Target localization over the Earth's curved surface


  1. Wong, S.
  2. Jassemi-Zargani, R.
  3. Brookes, D.
  4. Kim, B.
  5. Kaluzny, B.
Corporate Authors
Defence Research and Development Canada, Ottawa Research Centre, Ottawa ON (CAN);Defence Research and Development Canada, Centre for Operational Research and Analysis, Ottawa ON (CAN)
A procedure has been developed to enable target geolocation information to be processed from data collected over a wide surveillance area in which the effect of the Earth’s surface curvature is notable. The surveillance area of interest on the curved surface and its associated air space are transformed from the ellipsoidal (world geodetic) frame with coordinates given in latitude, longitude and altitude to an appropriate Cartesian frame with coordinates given by x, y, z. The Cartesian coordinate system permits a simpler three-dimensional model for processing of the target’s locations. It also allows a geometric approach to be used to solve the TDOA equations, using hyperboloids as solutions to the TDOA problem. The appeal of the geometric approach is its applicability in target geolocation processing using data collected from a minimum number of receivers deployed in a passive detection system as discussed in a previous study in [1]. Results have shown that the TDOA processing procedure developed in this study can provide proper target localization over a curved segment of the Earth’s surface. TDOA processing over a wide surveillance area is desirable in a practical passive detection system. It enables a reduction in the overall detection system’s physical complexity by reducing the minimum number of receivers deployed, thereby reducing the amount of data to be collected and processed.

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Intelligence;Surveillance and Reconnaissance;signal processing;counter-measures;passive detection and tracking;target localization
Report Number
DRDC-RDDC-2018-R136 — Scientific Report
Date of publication
01 May 2018
Number of Pages
Electronic Document(PDF)

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