conference paper
published journal article
conference paper
A framework for simultaneously tracking Orbcomm low Earth orbit (LEO) satellites and using Doppler measurements drawn from their signals to aid a vehicle’s inertial navigation system (INS) is developed. The developed framework enables a navigating vehicle to exploit ambient Orbcomm LEO satellite signal Doppler measurements to aid its INS in a tightly-coupled fashion in the event global navigation satellite system (GNSS) signals become unusable. An overview of the extended Kalman filter-based simultaneous tracking and navigation (STAN) framework is provided. Experimental results are presented showing an unmanned aerial vehicle (UAV) aiding its INS with Doppler measurements drawn from two Orbcomm LEO satellites, reducing the final position error from 31.7 m to 8.9 m after 30 seconds of GNSS unavailability.
conference paper
book/book chapter
In order to address some of the most pressing problems of the twenty-first century, such as climate change and income inequality, land-use law must facilitate residential infill development – the construction of new housing and supportive infrastructure in areas with significant existing development. Planning and zoning have often been used to thwart infill development and foster urban sprawl, and this chapter explores their role in promoting infill development. It first describes the relationship between land-use planning and zoning in the US, and then discusses different scales of planning (i.e., local and regional). It then illustrates potential avenues for research on shifts in land-use law to promote infill development, with examples from the substantive domains of transportation planning and housing planning.
published journal article
published journal article
published journal article
conference paper
Estimation of intersection turning movements is one of the key inputs required for a variety of transportation analysis, including intersection geometric design, signal timing design, traffic impact assessment, and transportation planning. Conventional approaches that use manual techniques for estimation of turning movements are insensitive to congestion. The drawbacks of the manual techniques can be amended by integrating a network traffic model with a computation procedure capable of estimating turning movements from a set of link traffic counts. This study proposes using the Path Flow Estimator (PFE), originally used to estimate path flows (hence origin-destination flows), to derive not only complete link flows, but also turning movements for the whole road network given some counts at selected roads. Two case studies using actual traffic counts are used to demonstrate the proposed intersection turning movement estimation procedure.
published journal article