chap_13

三维射线跟踪程序代码1，对研究电离层中射线跟踪有帮助(1 three-dimensional ray-tracing code, the study of ray tracing in the ionosphere help)

gate exam guide book

surface Acoustic wave device for Apodized filter

通过对高超声速目标各阶段分析，能够实现够高超声速目标的飞行轨迹。(Through the analysis of the hypersonic objectives in each stage, the flight trajectory can achieve enough hypersonic target. )

基于状态空间模型的预测控制算法，带有状态反馈控制(Predictive control algorithm based on State-space with State feedback control)

关于emd经验模式分解的幻灯片，里面给出了多了emd过程，求出imf(emd-imf)

说明：  向量元素的平均值，向量元素的平均值，向量元素的平均值，向量元素的平均值(the average of vector elements)

说明：  随机共振降噪，用于提取强噪音下的微弱信号(Stochastic resonance noise reduction for weak signal extraction under strong noise)

OFDM系统仿真Matlab程序（参数对照2K模式，映射使用4QAM）(OFDM system simulation Matlab program (2K mode control parameter mapping using 4QAM))

产生、播放DTMF音频，基于Goertzel算法估计DTMF音频，完成双音多频(DTMF)信号的检测(Generating, playing DTMF tones, DTMF tones based on the estimated Goertzel algorithm to detect the completion of dual tone multi-frequency (DTMF) signal)