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Dual polarization beamforming algorithm for multipath mitigation in {GNSS}
- Publication Year :
- 2017
-
Abstract
- A multipath mitigation technique for GNSS is proposed.The technique exploites the change of polarization when a signal is reflected.A novel statistic based on the outputs of a correlator bank is introduced to estimate the multipath DoA and polarization.Applying the technique increases the estimation performance in the case of highly temporally or spatially correlated multipath and line-of-sight signal. This paper treats the problem of line-of-sight (LOS) parameter estimation in strong multipath environments. In the case of highly temporally and spatially correlated LOS and multipath signals, such as urban canyons, common multipath mitigation methods are highly degraded, as signal separation cannot be performed in the spatio temporal domain. In this case, we exploit the LOS and multipath polarization diversity to decouple the signals using an antenna array with right-hand-circular polarization (RHCP) and left-hand-circular polarization (LHCP) feeds. The multipath direction- of-arrival (DOA) and polarization coefficients can effectively be estimated from the LHCP spatial covariance matrix. The LOS DOA can be estimated from the RHCP spatial covariance matrix. The spatial covariance matrices are calculated from the outputs of a matched correlator bank. The DOA and polarization estimates are used to implement a dual polarization beamformer, which maximizes the LOS energy and suppresses multipath energy over both polarizations. The LOS time-delay is estimated from the beamformer output with a maximum-likelihood estimator with a significantly reduced number of parameters and computational complexity in comparison to a full model estimator. Simulation results for GPS show that the proposed dual polarization beamforming algorithm performs better than an equivalent single-polarization beamformer in a dense multipath environment.
- Subjects :
- 020301 aerospace & aeronautics
Spatial correlation
Multipath mitigation
Spatial filtering
Covariance function
Computer science
Estimation theory
Estimator
020206 networking & telecommunications
02 engineering and technology
Delay spread
Antenna array
0203 mechanical engineering
Control and Systems Engineering
Signal Processing
Computer Science::Networking and Internet Architecture
0202 electrical engineering, electronic engineering, information engineering
Electronic engineering
Rake receiver
Computer Vision and Pattern Recognition
Electrical and Electronic Engineering
Software
Multipath propagation
Computer Science::Information Theory
Subjects
Details
- Language :
- German
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....497631a4743bbe417d39af762fad934d