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 Enhancing GPS Accuracy and Security using DSRC



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We propose a novel way of using the Dedicated Short Range Communication(DSRC)
spectrum to enhance the accuracy and security of GPS.Traditionally the DSRC
spectrum is designed to carry information such as the location estimates of the
vehicles provided by GPS that are assumed to be accurate.However the accuracy of
GPS is severely affected by environmental factors like multipath and adverse factors
like intentional jamming and spoofing by malicious users.We ask the question of
whether DSRC communication could in fact be exploited to enhance the position
accuracy and security of GPS.Many safety and mobility applications as envisioned
by the Federal Highway Authority(FHWA) for Intelligent Transportation System
(ITS) applications,mandate sub-meter or higher accuracies that is not delivered
by the GPS system.Department of Transportation(DoT)’s and other agencies are
actively involved in exploring technologies such as NRTK,DGPS to provide a high
accuracy location service for ITS applications.The cost of implementation and
maintenance of these systems are expensive and further are not robust to multipath
interference and malicious attacks.Our proposed solution aims to enhance the
accuracy and security of GPS through collaboration between vehicles using DSRC.By
exploiting the diversity in the DSRC measurements and using consistency checks,
we aim to discard the bad measurements and obtain highly precise position
estimates.The system can complement existing technologies such as NRTK to
provide a robust,precise and secure location service for the benefit of ITS and other
applications that mandate high accuracy positioning.