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Method for determining position and velocity of targets from signals scattered by the targets

  • US 20040135718A1
  • Filed: 11/10/2003
  • Published: 07/15/2004
  • Est. Priority Date: 05/11/2001
  • Status: Active Grant
First Claim
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1. Method for determining position and velocity of targets from signals scattered by the targets, characterised in that one uses a first and a second station comprising transmitter/receiver (s1,s2) of electromagnetic or acoustic signals and carries out mono-static measurements (M1,M2) from each station, and also a bi-static measurement between the stations (B12), and first from the two mono-static measurements calculates a number of target candidates with 2-dimensional position and 2-dimensional velocity, whereupon these are tested against the result of the bi-static measurement and the target candidates found in all the measurements with suitable error margins are retained, whereby the calculations take place in a 2-dimensional position space and a 2-dimensional velocity space and give the position and the velocity modulo rotational symmetry around a line through the two stations ((s1,s2) in that one utilises that rotational symmetry results in the ability to represent conceivable measured target positions in a 3-dimensional position space, which lies along arcs with centre on the axis of symmetry, by a point (P(t)) in a half-plane (P12) on one side of the axis of symmetry, which makes a 2-dimensional position space, and that the velocity can be represented by a velocity in a 2-dimensional velocity space that is a plane tangent to said point.

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