Research On Signal Generation, Processing And Storage Techniques For Miniature Rardar

The thesis concerns the systematic design and research on key techniques for a miniature rardar system, including wideband signal generation, processing and data storage. Under the strict constraints of mini-size, light-weight and low-power consumption, there are great difficulties to realize wideband radar signal generation, real-time processing and high rate mass data storage.Firstly, the principle of the DDS is introduced in this paper, and wideband radar signal generator based on AD 9910 is designed and implemented. Then the nonlinear phase error accompanying with the generation of frequency-modulated continuous wave (FMCW) signal generated by AD 9910,which have adverse effect on signal processing, is compensated by a proposed method by combining digital ramp modulation mode with RAM modulation mode. The performance of the FMCW signal compensated by the proposed method is analyzed and confirmed by experiment result.For generating radar signal with wider bandwidth, FMCW signal generator based on FPGA are designed by using DDS combined with DDR technology. Considering the characteristics of FMCW signal and the performance of the chip, the design of phase accumulator has been especially discussed. The FMCW signal generation based on FPGA is proved a feasible and good-performance method through the analysis of the hardware output.The implementation methods of real-time pulse compression technology are studied based on FPGA IP core technology and fixed-point algorithm. A method of accomplishing FFT and IFFT employing single FFT IP core, which saves more FPGA resource compared with the present way with two FFT IP cores, is adopted in this paper. In addition, the pulse compression modules are designed with the consideration of the resource usage, processing speed and accuracy. The design is validated by an experiment with a signal processor.A miniature solution of mass data storage with high transfer rate is studied. CF card is selected as a storage medium for the miniature rardar. File management system in real-time data storage solutions using FPGA as external host of CF card is designed. Besides, a reading and writing process is designed and optimized for a purpose of saving host resource; and finally, the feasibility and performance of the designed strategy are analyzed and evaluated.