radioelectronicsИзвестия высших учебных заведений России. РадиоэлектроникаJournal of the Russian Universities. Radioelectronics1993-89852658-4794Saint Petersburg Electrotechnical University10.32603/1993-8985-2021-24-4-19-26radioelectronics-538Research ArticleРАДИОТЕХНИЧЕСКИЕ СРЕДСТВА ПЕРЕДАЧИ, ПРИЕМА И ОБРАБОТКИ СИГНАЛОВRADIO ELECTRONIC FACILITIES FOR SIGNAL TRANSMISSION, RECEPTION AND PROCESSINGImproving the Structure of a Signal Used for Real-Time Calibrating of the Receiving Channels of Digital Transceiver Modules in Digital Phased Antenna ArraysImproving the Structure of a Signal Used for Real-Time Calibrating of the Receiving Channels of Digital Transceiver Modules in Digital Phased Antenna ArraysVietHung TranVietHung Tran

Viet Hung Tran, an Engineer specializing in Radar Systems, 2010, defended a Master's thesis in System Engineering and Control Automation, 2016. A specialist in systems engineering, radio-electronic and radar technology.

236 Hoang Quoc Viet St., Hanoi

hung.isi@lqdtu.edu.vnMinhThien HoangMinhThien Hoang

Minh Thien Hoang, an Engineer specializing in Radar Systems, 2005; defended a Master's thesis in Systems Engineering and Control Automation, 2008; defended a doctoral dissertation in the specialty Microelectronic Technology at TU Electronics and Communication Tokyo, (2015).

236 Hoang Quoc Viet St., Hanoi

thienhm.isi@lqdtu.edu.vnLe Quy Don Technical UniversityВьетнамLe Quy Don Technical UniversityViet Nam2021280920212441926Copyright © Viet H.T., Minh T.H., 20212021Viet H.T., Minh T.H.Viet H.T., Minh T.H.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://re.eltech.ru/jour/article/view/538

Introduction. Modern digital phased array antenna (DPAA) systems incorporate a large number of identical transceiver modules (TMs). These modules require real-time calibration with a high level of accuracy. In a previous work, we proposed a real-time calibration method for all receiver channels, which is based on the use of a calibration signal (CalSig) of the same frequency spectrum as the reflected signal and modulated in phase and amplitude by BPSK and OOK codes, respectively. This method was found to have a number of advantages over conventional approaches. However, the use of the same CalSig sample for all receiving channels increases the noise power gain at the output of a digital beam-forming unit (DBU). To overcome this limitation, we set out to improve the structure of CalSigs by making them pseudo-orthogonal. As a result, the noise power gain at the DBU output can be significantly reduced compared to that obtained in our previous work.Aim. To propose an improved design of a controlled amplitude modulation code OOK generator, which allows creation of pseudo-orthogonal CalSigs. As a result, the noise power gain at the output will increase insignificantly, thus having no negative effect on the quality of digital beam forming, signal processing and calibration.Materials and methods. Theory of system engineering and technology; theory of digital signal processing; system analysis; mathematical modeling.Results. An improved CalSig for calibrating the receiving channels of TMs was obtained. A structural diagram allowing the formation of pseudo-orthogonal CalSigs was synthesized.Conclusions. We proposed a new approach to improving the structure of signals used for real-time calibrating the DPAA receiving channels. A structural diagram of an amplitude-modulated OOK code generator for pseudo-orthogonal CalSigs was developed.

Introduction. Modern digital phased array antenna (DPAA) systems incorporate a large number of identical transceiver modules (TMs). These modules require real-time calibration with a high level of accuracy. In a previous work, we proposed a real-time calibration method for all receiver channels, which is based on the use of a calibration signal (CalSig) of the same frequency spectrum as the reflected signal and modulated in phase and amplitude by BPSK and OOK codes, respectively. This method was found to have a number of advantages over conventional approaches. However, the use of the same CalSig sample for all receiving channels increases the noise power gain at the output of a digital beam-forming unit (DBU). To overcome this limitation, we set out to improve the structure of CalSigs by making them pseudo-orthogonal. As a result, the noise power gain at the DBU output can be significantly reduced compared to that obtained in our previous work.Aim. To propose an improved design of a controlled amplitude modulation code OOK generator, which allows creation of pseudo-orthogonal CalSigs. As a result, the noise power gain at the output will increase insignificantly, thus having no negative effect on the quality of digital beam forming, signal processing and calibration.Materials and methods. Theory of system engineering and technology; theory of digital signal processing; system analysis; mathematical modeling.Results. An improved CalSig for calibrating the receiving channels of TMs was obtained. A structural diagram allowing the formation of pseudo-orthogonal CalSigs was synthesized.Conclusions. We proposed a new approach to improving the structure of signals used for real-time calibrating the DPAA receiving channels. A structural diagram of an amplitude-modulated OOK code generator for pseudo-orthogonal CalSigs was developed.

digital phased array antennareal-time internal calibrationcalibration signaltransceiver moduledigital beamformingintegrated calibration subsystemReferencesYounis M., Rommelet T., de Almeida F. Q., Huber S., Martone M., Krieger G., Villano M. Investigations on the internal calibration of multi-channel SAR. 2017 IEEE Intern. Geoscience and Remote Sensing Symp. (IGARSS), 2017, pp. 5386-5389. doi: 10.1109/IGARSS.2017.8128221Younis M., Rommelet T., de Almeida F. Q., Huber S., Martone M., Krieger G., Villano M. Investigations on the internal calibration of multi-channel SAR. 2017 IEEE Intern. Geoscience and Remote Sensing Symp. (IGARSS), 2017, pp. 5386-5389. doi: 10.1109/IGARSS.2017.8128221Kim D.-Ch., Park S.-Jin, Kim T.-W., Minz L., Park S.-O. Fully Digital Beamforming Receiver With a Real-Time Calibration for 5G Mobile Communication. IEEE Transactions on Antennas and Propagation. 2019, vol. 67, no. 6, pp. 3809-3819. doi: 10.1109/TAP.2019.2902712Kim D.-Ch., Park S.-Jin, Kim T.-W., Minz L., Park S.-O. Fully Digital Beamforming Receiver With a Real-Time Calibration for 5G Mobile Communication. IEEE Transactions on Antennas and Propagation. 2019, vol. 67, no. 6, pp. 3809-3819. doi: 10.1109/TAP.2019.2902712Hoffman J. P., Veilleux L., Perkovic D., Peral E., Shaffer S. Digital calibration of TR modules for real-time digital beamforming SweepSAR architectures. IEEE Aerospace Conf., Big Sky, USA, MT, 2012, pp. 1-8. doi: 10.1109/AERO.2012.6187084Hoffman J. P., Veilleux L., Perkovic D., Peral E., Shaffer S. Digital calibration of TR modules for real-time digital beamforming SweepSAR architectures. IEEE Aerospace Conf., Big Sky, USA, MT, 2012, pp. 1-8. doi: 10.1109/AERO.2012.6187084Horst S. J., Hoffman J. P., Perkovic-Martin D., Shaffer S., Thrivikraman T., Yates Ph., Veilleuxet L. Implementation of RF circuitry for real-time digital beamforming SAR calibration schemes. Radar Systems (Radar 2012), IET Intern. Conf., pp. 1-6.Horst S. J., Hoffman J. P., Perkovic-Martin D., Shaffer S., Thrivikraman T., Yates Ph., Veilleuxet L. Implementation of RF circuitry for real-time digital beamforming SAR calibration schemes. Radar Systems (Radar 2012), IET Intern. Conf., pp. 1-6.Hoffman J. P., Horst S., Perkovic D., Shaffer S., Ghaemi H., Veilleux L. Advances in digital calibration techniques enabling real-time beamforming SweepSAR architectures. IEEE Aerospace Conf., Big Sky, USA, MT, 2013. pp. 1-9. doi: 10.1109/AERO.2013.6497146Hoffman J. P., Horst S., Perkovic D., Shaffer S., Ghaemi H., Veilleux L. Advances in digital calibration techniques enabling real-time beamforming SweepSAR architectures. IEEE Aerospace Conf., Big Sky, USA, MT, 2013. pp. 1-9. doi: 10.1109/AERO.2013.6497146Hoffman J. P., Horst S., Veilleux L., Ghaemi H., Shaffer S. Digital calibration system enabling real-time on-orbit beamforming. IEEE Aerospace Conf., Big Sky, USA MT, 2014, pp. 1-11. doi: 10.1109/AERO.2014.6836218Hoffman J. P., Horst S., Veilleux L., Ghaemi H., Shaffer S. Digital calibration system enabling real-time on-orbit beamforming. IEEE Aerospace Conf., Big Sky, USA MT, 2014, pp. 1-11. doi: 10.1109/AERO.2014.6836218Jens Reimann, Technique for Concurrent Internal Calibration during Data Acquisition for SAR Systems. Remote Sens. 2020, vol. 12(11), iss. 1773, pp. 1-9. doi: 10.3390/rs12111773Jens Reimann, Technique for Concurrent Internal Calibration during Data Acquisition for SAR Systems. Remote Sens. 2020, vol. 12(11), iss. 1773, pp. 1-9. doi: 10.3390/rs12111773Lin Y., Ma Q., Wang S., Bu X., An J. Calibration for spaceborne phased array antennas without interrupting satellite communications. Proc. 9th WCSP, China, 2017, pp. 1-5. doi: 10.1109/WCSP.2017.8171093Lin Y., Ma Q., Wang S., Bu X., An J. Calibration for spaceborne phased array antennas without interrupting satellite communications. Proc. 9th WCSP, China, 2017, pp. 1-5. doi: 10.1109/WCSP.2017.8171093Hung Tran Viet, Thien Hoang Minh. A real-time internal alibration method for radar systems using digital phase array antennas. INISCOM 2021, LNICST 379, pp. 88–103. doi: 10.1007/978-3-030-77424-0_8Hung Tran Viet, Thien Hoang Minh. A real-time internal alibration method for radar systems using digital phase array antennas. INISCOM 2021, LNICST 379, pp. 88–103. doi: 10.1007/978-3-030-77424-0_8Florian RUPPIN. Probability and Statistics Basic concepts. Available at: http://www.mit.edu/~ruppin/Lecture_ESIPAP_Ruppin_2018.pdf (accessed 15.09.2021)Florian RUPPIN. Probability and Statistics Basic concepts. Available at: http://www.mit.edu/~ruppin/Lecture_ESIPAP_Ruppin_2018.pdf (accessed 15.09.2021)Brautigam B., Schwerdt M., Bachmann M., Stangl M. Individual T/R module characterisation of the TerraSAR-X active phased array antenna by calibration pulse sequences with orthogonal codes. IEEE Intern. Geoscience and Remote Sensing Symp., 2007, pp. 5202-5205. doi: 10.1109/IGARSS.2007.4424034Brautigam B., Schwerdt M., Bachmann M., Stangl M. Individual T/R module characterisation of the TerraSAR-X active phased array antenna by calibration pulse sequences with orthogonal codes. IEEE Intern. Geoscience and Remote Sensing Symp., 2007, pp. 5202-5205. doi: 10.1109/IGARSS.2007.4424034Silverstein S. D. Application of orthogonal codes to the calibration of active phased array antennas for communication satellites. IEEE Transactions on Signal Processing. 1997, vol. 45, no. 1, pp. 206-218.Silverstein S. D. Application of orthogonal codes to the calibration of active phased array antennas for communication satellites. IEEE Transactions on Signal Processing. 1997, vol. 45, no. 1, pp. 206-218.Surface Mount. Phase Shifter. JSPHS-23+. Available at: https://www.minicircuits.com/pdfs/JSPHS-23+.pdf (accessed 10.07.2021)Surface Mount. Phase Shifter. JSPHS-23+. Available at: https://www.minicircuits.com/pdfs/JSPHS-23+.pdf (accessed 10.07.2021)Yu-Tsung Lo, Chau-Chan Yui, Jean-Fu Kiang. OOK/BPSK-Modulated Impulse Transmitters Integrated With Leakage-Cancelling Circuit. IEEE Transactions on Microwave Theory and Techniques. 2013, vol. 61, no. 1, pp. 218-224. doi: 10.1109/TMTT.2012.2226746Yu-Tsung Lo, Chau-Chan Yui, Jean-Fu Kiang. OOK/BPSK-Modulated Impulse Transmitters Integrated With Leakage-Cancelling Circuit. IEEE Transactions on Microwave Theory and Techniques. 2013, vol. 61, no. 1, pp. 218-224. doi: 10.1109/TMTT.2012.2226746Surface Mount. Switch. MSW-2-20+. Available at: https://www.minicircuits.com/pdfs/MSW-2-20+.pdf (accessed 10.07.2021)Surface Mount. Switch. MSW-2-20+. Available at: https://www.minicircuits.com/pdfs/MSW-2-20+.pdf (accessed 10.07.2021)

The authors declare that there are no conflicts of interest present.