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说明：  FIR滤波器设计,非常好，大家请下，20 个字太长了，哈人要求啊(FIR filter design)

无刷直流电机simulink仿真模型,搭建的simulink模型(wu sha dian ji)

已知: 每个飞机只有一个油箱， 飞机之间可以相互加油(注意是相互，没有加油机) 一箱油可供一架飞机绕地球飞半圈，问题:为使至少一架飞机绕地球一圈回到起飞时的飞机场，至少需要出动几架飞机?(所有飞机从同一机场起飞，而且必须安全 返回机场，不允许中途降落，中间没有飞机场)(plane problem)

惯性导航系统误差传播特性分析，北航惯性导航基础大作业，内含matlab程序代码(Inertial navigation system error propagation characteristics analysis, Northern Inertial Navigation foundation work, containing matlab code)

使用MATLAB软件编写程序，然后进行仿真，最后生成图像(Programming using MATLAB software, and then simulated to generate the final image)

说明：  小孔成像，映射一个简单的圆柱体，可以精确计算投影信息(Pinhole imaging, mapping a simple cylinder, projection information can be accurately calculated)

MATLAB惯性导航工具箱，有详细的中文说明和例程，适合初学者使用。(Inertial navigation MATLAB toolbox, detailed descriptions and routines of Chinese for beginners.)

根据后方交会计算的外方位元素求的带定点的地面摄影测量坐标(Calculated according to resection of the exterior orientation elements seeking the ground with a fixed-point coordinates of photogrammetry)

说明：  四旋翼无人机是一种可以被遥控也可以在无人为控制的状态下执行预定任务的飞行器，与传统直升机相比四旋翼飞行器的机械结构简单，且具有高精度，灵活精度以及较低成本的特点，被广泛用于军事侦察，农艺播撒、快递派送、摄影工作等领域。四旋翼飞行器自身具有欠驱动、多变量、非线性等特性，在外界的噪声干扰情况下，增加了四旋翼无人机的不稳定以及控制系统的设计难度。所以对四旋翼飞行器的位姿控制的研究，可以开拓科研人员对控制算法以及滤波算法的认知，具有重要的研究意义。(Four-rotor UAV is a kind of aircraft that can be controlled remotely or perform scheduled tasks without human control. Compared with traditional helicopters, the Four-rotor UAV has simple mechanical structure, high precision, flexible precision and low cost. It is widely used in military reconnaissance, agricultural broadcast, express delivery, photography and other fields. Four-rotor UAV has the characteristics of under-actuation, multi-variable and non-linearity. Under the circumstance of external noise, the instability of Four-rotor UAV and the difficulty of control system design are increased. Therefore, the research on attitude control of Four-rotor aircraft can broaden the knowledge of control algorithm and filtering algorithm for researchers, and has important research significance.)

这是大学数字信号处理的时域采样定理验证实验程序(This is the University of digital signal processing time-domain sampling theorem verification test procedures)