Differential doppler based rf sensing

A method of frequency difference of arrival (FDOA)-based sensing for a transmitting device performed by a receiving device, the method comprising:

• receiving at a first time point, a reflection of a first radio frequency (RF) signal transmitted by the transmitting device;
• receiving at a second time point, a reflection of a second RF signal transmitted by the transmitting device;
• receiving at a third time point, a reflection of a third RF signal transmitted by the transmitting device;
• determining frequency offsets of the reflections of the first RF signal, the second RF signal, and the third RF signal;
• and
• determining a first FDOA measurement determined based on the frequency offset of the reflection of the first RF signal and the frequency offset of the reflection of the second RF signal, and a second FDOA measurement determined based on the frequency offset of the reflection of the second RF signal and the frequency offset of the reflection of the third RF signal.

A server for frequency difference of arrival (FDOA)-based sensing of a transmitting device, the server comprising:

• a transceiver;
• a memory;
• and
• one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to:
• transmit, to the transmitting device, a FDOA-based sensing configuration, wherein the FDOA-based sensing configuration configures the transmitting device to:
• transmit at a first time point, a first radio frequency (RF) signal;
• transmit at a second time point, a second RF signal;
• and
• transmit at a third time point, a third RF signal;
• obtain a first FDOA measurement determined based on a reflection of the first RF signal and a reflection of the second RF signal, and a second FDOA measurement determined based on the reflection of the second RF signal and a reflection of the third RF signal, wherein the reflections of the first, the second, and the third RF signals are reflected by a reflector and received at a receiving device;
• obtain Doppler information of the reflector;
• and
• obtain Doppler information of the transmitting device based on the first FDOA measurement and the second FDOA measurement, and the Doppler information of the reflector.

A device for frequency difference of arrival (FDOA)-based sensing of a transmitting device, the device comprising:

• a transceiver;
• a memory;
• and
• one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to:
• receive at a first time point, a reflection of a first radio frequency (RF) signal transmitted by the transmitting device;
• receive at a second time point, a reflection of a second RF signal transmitted by the transmitting device;
• receive at a third time point, a reflection of a third RF signal transmitted by the transmitting device;
• determine frequency offsets of the reflections of the first RF signal, the second RF signal, and the third RF signal;
• and
• determine a first FDOA measurement determined based on the frequency offset of the reflection of the first RF signal and the frequency offset of the reflection of the second RF signal, and a second FDOA measurement determined based on the frequency offset of the reflection of the second RF signal and the frequency offset of the reflection of the third RF signal.