Detecting motion based on repeated wireless transmissions

摘要

In a general aspect, motion of an object is detected based on wireless signals. In some aspects, wireless signals based on a repeated wireless transmission are received at a wireless sensor device in a space. The received wireless signals are analyzed, by operation of a processor, to detect movement of an object in the space. The analysis includes determining complex values representing the relative phases and amplitudes of respective frequency components of each of the received wireless signals, and detecting movement of an object in the space based on a change in the complex values.

主权项

1. A motion detection method comprising:
receiving, at a wireless sensor device in a space and at a first time, a first received wireless signal based on a first transmission of a transmitted wireless signal, the first transmission being transmitted by a source device; determining, by operation of a processor, a first characteristic of frequency components in a bandwidth of a first signal, the first characteristic comprising a first set of complex values for the frequency components in the bandwidth of the first signal, the first signal being based on the first received wireless signal; receiving, at the wireless sensor device and at a second, later time, a second received wireless signal based on a second transmission of the transmitted wireless signal, the second transmission being transmitted by the source device; determining, by operation of the processor, a second characteristic of frequency components in the bandwidth of a second signal, the second characteristic comprising a second set of complex values for the frequency components in the bandwidth of the second signal, the second signal being based on the second received wireless signal; and detecting movement of an object in the space based on a comparison between the first characteristic and the second characteristic.