Method for determining position and velocity of targets from signals scattered by the targets
First Claim
1. A method for determining positions and velocities of targets from signals scattered by the targets, comprising the steps of:
- using a first station and a second station, each of said stations including a transmitter/receiver of electromagnetic or acoustic signals, and carrying out a mono-static measurement from each of said stations and also carrying out a bi-static measurement between said first and second stations as initial measurements;
calculating, from said mono-static measurements, a number of target candidates with two-dimensional position and two-dimensional velocity;
testing said target candidates against said bi-static measurement and retaining those target candidates that are found in all of said measurements with suitable error margins;
said step of calculating taking place in a two-dimensional position space and a two-dimensional velocity space and giving the position and the velocity modulo rotational symmetry around a line through said first and second stations, use of said rotational symmetry enabling conceivable measured target positions in a three-dimensional space, which lies along arcs with a center on the axis of symmetry, to be represented by a point (P(t)) in a half-plane on one side of the axis of symmetry, making a two-dimensional position space, and said velocity being represented by a vector in a two-dimensional velocity space that is in a plane tangent to said point.
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Abstract
A method for determining position and velocity of targets from signals scattered by the targets using a first and a second station each including a transmitter/receiver of electromagnetic or acoustic signals. First, mono-static measurements are carried out from each station, and also a bi-static measurement between the stations. The two mono-static measurements are used to calculate a number of target candidates with 2-dimensional position and 2-dimensional velocity. These target candidates 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.
10 Citations
12 Claims
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1. A method for determining positions and velocities of targets from signals scattered by the targets, comprising the steps of:
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using a first station and a second station, each of said stations including a transmitter/receiver of electromagnetic or acoustic signals, and carrying out a mono-static measurement from each of said stations and also carrying out a bi-static measurement between said first and second stations as initial measurements;
calculating, from said mono-static measurements, a number of target candidates with two-dimensional position and two-dimensional velocity;
testing said target candidates against said bi-static measurement and retaining those target candidates that are found in all of said measurements with suitable error margins;
said step of calculating taking place in a two-dimensional position space and a two-dimensional velocity space and giving the position and the velocity modulo rotational symmetry around a line through said first and second stations, use of said rotational symmetry enabling conceivable measured target positions in a three-dimensional space, which lies along arcs with a center on the axis of symmetry, to be represented by a point (P(t)) in a half-plane on one side of the axis of symmetry, making a two-dimensional position space, and said velocity being represented by a vector in a two-dimensional velocity space that is in a plane tangent to said point. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining positions and velocities of targets from signals scattered by the targets, comprising the steps of:
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carrying out a first mono-static measurement from a first station having a first transmitter/receiver of electromagnetic or acoustic signals;
carrying out a second mono-static measurement from a second station having a second transmitter/receiver of electromagnetic or acoustic signals;
carrying out a bi-static measurement between said first station and said second station;
calculating, from said first and second mono-static measurements, a number of target candidates with two-dimensional position and two-dimensional velocity; and
testing said target candidates against said bi-static measurement and retaining those target candidates found in all of said measurements within an error margin, non-retained target candidates being eliminated as ghost targets. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification