Research On Deceptive Jamming Technology Against Imaging Radar In Range Dimension

Since the signal bandwidth of tradition radar is narrow and the range resolution is also lower, many targets which has certain size are regarded as one point targets. With the bandwidth of radar increasing, the range resolution is improved. Especially radar of the new system appearing, it enhances the range resolution by transmitting the signal, which possesses large product of time width and bandwidth, and using the technology of pulse compression. Because the new system radar is continuous development, anti-jamming is also strength, which is put forward new request to radar jamming.Firstly, the thesis introduces the signals of high resolution radar (HRR) , the technology of signal processing and the target-model of radar;on the basis of it, the one dimension range profile of HRR is analyzed. Secondly, the theories of range deceptive jamming, shift frequency deceptive jamming and false target jamming are analyzed and simulated. Since the false target jamming profile has the same characteristic to the range profile of HRR, this thesis mainly studies the false target jamming theory and realization technology. Through simulation experiment, it is found that the false targets jamming surely and availably can be used to HRR jamming. Since the false target jamming will cause D/A converter overflowing, the thesis also studies the influence to false target jamming profile by D/A quantizing and amplitude limiting. Finally, it is summarized that the ways to measure and evaluate jamming are often used and a few evaluating rules aiming at SAR are put forward.