US 11,668,796 B2
Radar system and method for determining at least one calibration parameter for a radar system
Philipp Scherz, Linz (AT); Markus Josef Lang, Pfarrkirchen (AT); and Roland Vuketich, Arbing (AT)
Assigned to Infineon Technologies AG, Neubiberg (DE)
Filed by Infineon Technologies AG, Neubiberg (DE)
Filed on Nov. 17, 2020, as Appl. No. 16/950,287.
Claims priority of application No. 102019131585.9 (DE), filed on Nov. 22, 2019.
Prior Publication US 2021/0156959 A1, May 27, 2021
Int. Cl. G01S 7/40 (2006.01); G01S 7/35 (2006.01)
CPC G01S 7/4021 (2013.01) [G01S 7/352 (2013.01); G01S 7/4008 (2013.01); G01S 7/4017 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for determining at least one calibration parameter for a radar system with a first radar transceiver and a second radar transceiver, the method comprising:
performing a first calibration measurement comprising the following:
generating a first frequency-modulated oscillation signal via the first radar transceiver based on frequency ramp parameters that characterize a frequency ramp;
applying the first frequency-modulated oscillation signal to a first terminal of the first radar transceiver, the first terminal being connected to a second terminal of the second radar transceiver via a signal line;
generating a second frequency-modulated oscillation signal via the second radar transceiver based on the frequency ramp parameters; and
combining the first frequency-modulated oscillation signal received via the second terminal with the second frequency-modulated oscillation signal via the second radar transceiver to generate a first difference signal having a first frequency difference between the first frequency-modulated oscillation signal and the second frequency-modulated oscillation signal;
performing a second calibration measurement which comprises the following:
generating the second frequency-modulated oscillation signal via the second radar transceiver based on the frequency ramp parameters;
applying the second frequency-modulated oscillation signal to the second terminal;
generating the first frequency-modulated oscillation signal via the first radar transceiver based on the frequency ramp parameters; and
combining the second frequency-modulated oscillation signal received via the first terminal with the first frequency-modulated oscillation signal via the first radar transceiver to generate a second difference signal having a second frequency difference between the first frequency-modulated oscillation signal and the second frequency-modulated oscillation signal; and
determining the at least one calibration parameter,
wherein the at least one calibration parameter includes a signal propagation time over the signal line, and
wherein determining the signal propagation time comprises:
deriving a first analytical signal from the first difference signal;
deriving a second analytical signal from the second difference signal;
multiplying the first analytical signal by the second analytical signal to obtain a first combined signal;
determining a first frequency peak in the first combined signal; and
determining the signal propagation time based on a frequency of the first frequency peak and a gradient of the frequency ramp.