US 2022/0066019 A1 · Method and Technique of Power-Efficient Two-Way Phase Based Distance Estimation Using Packet Synchronized Data Capture

Abstract

A wireless ranging system (700) estimates a distance (703) between wireless devices (701, 702) by calibrating the devices through exchanging calibration packets (512, 524) to adjust transceiver settings for performing phase measurements at the wireless devices, and then transmitting a measurement packet (704) from a first wireless device to a second wireless device to synchronize the first and second wireless devices and to perform a two-way IQ data capture sequence at different carrier frequencies during processing of the measurement packet so that the first and second wireless devices each measure phase values for each of the plurality of different carrier frequencies, where the phase values at each of the first and second wireless devices are processed to generate a combined phase offset vector which is processed to determine a first estimated distance between the first and second wireless devices.

Claims20

Dependent claims

A method of estimating distance between first and second wireless radio devices in a wireless network comprising:

transmitting a measurement packet from the first wireless radio device to the second wireless radio device to synchronize the first and second wireless radio devices and to perform a synchronized two-way IQ data capture sequence at a plurality of different carrier frequencies during processing of the measurement packet so that the first and second wireless radio devices each measure a plurality of phase values for each of the plurality of different carrier frequencies;
processing the plurality of phase values at each of the first and second wireless radio devices to generate first and second phase vectors which are combined into a combined phase offset vector at the first wireless radio device;
and
determining a first estimated distance between the first and second wireless radio devices based on the combined phase offset vector.

1 more element

A device, comprising:

a radio configured to transmit a measurement packet to a wireless radio device for performing a synchronized two-way IQ data capture sequence with the wireless radio device at a plurality of different carrier frequencies during transmission of the measurement packet;
and
a processor configured to:
control the radio to perform the synchronized two-way IQ data capture sequence during transmission of the measurement packet by transmitting a plurality of different carrier frequency signals and by capturing IQ data samples from a corresponding plurality of different carrier frequency signals received from the wireless radio device;
to measure a first plurality of phase values for the IQ samples captured from the corresponding plurality of different carrier frequency signals;
to process the first plurality of phase values with a second plurality of phase values received from the wireless radio device to form a phase offset vector;
and
to determine a first estimated distance between the device and the wireless radio device based on the phase offset vector.

5 more elements

A device, comprising:

a radio configured to receive a measurement packet from a wireless radio device for performing a synchronized two-way IQ data capture sequence with the wireless radio device at a plurality of different carrier frequencies during reception of the measurement packet;
and
a processor configured to:
control the radio to perform the synchronized two-way IQ data capture sequence during reception of the measurement packet by transmitting a plurality of different carrier frequency signals and by capturing IQ data samples from a corresponding plurality of different carrier frequency signals received from the wireless radio device;
to measure a first plurality of phase values for the IQ samples captured from the corresponding plurality of different carrier frequency signals to generate a phase vector;
and
to transmit the phase vector to the wireless radio device which calculates a phase offset vector to determine a first estimated distance between the device and the wireless radio device.

4 more elements

Dependencies are inferred from the claim text.

Method and Technique of Power-Efficient Two-Way Phase Based Distance Estimation Using Packet Synchronized Data Capture

Life of this patent

Method and Technique of Power-Efficient Two-Way Phase Based Distance Estimation Using Packet Synchronized Data Capture

Life of this patent

Abstract

Claims20