GPS现代化后L_2载波的定位精度研究

Accuracy Analysis of L_2 C Code of Dual Frequency GPS Receiver

摘要: 利用实际采集的数据,从信噪比和定位残差上分析了L2载波的数据质量,指出GPS现代化后,用L2C码恢复的L2载波信噪比明显提高,与L1载波信噪比接近,两者的差值仅在5 dBHz以内;用L2C码恢复的L2载波比GPS现代化前的L2载波的信噪比更加稳定,不容易受卫星高度角的影响;同时利用L2C码恢复的L2载波的定位残差比没有L2C码的L2载波小,定位精度明显提高。

Abstract: Using the actual data collection,the quality of L2 carrier phase is analyzed in two respects,which are SNR and the positioning residual error.Some conclusions are given.Firstly,the SNR of L2 carrier phase resumed by L2 C code is improved obviously,almost close to the SNR of L1 carrier,with a difference of less than 5 dBHz.Secondly,it has a more stable SNR than that obtained before GPS modernization.Meanwhile,the positioning residual error is smaller than L2 carrier phase without L2 C code,which can significantly improve positioning accuracy.