Research On Low Altitude Radio Monitoring And Positioning System Based On Multi-rotor UAV

In the past decade years,the development of China's civil aviation industry and electronic products has accelerates rapidly.The civil aviation air traffic command communication method is mainly VHF communication.VHF communication is susceptible to interference.The problems of civil aviation VHF interference investigation and in-use channel spectrum monitoring are particularly important and prominent.For further improve the effect of traditional civil aviation radio interference investigation,it is imperative to develop a new low-altitude radio monitoring system based on multi-rotor drones.The system has the advantages of simple operation,flexible movement,low price and precise positioning.First of all,this article analyzes theoretically the benefits of the multi-rotor UAV system after being lifted off.The basic working principle and hardware composition of the system hardware platform are described.Through the selection of the drone,the selection of the receiver,the selection of the wireless data transmission and the communication module,and the test analysis,using the test results to select the best hardware structure,determined the use of Smart Eagle-15 hybrid oil-electric UAV,DRM100 receiver and JY-cw DLink point-to-point communication module.Then,this article describes the functional requirements of the software platform,interface framework,etc.of the multi-rotor UAV system in the subject,introduces the basic use methods and preliminary test results based on the multi-rotor UAV low-altitude radio monitoring and positioning software,and verifies the feasibility and practicability of the monitoring and positioning software.The test results show that the software can meet the requirements of the subject,laying a foundation for the subsequent development of positioning algorithm software.Next,in this two-dimensional plane,simulation experiments were carried out on direction-finding cross-location and RSSI positioning respectively,and the factors affecting the positioning accuracy were analyzed.Aiming at the problems of traditional single UAV passive positioning algorithm,an optimization model based on hybrid positioning method of direction finding cross and RSSI is proposed.After simulation analysis,the algorithm can achieve high-precision positioning.Finally this stage,many products are difficult to guarantee the accuracy of interference source positioning and moreover,and the traditional civil aviation radio interference investigation requirements are harsh.Combined with the above research,this paper believes that the cost of using this system in real time at this stage is lower and the accuracy can also be guaranteed.