Time Delay of Arrival Location Assessment Using Four Satellites.

Abstract

The Time of Arrival (TOA)/Time Delay of Arrival (TDOA) concepts for locating a source are reviewed. The Vela satellite program and how they used in conjunction with the TOA concept is discussed. NAVSTAR/GPS is reviewed next and how this interrelates with the other concepts discussed is mentioned. The last concept mentioned is that of nuclear detection. Again, examples on how this idea interrelates with the previous mentioned concepts are shown. The problem addressed here is to develop mathematical formulas that describe the problem of having four satellites viewing an event. The first method uses a TOA technique to solve for the event's location and time. The second method employs the solution from the first method to predict uncertainty in location and time. Also this uncertainty is determined through the use of implicit differentiation. These results are then compared with the projected difference from the standard solution when the associated value is varied by an equivalent amount, in the first method. Results from one example are discussed. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1984
Accession Number
ADA159243

Entities

People

  • C. M. Wozniakowski

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Sensors
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Algorithms
  • Artificial Satellites
  • Computer Programs
  • Coordinate Systems
  • Detection
  • Detectors
  • Equations
  • Geometry
  • Global Positioning Systems
  • Inertial Navigation
  • Navigation
  • Nuclear Explosions
  • Satellite Constellations
  • Space Systems
  • Spacecraft
  • Standards
  • Statistical Analysis

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Positioning, Navigation, and Timing (PNT) Technology.
  • Seismology

Technology Areas

  • Space