eprintid: 1394467
rev_number: 47
eprint_status: archive
userid: 608
dir: disk0/01/39/44/67
datestamp: 2013-05-29 18:53:40
lastmod: 2021-12-13 02:55:52
status_changed: 2013-07-25 09:51:32
type: proceedings_section
metadata_visibility: show
item_issues_count: 0
creators_name: Hsu, LT
creators_name: Groves, PD
creators_name: Jan, SS
title: Assessment of the Multipath Mitigation Effect of Vector Tracking in an Urban Environment
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F44
note: © 2013 The Authors and The Institute of Navigation
abstract: Today, smart mobiles play an important role in our daily life. Most of these devices are equipped with a navigation function based on GNSS positioning. However, these devices may not work accurately in urban environments due to severe multipath interference and non-line of sight (NLOS) reception caused by nearby buildings. A promising approach for reducing the effect of multipath interference and NLOS reception is vector tracking (VT). VT is well-known for its robustness against poor signal-to-noise levels. However, its capability against multipath and NLOS has yet to be determined. The new combination of this paper is therefore to evaluate the performance of vector tracking in the presence of multipath and NLOS effects. A vector delay lock loop (VDLL) is used as the vector tracking technique. The noise tuning of the extended Kalman filter (EKF) in vector tracking is a key factor affecting its performance. Therefore, developed an adaptive noise tuning algorithm had been based on the measurement innovation. In order to evaluate vector tracking’s performance, equivalent conventional tracking loops are used as a control. GNSS signals were collected, while walking around in a challenging urban environment subject to multipath interference. The experimental results show that VT generates a more stable code numerical-controlled oscillator (NCO) frequency than CT does. This characteristic could reduce the impact of multipath interference which is reflected in a smaller position error using VT during most of run. To further test capability of VT against signal attenuation, this paper applies a signal cancellation method called direct signal cancellation algorithm to simulate the scenario of signal termination and NLOS reception. According to the simulation, VT provides not only robustness against signal termination but can also detect NLOS reception without any external aiding.
date: 2013-04-25
publisher: Institute of Navigation Publications
official_url: http://www.ion.org/publications/abstract.cfm?jp=p&articleID=11007
vfaculties: VENG
oa_status: green
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_source: Manually entered
elements_id: 872658
lyricists_name: Groves, Paul
lyricists_id: PDGRO34
full_text_status: public
place_of_pub: Honolulu, Hawaii
event_title: ION Pacific PNT
event_location: Honolulu, HA
event_dates: 2013-04-22 - 2013-04-25
book_title: Proceedings of the ION 2013 Pacific PNT Meeting
citation:        Hsu, LT;    Groves, PD;    Jan, SS;      (2013)    Assessment of the Multipath Mitigation Effect of Vector Tracking in an Urban Environment.                     In:  Proceedings of the ION 2013 Pacific PNT Meeting.    Institute of Navigation Publications: Honolulu, Hawaii.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1394467/1/ION%20Pacific%20PNT%2013.pdf