DBF-NELT: A novel unambiguous tracking technique for Galileo E1 signal
BOC(m,n) modulation is now widely adopted in secondary Global Navigation Satellite System(GNSS) signals. The new generation modulation is equipped with greater multipath mitigation and anti-jamming performance than traditional BPSK modulation. However, the autocorrelation function multi-peaks of BOC(m,n) signals induce serious tracking errors for GNSS receiver design. This article presents a novel method nominated DBF-NELT to overcome the problem. The simulation to process Galileo E1 signals proves that the thermal performance of DBF-NELT outperforms conventional unambiguous tracking methods. Moreover, the code loop discriminator is improved by a look-up table which is more linear in pull-in range.