读取GPS的观测O文件，读取速度较快，不占用过多内存-GPS observations O file reading, reading speed, do not take up too much memory

SIMD指令函数包，对速度有要求的朋友赶快下，里面有FFT函数，比普通指令要快接近4倍。可用在GPS的数据密集运算中，可以达到实时运行。-SIMD instruction function, package, asked a friend of the speed quickly, the inside FFT function, than the average close to 4 times faster instruction. Can be used in GPS, data-inte

PIKSI是一个开源的GPS项目，速度快，这个是他们的bootloader程序，用于烧写FLASH，值得一看，对stm32f4的操作比较精妙-PIKSI GPS project is an open source, fast, this is their bootloader program for programming FLASH, worth a visit, for the operation is relatively subtle stm32f4

支持GPS和GALILEO的软件接收机，执行速度快，可以达到实时效果(Software receivers that support GPS and GALILEO)