Quantifying uncertainty in bicycle-computer position measurements MEA Forensic Engineers and Scientists

Format:

Book

Conference/Event

Author/Creator:

Siegmund, Gunter P., author.

Contributor:

Booth, Gabrielle

Lawrence, Jonathan M.

Miller, Ian L.

Conference Name:

WCX SAE World Congress Experience (2024-04-16 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2024

Summary:

Bicycle computers record and store global position data that can be useful for forensic investigations. The goal of this study was to estimate the absolute error of the latitude and longitude positions recorded by a common bicycle computer over a wide range of riding conditions. We installed three Garmin Edge 530 computers on the handlebars of a bicycle and acquired 9 hours of static data and 96 hours (2214 km) of dynamic data using three different navigation modes (GPS, GPS+GLONASS, and GPS+Galileo satellite systems) and two geographic locations (Vancouver, BC, Canada and Orange County, CA, USA). We used the principle of error propagation to calculate the absolute error of this device from the relative errors between the three pairs of computers. During the static tests, we found 16 m to 108 m of drift during the first 4 min and 1.4 m to 5.0 m of drift during a subsequent 8 min period. During the dynamic tests, we found a 95th percentile absolute error for this device of ±8.04 m. This error was mildly sensitive to the navigation system being used (GPS+Galileo had slightly smaller errors) and more sensitive to the geographic location where the data were acquired (BC errors were larger than CA errors). An absolute error of ±8.04 m is relatively large and limits a forensic investigator's ability to precisely locate a bicycle within a crash scene based solely on data from this device

Notes:

Vendor supplied data

Publisher Number:

2024-01-2486

Access Restriction:

Restricted for use by site license