Methods, circuits, and apparatus for motion detection, doppler shift detection, and positioning by self-envelope modulation
AssigneeRichWave Technology Corp.
InventorTse-Peng Chen
Life of this patent
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Abstract
Methods and apparatus for detecting motion of an object in an environment, the method including transmitting a first wireless signal related to a transmission signal and receiving a second wireless signal related to an incoming signal, wherein the second wireless signal is a reflected first wireless signal from the object, obtaining a modulation signal related to a combination of the transmission and incoming signals, wherein the modulation signal contains a Doppler shift caused by the motion of the object, extracting a signal envelope varied by the Doppler shift from the modulation signal, and determining whether motion of the object is detected in accordance with the signal envelope.
Claims20
A method for detecting motion of an object in an environment, comprising:
- transmitting a first wireless signal related to a transmission signal and receiving a second wireless signal related to an incoming signal, wherein:
- the transmission signal is a continuous wave signal,
- transmitting the first wireless signal includes transmitting the first wireless signal based on an output signal provided by a power amplifier, and
- the second wireless signal is a reflected first wireless signal from the object;
- obtaining a modulation signal by combining the continuous wave signal and the incoming signal, wherein the modulation signal contains a Doppler shift caused by the motion of the object;
- extracting a signal envelope varied by the Doppler shift from the modulation signal;
- determining whether a first signal level of the signal envelope exceeds a first predetermined threshold and a second signal level of the signal envelope is lower than a second predetermined threshold, the first predetermined threshold being higher than the second predetermined threshold;
- and
- responsive to a determination that the first signal level of the signal envelope exceeds the first predetermined threshold and the second signal level of the signal envelope is lower than the second predetermined threshold, determining detection of the motion of the object.
A circuit for detecting motion of an object in an environment, comprising:
- a transmission chain configured to transmit a first wireless signal related to a transmission signal, the transmission chain including a power amplifier, wherein the transmission signal is a continuous wave signal;
- a sensing circuit configured to obtain a modulation signal by combining the continuous wave signal and an incoming signal, wherein:
- the modulation signal contains a Doppler shift caused by the motion of the object, and
- the incoming signal is obtained from a second wireless signal, the second wireless signal being a reflected first wireless signal from the object;
- an envelope extraction circuit configured to extract a signal envelope varied by the Doppler shift from the modulation signal;
- and
- a detector circuit configured to:
- determine whether a first signal level of the signal envelope exceeds a first predetermined threshold and a second signal level of the signal envelope is lower than a second predetermined threshold, the first predetermined threshold being higher than the second predetermined threshold;
- and
- responsive to a determination that the first signal level of the signal envelope exceeds the first predetermined threshold and the second signal level of the signal envelope is lower than the second predetermined threshold, determine detection of the motion of the object.
A circuit for detecting motion of an object in an environment, the circuit comprising:
- a transmission chain including a power amplifier, a sensing circuit, and a single antenna coupled together, the transmission chain configured to transmit, by the single antenna, a first wireless signal related to a transmission signal, wherein:
- the transmission signal is a continuous wave signal;
- the single antenna is configured to receive a second wireless signal as an incoming signal, the second wireless signal being a reflected first wireless signal from the object;
- and
- the sensing circuit is configured to obtain a modulation signal by combining the continuous wave signal and the incoming signal, wherein the modulation signal contains a Doppler shift caused by the motion of the object;
- an envelope extraction circuit configured to extract a signal envelope varied by the Doppler shift from the modulation signal;
- and
- a detector circuit configured to:
- determine that a signal level of the signal envelope exceeds a predetermined threshold;
- and
- responsive to the determination that the signal level of the signal envelope exceeds the predetermined threshold, determine detection of the motion of the object.
Dependencies are inferred from the claim text.