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US 6,204,804 B1Granted
Method for determining object movement data
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorBengt Lennart Andersson
Life of this patent
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Abstract
The velocity vector of a moving object is precisely determined by using radar measurements of the angle to and the radial speed of a moving object. This can be done in a radar system comprising one or more units. The technique also makes it possible to precisely determine the range to a moving object from a single moving radar unit.
Claims7
A method for determining movement information of a moving object from data provided by a radar system comprising at least one radar unit (F1, F2), whereby
- the at least one radar unit (F1, F2) is scanning objects in a given plane and is determining the radial speed (v1, v2) of the moving object, the at least one radar unit (F1, F2) is furthermore determining the angle (β1, β2) to the moving object with respect to a predetermined co-ordinate system, whereby
- two measurements of said radial speed (v1, v2) and said angle (β1, β2) are performed by means of the at least one radar unit (F1, F2) at two different positions, whereby
- the angle (α) of the velocity vector (v, α) of an object with respect to the predetermined co-ordinate system is determined according to α = tg - 1 ( v 2 cos ( β 1 ) - v 1 cos ( β 2 ) v 1 sin ( β 2 ) - v 2 sin ( β 1 ) )
- and the speed (v) of the velocity vector (v, α) is determined according to v = - v 1 cos ( α - β 1 ) or v = - v 2 cos ( α - β 2 ) .
1 more element
Dependencies are inferred from the claim text.