Research in Progress (RIP) https://rip.trb.org/ en-us Copyright © 2026. National Academy of Sciences. All rights reserved. http://blogs.law.harvard.edu/tech/rss tris-trb@nas.edu (Bill McLeod) tris-trb@nas.edu (Bill McLeod) Research in Progress (RIP) https://rip.trb.org/Images/PageHeader-wTitle-RIP.jpg https://rip.trb.org/ Ensuring PNT Resiience https://rip.trb.org/View/2676001 Mon, 02 Mar 2026 19:15:21 GMT https://rip.trb.org/View/2676001 Rapid Detection of Track Changes from In-Motion Data Acquisition Records: Lab Setup and Field Implementation – Year 3 https://rip.trb.org/View/2573191 Mon, 14 Jul 2025 20:04:39 GMT https://rip.trb.org/View/2573191 Towards GNSS-less Navigation: Exploiting Terrestrial and LEO Satellite Signals of Opportunity https://rip.trb.org/View/2321512 Thu, 11 Jan 2024 16:07:04 GMT https://rip.trb.org/View/2321512 Assisting Vision-Impaired Pedestrians to Cross Streets: An Innovative Accoustic Ranging Approach https://rip.trb.org/View/1635493 Thu, 04 Jul 2019 10:30:50 GMT https://rip.trb.org/View/1635493