Mutual Coupling and Channel Imbalance Calibration of Colocated MIMO Radars
The Multiple-Input Multiple-Output (MIMO) radar combines the signals from multiple transmit and receive elements separately to form a virtual array. Consequently, system imperfections in the MIMO radar caused by channel imbalance and mutual coupling are repeatedly present in the virtual array, affec...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IEEE
2022-01-01
|
| Series: | IEEE Open Journal of Antennas and Propagation |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/9763833/ |
| _version_ | 1828795480749899776 |
|---|---|
| author | Ricard L. Grove Jorgen Dall Poul Leth-Espensen |
| author_facet | Ricard L. Grove Jorgen Dall Poul Leth-Espensen |
| author_sort | Ricard L. Grove |
| collection | DOAJ |
| description | The Multiple-Input Multiple-Output (MIMO) radar combines the signals from multiple transmit and receive elements separately to form a virtual array. Consequently, system imperfections in the MIMO radar caused by channel imbalance and mutual coupling are repeatedly present in the virtual array, affecting the beamforming performance. In this paper, the beam pattern deviations caused by these imperfections are described mathematically in relation to a single point target. Furthermore, a nonparametric calibration technique to estimate and compensate for these effects at different angles is presented by exploiting that the same imperfections are present multiple times in the virtual array. The proposed calibration method is applied to measurements with an 8 <inline-formula> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> 8 colocated X-band MIMO radar, and the peak sidelobe level (PSL) and the integrated sidelobe level (ISL) are used as performance parameters. The calibration technique is found to improve both the PSL and the ISL by approximately 15 dB within the whole field-of-view (FOV) for antennas that are not minimum scatterers. For angles above ±30° from the antenna boresight, the performance of the proposed calibration method is found to surpass other calibration methods. This is advantageous for MIMO radars as they typically cover a wide FOV. |
| first_indexed | 2024-12-12T04:05:54Z |
| format | Article |
| id | doaj.art-39446ed4e83a4b649c7918df489e6491 |
| institution | Directory Open Access Journal |
| issn | 2637-6431 |
| language | English |
| last_indexed | 2024-12-12T04:05:54Z |
| publishDate | 2022-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of Antennas and Propagation |
| spelling | doaj.art-39446ed4e83a4b649c7918df489e64912022-12-22T00:38:47ZengIEEEIEEE Open Journal of Antennas and Propagation2637-64312022-01-01351152210.1109/OJAP.2022.31707959763833Mutual Coupling and Channel Imbalance Calibration of Colocated MIMO RadarsRicard L. Grove0https://orcid.org/0000-0002-3635-8659Jorgen Dall1https://orcid.org/0000-0002-3873-1074Poul Leth-Espensen2Technical University of Denmark, DTU Space, Kongens Lyngby, DenmarkTechnical University of Denmark, DTU Space, Kongens Lyngby, DenmarkTechnology & Innovation, TERMA A/S, Lystrup, DenmarkThe Multiple-Input Multiple-Output (MIMO) radar combines the signals from multiple transmit and receive elements separately to form a virtual array. Consequently, system imperfections in the MIMO radar caused by channel imbalance and mutual coupling are repeatedly present in the virtual array, affecting the beamforming performance. In this paper, the beam pattern deviations caused by these imperfections are described mathematically in relation to a single point target. Furthermore, a nonparametric calibration technique to estimate and compensate for these effects at different angles is presented by exploiting that the same imperfections are present multiple times in the virtual array. The proposed calibration method is applied to measurements with an 8 <inline-formula> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> 8 colocated X-band MIMO radar, and the peak sidelobe level (PSL) and the integrated sidelobe level (ISL) are used as performance parameters. The calibration technique is found to improve both the PSL and the ISL by approximately 15 dB within the whole field-of-view (FOV) for antennas that are not minimum scatterers. For angles above ±30° from the antenna boresight, the performance of the proposed calibration method is found to surpass other calibration methods. This is advantageous for MIMO radars as they typically cover a wide FOV.https://ieeexplore.ieee.org/document/9763833/Multiple-input multiple-output~(MIMO)radar systemcalibrationchannel imbalancemutual couplingcolocated |
| spellingShingle | Ricard L. Grove Jorgen Dall Poul Leth-Espensen Mutual Coupling and Channel Imbalance Calibration of Colocated MIMO Radars IEEE Open Journal of Antennas and Propagation Multiple-input multiple-output~(MIMO) radar system calibration channel imbalance mutual coupling colocated |
| title | Mutual Coupling and Channel Imbalance Calibration of Colocated MIMO Radars |
| title_full | Mutual Coupling and Channel Imbalance Calibration of Colocated MIMO Radars |
| title_fullStr | Mutual Coupling and Channel Imbalance Calibration of Colocated MIMO Radars |
| title_full_unstemmed | Mutual Coupling and Channel Imbalance Calibration of Colocated MIMO Radars |
| title_short | Mutual Coupling and Channel Imbalance Calibration of Colocated MIMO Radars |
| title_sort | mutual coupling and channel imbalance calibration of colocated mimo radars |
| topic | Multiple-input multiple-output~(MIMO) radar system calibration channel imbalance mutual coupling colocated |
| url | https://ieeexplore.ieee.org/document/9763833/ |
| work_keys_str_mv | AT ricardlgrove mutualcouplingandchannelimbalancecalibrationofcolocatedmimoradars AT jorgendall mutualcouplingandchannelimbalancecalibrationofcolocatedmimoradars AT poullethespensen mutualcouplingandchannelimbalancecalibrationofcolocatedmimoradars |