| CPC G01S 7/40 (2013.01) [G01S 13/931 (2013.01); H01Q 3/267 (2013.01); B60W 10/00 (2013.01); B60W 2420/408 (2024.01)] | 20 Claims |
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1. A radar calibration system for calibrating a radar system, the system comprising:
the radar system including a phased array antenna including a first antenna array and a second antenna array, a transmitter array, and a receiver array, a plurality of communication leads, a calibration circuit, and a controller;
wherein the transmitter array is in communication with the first antenna array;
wherein the receiver array is in communication with the second antenna array;
wherein the receiver array includes a plurality of receivers;
wherein the second antenna array includes a plurality of receive antennas;
wherein the plurality of receive antennas communicates with the plurality of receivers via the plurality of communication leads;
the calibration circuit including a power divider and a plurality of directional couplers, wherein each of the plurality of directional couplers includes a first transmission link arranged proximal to a second transmission link; and the power divider includes an input lead and a plurality of output leads;
wherein the input lead is connectable to an output of one of a plurality of transmitters of the transmitter array;
wherein one of the plurality of output leads of the power divider is connected to the first transmission link of the directional coupler; and
wherein each of the second transmission links of the plurality of directional couplers is connected in series between one of the plurality of receive antennas and one of the receivers of the receiver array; and
the controller arranged to communicate with the transmitter array, the receiver array, and the calibration circuit, the controller including an instruction set, the instruction set executable to:
inject, via the power divider and the plurality of directional couplers, a pilot signal to the plurality of receivers during a quiet period;
designate one of the plurality of receivers as a reference channel;
determine a plurality of phase offsets and a plurality of gain imbalances for the plurality of receivers in relation to the reference channel based upon the pilot signal;
determine a plurality of phase calibrations and a plurality of gain calibrations for the plurality of receivers based upon the plurality of phase offsets and the plurality of gain imbalances;
determine a radar-related parameter based upon the plurality of phase calibrations and the plurality of gain calibrations for the plurality of receivers; and
control operation of the radar system based upon the radar-related parameter.
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