| As research on satellite navigation applications further in-depth,the working environment of the receiver becomes increasingly complex.The requirement of receiver performance is further improved.For military applications,complex battlefield environment,especially in the jungle and street fighting,navigation signal attenuation is serious.For daily use,the urban neighborhoods of skyscrapers,a variety of signal interleaving will makes signal attenuation.Enhanced receiver tracking performance in harsh environments,improve navigation receivers in the continuity and stability of complex environments,it has become a hot area of research navigation.(1)In this paper,the performance evaluation index is analyzed,and the performance of the performance evaluation index is redefined.Expand the scope of use of the traditional tracking performance evaluation index.(2)This paper give a detailed analysis on the performance of the vector delay locked loop(VDLL)Compared to the traditional method which channels are independent and waste tracking resources,"VDLL" algorithm can fully tap the relevant information between the channels and effectively improve the pseudo-code tracking sensitivity.However,because of its carriers still use the traditional tracking method.But the overall tracking performance is still limited.and because the channel coupled to each other,there is a code tracking error,and locate solver has a larger error.(3)VDLL will introduce the code tracking error This paper tries to use vector frequency lock loop(VFLL)to track the carrier aided traditional code tracking loop(SDLL),which can improve the carrier tracking performance,and can avoid the code tracking error.Through simulation and verification,the structure of the “SDLL+VFLL” is effectively improved the sensitivity,accuracy and stability of the carrier tracking,and the structure of the auxiliary ring is also guaranteed.By comparing the performance of the tracking method listed in this paper. |
