Sar High-resolution Imaging And Anti-jamming Technology Research

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, transmitting time error and the velocity on the synthetic range profile, discusses the radial velocity compensation3. 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 performance of multi-tone phase-modulated (MT-PM) LFM signal and slope-varying (SV) LFM signal including the autocorrelation, cross-correlation and power spectrum3. Analyses a signal processing method for penalizing a DRFM repeat jamming, gives the target simulation.