模仿实现雷达扫描，使用UDP实现通信，通信格式：1B通信站编号+GPGGA格式的GPS数据。udp服务器监听2323端口，等待客户端发送数据（server包UDPClinentTest发送测试数据）。基站编号默认为0，经纬度坐标保存在数据库中。udp服务器端将从站编号及经纬度解析后存入数据库。使用html5 的canvas标签实现扫描界面。每隔1s更新一次数据，并将相对位置显示在界面中，同时计算从站距离基站位置和当前速度。界面长1000px,高600px。（另：计算GPS坐标距离公式是参考网上公式，可能有误，请见谅）(Imitation To achieve radar scanning, using UDP to achieve communication, communication format: 1B communication station number + GPGGA format GPS data. udp server listening port 2323, waiting for the client to send data (server package UDPClinentTest send test data). Base station number defaults to 0, latitude and longitude coordinates stored in the database. udp server-side slave number and latitude and longitude resolution into the database. Use HTML5 canvas label to achieve scanning interface. The data is updated every 1s, and the relative position is displayed in the interface, and the distance from the base station to the base station and the current speed are calculated at the same time. Interface length 1000px, 600px high. (And the other: calculation of GPS coordinates distance formula is a reference online formula, may be wrong, please forgive me))