实现正弦波的傅里叶变换，并且画图 频谱图-The realization of the Fourier sine transform, and spectral graph drawing

电磁频谱在线监测管理系统，基于WebZedgraph开发的无线电在线管理系统。-Electromagnetic spectrum-line monitoring and management system, based on the development of radio WebZedgraph online management system.