Method of reducing power consumption of a radio badge in a boundary detection localization system

A method of reducing power consumption of a radio badge in a boundary detection localization system, the radio badge being carried by a tracked target, performing location sampling communication with an infrastructure component of the localization system at the start and end of sampling time intervals such that positions of the radio badge can be estimated, and being provided with an accelerometer, said method comprising:

• (a) determining a velocity of the radio badge if it is determined from an output of the accelerometer that the radio badge is in a mobile state;
• (b) estimating a critical time for the radio badge to reach a critical region through division in which a critical distance from an estimated position obtained at the end of a most recent sampling time interval to the critical region is the dividend, and the velocity of the radio badge is the divisor;
• and
• (c) controlling the radio badge to perform location sampling communication with the infrastructure component of the localization system at the end of the critical time.

A method of reducing power consumption of a radio badge in a boundary detection localization system, the radio badge being carried by a tracked target and performing location sampling communication with an infrastructure component of the localization system at the start and end of sampling time intervals such that positions of the radio badge can be estimated, said method comprising:

• (a) determining a velocity of the radio badge;
• (b) estimating a critical time for the radio badge to reach a critical region through division in which a critical distance from an estimated position obtained at the end of a most recent sampling time interval to the critical region is the dividend, and the velocity of the radio badge is the divisor;
• and
• (c) controlling the radio badge to perform location sampling communication with the infrastructure component of the localization system at one of the end of a preset extended time interval if the estimated critical time is greater than a predetermined upper bound,
• the end of a preset shortened time interval shorter than the extended time interval if the estimated critical time is less than a predetermined lower bound, and
• the end of the estimated critical time if the estimated critical time falls between or on the upper and lower bounds.