(i) installing the casing string into a liquid filled borehole, during which a fluid in the borehole enters and fills an interior of the casing string, the casing string comprising at least one region with a negative or a positive change of inner cross-sectional dimension proximate to a casing collar;

(ii) installing:

(iii) placing the droppable object inside the casing string;

(iv) pumping a displacement fluid behind the droppable object, causing the droppable object to travel through the interior of the casing string and pass through and contact the at least one region with a negative or a positive change of inner cross-sectional dimension, the contact thereby directly generating one or more pressure pulses in the fluid;

(v) using the at least one pressure transducer to detect and record pressure data related to the one or more pressure pulses and transmit the pressure data to the pressure data acquisition system, the pressure data comprising data corresponding to the one or more pressure pulses directly generated by the droppable object passing the casing collars, one or more reflected pressure pulses reflected directly from the droppable object, or a combination thereof; and

(vi) processing the pressure data mathematically and determining a position of the droppable object via the pressure data acquisition system,

wherein the mathematical processing comprises fusion of the pressure data by a Kalman filter.