Design Of Broadband Jamming Detection Receiver

Since the anti-jamming technology is widely adopted in the military field, the study of jamming and anti-jamming has become more and more important. In order to research on the anti-jamming problem in telecommunication system, we must find a way to detect jamming signals. We can take efficient strategy against jamming only after we thoroughly study its parameters. jamming detection receiver is designed to detect parameters of jamming signals through software defined radio technology. Thus it can enhance anti-jamming ability of telecommunication system by either proper modulate method or channel switching.After thoroughly studied the broadband receiver based on software defined radio technology, a jamming signal detection method is proposed in this dissertation which is adapted to the design of the jamming detection receiver's RF.The design of the jamming detection receiver's RF has to be carefully dealt with. Because the receiver's working frequency ranges from 1GHz to 4GHz, it presents a challenge for each module's design and implement of RF. In this paper, a multi-filter method is proposed so as to make the design of antenna signals filter easier; then adopt various digital frequency synthesizer technologies to generate the frequencies which meet the need of accuracy and speed for frequency mixer. And also we use analog AGC along with digital AGC to control the signal's gain so we can process signals later in DSP.Jamming detection function is implemented using FFT algorithm. First apply FFT on the digital jamming signal and analyze the FFT data in frequency domain. It can give out an estimate of the center frequency and the detection's time. Finally, record detailed data of all detected jamming signals for further research.