Polynomial-Phase-Signal_DOA

dutch roll root locus for aircraft using matlab

说明：  对信号的功率谱估计采用BT法功率谱估计。在MATLAB中调试通过。(The power spectrum of the signal is estimated that the use of BT power spectrum estimation method. In MATLAB in the debugger through.)

这个是用于合成孔径雷达图像自聚焦的算法，易于实验，具有良好的效果。适合入门者。(this is a algorithm used for SAR image autofocus. this method is very simple and easy to realize and is suitable for beginner.)

这是一个非正交环境下的程序，两个用户分在一个子载波内，通过分配不同的功率，才接受端采用SIC进行信号消除。(This program is a non-orthogonal environment, within a two-user subcarrier, by allocating different power, only the receiving end of the signal to eliminate the use of SIC.)

说明：  matlab 进行hist_stock_data处理源代码(hist_stock_data)

说明：  主要介绍Matlab的一个函数的使用，如此Matlab(Matlab introduces a function of use, so Matlab)

自己做的一级倒立摆..................(They do an inverted pendulum/................)

The fusion of high-spectral/low-spatial resolution multispectral and low-spectral/high-spatial resolution panchromatic satellite images is a very useful technique in various applications of remote sensing. Recently, some studies showed that a wavelet-based image fusion method provides high quality spectral content in fused images. However, most wavelet-based methods yield fused results with spatial resolution that is less than that obtained via the Brovey, IHS, and PCA fusion methods. In this paper, we introduce a new method based on a curvelet transform, which represents edges better than wavelets. Since edges play a fundamental role in image representation, one effective means to enhance spatial resolution is to enhance the edges. The curvelet-based image fusion method provides richer information in the spatial and spectral domains simultaneously. We performed Landsat ETM+ image fusion and found that the proposed method provides optimum fusion results.

根据直扩原理，首先有随机数发生器产生一系列二进制信息数据（+1，-1），每个信息比特重复Lc次，Lc对应每个信息比特所包含的伪码片数，包含每一比特Lc次重复的序列与另一个随机数发生器产生的PN序列c(n)相乘。然后在该序列上叠加高斯白噪声和形式为i(n)=Acosw0n余弦干扰下次信号，切余弦干扰信号的振幅满足条件A<Lc。在解调器中进行与PN序列的互相关运算，并且将组成各信息比特的Lc个样本进行求和。加法器的输出送到判决器，将信号与门限值0进行比较，确定传送的数据为+1还是-1，计数器用来记录判决器的错判数目。(According to the principle, first some straight expansion random number generator produces a series of binary data (+ 1-1), each information bit repetitive Lc times, Lc for each information bit contains PN code piece count, embraces each bit Lc times repeated sequence and another random number generator produces PN sequence c (n) multiplication. Then in the sequence superimposed on gaussian white noise and forms as I (n) = Acosw0n cosine interference next time signal, cut cosine interfering signal amplitude satisfy conditions A < Lc. In the modem with the cross-correlation operation PN sequence, and the information will comprise the Lc a sample bits peace. The output of the adder judgment device, will signal to compare with threshold 0 data transmitted, determine for+ 1 or-1, counter is used to record the number victimised judgment. )

利用雷达方程，分别分析功率孔径积与检测目标距离的关系，并且画出对两种飞行目标类型的功率孔径积，得出相应的结论。(Radar equation analysis of the relationship between the power aperture product detects the target distance, and draw power aperture product of two flight target type, and draw the appropriate conclusions.)