Zone detection in a GNSS system
First Claim
1. A method for zone based detection of vehicles passing into and out from a geographical zone using polygons to define a border of said zone, wherein a first polygon (32) defines a first virtual border, wherein a vehicle is compared by use of a global navigation satellite system (GNSS) (10) comprising an on-board-unit (OBU) (2) with solely the first virtual border to determine the vehicle is passing into the geographical zone, and a second polygon (31) larger than the first polygon (32) and completely enveloping said first polygon defines a second virtual border wherein the vehicle is compared by use of the GNSS system with solely the second virtual border to determine the vehicle is passing out the geographical zone, wherein the geographical zone (34) is between the first polygon (32) and the second polygon (31) and a distance (r) between the first virtual border and the second virtual border varies along the respective polygon borders in accordance with predetermined local factors.
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Accused Products
Abstract
Method and system for zone based detection of vehicles passing into and out from a geographical zone using polygons to define the border of said zone, wherein a first polygon (32) defines a virtual border against which vehicles passing into the zone is compared by use of a GNSS system (10) comprising an OBU (2) in every vehicle to be surveyed by the method. A second polygon (31) larger than the first polygon (32) and completely enveloping said first polygon is defined as a virtual border against which objects passing out from the zone is compared by use of the GNSS system.
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Citations
15 Claims
- 1. A method for zone based detection of vehicles passing into and out from a geographical zone using polygons to define a border of said zone, wherein a first polygon (32) defines a first virtual border, wherein a vehicle is compared by use of a global navigation satellite system (GNSS) (10) comprising an on-board-unit (OBU) (2) with solely the first virtual border to determine the vehicle is passing into the geographical zone, and a second polygon (31) larger than the first polygon (32) and completely enveloping said first polygon defines a second virtual border wherein the vehicle is compared by use of the GNSS system with solely the second virtual border to determine the vehicle is passing out the geographical zone, wherein the geographical zone (34) is between the first polygon (32) and the second polygon (31) and a distance (r) between the first virtual border and the second virtual border varies along the respective polygon borders in accordance with predetermined local factors.
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13. A system for zone based detection of vehicles passing into and out from a geographical zone by use of a global navigation satellite system (GNSS) (10), said GNSS system comprising:
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on-board-units (OBUs) (12) in the vehicles to be detected, said OBUs receiving signals from a plurality of satellites (11) to provide estimates of position coordinates for the vehicle, a central processing unit (CPU) (23) that implements a method for zone based detection of vehicles passing into and out from the geographical zone using polygons to define the border of said geographical zone, wherein a first polygon (32) defines a first virtual border, wherein a vehicle is compared by use of the (GNSS) system (10) comprising an on-board-unit (OBU) (12) of the on-board-units (OBUs) with solely the first virtual border to determine the vehicle is passing into the geographical zone, storage medium (25) for polygon definitions, a wireless communication unit (24), wherein the system is arranged to define a second polygon (31) larger than the first polygon (32) and completely enveloping said first polygon (32) with the geographical zone (34) between the first polygon (32) and the second polygon (31), the second polygon (31) defining a second virtual border, wherein the vehicle is compared by use of the GNSS system with solely the second virtual border to determine the vehicle is passing out the geographical zone, wherein a distance (r) between the first virtual border and the second virtual border varies along the respective polygon borders in accordance with predetermined local factors. - View Dependent Claims (14)
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Specification