Abstract: With the development of surveying and mapping technology,unmanned aerial vehicles(UAV) have been widely used in hydraulic engineering.It has improved the efficiency of water conservancy surveying and mapping work.It has also brought about problems such as searching for and monitoring UAV,which are caused by the loss of communication and forced landing.How to effectively track the water conservancy mapping UAV has become a research topic.In view of this,this paper proposes a grid-based tracking method.The three-dimensional grid of the space is divided.The target grid is locked based on the spatial information scanned by radar.Driving the camera to collect UAV images.Image recognition and radar information are fused to realize UAV recognition and tracking.In this paper,three-dimensional mesh space division algorithm,mesh mapping algorithm,UAV identification algorithm,tracking and monitoring algorithms are described in detail.Experimental results show that this technique has advantages in fast capture,effective lock,tracking and surveillance of water conservancy mapping UAV.

Key words: Grid, Water conservancy mapping, UAV, Image recognition, Tracking and monitoring