Intelligent tracking system and methods and systems therefor

A method comprising:

• modulating, via a transmission module of a passive tracking device, a response signal for transmission in a first frequency band such that the response signal has a carrier frequency based on an output frequency of a bulk acoustic wave reference oscillator;
• and
• outputting, via the transmission module, the modulated response signal to a first antenna for transmission in accordance with a communication protocol, the response signal including a message indicating a device identifier of the passive tracking device, wherein the transmission module includes the bulk acoustic wave reference oscillator that produces an output frequency, the bulk acoustic wave reference oscillator including a bulk acoustic wave delay reference, a master clock, a time difference detector that detects a plurality of echoes of the bulk acoustic wave delay reference, a phase frequency detection module, and a loop filter, and wherein the bulk acoustic wave delay reference is a first bulk acoustic wave delay reference and the plurality of echoes is a first plurality of echoes.

A system comprising:

• means for modulating a response signal for transmission in a first frequency band such that the response signal has a carrier frequency based on an output frequency of a bulk acoustic wave reference oscillator of a passive tracking device;
• and
• means for outputting the modulated response signal to a first antenna for transmission in accordance with a communication protocol, the response signal including a message indicating a device identifier of the passive tracking device, wherein the transmission module includes the bulk acoustic wave reference oscillator that produces an output frequency, the bulk acoustic wave reference oscillator including a bulk acoustic wave delay reference, a master clock, a time difference detector that detects a plurality of echoes of the bulk acoustic wave delay reference, a phase frequency detection module, and a loop filter, and wherein the bulk acoustic wave delay reference is a first bulk acoustic wave delay reference and the plurality of echoes is a first plurality of echoes.