Analysis And Simulation Of The Impact Of Satellite Platform Vibration And Orbit Forecast Errors On Intersatellite Link Acquisition

In the satellite communication system,the acquisition technology is a necessary prerequisite for establishing a link between two satellite terminals to achieve communication,and the function of establishing a link for the first communication between different satellite terminals is achieved.Therefore,the acquisition technology is essential for satellite communication.The acquisition process is to continuously adjust the visual axis of the two satellite communication terminals,and finally achieve mutual alignment between the two terminals.Normally,the link time is limited.In order to transmit more information as soon as possible,the time to complete the capture should be minimized.In space,the acquisition of inter-satellite links is affected by the vibration of satellite platforms and satellite orbit forecast errors,so it is very meaningful to optimize the acquisition technology.Based on the background requirements of this subject,this paper expands the analysis and research of the impact of satellite platform vibration and orbit prediction errors on the acquisition of inter-satellite links.Firstly,based on the vibration conditions of the satellite platform,the inter-satellite link acquisition technology is studied.The effects of the satellite platform vibration on the scanning acquisition uncertainty area and the scan step are analyzed and discussed.Then,single-field and multi-field scans are derived and analyzed separately.Based on the corresponding acquisition success probability and the average acquisition time of multifield scanning,two scanning strategies of step scan acquisition and fast scan acquisition were established,and the time interval and timing diagram under different scanning strategies were analyzed respectively.Then the analysis and simulation of the inter-satellite motion trajectory,the orbit prediction error will affect the inter-satellite motion trajectory and thus the acquisition performance.The validity of the set uncertain scanning area,the reliability of the capture technology and the feasibility of the capture scheme are verified.The related basic knowledge of the satellite orbit parameters and the reading rules of the two planetary calendars of the satellite orbit are introduced.The source was analyzed.Then,in order to simulate a more realistic space capture environment,MATLAB and STK analyze the movement trajectory between the two satellite terminals,and investigate the influence of the relative movement between the satellite terminals on the satellite communication inter-satellite link acquisition.The influence of single track root number error and multivariable track root number error on the acquisition performance is analyzed under the set acquisition scheme.Finally,the simulation analysis of the capture performance under the vibration conditions of the satellite platform.First of all,the specific modeling and analysis of the scanning method under the condition of considering the vibration of the satellite platform.On the premise of ensuring the probability of capture,optimize the research of the capture technology to minimize the number of captures Shorten the capture time.The capture time is related to various factors such as the scanning uncertainty area,the scan step,the communication distance,and the bandwidth of the execution device.Choosing the corresponding capture strategy needs to shorten the capture time according to the impact of important system parameters on the capture time.Under the random vibration environment of the satellite,the influence of each main parameter of the system on the average acquisition time is studied,the optimal scanning uncertainty area is derived,and finally the Monte Carlo test method is used to verify the rationality of the acquisition model.