US 12,153,146 B2
Calibrating a vehicle-mounted GNSS antenna
Thomas Kaufmann, Thalwil (CH)
Assigned to u-blox AG, Thalwil (CH)
Filed by u-blox AG, Thalwil (CH)
Filed on Jan. 21, 2022, as Appl. No. 17/581,024.
Claims priority of application No. 21154448 (EP), filed on Jan. 29, 2021.
Prior Publication US 2022/0244405 A1, Aug. 4, 2022
Int. Cl. G01S 19/40 (2010.01); G01S 19/23 (2010.01)
CPC G01S 19/40 (2013.01) [G01S 19/23 (2013.01); G01S 19/235 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method of calibrating a vehicle-mounted global navigation satellite system (GNSS) antenna, the method comprising:
measuring a plurality of phases of the antenna, while mounted on the vehicle, for each of a first plurality of angles in a first angular dimension, and for each of a second plurality of angles in a second angular dimension;
generating unwrapped phases for each phase of the plurality of phases;
calculating a phase center offset of the antenna using one or more of the generated unwrapped phases, each of the first plurality of angles, each of the second plurality of angles, and a desired frequency band;
calculating, for at least one frequency of interest, phase center variations with respect to the first and second angular dimensions, the phase center variations calculated based on the one or more of the generated unwrapped phases; and
calculating, based on the measured plurality of phases of the antenna, a group delay variation of the antenna, with respect to the first and second angular dimensions.