Open AccessGNSS multipath suppression technology based on postcorrelation and independent component analysis
Author(s) -
Jian Xu,
Jianguo Ding
Publication year - 2022
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0267216
Subject(s) - gnss applications , multipath propagation , computer science , multipath mitigation , multipath interference , satellite system , beamforming , interference (communication) , satellite navigation , carrier to noise ratio , electronic engineering , noise (video) , telecommunications , real time computing , global positioning system , signal to noise ratio (imaging) , engineering , artificial intelligence , channel (broadcasting) , image (mathematics)
In urban and other complex environments, satellite navigation signals are vulnerable to multipath interference, especially medium- and short-delay multipath interference, which seriously affects the positioning accuracy. Aiming at the problem that the effect of traditional methods on medium and short multipath suppression is not obvious and it is difficult to accurately estimate the direction of arrival (DOA) when beamforming is used, a multipath suppression scheme based on a postcorrelation and independent component analysis (ICA) algorithm is proposed in this paper. First, the satellite navigation signal on each array element is despread and demodulated by postcorrelation technology to improve the signal-to-noise ratio (SNR), and then the direct signal component is directly extracted by the ICA algorithm to filter the noise while suppressing the multipath interference. Simulation results show that this method can effectively suppress medium and short multipath interference when the SNR of satellite navigation signals is as low as -30 dB, significantly improve the SNR of navigation messages and reduce the bit error rate, which provides a new solution for global navigation satellite system (GNSS) multipath suppression.