US 11,579,284 B2 · In phase (I) and quadrature (Q) imbalance estimation in a radar system

Abstract

A radar system is provided that includes transmission signal generation circuitry, a transmit channel coupled to the transmission generation circuitry to receive a continuous wave test signal, the transmit channel configurable to output a test signal based on the continuous wave signal in which a phase angle of the test signal is changed in discrete steps within a phase angle range, a receive channel coupled to the transmit channel via a feedback loop to receive the test signal, the receive channel including an in-phase (I) channel and a quadrature (Q) channel, a statistics collection module configured to collect energy measurements of the test signal output by the I channel and the test signal output by the Q channel at each phase angle, and a processor configured to estimate phase and gain imbalance of the I channel and the Q channel based on the collected energy measurements.

Claims20

Dependent claims

A system comprising:

a set of transmit paths each configured to couple to a respective antenna, wherein a first transmit path of the set of transmit paths includes a phase shifter configured such that the first transmit path is configured to provide a test signal that includes signal portions at each phase of a set of phases;
a loopback path coupled to the first transmit path;
a set of receive paths each coupled to the loopback path and configured to couple to a respective antenna, wherein each receive path of the set of receive paths is configured to:
receive the test signal;
provide a respective in-phase response to the test signal;
and
provide a respective quadrature response to the test signal;
and
a control module coupled to the set of receive paths and configured to, for each receive path of the set of receive paths, determine at least one of:
a phase imbalance or a gain imbalance for the respective receive path based on the respective in-phase response and the respective quadrature response.

7 more elements

A method comprising:

receiving, at a set of receive paths, a test signal that includes a set of signal portions, each having a respective phase that is different from a remainder of the set of signal portions;
receiving, at the set of receive paths, a reference signal;
for each receive path of the set of receive paths, mixing the test signal with the reference signal to generate a respective in-phase response and a respective quadrature response to the test signal;
and
for each receive path of the set of receive paths, determining at least one of:
a gain imbalance or a phase imbalance of the respective receive path based on the respective in-phase response and the respective quadrature response.

3 more elements

Dependencies are inferred from the claim text.

In phase (I) and quadrature (Q) imbalance estimation in a radar system

Life of this patent

In phase (I) and quadrature (Q) imbalance estimation in a radar system

Life of this patent

Abstract

Claims20