Patent ID: 11946996
Assignee: APPLE INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A transponder for generating a predetermined delay of a first signal received at an object of interest in a radar-based object tracking system, the transponder comprising:
a receive antenna;
a receive amplifier configured for receiving, via the receive antenna, the first signal transmitted from a first radar;
a delay element configured for delaying the received first signal by a predetermined time delay;
a downconverter configured for mixing the received first signal with a first frequency source that operates with a frequency difference, wherein the frequency difference is a function of the predetermined time delay;
an upconverter configured for mixing the downconverted first signal with a second frequency source that operates with the frequency difference;
a transmit antenna; and
a transmit amplifier configured for transmitting, via the transmit antenna, a delayed first signal back to the first radar.