Radial-shape wireless dog fence system and method

A wireless fence system for containing one or more dogs in a generally circular user-defined roaming area comprising:

• a base unit including a transceiver unit, a location of said base unit defining a center point of said generally circular user-defined roaming area with a fence radius of said user-defined area being defined by a user during system set-up, an area outside said roaming area constituting a trigger zone;
• at least one collar worn by a dog, said collar including a transceiver unit in signal communication with said base unit transceiver unit, said system configured to continuously obtain distance values between the base unit and the collar on a real time basis using said transceiver units and to calculate a current estimate of a distance between the dog and the base unit on an ongoing basis;
• said collar including a correction unit that initiates administration of a correction to the dog when the current estimate calculated by the system indicates the dog is in the trigger zone;
• said system being configured to include a normal battery conservation mode and an accelerated mode in which distance values between the base unit and the collar are measured more frequently than in said battery conservation mode, said system being configured to enter said accelerated mode when a difference between the fence radius and the current estimate of the distance between the dog and the base unit is less than a threshold value and to remain in said battery conservation mode when the difference between the fence radius and the current estimate of the distance between the dog and the base unit is greater than said threshold value;
• said system being further configured to weight and filter a plurality of said continuously obtained distance values when calculating the current estimate and to assign less weight to distance values considered suspect due to disparity between said suspect distance values and previously measured distance values and previously calculated estimates of the distance between the dog and the base unit.