time_echo

说明：  NAND FLASH的多个仿真模型，可以用于接口设计的测试(NAND FLASH multiple simulation model that can be used for the test interface design)

说明：  写出13个简单的Verilog demon，适合初学者观摩学习。配合实验报告，食用更佳。(Write 13 simple Verilog demon, suitable for beginners to observe and learn. With the experimental report, it is better to eat.)

GPS卫星钟差预报模型的精度评定，如：线性拟合模型、带有周期项的线性拟合模型、二次项拟合模型、带有周期项的二次项拟合模型等。(Accuracy Evaluation GPS satellite clock error prediction model, such as: linear fitting model, linear fitting model with periodic term, quadratic fitting model, fitted with a quadratic term cycle models.)

根据GPS观测数据，绘制电离层影像图的VC程序，可应用于气象、航天等领域。(According to GPS observation data, mapping ionospheric image of VC procedures, can be applied in meteorology, aerospace and other fields.)

VGA显示彩条DE2_70开发板 验证过的(VGA display color bar DE2_70 development board validated)

GPS周和秒的计算GPS周和秒的计算GPS周和秒的计算(GPS and second calculation )

说明：  gps tracker protocol of uniguard of model nr024

说明：  QSPI_FLASH_MODEL 可以设计时前端仿真使用(QSPI?_Flash_Model can be used in front-end simulation at design time)

GPS 整周模糊度求解的lambda方法，通过matlab仿真进行实现。(The lambda method of GPS ambiguity resolution is realized by MATLAB simulation.)

C# 编写的GPS定位程序,简单易懂，适于初学者(GPS pisitioning program using C# language)