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NCJRS Abstract

The document referenced below is part of the NCJRS Library collection. To conduct further searches of the collection, visit the NCJRS Abstracts Database. See the Obtain Documents page for direction on how to access resources online, via mail, through interlibrary loans, or in a local library.

 
  NCJ Number: NCJ 241274     Find in a Library
  Title: UWB Enhanced Time Difference of Arrival System, Final Report
  Document URL: PDF 
  Author(s): Benjamin Lonske ; Eric van Doorn ; Satya Ponnaluri ; Arvind Bhat
  Date Published: 2012
  Page Count: 32
  Annotation: The objective of this study is to develop a technology that can partially address the detection and location of cell phone use in correctional institutions and possibly other settings, such as texting in motor vehicles.
  Abstract: The authors report the development of a high-performance system capable of locating CDMA2000 cell phones using time difference-of-arrival techniques. Using simulated CDMA2000 data, cell-phone location testing was favorable, even at low signal-to-noise ratios. Cell phone use was located within one or two prison cells in a prison setting. Preliminary testing was done with the receiving hardware built during the performance period. Tests have been performed with both a flip phone (LG VX5500) and with a cellular modem (MultiTech MTCBA-C1); both used the CDMA2000 cellular protocol over the Verizon network. The cellular modem has a SMA connector, which allows for direct wired hook-up to the hardware. This is useful for controlled testing and for calibrating differences in cable length. In preliminary tests, all inputs were terminated and data collected to measure the noise floor. Then, four 164-foot RG-400 cables were attached to the modem via a four-way splitter and 60 dB attenuator to verify that the signals were being received correctly and to calibrate small differences in cable length. Next, the modem was replaced with one antenna to test the reception of signals through air. Finally, antennas were connected to the ends of each of the four cables and extended 30-60 feet away, and data were collected to determine the sensitivity of the energy-detection algorithm. 45 figures and 5 tables
  Main Term(s): Forensics/Forensic Sciences
  Index Term(s): Telephone communications ; Inmate organizations ; Telephone equipment ; Technology transfer ; Mobile digital communications ; Inmate misconduct ; NIJ final report ; NIJ grant-related documents
  Sponsoring Agency: National Institute of Justice (NIJ)
US Department of Justice
Office of Justice Programs
United States of America
  Grant Number: 2007-RG-CX-K179
  Sale Source: NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America
  Type: Report (Study/Research)
  Country: United States of America
  Language: English
   
  To cite this abstract, use the following link:
https://www.ncjrs.gov/App/Publications/abstract.aspx?ID=263364

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