Systems and methods to determine motion parameters of physical objects using radio frequency identification tags attached to the objects. The closed-captioning content includes subtitles related to the broadcast signal and uniform resource locator data. A generating unit generates carousel data including the plurality of sets of broadcast data. The output of each I-mixer is filtered to remove sum products of the excitation and response signals, thereby leaving an amplitude modulation component of the signal, which is processed in a control loop to track the resonant frequency of each resonant structure.