Research And Application Of Fruit Recognition Algorithms Based On Deep Convolutional Neural Network

In recent years,with the rapid development of aviation technology,UAV technology has attracted the attention of many scholars at home and abroad because of its high maneuverability and flexibility.Originally used in the military,UAVs are now increasingly used in many fields such as real-time monitoring,geological aerial photography,emergency rescue and disaster relief.With the complexity of battlefield environment and civil scene,UAV AD hoc network formed by multi-UAV cluster self-organization has stronger maneuverability and can cooperate in combat,which has become one of the key research objects of UAV research at home and abroad.However,in various emergency communication scenarios,the topology of UAV AD hoc network changes rapidly and the reliability is poor,especially the requirement of low time ductility is very high.OLSR(Optimized Link State Routing),the typical representative of the existing prior routing protocol,is optimized for low delay,but delay must be reduced to improve reliability in scenarios with frequent topology changes and fast node speeds.Based on OLSR protocol,this paper studies the low-time ductility of the communication protocol in AD hoc network of UAVs.The main research contents are as follows.1)In the scenario where the network topology changes frequently,link interruption is easy to cause communication failure,packet loss,and thus high communication delay,the TC message routing mechanism is added.When the multi-hop link is interrupted,TC addressing request messages are used to find the way in time.When the destination node or intermediate node contains the routing information of the destination address,it will return immediately.To improve the link maintenance mechanism and reduce the data retransmission delay.2)In order to solve the problem that nodes cannot communicate with each other when they enter the network due to lack of routing information,the HELLO message neighbor addressing mechanism is proposed.When nodes enter the network and need to communicate,the HELLO message is used to carry the destination node and search the routing information of the destination node in the local routing table of the neighboring node,so as to carry out communication and reduce the communication delay when nodes enter the network.Meanwhile,the interval for sending HELLO messages is optimized to improve network utilization efficiency.3)The shortest path algorithm is improved to add alternative paths on the basis of the original routing algorithm,so as to improve the success rate of data transmission and reduce the total delay.In this paper,the effectiveness of low-delay improved OLSR protocol is analyzed theoretically.The simulation results show that compared with OLSR protocol,the improved protocol can improve the success rate of packet sending and reduce the end-to-end delay.