google强大的gps地图源代码，可使用自制的离线地图，分辨率超高-source code of google map ， can use GPS for navigation

雷达带宽合成 合成距离向宽带信号，提高距离向分辨率，并画了图-Distance to the radar bandwidth is synthesized wideband signal synthesis, improve range resolution, and painted figure