Concurrent detection of absolute distance and relative movement for sensing action gestures
First Claim
1. A device comprising:
- a processing system; and
a radar-based gesture detection component implemented at least partially in hardware and comprising;
a two-tone radar front-end component comprising a radar-emitting element for emitting a first carrier frequency tone and a second carrier frequency tone;
an antenna for receiving incoming radio frequency (RF) signals generated by the first carrier frequency tone and the second carrier frequency tone reflecting off a target object;
a direct-conversion homodyne receiver electrically coupled to the antenna for receiving the incoming RF signals from the antenna and converting the incoming RF signals into baseband quadrature signals;
at least one analog-to-digital converter (ADC) to digitize the baseband quadrature signals to generate digital samples; and
a processing pipeline component for detecting absolute distance and relative movement information about the target object by processing the digital samples.
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Accused Products
Abstract
A gesture detection system uses two radar tones to concurrently detect absolute distance and relative movement of a target object. A radar-based detection device alternates transmitting a first radar tone and a second radar tone via a radar-emitting device, and then captures a first return signal and a second return signal that are generated by the first radar tone and second radar tone reflecting off the target object. The radar-based detection device demodulates the return signals into a first set of quadrature signals and a second set of quadrature signals and, in some cases, generates a first set of digital samples and second set of digital samples from the respective quadrature signals. Various aspects process the first set of digital samples and second set of digital samples to concurrently identify absolute distance and relative movement and, at times, determine an in-the-air gesture performed by the target object.
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Citations
20 Claims
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1. A device comprising:
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a processing system; and a radar-based gesture detection component implemented at least partially in hardware and comprising; a two-tone radar front-end component comprising a radar-emitting element for emitting a first carrier frequency tone and a second carrier frequency tone; an antenna for receiving incoming radio frequency (RF) signals generated by the first carrier frequency tone and the second carrier frequency tone reflecting off a target object; a direct-conversion homodyne receiver electrically coupled to the antenna for receiving the incoming RF signals from the antenna and converting the incoming RF signals into baseband quadrature signals; at least one analog-to-digital converter (ADC) to digitize the baseband quadrature signals to generate digital samples; and a processing pipeline component for detecting absolute distance and relative movement information about the target object by processing the digital samples. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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transmitting, using a radar-based gesture detection system, a first carrier frequency tone via a radar-emitting element of the radar-based gesture detection system; demodulating, using the radar-based gesture detection system, a first return signal generated by the first carrier frequency tone reflecting off a target object to generate a first set of baseband quadrature signals; transmitting, using the radar-based gesture detection system, a second carrier frequency tone via the radar-emitting element of the radar-based gesture detection system; demodulating, using the radar-based gesture detection system, a second return signal generated by the second carrier frequency tone reflecting off a target object to generate a second set of baseband quadrature signals; concurrently extracting, using the radar-based gesture detection system, absolute distance and relative movement information based, at least in part, on the first set of baseband quadrature signals and the second set of baseband quadrature signals; and identifying a gesture performed by the target object using the absolute distance and relative movement information. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A device comprising:
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a two-tone radar front-end component for; transmitting a first carrier frequency tone; receiving a first return signal generated by the first carrier frequency tone reflecting off a target object; demodulating the first return signal into a first set of baseband quadrature signals; transmitting a second carrier frequency tone; receiving a second return signal generated by the second carrier frequency tone reflecting off the target object; and demodulating the second return signal into a second set of baseband quadrature signals; and a digital signal processing component for; generating a first set of digital samples from the first set of baseband quadrature signals; generating a second set of digital samples from the second set of baseband quadrature signals; and concurrently extracting absolute distance and relative movement information associated with the target object by processing the first set of digital samples and the second set of digital samples. - View Dependent Claims (18, 19, 20)
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Specification