Research On The Observation Trajectory Planning And Target Positioning Algorithm Of The UAV Reconnaissance System

Under the premise of high precision,high real-time and high concealment,the unmanned aerial vehicle is used to accurately locate the reconnaissance target,and to obtain the position coordinates of the reconnaissance target in the user coordinate system.With the constant development of science and technology,it is necessary to continuously improve the positioning accuracy of the reconnaissance targets on the battlefield,and to continuously increase the accuracy of the airborne equipment.Therefore,it is extremely important to find relevant parameters that affect the positioning accuracy of the reconnaissance target,improve the accuracy of the related measurement equipment,and continuously optimize the positioning model to reduce the positioning error of the target.With the GNSS,the real-time high-precision position of the drone is obtained.And the real-time angle,the image device of the drone and the angular position information of the image processing technology are measured by the inertial navigation system.This does not require the electromagnetic wave or laser on the reconnaissance target but passively locates static targets.This positioning method is concealed and may be applied in the future battlefield.In this paper,a passive reconnaissance scheme using UAV's image processing principle is proposed.Through the reasonable trajectory planning method of UAV,a target positioning model is established without measuring the distance,and the feasibility of the model is tested.Through the simulation experiment on Matlab,the cloud position map of the positioning position of the unmanned aerial vehicle with the positioning accuracy of the UAV and the measurement accuracy of the airborne angle device is obtained.The relationship between the trajectory parameters and the target positioning accuracy is also studied and the optimal flight radius and pitch value of the UAV flight are obtained.Because the single point cannot locate the reconnaissance target in the absence of the distance parameter,the scheme performs the optimal estimation of the target location by multi-point reconnaissance of the reconnaissance target to obtain the position coordinates of the target.The simulation analysis shows that the positioning accuracy of the reconnaissance target can reach 20 m under the condition that the current guidance GNSS positioning accuracy is 10 m and the inertial navigation system accuracy is 0.2°.At the same time,when reconnaissance is detected,the optimal flight radius of the drone is between 1500 m and 2000 m,and the optimal flight pitch is between 1700 m and 2500 m.This paper demonstrates the theoretical feasibility of passive location on the reconnaissance target,and prepares for future physical research.