Transmitter-receiver Leakage Suppression in Integrated Radar Systems

A radar system comprising a front-end, wherein the front-end comprises:

• a transmit path comprising a power amplifier and a transmit antenna, wherein the transmit path is configured to transmit a transmit signal;
• a receive path comprising a receive antenna and a low-noise amplifier,
• wherein the receive path is configured to receive at least a leakage from the transmit path, and
• wherein the receive path is configured to generate an amplified signal of the leakage;
• a reference path derived from the transmit path and configured to generate a reference signal;
• a mixer configured to mix the amplified signal with the reference signal to generate an output signal at intermediate frequency;
• a compensation unit in the reference path,
• wherein the compensation unit is configured to generate compensation for a leakage path between the transmit path and the receive path, and
• wherein the compensation unit is configured to apply the generated compensation to the reference signal to generate a compensated reference signal;
• and
• a leakage suppression filter in the receive path, wherein the leakage suppression filter is configured to remove DC components in the output signal resulting from mixing the amplified signals with the compensated reference signal.

A method of cancelling transmitter leakage in a radar system, comprising:

• transmitting a transmit signal from a transmit path;
• receiving, by a receive path, at least a leakage from the transmit path;
• amplifying at least the leakage from the transmit path to generate an amplified signal;
• deriving a reference signal from the transmit path;
• mixing the amplified signal with the reference signal to generate an output signal at an intermediate frequency;
• deriving a delay corresponding to a leakage path between the transmit path and the receive path;
• generating a compensation for the derived delay;
• applying the generated compensation to the reference signal;
• and
• removing DC components from the output signal.