Abstract: A system for identifying one or more product engagements includes one or more microsensors configured to measure one or more signals indicative of one or more near-product engagements within a retail environment. Near-product engagements product movement, customer proximity to products, temperature, and the like. In some embodiments, the system may be configured to generate spatial relationship data associated with one or more spatial relationships between one or more transmitting electronic devices and one or more sensor units. The system may perform one or more filtering steps on the near-product engagement or spatial relationship data and providing the filtered data to a user interface.

Abstract: A receiver is synchronized to a signal and the presence of data in the signal is detected by responding to the signal to derive indications of the amount of time shift necessary to achieve synchronization between the receiver and signal. The receiver is adjusted to be in synchronization with the signal in response to the time shift indications. A measure of the spread of values of the time shift indications is derived. The presence of data in the signal is flagged in response to the spread of values being less than a threshold value.