Super resolution radio frequency location determination

A device comprising:

• radio frequency circuitry configured to transmit a first packet toward a second device and receive a second packet from the second device;
• and
• a processor coupled to the radio frequency circuitry and configured to:
• detect a first phase and a first amplitude determined for the first packet by the second device;
• determine a second phase and a second amplitude for the second packet;
• determine a multipath component based on the first phase and the first amplitude determined for the first packet by the second device and the second phase and the second amplitude determined for the second packet;
• and
• determine a distance to the second device based on the multipath component;
• wherein a packet comprises an access address.

A device comprising:

• radio frequency circuitry configured to receive a first packet from a distance determining device at a first frequency and transmit a second packet toward the distance determining device at a second frequency that is different than the first frequency, the radio frequency circuitry including a first phase-locked loop (PLL);
• and
• a processor coupled to the radio frequency circuitry and configured to:
• determine a phase and an amplitude for the first packet;
• send the determined phase and amplitude for the first packet toward the distance determining device;
• and
• maintain an initial phase of the first PLL relative to an initial phase of a second PLL in the distance determining device when the phase and amplitude for the first packet is determined and as the second packet is transmitted toward the distance determining device;
• wherein a packet comprises an access address.

A method for determining a distance between first and second devices, the method comprising:

• transmitting a first packet by the first device toward the second device;
• receiving, by the first device from the second device, a first phase and a first amplitude determined for the first packet by the second device;
• receiving, by the first device from the second device, a second packet;
• determining, by the first device, a second phase and a second amplitude for the second packet;
• and
• determining, by the first device, the distance between the first and second devices based on the first phase and the first amplitude determined for the first packet by the second device and the second phase and the second amplitude determined for the second packet by the first device;
• wherein a packet comprises a preamble.

A device comprising:

• radio frequency circuitry configured to transmit a first packet toward a second device and receive a second packet from the second device;
• and
• a processor coupled to the radio frequency circuitry and configured to:
• detect a first phase and a first amplitude determined for the first packet by the second device;
• determine a second phase and a second amplitude for the second packet;
• determine a multipath component based on the first phase and the first amplitude determined for the first packet by the second device and the second phase and the second amplitude determined for the second packet;
• and
• determine a distance to the second device based on the multipath component;
• wherein a packet comprises a preamble.