SOLUTIONS TO REDUCE THE CORROLATION BETWEEN LEAKAGE SIGNAL WITH CALIBRATION SIGNAL IN THE INTERNAL CALIBRATION OF THE DIGITAL PHASED ARRAY ANTENNA SYSTEM
215 viewsDOI:
https://doi.org/10.54939/1859-1043.j.mst.75.2021.30-35Keywords:
Phased array antenna calibration; Internal calibration; Calibration signal; Isolation in internal calibration.Abstract
Real-time internal calibration method for digital phased array antenna system is being studied and widely applied. But this method also has signal leakage in the module which causes large errors in calibration and is a big challenge when calibration with high accuracy is required. The article proposes a solution to create and distribute the calibration signal (CalSig) for channels in receiver calibration in order to reduce the correlation between the leakage signal and CalSig, and increase the accuracy in calibration. By generating a different set of CalSigs and pairing the two modules into a pair in the receive calibration, the CalSig from one module will be extracted to the other. This solution overcomes the requirement for high isolation between leakage signal and CalSig. The effectiveness of the proposal is proven through simulation, the results show that the proposal is highly effective.
References
[1]. S. H. Talisa, K. W. O'Haver, Comberiate, M. D. Sharp and Somerlock, "Benefits of Digital Phased Array Radars," Proceedings of the IEEE, Vol. 104, No. 6 (2016), pp. 530-543.
[2]. Ilgın Seker, "Calibration methods for phased array radars," Proc. SPIE 8714, Radar Sensor Technology XVII, Maryland (2013), pp. 1-16.
[3]. D. Kim, S. Park, T. Kim, L. Minz and S. Park, "Fully Digital Beamforming Receiver With a Real-Time Calibration for 5G Mobile Communication," IEEE Transactions on Antennas and Propagation, Vol. 67, No. 6 (2019), pp. 3809-3819.
[4]. S. J. Horst et al., "Implementation of RF circuitry for real-time digital beam-forming SAR calibration schemes," IET International Conference on Radar Systems, Glas (2012), pp. 1-6.
[5]. J. P. Hoffman et al., "Advances in digital calibration techniques enabling real-time beamforming SweepSAR architectures," IEEE Aerospace Conference, USA (2013), pp. 1-9.
[6]. J. P. Hoffman et al.,"Digital calibration of TR modules for real-time digital beamforming SweepSAR architectures," IEEE Aerospace Conference, USA (2012), pp. 1-8.
[7]. J. P. Hoffman et al., "Digital calibration system enabling real-time on-orbit beamforming," IEEE Aerospace Conference, USA (2014), pp. 1-11.
[8]. C. Fulton et al., "Digital Phased Arrays: Challenges and Opportunities," Proceedings of the IEEE, Vol. 104, No. 3 (2016), pp. 487-503.
[9]. https://rpubs.com/nguyenngocbinhneu/432206, truy cập ngày 05 tháng 9 năm 2021.
[10]. T. Thrivikraman et al., "A compact two-stage 120W GaN high power amplifier for SweepSAR radar systems," IEEE Aerospace Conference, USA (2014), pp. 1-10.
[11]. M. Longbrake et al., "Digital beamforming using highly integrated receiver-on-chip modules," IEEE International Symposium on Phased Array Systems and Technology, USA (2010), pp. 196-201.
[12]. Hung Tran Viet, Thien Hoang Minh, "A real-time internal calibration method for radar systems using digital phased array antennas," 7th EAI International Conference (INISCOM 2021), Hanoi (2021), pp. 88–103.
