GPS-fangzhen

Algoritmos pra reconhecimento facial

能实现GPS时间到UTC时间的相互转换，测试过正确(Can realize GPS time to UTC time transformation between proper test)

主要研究了两种高动态扩频信号快速捕获的方法,即基于FFT 的频域(载波) 并行捕获法和基于FFT 的时域(伪码) 并行捕获法,并使用MATLAB 进行了仿真和比较。仿真结果表明:基于FFT 的频域并行捕获可捕获较大的频偏并跟踪一定 的频率变化率,可用于卫星变轨等高动态、高加速度等飞行过程。而基于FFT 的时域并行捕获可快速捕获码相位,用于在轨飞行的飞行器,可根据轨道参数提前预报其多普勒频偏,但同时需要精密测距的飞行过程。(Research on the quick acquisition method of the high dynamic spread spectrum signals)

使用人工势场法实现避障的无人车路径规划，且具有较多注释说明(Artificial potential field method is used to realize obstacle avoidance path planning of unmanned vehicle, which has many explanatory notes)

该程序为一维大地电磁反演程序，采用非线性反演中的遗传算法进行(MT Inversion, genetic algorithm)

此程序为局部线性嵌入，能够实现降维功能。(This program is locally linear embedding and can realize dimensionality reduction function.)

IEEE 14 bus 的连续潮流计算的MATLAB程序, 不错的参考代码。(Continuation power flow for IEEE 14 bus system)

说明：  ：载波频率偏移是OFDM系统实现的关键问题之一。分析了OFDM 系统载频偏移估计的2 种算法，即利用循环前缀和训练序列方法。它们均为最大似然估计方法。分别讨论了它们的基本 思想、实现方法和仿真结果。可以看出基于循环前缀算法复杂度较小，精度不高，而基于训练序列 的算法有较高的估计精度，但降纸了系统传输效率。(Abstract：Carrier frequency ofset is one of the key problems in OFDM system．Two foundational methods 。cycling prefix—based and training sequence—based algorithms。to estimate OFDM carriers~equency ofset are analyzed．Then it discusses their basic thoughts。implementing methods and simulation resuits． Finally。merits and demerits of every algorithm are supposed．It concludes that the cycling prefix— based algorithm has less complexity and less precision。and that the training sequence—based algorithm has better estimation performance at the cost of transmission efficiency．)

认知无线电中频谱感知的方法，基于能量检测的算法和仿真(energy detection)

以弱信号环境下高性能 GPS 接收机为出发点，围绕接收机的高灵敏度捕获及码片内多径分离技术展开了研究(In weak signal environments high performance GPS receiver as a starting point, high-sensitivity receiver around the chip capture and separation technologies multipath carried out research)