Broadband Isar Interference Technology And Its Simulation

As a high resolution radar, Inverse synthetic aperture radar(ISAR) can image the target at all-weather, whole day hour and long-distance, and has been vast applied both in the military and in public realms. ISAR resolution is continuously improved as the more precise imaging of targets is needed. Meanwhile, wideband ISAR with great anti-jamming ability can work in complex electromagnetic environment and battle field. It is anticipated that high resolution ISAR system will be very important in radar's development in the future and make greater contribution in military detection field.Consequently it is necessary to study the jamming to ISAR. This paper pays attention to two coherent jamming methods based on guide of parameters-deceptive jamming and similar clutter jamming. They are availed to countermeasure ISAR according to experiments.In the preface to this article, the catalog and the present situation of ISAR and jamming to it are introduced. The contents of this paper are outlined.Chapter 2 works on the imaging principle of ISAR, and establishes the echo model of signal which provide theoretic foundation. Meanwhile it produces ISAR imaging algorithm, using RD method on lengthways signal and FFT method on cross-range signal.Chapter 3 deals with the establishment of ISAR target model, including describing moving target geometric model and generating the pattern data as well as coordinate transformation in space.Chapter 4 studies jamming principle to wideband ISAR, and puts forward two coherent jamming methods based on guide of parameters. Base band jamming signal with similar characteristic to radar signal is generated by utilizing parameters and pre-stored jamming mask. Signal coherence make jamming signal energy used more effectively, and the jamming easy to be realized. Chapter 5 introduces the simulation software for wideband ISAR jamming. It gives detailed instruction about design flow and software entity. As experiment platform, the software is helpful for the simulation proof of mentioned jamming methods.Chapter 6 shows plentiful experiment results by using simulation software above. At last the two methods are verified correct and available by the analysis and evaluation to these results.