US 11,906,619 B2 · Saturation compensation using a smart-device-based radar system

Abstract

Techniques and apparatuses are described that implement a smart-device-based radar system capable of detecting user gestures in the presence of saturation. In particular, a radar system employs machine learning to compensate for distortions resulting from saturation. This enables gesture recognition to be performed while the radar system's receiver is saturated. As such, the radar system can forgo integrating an automatic gain control circuit to prevent the receiver from becoming saturated. Furthermore, the radar system can operate with higher gains to increasing sensitivity without adding additional antennas. By using machine learning, the radar system's dynamic range increases, which enables the radar system to detect a variety of different types of gestures having small or large radar cross sections, and performed at various distances from the radar system.

Claims20

Dependent claims

A smart device comprising:

a radar system including:
a transceiver configured to:
be coupled to at least one antenna;
transmit, via the at least one antenna, a radar transmit signal;
and
receive, via the at least one antenna, a radar receive signal, the radar receive signal including a portion of the radar transmit signal that is reflected by a user, the radar receive signal causes the transceiver to become saturated such that the radar receive signal comprises a saturated receive signal, the saturated receive signal comprising an analog signal having a clipped amplitude that is constrained by an upper bound or a lower bound, the upper bound or the lower bound causing the amplitude of the analog signal to be relatively constant at the upper bound or the lower bound for a portion of the analog signal;
and
a saturation compensation module coupled to the transceiver and configured to generate, based on the saturated radar receive signal and using a machine-learned module, a predicted signal, the predicted signal comprising a sinusoidal signal.

5 more elements

A non-transitory computer-readable storage media comprising computer-executable instructions that, responsive to execution by a processor, implement:

a saturation compensation module configured to:
accept an input data sequence associated with a saturated radar receive signal, the saturated radar receive signal having a clipped amplitude that distorts a motion component signal associated with a gesture performed by a user, the saturated radar receive signal including a distorted version of the motion component signal;
and
recover, using a machine-learned module, the motion component signal from the input data sequence to produce a predicted data sequence based on the motion component signal, the predicted data sequence comprising a sinusoidal signal.

1 more element

Dependencies are inferred from the claim text.

Saturation compensation using a smart-device-based radar system

Life of this patent

Saturation compensation using a smart-device-based radar system

Life of this patent

Abstract

Claims20