MEDLL On-Strobe Correlator: A Combined Anti-multipath Technique for GNSS Signal Tracking. (11th May 2020)

• Record Type: Journal Article
• Authors: Wang, Yiwei; Huang, Zhigang
• Is Part Of: Journal of navigation. Volume 73:Number 3(2020)
• Page Start: 658
• Page End: 677
• Publication Date: 2020-05-11
• Subjects: GNSS, -- MEDLL, -- Strobe Correlator, -- Anti-multipath; Navigation -- Periodicals; 623.8905
• DOI: 10.1017/S0373463319000870
• Languages: English
• ISSNs: 0373-4633

Abstract

Abstract : To reduce the operational complexity of the multipath estimating delay lock loop (MEDLL) and improve its anti-multipath performance for strobe correlators, a combination anti-multipath scheme, namely, the MEDLL on-strobe correlation technique, is proposed for global navigation satellite system (GNSS) signal processing. Short-delay multipath rays are separated from the strobe correlation function by the MEDLL mechanism; the dot product between the estimation residue and the standard correlation function or the BOC-PRN correlation function is then computed to eliminate the potential tracking ambiguity. Finally, this non-coherent combination result is sent to the loop filter to obtain anti-multipath code tracking. The proposed method is analysed via simulator data with a software receiver under different front-end bandwidth conditions. The results corroborate the better multipath mitigation capability and lower computational burden, although it is still difficult to eliminate all multipath interference, especially when the front-end bandwidth is insufficient.