Google谷歌地图纠偏数据库(GPS经纬度纠偏).至于纠偏是什么意思可以自己百度一下-Google Google Map correction database (GPS latitude and longitude correction) The correction What does it mean to own Baidu

实现gps无电离层改正和无对流层改正的单点定位 ，精度30m左右-Realize the GPS without ionospheric correction and tropospheric correction of single point positioning, precision about 30 m

gps-ins导航包括定位结算，姿态校正，速度校正等，也包括惯性导航系统的模型建立，结算，白噪声，(GPSins Kalman filtering, including clearing positioning, posture correction, the speed correction, including inertial navigation system model, clearing, white noise, etc.)