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Mapping GPS Satellite Signal Visibil...

Zeller, Emma F.

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Mapping GPS Satellite Signal Visibility, Specularity, and Multipath for Improved Urban Navigation.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Mapping GPS Satellite Signal Visibility, Specularity, and Multipath for Improved Urban Navigation./
Author:	Zeller, Emma F.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
Description:	79 p.
Notes:	Source: Masters Abstracts International, Volume: 85-04.
Contained By:	Masters Abstracts International85-04.
Subject:	Aerospace engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30570120
ISBN:	9798380598439

Mapping GPS Satellite Signal Visibility, Specularity, and Multipath for Improved Urban Navigation.
Zeller, Emma F.

Mapping GPS Satellite Signal Visibility, Specularity, and Multipath for Improved Urban Navigation. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 79 p.

Source: Masters Abstracts International, Volume: 85-04.

Thesis (M.S.)--University of Minnesota, 2023.

This item must not be sold to any third party vendors.

GPS has been a key positioning tool since it was first introduced, and improved space and control segments have led users to expect accurate positioning. However, there are still uncertainties and errors in the user segment that can't be fully accounted for upfront due to challenges specific to each user. GPS positioning in urban environments is challenging as tall buildings often block, reflect, or diffract signals. When signals reflect off buildings or other surfaces they reach the receiver via a non-line-of-sight (NLOS) path. Multipath is a phenomenon that occurs when a signal from a single satellite reaches the receiver via both a direct-line-of-sight (DLOS) and NLOS path. When a strong reflected signal reaches the receiver at a delay less than ~300m relative to the direct path signal, the interference due to the combination of both signals causes errors in the computed position solution. Many techniques in conventional software defined radios (SDRs) equipped to detect multipath attempt to mitigate the resulting errors by removing the NLOS component or the entire signal. However, very few approaches attempt to utilize both the DLOS and NLOS signals as additional measurements to aid in positioning. The approach discussed in this work uses urban mapping to predict visibility and specularity at any location of interest within the mapped environment, as well as the Multipath Estimating Delay Lock Loop (MEDLL) to characterize multipath signals. These are then incorporated into Direct Position Estimation (DPE), an alternative positioning approach that directly computes a multi-dimensional spatial correlogram from the individual satellite correlations, rather than individually tracking each to get a navigation solution. Experimental data from both a stationary and driving experiment done in Denver, CO are used to test the different methods. When positioning results using DPE integrating visibility and specularity predictions from both urban mapping and MEDLL are compared to standard SDR positioning, improvements are seen.

ISBN: 9798380598439Subjects--Topical Terms:

1002622
Aerospace engineering.
Subjects--Index Terms:

Direct Position Estimation

Mapping GPS Satellite Signal Visibility, Specularity, and Multipath for Improved Urban Navigation.
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245 1 0 $a Mapping GPS Satellite Signal Visibility, Specularity, and Multipath for Improved Urban Navigation.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2023
300 $a 79 p.
500 $a Source: Masters Abstracts International, Volume: 85-04.
500 $a Advisor: Strandjord, Kirsten.
502 $a Thesis (M.S.)--University of Minnesota, 2023.
506 $a This item must not be sold to any third party vendors.
520 $a GPS has been a key positioning tool since it was first introduced, and improved space and control segments have led users to expect accurate positioning. However, there are still uncertainties and errors in the user segment that can't be fully accounted for upfront due to challenges specific to each user. GPS positioning in urban environments is challenging as tall buildings often block, reflect, or diffract signals. When signals reflect off buildings or other surfaces they reach the receiver via a non-line-of-sight (NLOS) path. Multipath is a phenomenon that occurs when a signal from a single satellite reaches the receiver via both a direct-line-of-sight (DLOS) and NLOS path. When a strong reflected signal reaches the receiver at a delay less than ~300m relative to the direct path signal, the interference due to the combination of both signals causes errors in the computed position solution. Many techniques in conventional software defined radios (SDRs) equipped to detect multipath attempt to mitigate the resulting errors by removing the NLOS component or the entire signal. However, very few approaches attempt to utilize both the DLOS and NLOS signals as additional measurements to aid in positioning. The approach discussed in this work uses urban mapping to predict visibility and specularity at any location of interest within the mapped environment, as well as the Multipath Estimating Delay Lock Loop (MEDLL) to characterize multipath signals. These are then incorporated into Direct Position Estimation (DPE), an alternative positioning approach that directly computes a multi-dimensional spatial correlogram from the individual satellite correlations, rather than individually tracking each to get a navigation solution. Experimental data from both a stationary and driving experiment done in Denver, CO are used to test the different methods. When positioning results using DPE integrating visibility and specularity predictions from both urban mapping and MEDLL are compared to standard SDR positioning, improvements are seen.
590 $a School code: 0130.
650 4 $a Aerospace engineering. $3 1002622
650 4 $a Remote sensing. $3 535394
653 $a Direct Position Estimation
653 $a Navigation
653 $a Urban environments
653 $a Key positioning
653 $a Software defined radios
690 $a 0538
690 $a 0799
710 2 $a University of Minnesota. $b Aerospace Engineering and Mechanics. $3 1681609
773 0 $t Masters Abstracts International $g 85-04.
790 $a 0130
791 $a M.S.
792 $a 2023
793 $a English
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