基于窗函数数字预滤波处理系统的研究

Study on Digital Pre-filtering System Based on Window Functions

由于在FPGA中能够通过FIRIPCore很方便地实现FIR滤波器组。在此,从FIR滤波器组的各种窗函数特性分析入手,分析了各种窗函数在频域内的各种性质,提出了在合理使用FPGA内部资源的前提下,设计适用于不同天文观测的预处理DFB系统中FIR滤波器的设计。通过设计观测具有频率分裂特征的太阳Ⅱ型爆发的DFB,详细论证了该种设计的可行性。

Since the filter banks of FIR（finite impulse response filter）can be achieved conveniently in FPGA（field programmable gate array）by FIR IP core,proceeding from the characteristic analysis of window functions in FIR filter bank,the features of various window functions in the frequency domain are analyzed,and then the FIR design of the different pre-processing DFBs（digital filter banks）suiltable for different astronomy observations is proposed under the premise of the equitable application of FPGA internal resource.A DFB system with solar split-burst-Ⅱis designed.The observation indicates the the design is feasible.