Ultrasound is essentially a cyclic sound pressure with a frequency greater than the upper limit of human hearing.

Alone, ultrasound technology cannot power an RTLS system, but when used in combination with an RFID or Wi-Fi infrastructure, it can be incredibly valuable. Because ultrasound light is bound by walls, we can use it to achieve “positive room identification” — that is, we can positively determine in which room (versus zone) a tagged object or person is located. This is an important feature for the purpose of analyzing and optimizing medical-equipment flow and patient/clinician interactions.

Ultrasound technology can increase the value of an RTLS system substantially. Learn more about the power of hybrid solutions that incorporate ultrasound…


A typical ultrasound-based tracking system consists of multiple tags and detectors. The tags are battery-powered wireless devices which are attached to movable objects such as medical equipment and people. Ultrasound tags may come in different forms, but they work in essentially the same way: they transmit their unique identification number using ultrasound waves — either at pre-defined time intervals or when a built-in motion sensor detects movement of the tag. The ultrasound waves transmitted by tags are received by ultrasound detectors, which analyze the signal and forward the location and time information via RFID or Wi-Fi to a tracking database that resides on a central server.

Some but not all RFID and Wi-Fi systems are also designed with this important feature.

Another advantage of ultrasound-based tracking systems is that ultrasound waves are mechanical waves that do not interfere with sensitive equipment that might otherwise be disturbed by some electromagnetic signals.


VIZZIA utilizes ultrasound-based tracking technologies from our partner Sonitor.