US 12,265,175 B2
Processing radar signals
Andre Roger, Munich (DE); Simon Achatz, Munich (DE); Dian Tresna Nugraha, Bandung (ID); Ljudmil Anastasov, Munich (DE); Markus Bichl, Feldkirchen-Westerham (DE); Mayeul Jeannin, Munich (DE); and Maximilian Eschbaumer, Munich (DE)
Assigned to Infineon Technologies AG, Neubiberg (DE)
Filed by Infineon Technologies AG, Neubiberg (DE)
Filed on May 19, 2021, as Appl. No. 17/324,675.
Claims priority of application No. 102020113678.1 (DE), filed on May 20, 2020; application No. 102020115709.6 (DE), filed on Jun. 15, 2020; and application No. 102020004411.5 (DE), filed on Jul. 22, 2020.
Prior Publication US 2021/0364596 A1, Nov. 25, 2021
Int. Cl. G01S 7/35 (2006.01); G01S 7/288 (2006.01); G01S 13/44 (2006.01); G01S 13/536 (2006.01); G01S 13/58 (2006.01); G01S 13/931 (2020.01)
CPC G01S 7/354 (2013.01) [G01S 7/2883 (2021.05); G01S 7/356 (2021.05); G01S 13/4436 (2013.01); G01S 13/536 (2013.01); G01S 13/584 (2013.01); G01S 13/931 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A radar system comprising:
a first antenna sub-array configured to receive a first plurality of antenna signals;
a second antenna sub-array configured to receive a second plurality of antenna signals;
a first signal processing circuit configured to receive the first plurality of antenna signals from the first antenna sub-array and perform processing thereon to form a first digitized antenna data set;
a second signal processing circuit configured to receive the second plurality of antenna signals from the second antenna sub-array and perform processing thereon to form a second digitized antenna data set;
a fast fourier transform (FFT) stage, comprising:
a first, first stage FFT device configured to receive the first digitized antenna data set and output first preliminary processed digitized antenna data;
a second, first stage FFT device configured to receive the second digitized antenna data set and output second preliminary processed digitized antenna data; and
a second stage FFT device configured to receive the first and second preliminary processed digitized antenna data and output FFT processed antenna data that comprises an interim result, and wherein the FFT processed antenna data contain phase errors therein due to phase errors between the first signal processing circuit and the second signal processing circuit, wherein the output FFT processed antenna data comprise a range/Doppler map for each of a plurality of virtual antennas, and wherein each range/Doppler map comprises FFT peaks;
an electronic control circuit configured to calculate an error compensation vector using the FFT processed antenna data and an expected characteristic in the calculating, wherein the expected characteristic is determined based on remote data or an intrinsic signal characteristic of at least one of the first and second received signals in one or several of a dimensions angle, range and Doppler range, and wherein the electronic control circuit is configured to apply the calculated error compensation vector to the FFT processed antenna data to generate compensated FFT processed antenna data,
wherein the electronic control circuit is further configured to select one or more FFT peaks from the compensated FFT processed antenna data.