Ultra-High Frequency Low Energy Based Phone As A Key Access To A Vehicle Using Two-Way Communication For Multipath Mitigation

A system comprising:

• a first transceiver implemented at a vehicle and configured to (i) receive a first radio frequency signal from a portable access device via a plurality of antennas, (ii) transmit a second radio frequency signal from the vehicle to the portable access device, and (iii) receive a third radio frequency signal from the portable access device, wherein the third radio frequency signal indicates at least one of (i) an angle of departure of the first radio frequency signal, or (ii) a second angle of arrival of the second radio frequency signal as received at the portable access device;
• and
• an access module configured to
• estimate a first angle of arrival of the first radio frequency signal,
• determine a resultant angle of arrival based on the first angle of arrival and at least one of (i) the angle of departure, or (ii) the second angle of arrival,
• determine a first location of the portable access device relative to the vehicle based on the resultant angle of arrival, and
• permit at least one of access to the vehicle or control of a portion of the vehicle based on the first location of the portable access device.