Location Algorithms

AeroScout is the only vendor that calculates both RSSI and TDOA-based location, coming from the same tag signals. Unlike vendors who promote just one of these algorithms, AeroScout recognizes that each fills a specific need, and offers tags that can smoothly transition between the two. This means that AeroScout tags can roam seamlessly between environments and continue to be located, without switching frequencies or suffering a loss of accuracy.

Received Signal Strength Indication (RSSI): The RSSI algorithm compares the strength of Wi-Fi RFID signals to an expectation of that strength, in order to determine accurate positioning. RSSI is ideal for indoor asset tracking, where receivers (access points) are often already installed for data and/or voice services. RSSI is typically used in RTLS systems that utilize 2.4 GHz or 915 MHz.

Time Difference of Arrival (TDOA): The TDOA algorithm measures the time of arrival of a signal from multiple points, and compares those times of arrival to determine the accurate source of the signal. Because time of arrival is related in a linear manner with distance, the TDOA algorithm is ideal for asset tracking in wide open spaces such as outdoors or open indoor areas (hangars, manufacturing facilities, etc.) TDOA is typically used in RTLS systems that utilize 2.4 GHz or UWB.