Broadband, Multimode The Isar Interference Source And Realization

ISAR gets high distance distinction by eradiating pulse compress and gets high orientation distinction by the radar or the object moving relatively to form a synthetical antenna.It is a important EMC task to jam ISAR.Active jamming is a used method widely because of agility.Jamming source is so important in active jamming system that it can decide the system good or bad.In this paper, by analyzing the jamming source of ISAR principle, the author gets a kind of method of ISAR's jamming source.The source with multi-mode and broadband features by using Altera's SOPC and DUC and DDS.The source has been tested and has proved that the method is practicable.The system's core is a SOPC base on a FPGA. It is different from old structure of jamming signal generator.The obvious excellence of this system is that it has low power sonsume,small volume and software hardware designed on a FPGA together.So,it is very agility.The primary work in this dissertation:1.Analyse the principle of ISAR and GBR.Get a method of generating ISAR jamming signal.2.Analysis the advantages of the SOPC compared to the SOC. Introduce the primary characteristics of the SOPC based on Nios II and the feasibility of the system implementing based on Nios II.3.Raise and finish scheme design and system realization base on ALTERA's SOPC and DUC and DDS.4.Finish the software and hardware design.5.Finish a part of logic design.6.Debug the system including the hardware, application program, driver program.Test the result of the system.