Based On Nios Ii Multi-purpose Radar Signal Generator And Implementation

Waveform generation technology is one of the important research content in the radar field. The method of digital waveform synthesis of the pulse compression signals is now widely used in radar systems. The waveform generated using digital systems is of strict coherence, repetitiveness, high stability and programmability, all these factors make it easy to implement the waveform parameter agility and generate arbitrary waveforms in order to meet the urgent needs for anti-interference and strong viabilities of radars under modern EW environment. As the rapidly developing of the programmable chip technique, the SOPC(System on Programmable Chip)now allows the whole system logic function to be built in single chip, thus some function modules can be integrated on one PLD, such as CPU, storage system, I/O port, LVDS etc. SOPC is an efficient and flexible solution.Radar signal generator is used widely in radar performance measuring. This dissertation introduces the work principles, hardware circuit structure and application of a pint-sized multifunctional radar signal generator, which can generate various waveforms needed. By modulating the Doppler frequency and adjusting the time delay of the waveform to validate the performance the radar system. The device can also be used as a signal generator to provide the inputs for other radar system.The primary work in this dissertation:1.Based on the analysis of direct digital synthesis (DDS), this dissertation compares the differences and similarities between direct digital waveform synthesizer (DDWS) and direct digital frequency synthesizer (DDFS). A DDS system is presented, and the theoretical analysis and practical implementation of the system is discussed in details.2. Analysis and compare the advantage and structure of the SOPC and NIOS II.3.A Radar signal generator system structure based on DDWS and AD9857, which uses SOPC technique, is designed.4. Implement and debug the hardware of the Radar signal generator.5.Implement and debug the software of the SOPC. A communication protocol based on USB 2.0 is designed to realize the data communication between the PC and the system.