Method for determining position and velocity of targets from signals scattered by the targets
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to a method for determining position and velocity of targets from signals scattered by the targets. 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 calculates first through the two mono-static measurements 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 which are found In all measurements with suitable error margins are retained.
7 Citations
5 Claims
- 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.
Specification