power-bank

已知：信号中心波长为2,天线阵元的间距为1米,快拍数为2000，空中有四个 源信号,假设它们的频率 四个源信号的方向分别为： 求： 1）在不加入噪声的情况下,观察并计算协方差矩阵特征值,并对它的特点 加以说明 2）分别采用MUSIC算法,CAPON算法, ESPRIT算法在下面四种情况下，对 上述四个信号源的波达方向进行估计,并画出它们的空间谱图； ①在不加入噪声的情况下, ②在加入高斯白噪声的情况下,假设信噪比为10dB 3）在信噪比变化范围为-20dB~+20dB时，分别采用MUSIC算法,CAPON算 法, ESPRIT算法，对上述四个信号源的波达方向进行估计,并画出波达方 向估计误差,随着信噪比变化的曲线图(即横轴为信噪比,纵轴为误差值)()

说明：  电力电子装置故障录波器设计Design of fault recorder power electronic devices(Design of fault recorder power electronic devices)

mimo雷达的实现原理及实现方法，适用于汽车雷达(Principle and implementation of MIMO)

在低风速情况下，风力发电机组的先进变桨距控制策略的程序(Low Wind Speed Turbine Project Conceptual Design Study: Advanced Independent Pitch Control)

说明：  电力方面配电网潮流计算的经典分析文章，介绍了潮流的前推回代法，回路阻抗等方法，尤其是对各种配电网潮流分析方法的分析和比较(Electricity distribution power flow calculation of the classic analysis of the article introduces the trend of pushing back the first-generation method, loop impedance and other methods, especially for a variety of distribution power flow analysis and comparison of analytical methods)

Interfacing microcontroller using RF transceiver

说明：  CRTS3 型轨道的设计思路与设计过程，包括了详细的轨道参数(a model of CRTS3 track)

基于 ARM和 Linux嵌入式平台的 故障录波器通信接口设计(Abstract: To s olve some p r oblems of hardware configure, cost and reliability based on the traditi onalmicr ocomputer2 based fault re2 corder, a scheme for the fault recorderwhich takesARM and DSP as system hardware,L inux as system soft ware is p resented . DSP is used for high2s peed data operati on, and the ARM p latform comp letes terminal contr ol and communicati on . Then a si mp lified structure in s oft ware and hardware comes out . HP I technique is studied in detail in order t o meet the demand of contr ol and high2s peed data communicati on bet ween the t wo kernels .)

these m-files are used to link HYSYS with MATLAB...

说明：  Owing to the broad application value of audio watermarking in remote transmission and mobile extraction, it is very important to study watermarking approaches against A/D and D/A conversion. Based on wavelet decomposition and cepstrum technology, an audio watermarking algorithm is proposed where the low-frequency wavelet coefficients are chosen for cepstrum transforming. Then, the obtained cepstrum data shows stable for watermark hiding by the methods of edging data cutting and statistical mean modification. The synchronization is not required in the algorithm. Experimental results show that the proposed algorithm can resist on the attack of A/D and D/A successfully with features of large capacity and zero bit error. It will be helpful for the mobile audio in secure broadcast and management in the