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2026-01-21
Adapting Operational Volume Scanning to Low-Power FMCW: System Development and Physically-Informed ML Calibration
By
Progress In Electromagnetics Research B, Vol. 117, 29-42, 2026
Abstract
This study presents the development and evaluation of a transportable X-band frequency-modulated continuous-wave (FMCW) weather radar (WR) that successfully adapts operational volumetric scanning strategies typically reserved for high-power to low-power pulsed systems. The radar integrates a complete radio-frequency chain, a carbon graphite antenna, and a dedicated real-time processing unit designed for operational volumetric scanning. It performs rapid 4-minute volume scans across seven elevation angles (0.00˚-15.88˚) with non-uniform spacing optimized for low-level atmospheric sampling, while a 2 RPM rotation provides full azimuthal coverage every 30 s. The resulting Column Maximum (CMAX) product synthesizes reflectivity from all elevation angles to depict three-dimensional precipitation structure, demonstrating a spatial observational capability distinct from traditional profiling FMCW radars. A three-stage hierarchical physically-informed architecture calibration framework was implemented to ensure quantitative accuracy in the FMCW WRs measurements, using collocated C-band Doppler Weather Radar (CDWR) observations as reference data. Validation through internal five-fold Group K-Fold cross-validation, Leave-One-Pair-Out (LOPO) testing, and external evaluation using independent radar pairs demonstrated the frameworks robustness. The case study of localized urban convection observed by the FMCW WR shows that the developed low-cost radar offers much finer range resolution and can reveal detailed structures within convective cells.
Citation
Asif Awaludin, Dwiyanto, Rahmat Triyono, Yunus Subagyo Swarinoto, Erwin Makmur, Beno Kunto Pradekso, Oktanto Dedi Winarko, Muhammad Farras Archi Maggaukang, Liarto, Donaldi Sukma Permana, Roni Kurniawan, Rezky Yunita, Mohamad Husein Nurrahmat, Thahir Daniel Foreigner Hutapea, Agung Majid, Muhamad Rifki Taufik, Warjono, Ferdinandus Edwin Penalun, Bobby Harnawan, Dodi Dian Patriadi, Muhammad Rendi Anggara, Hastuadi Harsa, Alfan Sukmana Praja, Fatkhuroyan, Wido Hanggoro, Muhammad Najib Habibie, Welly Fitria, Rahayu Sapta Sri Sudewi, Asteria Satyaning Handayani, Sri Noviati, and Vestiana Aza, "Adapting Operational Volume Scanning to Low-Power FMCW: System Development and Physically-Informed ML Calibration," Progress In Electromagnetics Research B, Vol. 117, 29-42, 2026.
doi:10.2528/PIERB25111901
References

1. Antes, Theresa, Zsolt Kollár, Thomas Zwick, and Benjamin Nuss, "High-accuracy range estimation for FC-FMCW radar using phase evaluation in static scenarios," 2024 IEEE Radar Conference (RadarConf24), 1-6, Denver, CO, USA, May 2024.
doi:10.1109/RadarConf2458775.2024.10548517

2. Pazmany, Andrew L., James B. Mead, Howard B. Bluestein, Jeffrey C. Snyder, and Jana B. Houser, "A mobile rapid-scanning X-band polarimetric (RaXPol) Doppler radar system," Journal of Atmospheric and Oceanic Technology, Vol. 30, No. 7, 1398-1413, 2013.
doi:10.1175/jtech-d-12-00166.1        Google Scholar

3. Jankiraman, M., FMCW Radar Design, Artech House, 2018.

4. Aboserwal, Nafati, Jorge L. Salazar-Cerreno, and Zeeshan Qamar, "An ultra-compact X-band dual-polarized slotted waveguide array unit cell for large E-scanning radar systems," IEEE Access, Vol. 8, 210651-210662, 2020.
doi:10.1109/access.2020.3038485        Google Scholar

5. Uno, Takashi, Takashi Uesaka, Narihiro Nakamoto, Toru Fukasawa, Toru Takahashi, Yoshio Inasawa, Takeshi Yamamoto, Tomoyuki Koyanagi, Ikuya Kakimoto, and Yoshihiko Konishi, "Design of a dual-polarized low sidelobe slotted waveguide antenna for C-band phased array weather radar," 2022 IEEE International Symposium on Phased Array Systems & Technology (PAST), 1-4, Waltham, MA, USA, 2022.
doi:10.1109/PAST49659.2022.9975055

6. Awaludin, Asif, Josaphat Tetuko Sri Sumantyo, Koichi Ito, Steven Gao, Achmad Munir, Mohd Zafri Baharuddin, and Cahya Edi Santosa, "Equilateral triangular slot antenna for communication system and GNSS RO sensor of GAIA-I microsatellite," IEICE Transactions on Communications, Vol. E101-B, No. 3, 835-846, 2018.
doi:10.1587/transcom.2017ebp3183        Google Scholar

7. Awaludin, Asif, Josaphat Tetuko Sri Sumantyo, Cahya Edi Santosa, and Mohd Zafri Baharuddin, "Axial ratio enhancement of equilateral triangular-ring slot antenna using coupled diagonal line slots," Progress In Electromagnetics Research C, Vol. 70, 99-109, 2016.
doi:10.2528/pierc16102508        Google Scholar

8. Omar, Mohamad Faiz Mohamed, Asrulnizam Abd Manaf, Mohd Fadzil Ain, and Sharul Kamal Abdul Rahim, "A review on multi-geometrical antenna reflector," ELEKTRIKA --- Journal of Electrical Engineering, Vol. 23, No. 3, 77-83, 2024.
doi:10.11113/elektrika.v23n3.580        Google Scholar

9. Park, S. G., M. Maki, K. Iwanami, V. N. Bringi, and V. Chandrasekar, "Correction of radar reflectivity and differential reflectivity for rain attenuation at X band. Part II: Evaluation and application," Journal of Atmospheric and Oceanic Technology, Vol. 22, No. 11, 1633-1655, 2005.
doi:10.1175/jtech1804.1        Google Scholar

10. Pejcic, Velibor, Joshua Soderholm, Kai Mühlbauer, Valentin Louf, and Silke Trömel, "Five years calibrated observations from the University of Bonn X-band weather radar (BoXPol)," Scientific Data, Vol. 9, No. 1, 551, 2022.
doi:10.1038/s41597-022-01656-0        Google Scholar

11. Sinatra, Tiin, Ginaldi Ari Nugroho, Halimurrahman, Nani Cholianawati, Asri Indrawati, Findy Renggono, Erma Yulihastin, Sopia Lestari, Umar Ali Ahmad, Wahyu Widada, and Asif Awaludin, "Extreme precipitation over complex terrain using multiple remote sensing observation: A case study in the Great Bandung, Indonesia," Remote Sensing Applications: Society and Environment, Vol. 32, 101058, 2023.
doi:10.1016/j.rsase.2023.101058        Google Scholar

12. Leijnse, H., R. Uijlenhoet, C. Z. Van De Beek, A. Overeem, T. Otto, C. M. H. Unal, Y. Dufournet, H. W. J. Russchenberg, J. Figueras i Ventura, H. Klein Baltink, and I. Holleman, "Precipitation measurement at CESAR, The Netherlands," Journal of Hydrometeorology, Vol. 11, No. 6, 1322-1329, 2010.
doi:10.1175/2010jhm1245.1        Google Scholar

13. Salami, Dariush, Nima Bahmani, Hüseyin Yiğitler, and Stephan Sigg, "Adaptive internal calibration for temperature-robust mmWave FMCW radars," arXiv:2511.02884, 2025.
doi:10.48550/arXiv.2511.02884        Google Scholar

14. Joshil, Shashank S. and Chandra V. Chandrasekar, "Calibration of D3R weather radar using UAV-hosted target," Remote Sensing, Vol. 14, No. 15, 3534, 2022.
doi:10.3390/rs14153534        Google Scholar

15. Jorquera, Susana, Felipe Toledo Bittner, Julien Delanoë, Alexis Berne, Anne-Claire Billault-Roux, Alfons Schwarzenboeck, Fabien Dezitter, Nicolas Viltard, and Audrey Martini, "Calibration transfer methodology for cloud radars based on ice cloud observations," Journal of Atmospheric and Oceanic Technology, Vol. 40, No. 7, 773-788 , 2023.
doi:10.1175/jtech-d-22-0087.1        Google Scholar

16. Bringi, V. N. and V. Chandrasekar, Polarimetric Doppler Weather Radar: Principles and Applications, Cambridge University Press, 2001.

17. Shahpari, Morteza and David V. Thiel, "The impact of reduced conductivity on the performance of wire antennas," IEEE Transactions on Antennas and Propagation, Vol. 63, No. 11, 4686-4692, 2015.
doi:10.1109/tap.2015.2479241        Google Scholar

18. Doviak, Richard J. and Dusan S. Zrnic, Doppler Radar & Weather Observations, Academic Press, 2014.

19. Sinatra, T., A. Awaludin, F. Nauval, and C. Purnomo, "Calibration of spatial rain scanner using rainfall depth of rain gauges," IOP Conference Series: Earth and Environmental Science, Vol. 893, No. 1, 012064, 2021.
doi:10.1088/1755-1315/893/1/012064

20. Saadi, Mohamed, Carina Furusho-Percot, Alexandre Belleflamme, Silke Trömel, Stefan Kollet, and Ricardo Reinoso-Rondinel, "Comparison of three radar-based precipitation nowcasts for the extreme July 2021 flooding event in Germany," Journal of Hydrometeorology, Vol. 24, No. 7, 1241-1261, 2023.
doi:10.1175/jhm-d-22-0121.1        Google Scholar

21. Wei, Chih-Chiang and Chen-Chia Hsu, "Extreme gradient boosting model for rain retrieval using radar reflectivity from various elevation angles," Remote Sensing, Vol. 12, No. 14, 2203, 2020.
doi:10.3390/rs12142203        Google Scholar

22. Yin, Ye, Jun He, Jie Guo, Wenwen Song, Hao Zheng, and Jia Dan, "Enhancing precipitation estimation accuracy: An evaluation of traditional and machine learning approaches in rainfall predictions," Journal of Atmospheric and Solar-Terrestrial Physics, Vol. 255, 106175, 2024.
doi:10.1016/j.jastp.2024.106175        Google Scholar

23. Sanchez-Rivas, Daniel and Miguel A. Rico-Ramirez, "Calibration of radar differential reflectivity using quasi-vertical profiles," Atmospheric Measurement Techniques, Vol. 15, No. 2, 503-520, 2022.
doi:10.5194/amt-15-503-2022        Google Scholar

24. Yao, Yuanyuan, Wout De Swaef, Simon Geirnaert, and Alexander Bertrand, "EEG-based decoding of selective visual attention in superimposed videos," IEEE Journal of Biomedical and Health Informatics, Vol. 29, No. 10, 7248-7261, 2025.
doi:10.1109/jbhi.2025.3580261        Google Scholar

25. Oceanic, N. and A. A. (NOAA), "Jetstream: Reflectivity," https://www.noaa.gov/jetstream/reflectivity, 2023.

26. Toledo, Felipe, Julien Delanoë, Martial Haeffelin, Jean-Charles Dupont, Susana Jorquera, and Christophe Le Gac, "Absolute calibration method for frequency-modulated continuous wave (FMCW) cloud radars based on corner reflectors," Atmospheric Measurement Techniques, Vol. 13, No. 12, 6853–6875, 2020.
doi:10.5194/amt-13-6853-2020        Google Scholar

27. Myagkov, Alexander, Stefan Kneifel, and Thomas Rose, "Evaluation of the reflectivity calibration of W-band radars based on observations in rain," Atmospheric Measurement Techniques, Vol. 13, No. 11, 5799-5825, 2020.
doi:10.5194/amt-13-5799-2020        Google Scholar

28. Lengfeld, Katharina, Marco Clemens, Claire Merker, Hans Münster, and Felix Ament, "A simple method for attenuation correction in local X-band radar measurements using C-band radar data," Journal of Atmospheric and Oceanic Technology, Vol. 33, No. 11, 2315-2329, 2016.
doi:10.1175/jtech-d-15-0091.1        Google Scholar

29. Nugroho, Ginaldi Ari, Halimurrahman, Asif Awaludin, Ibnu Fathrio, Nurjanna Joko Trilaksono, Edy Maryadi, Tiin Sinatra, Findy Renggono, Didi Satiadi, Erwin Makmur, et al. "A 4-years of radar-based observation of bow echo over Bandung Basin Indonesia," Geoenvironmental Disasters, Vol. 11, No. 1, 19, 2024.
doi:10.1186/s40677-024-00282-9        Google Scholar