Performance Analysis of Carrier Loop on the Deep Coupling of Low Cost INS/GNSS
【摘要】：The application for GNSS (Global Navigation Satellite System) receiver is restricted due to the frangibility of carrier loop framework. The deep coupling of INS (Inertial Navigation System) and GNSS can improve the robustness of GNSS receiver as an important solution. Based on the framework of deep coupling, critical factors of impacting carrier tracking and their interrelations are analyzed. The validation results show inexpensive automotive grade INS via the optimized filter design can remove dynamic uncertainty stress error of Doppler and reduce the bandwidth of loop evidently, when the stability of crystal oscillator is critical component of affecting performance, loop is out of locking because of ultra-low bandwidth. The reliable and handy way of loop bandwidth optimization with linear prolongation is proposed to make loop track signal of the different CNR (Carrier Noise Ratio) accurately and rapidly in the field of project realization finally.