Method for calculating whether an actual location of a target device is on one side of a boundary zone includes: receiving an estimated location of the target device; receiving a desired confidence level; forming a first circle with radius D, centered at the estimated location, where D is the shortest distance from the estimated location to the boundary zone; forming a second circle with radius R′, centered at the estimated location, wherein R′ is determined in such a way so that a likelihood that the actual location is inside the second circle equals or exceeds the desired confidence level; forming an angle with an apex at the estimated location and rays passing through two closest points to the estimated location where the second circle intersects the boundary zone; and using a size of an annulus formed by the first circle, the second circle, and the rays to estimate whether the actual location lies on the same side of the boundary zone.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A method for calculating whether an actual location of a target device is on one side of a boundary zone, the method comprising: receiving an estimated location of the target device; receiving a desired confidence level; forming a first circle with radius D, centered at the estimated location, where D is the shortest distance from the estimated location to the boundary zone; forming a second circle with radius R′, centered at the estimated location, wherein R′ is determined in such a way so that a likelihood that the actual location is inside the second circle equals or exceeds the desired confidence level; forming an angle with an apex at the estimated location and rays passing through two closest points to the estimated location where the second circle intersects the boundary zone; and using a size of an annulus formed by the first circle, the second circle, and the rays to estimate whether the actual location lies on the same side of the boundary zone as the estimated location, wherein the method is performed by one or more processors. 2. The method of claim 1, wherein the desired confidence level is a desired estimated probability that the actual location of the target device is within an uncertainty zone. 3. The method of claim 2, wherein the desired confidence level is constant for estimated locations received from a particular source. 4. The method of claim 1, further comprising receiving a second estimated location of the target device; and selecting the received estimated or the second estimated location of the target device as the estimated location for further processing. 5. The method of claim 4, wherein said selection is made based on cost or quality of the source from where the estimated or the second estimated location of the target device is received. 6. The method of claim 1, further comprising receiving terrain or morphology information; and used the received terrain or morphology information, in addition to said size of the annulus, to estimate whether the actual location lies on the same side of the boundary zone as the estimated location. 7. A method for calculating whether an actual location of a target device is on one side of a boundary zone, the method comprising: receiving an estimated location L of the target device; receiving a desired confidence level; determining a distance D, where D is the shortest distance from the estimated location to the boundary zone; forming a circle with radius R′, centered at the estimated location, wherein R′ is determined in such a way so that a likelihood that the actual location is inside the circle equals or exceeds the desired confidence level; forming a secant, perpendicular to D, passing through the point where D intersects the boundary zone; and using a size of an area bounded by the circle and the secant to estimate whether the actual location lies on the same side of the boundary zone as the estimated location, wherein the method is performed by one or more processors. 8. The method of claim 7, wherein the desired confidence level is a desired estimated probability that the actual location of the target device is within an uncertainty zone. 9. The method of claim 8, wherein the desired confidence level is constant for estimated locations received from a particular source. 10. The method of claim 7, further comprising receiving a second estimated location of the target device; and selecting the received estimated or the second estimated location of the target device as the estimated location for further processing. 11. The method of claim 10, wherein said selection is made based on cost or quality of the source from where the estimated or the second estimated location of the target device is received. 12. The method of claim 7, further comprising receiving terrain or morphology information; and used the received terrain or morphology information, in addition to said size of the annulus, to estimate whether the actual location lies on the same side of the boundary zone as the estimated location.