https://au.mathworks.com/help/simulink/supportpkg/legomindstormsev3_ref/encoder.html
Encoder - Measure incremental position and direction of motor connected to EV3 brick - Simulink
Use the Encoder block to measure the incremental wheel rotation of the motor connected to an EV3 brick in degrees.
position and direction
https://repository.gatech.edu/entities/publication/0cbe28c6-7f6a-4b3c-935e-d1477ff09a49
Position And Direction Finding Instrument
A position and direction finding instrument including a single, direction-finding, multimode antenna having at least four (4) arms for receiving RF signals...
position and directionfindinginstrument