DownSample

FUN should be written so that any parametric arguments are packed in to xp,

Matlab中实现轮对分析的程序源码和相关的程序源码包，，能实现火车轮轨接触关系的分析 (Round of analysis of program source code and related procedures source package in Matlab, train wheel-rail contact analysis of the relationship)

Direct sequence spread spectrum (DSSS) communication systems has been widely used in these years for its advantage of wide spectrum, low working Signal-to-Noise ratio (SNR), anti-interference, anti-multipath effect and capability of LPI and LPD. They are increasingly replacing conventional communication forms and obtaining extensively applications in modern military and commercial communication systems, for example, CDMA communication system, GPS , measuring and control system, satellite chain, identification of friend or foe and etc. Therefore, corresponding DSSS electronic counter technique becomes a big problem to solve in electronic warfare domain. DSSS electronic counter technique including blind detection, blind parameter estimation and spreading sequences estimation. For the issue of DSSS electronic counter technique of DSSS/QPSK signal damaged by strong additive white Gaussian noise (AWGN), the main research content in this dissertation as follow.

说明：  用MATLAB编写的BP算法在函数逼近中的应用。(BP algorithm using MATLAB written application in function approximation.)

演化算法的一个简单迭代程序，运行后可以看见迭代1000代的结果，权威提供。(Evolutionary algorithm, a simple iterative procedure can be seen running after the iterative generation of the results of 1000, authority to provide.)

本仿真基于李雅普诺夫稳定理论设计的内模自适应控制仿真(The simulation based on Lyapunov stability theory designed internal model adaptive control simulation)

利用旋转矢量算法对惯性导航数据进行解算，包括姿态解算，速度解算，位置解算。(the caculation of inertial navigation with screw algorithm)

Orthogonal Frequency Division Multiplexing (OFDM) is a spectrally efficient multicarrier modulation technique for high speed data transmission over multipath fading channels. High Peak-to-Average Power Ratio (PAPR), which leads to power inefficiency in the RF portion of the transmitter, is a major drawback of OFDM.

MATLAB File for receiver design

这是一个外弹道的简单matlab仿真，其中包含了四节龙格库塔方法（自己编写）程序并用matlab GUI加以实现，可以作为GUI学习的参考，是西北工业大学探测制导与控制技术专业本科课程设计的内容。(This is a simply simulation program by matlab, which contains four Runge-Kutta method program and be realized by matlab GUI,it can serve as a reference for learning GUI,it is from Northwest Polytechnical University probing Guidance and Control Technology undergraduate courses content design. )