Ultra-wideband Sar Imaging Technology And Anti-jamming Performance Analysis

Synthetic Aperture Radar (SAR) is a kind of active microwave imaging radar. It can all-weather, all-day and timely get ground images of wide region and has fine penetrability to vegetation and ground. SAR is pretty important to resources exploitation and military reconnaissance. Today with the development of technology, SAR is paid more attention to due to its great capabilities in high range resolution and robust anti-jamming, so the technology of high resolution SAR waveform design and the technology of anti-jamming have become the hot field in the radar world. The dissertation is focused on ultra wide band (UWB) waveforms, which achieve UWB return without increasing the instantaneous bandwidth, and new anti-jamming method.The research on UWB waveform includes the following aspects:1. Analyses the chirp stepped-frequency waveform synthesizing the wideband signal and the range resolution of chirp stepped-frequency waveform2. Analyses the effect of the carrier frequency error, and the velocity on the synthetic range profile, discusses the radial velocity compensation3. Studied the way to generate the random step frequency signal and gives the corresponding imaging algorithm; analyses the statistical characteristics of output; and gives the methods of sidelobe suppression;4. Discusses the method to design waveform and the steps of SAR imagingThe research about anti-jamming method against digital radio frequency memory (DRFM) jamming are as follow:1. Analyses the principle of DRFM repeat jamming, finds the weakness of the jamming system2. Analyses the possibility of the linear step frequency signal and random step frequency signal to suppress DRFM repeat jamming。...