What is the difference between TDOA and TWR modes？

Power Use: In the TDOA system, the positioning tag can be dormant for most of the time. The tag only needs to wake up periodicall to send a positioning signal, which is received by all the anchors for positioning. The rest of the time the tag is asleep, saving power. In the TWR system, the tag is required to interact with each anchor 3 times. If there are 4 positioning anchors, the tag needs to transmit 12 signals for each positioning.

Spectrum Use: In TDOA, the tag is always active, which consumes relatively more power. Frequent signaling takes up the communication spectrum, reducing the number of positioning tags the system can support.

Accuracy: TDOA positioning accuracy is slightly lower than TWR due to some errors caused by clock synchronization and running.

Installation: TDOA requires clock calibration and synchronization between anchors, and the deployment and construction of the system is more complicated than the TWR approach.