Attitude High Dynamic Bei Dou Receiver Tracking Loop Design And Implementation

With the development of satellite navigation industry, the applications area is expanding, and the navigation service performance provided by satellite navigation is also rising, which makes the global navigation system become a global economic industry. Precision-guided missiles as a kind of typical users, it has a certain degree of particularity, the reason is that in the flight of missiles projectile are often in a state of rotation, which brings new challenges to the receiver tracking loop.Firstly, the structure characteristics of BDS( BeiDou Navigation Satellite System) signals and the system structure of receiver system is analyzed, and the receiver modules for signal processing method is described. The advantages and disadvantages of each loop discriminator algorithm, the loop filter design methods and calculation formula of loop parameters are elaborated. Then modeling analysis was carried out on the satellite signals under missile projectile rotating conditions, and the formula was deduced carrier Doppler and carrier phase change law as well as the expression of the received of the received signal. Then the traditional receiver tracking loop is realized as a preparation for this topic. Secondly in the high dynamic environment the missiles spin effect on the receiver tracking loop is analyzed, and combined with theoretical analysis, then a improvement project of the loop is put forward —— resistance to rotation in the main demodulation scheme. The simulation result prove that the new loop has better performance than traditional loop, and it can effectively reduce the influence of carrier rotating track of loop. Finally, the software receiver algorithm is used for real time optimization.