The Design And Implementation Of Signal Processing Board For Some Weather Radar

As a very effective instrument of surveying and forecasting the emergent disastrous weather, Doppler Weather Radar has been widely applied to many branches of the economy, which has brought the far-reaching impact on people's daily lives.This paper focuses on the design and implementation of the Doppler Weather Radar signal processing board. Based on the characteristics and requirements of the Doppler Weather Radar signal processing, this thesis presents a scheme of signal processing board which includes an intermediate frequency (IF) sampling module, high-speed data processing module and fiber communication module. The data processing module was made up of FPGA and DSP. This thesis completes the hardware system design of the signal processing board, describes the design of key circuit and considerations of PCB design, and completes the corresponding signal processing system software development. Software system includes fiber communication module, Link communication module and algorithm implementation. The algorithm is implemted mainly by the process including digital down conversion of the collected datas and calculation of echo intensity, followed by the application of FFT, with which the average Doppler frequency shift and frequency shift spectrum width can be calculated. Finally, we test the performance of fiber communication module and Link communication module, and test the effective number of bits of ADC. The results of the performance test indicate that the signal processing board can be applied to the Doppler Weather Radar signal processing system.