Research On Enhancement Tracking Technique Of BD Signals In High Dynamic Applications

With the unique advantages in the field of navigation and positioning,Beidou system provides high precision and continuous position,posture and timing information to the asia-pacific region.And with the global layout of beidou satellite,its service scope will gradually expand to global users.The application field of beidou satellite receiver is expanding,the using environment is more and more complex and the demand is increasing,the beidou receiver technology is facing new opportunities and challenges.In the defense field,the dynamic of missiles and supersonic aircrafts is getting higher enough,which makes the receiving satellite signals contain large doppler frequency shift and doppler shift rate.In order to keep tracking,traditional Beidou receiver has to enlarge its tracking loop bandwidth,but its means that too much noise is introduced into the loop,and tracking precision decreased.Considering the contradiction between the receiver dynamic adaptability and tracking precision under the high dynamic conditions,a new carrier tracking loop structure and algorithm of beidou receiver are designed.There are two improved algorithms proposed which can solve the contradiction between dynamic adaptability and tracking accuracy from different angles.First of all,the tracking loop structure of traditional receiver is analyzed in this paper,and the problems of traditional receiver tracking loop in high dynamic environment are studied.Two kinds of Receiver Tracking enhancement schemes are proposed ender the scene of dynamic switching and high dynamic,two typical application scenarios.Secondly,considering the bandwidth and order are two main factors of the tracking loop,the paper designed the adaptive adjustment of the tracking loop structure and parameters.Firstly,steady-state response of different loop order is investigated.Then the main error that affects the tracking performance is deduced.On the basis of the above research,the adaptive adjustment module is designed.The performance of the improved tracking loop is compared and analyzed with the conventional receiver,and the theoretical basis is provided that the improved algorithm improve its tracking performance without introducing any external information.Then,considering BDs receiver with adjusting bandwidth and order can not stably track in a high dynamic scenario,a carrier enhancement algorithm based on inertial information aided is designed.Firstly,the additional errors to the tracking loop which is introduced by INS aided are analyzed.Then the necessity of introducing INS aided information is analyzed.On this basis,the structure and algorithm of the tracking loop based on PLL/INS adaptive switching are proposed.Finally,the improved algorithm is compared with the conventional receiver which is verified the effectiveness of the proposed algorithm.In order to analyze the tracking and positioning performance of tracking scheme in chapters 3 and 4 is designed for tracking effect of the promotion role and positioning performance,the enhanced beidou carrier tracking loop simulation platform is designed.The simulation platform achieves the signal simulation of high dynamic carrier through signal simulation sub-platform,and the navigation and error analysis process is completed through the receiver performance verification sub-platform.The platform forms a complete closed loop from signal generation to receiver navigation solution to error analysis.The paper,provides a good reference on the process of design,development and performance optimization of beidou receiver.It has guiding effect for the development of hardware platform,and it has good engineering application value.The research of this paper provides a better reference scheme for the design,development and optimization of Beidou receiver,and has a good reference value for engineering applications.