GPSfangzhen

说明：  一阶RC低通滤波，MATLAB仿真分别实现一阶RC低通和高通滤波器，输入信号为正弦信号或者方波信号。 注意截止频率为f = 1/(2*pi*R*C)(The first-order RC low-pass filter and the MATLAB simulation realize the first-order RC low-pass filter and the high-pass filter respectively. The input signal is sinusoidal signal or square wave signal. Note that the cutoff frequency is f = 1 / (2 * pi * r * c))

OFDM(正交频率调制)实现多载波调制基本思想是将带宽信道分解成许多并行的窄子信道，是每个子信道的想干带宽，从而实现平稳衰落。搭建了完整的OFDM信道链路系统，运用三种不同的信道估计方法(LS信道估计、DFT信道估计、Improved-DFT信道估计)，并对AWGN理想信道和衰落信道误码情况进行了仿真和比较。(OFDM (Orthogonal Frequency Modulation) multicarrier modulation basic idea bandwidth channel is decomposed into a number of parallel narrow subchannels, each subchannel wanted bandwidth, in order to achieve a smooth fading. Build a complete OFDM channel link system, the use of three kinds of different channel estimated method (LS channel estimated, to the DFT letter Tao estimates, Improved-the DFT letter Road estimated), and AWGN ideal letter Road and fading channel bit error situation conducted a simulation and comparison .)

本人收集的关于GPS经纬度到直线距离结算公式，求GPS两点夹角以及轴向角的数学理论及示意图。(I collect GPS latitude and longitude to the straight-line distance on the settlement formula, find the angle between the GPS points and the axial angle and schematic diagram of the mathematical theory.)

MATLBA 信道仿真,完成信道卷积码循环码的编译码 不错的(MATLBA channel simulation, complete channel convolution code of cyclic code compiled code is good)

ideal channel selection

说明：  单载波频域均衡 MMSE psk调制 matlab环境(Single-carrier frequency domain equalization MMSE psk modulation matlab environment)

在GPS软件接收机信号处理的过程中，供ＧＰＳ读取卫星信号数据的源代码(GPS reicever)

说明：  8. 单径瑞利信道中的四发四收V-BLAST： (1) 请设计一种具体的导引辅助的信道估计方法，用Simulink进行仿真，测量16QAM调制时的误码率性能。画出比特信噪比与信道估计均方误差的关系曲线，画出比特信噪比与误码率的关系曲线。 (2) 计算所设计方案的频谱效率是多少，单位为bit/Hz/s。(8. Four transmit four receive v-blast in single-path Rayleigh channel: (1) please design a specific navigation-assisted channel estimation method and conduct simulation with Simulink to measure the bit error rate performance of 16QAM modulation.The relation curve between the bit signal-noise ratio and the mean square error of channel estimation is drawn, and the relation curve between the bit signal-noise ratio and the bit error rate is drawn. (2) calculate the spectral efficiency of the designed scheme in bit/Hz/s.)

说明：  输入一天内的小时和分钟以及阶数，自动读取精密星历文件，Neville插值在所给阶数数据中间精度最高，所以会自动选择精度最高的情况插值。替换目录下sp3文件即可完成修改。(Input the hour, minute and order of a day, and automatically read the precise ephemeris file. Neville interpolation has the highest accuracy among the given order data, so it will automatically select the case with the highest accuracy. Replace the SP3 file in the directory to complete the modification.)

get frames from avi file