Systems, methods, and media for determining a three dimensional location of an object associated with a person at risk of falling down

A system for determining a three dimensional location of a remote monitor associated with a person at risk of falling down, the system comprising:

• a first ultrasonic transducer at a first position in relation to a monitored space;
• a second ultrasonic transducer at a second position in relation to the monitored space;
• a detector;
• and
• a processor coupled to the first ultrasonic transducer, the second ultrasonic transducer, and the detector, the processor programmed to:
• cause the first ultrasonic transducer to emit a first ultrasound signal at a first time;
• detect, at a second time that is subsequent to the first time using the detector, a first wireless signal emitted by the remote monitor;
• determine a first distance value, representing a distance between the first ultrasonic transducer and the remote monitor at the second time based on a difference between the first time and the second time and a propagation speed of sound in the monitored space;
• cause the second ultrasonic transducer to emit a second ultrasound signal at a third time that is subsequent to the first time;
• detect, at a fourth time that is subsequent to the third time using the detector, a second wireless signal emitted by the remote monitor;
• and
• determine a second distance value, representing a distance between the second ultrasonic transducer and the remote monitor at the fourth time based on a difference between the third time and the fourth time and the propagation speed of sound in the monitored space.