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Performance Evaluation of Kalman Filter Based Tracking for the New GPS L5 Signal

The performances of several GPS L5 tracking implementations are evaluated using IF samples obtained with a hardware simulator. The aim of this study is to determine the loop structure and parameters that are most suited to accommodate the various design innovations, such as the data/pilot implementation or spreading sequence definition, inherent to the GPS L5 signal. In particular, the Kalman filter based strategy is compared to the constant loop bandwidth approach for both code and carrier tracking. The analysis is conducted in the presence of various tracking error sources including noise, receiver clock jitter and dynamics. Tracking performances are assessed in the tracking, measurement and position domains with particular attention on carrier tracking and carrier phase measurement accuracy for potential highaccuracy applications. Results show that, despite the improvements brought by the GPS L5 structure regarding the constant bandwidth approach, the Kalman filter based strategy remains very beneficial in terms of frequency tracking and carrier phase measurement accuracy.