Acquisition And Tracking Of Signals In Beidou Satellite Navigation Receivers

The satellite navigation system has been widely used in all walks of life since its invention.It has the characteristics of accurate positioning,globalization,miniaturization,etc.,which is an indispensable navigation positioning means in a country.The Beidou satellite navigation system which is developed by ourselves not only freed us from dependence on GPS and other national positioning systems,but also maintained national security.Therefore,the development of the Beidou navigation system is a path that our country must adhere to.The construction of the whole system in addition to the management and application of space satellites,the technological development and progress of Beidou satellite navigation receiver are also essential to the application of the whole Beidou system.The Beidou satellite navigation receiver is an integrated satellite transceiver equipment that has the functions of BD2/GPS two satellite navigation system positions and Beidou short message send and receive.It also has the anti-interference function of BD2_B3 frequency point and short message S frequency point.The development of a high-performance Beidou navigation receiver is an indispensable step in the effort to wean itself off dependence and improve national defense in the military and civilian field of our country.nevertheless,developing high performance of the Beidou satellite navigation receiver need to break through several technical difficulties of satellite navigation,which is particularly important for studying the algorithm and realization method at the beginning of the system.Through the analysis of the status of our Beidou satellite positioning system and its development trend,There are two main problems with the Beidou satellite navigation receiver in high dynamic environment.One is that a high-sensitivity fast capture algorithm is required to accommodate the receiver's capture index requirements of high sensitivity P.The second is to obtain a tracking algorithm which can stabilize the tracking signal in high dynamic condition to suit the high dynamic demand of the carrier.In order to solve the above problem,the paper based on the research of the key technologies of Beidou satellite navigation receiver put forward a kind of signal capturing and tracking algorithm which is suitable for our Beidou satellite navigation receiver.The method of matching filter and FFT frequency domain searching is proposed in the high sensitivity capture,It makes use of the characteristics of real-time of matched filtering in time domain and the characteristics of high sensitivity of FFT in frequency domain search,That ensure the receiver's characteristic of high sensitivity P code quick capture under the certain condition of the hardware resources.A method of combining a phase-lock loop with a locking ring in high dynamic tracking aspects is proposed,The paper combines the tracking precision of the phase-locked loop and the dynamic tracking capability of the lock ring,and realizes the stable tracking accuracy in high dynamic.Test and trial results show that the research of Beidou satellite navigation receiver signal capturing and tracking algorithm can not only effectively improve fast acquisition of the signal receiver in low carrier to noise ratio and high dynamic condition,but also improve the precision of signal's frequency and phase in high dynamic condition,It enables the performance metrics of the Beidou satellite navigation receiver to meet the user's requirements.In this paper,the research to develop higher performance of Beidou satellite navigation receiver laid the foundation,and accumulated development experience in the field of satellite navigation,make a certain contribution for our country satellite navigation.