2D_MUSIC

to make dll using matlab

image histogram equilization and edge detection

The modeling and attitude stabilization control problems of a four-rotor vertical takeoff and landing unmanned air vehicle (UAV) known as the quadrotor are investigated.The quadrotor’s attitude is represented by the unit quaternion rather than Euler angles to avoid singularity problem. Taking dynamical behavior of motors into consideration and ignoring aerodynamic effect, a nonlinear controller is developed to stabilize the attitude.The control design is accomplished by using backstepping control technique.The proposed control law is based on the compensation for the Coriolis and gyroscope torques. Applying Lyapunov stability analysis proves that the closed-loop attitude system is asymptotic stable. Moreover, the controller can guarantee that all the states of the system are uniformly ultimately bounded in the presence of external disturbance torque.The effectiveness of the proposed control approach is analytically authenticated and also validated via simulation study.

matlab 实现三自由度无控弹道，程序中包含气动数据，适合飞行力学初学者学习(Matlab realize three degrees of freedom without controlled ballistic, contained in the aerodynamic data, suitable for beginners to learn flight mechanics )

说明：  具有变时滞的二阶微分系统，matlab数值仿真(Numerical simulation of differential system with time-varying delay)

算术编码，matlab实现编码与译码，而且不考虑其精度(Arithmetic coding, matlab coding and decoding achieve, and do not take into account their accuracy)

em will automatically delete the directory of debug and release, so please do not put files on these two directo

AM modulation using matlab is provided within this rar file

水声信道的研究与仿真_魏莉(Research and Simulation of underwater acoustic channel _ Wei Li)

三个空间错开漩涡光束左旋螺旋形焦点在YZ平面的强度分布计算程序(YZ distribution of left handed spiral focal spot)