A system and method to determine a range between a first device (e.g., an object device) and a second device (e.g., a remote device) based on a characteristic of phase determined with respect to transmissions from a first device to the second device, and optionally a return transmission from the…
Systems and methods of measuring distance between two wireless devices by combining phase shift and time-of-flight measurements. A first wireless devices sends a first packet to the second wireless device. After receiving the first packet, the second wireless device sending to the first wireless…
A system is provided and includes a receiver and an access module. The receiver is configured to receive a signal transmitted from a portable access device to a vehicle. The access module is configured to generate a differentiated signal based on the received signal, up-sample the differentiated…
Systems and methods of measuring distance between two wireless devices by combining phase shift and time-of-flight measurements. A first wireless devices sends a first packet to the second wireless device. After receiving the first packet, the second wireless device sending to the first wireless…
A distance measurement apparatus of an embodiment includes a first device provided in a vehicle and a second device provided in a key-fob, and calculates a distance between the vehicle and the key-fob based on carrier phase detection. In at least one of the first device and the second device…