Multifunction Radar Signal Generator Research

With the rapid development of radar technology, the radar performance has improved a lot. The key of radar application is to emit different radar waveform in different situation. So waveform generation technology is one of the important research content in the radar domain. The waveform generated by 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. Recently, the method of direct digital waveform synthesis to generate the pulse compression signals is widely used in radar systems. With the rapid developing of the programmable chip technique and VLSI, it is the huge advantage of the digital design to use the SOPC technology in radar waveform generation domain for designing high integration, multifunction and agility configuration waveform generator. It also has tremendous engineering meaning.On the basis of DDWS principle, this paper introduces the function principles, hardware circuit structure and application of a multifunctional radar signal generator using SOPC technology. This design regarded as radar signal source to provide multiple assembled output of some radar system can simulate various signal waveforms needed such as LFM, NLFM etc. We can modulate the Doppler frequency and adjust the time delay of the waveform to validate the performance the radar system.The primary work in this dissertation:1. Based on the analysis of direct digital synthesis (DDS), a DDS system is presented, and the theoretical analysis and practical implementation of the system is discussed in details.2. A system structure of radar signal generator based on DDWS and AD9957, which uses SOPC technique, is designed.3. Using FPGA to simulate the UART protocol for testing nonstandard baud rate receiving.4. Implement the hardware of the Radar signal generator and achieve the function testing .5. Implement and debug the software of the SOPC. A communication protocol based on UART is designed to realize the data communication between the radar main controller and the system.