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Soil Water Content Estimation Over Plantation Area Using FMCW Radar

By Fildha Ridhia, Aloysius Adya Pramudita, and Fiky Yosef Suratman
Progress In Electromagnetics Research B, Vol. 101, 155-173, 2023


In plantation areas, soil conditions affect the crop's quality. One of the crucial elements in the soil for plant survival is soil water content (SWC). Radar system has advantages that can be implemented for measuring SWC in plantation areas. A radar system operates by utilizing electromagnetic waves to obtain the dielectric characteristics of the soil. However, the presence of tea plants has become an obstacle to the radar wave propagation toward the soil layer. Reflected signal, which is influenced by the presence of vegetation, makes the estimation of SWC inaccurate. Consequently, the estimation of SWC needs to consider the vegetation's effect. This study uses an FMCW radar system, which operates at a frequency of 24 GHz. A layer medium propagation model is proposed in this study to prove the relationship between the reflected signal and the SWC. The reflection coefficient extracted from the radar signal is used to estimate the SWC. The vegetation propagation constant was obtained from the average field measurement results. The gravimetric method is used to validate the SWC estimation in vegetation's presence using the radar system. The results of the field experiments showed that the proposed method succeeded in estimating the SWC by considering the presence of vegetation with an average error of 3.57%. The proposed method has the potential to be applied to plantation areas.


Fildha Ridhia, Aloysius Adya Pramudita, and Fiky Yosef Suratman, "Soil Water Content Estimation Over Plantation Area Using FMCW Radar," Progress In Electromagnetics Research B, Vol. 101, 155-173, 2023.


    1. Passioura, J. B., "Soil conditions and plant growth," Plant, Cell and Environment, Vol. 25, No. 2, 311-318, 2002.

    2. Loynachan, T. E., et al., "Sustaining our soils and society," American Geological Institute, 1999.

    3. Leopold, A. C. and P. E. Kriedemann, Plant Growth and Development, Tata McGraw-Hill, 1975.

    4. Huisman, J. A., S. S. Hubbard, J. D. Redman, and A. P. Annan, "Measuring soil water content with ground penetrating radar: A review," Vadose Zone Journal, Vol. 2, No. 4, 476-491, 2003.

    5. Lal, R. and M. Shukla, Soil Water Evaporation, Marcel Dekker Inc., 2004.

    6. Pramudita, A. and L. Sari, "Extraction model of soil water content information based on least square method for GPR," 2016 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS), 1-5, IEEE, 2016.

    7. You, K. Y., J. Salleh, Z. Abbas, and L. You, "A rectangular patch antenna technique for the determination of moisture content in soil," PIERS Online, 850-854, 2010.

    8. Ghazali, M. F., K. Wikantika, A. B. Harto, and A. Kondoh, "Generating soil salinity, soil moisture, soil ph from satellite imagery and its analysis," Information Processing in Agriculture, Vol. 7, No. 2, 294-306, 2020.

    9. Zhao, T., L. Hu, J. Shi, H. Lu, S. Li, D. Fan, P. Wang, D. Geng, C. S. Kang, and Z. Zhang, "Soil moisture retrievals using L-band radiometry from variable angular ground-based and airborne observations," Remote Sensing of Environment, Vol. 248, 111958, 2020.

    10. Qiu, J., W. T. Crow, W. Wagner, and T. Zhao, "Effect of vegetation index choice on soil moisture retrievals via the synergistic use of synthetic aperture radar and optical remote sensing," International Journal of Applied Earth Observation and Geoinformation, Vol. 80, 47-57, 2019.

    11. Leao, T. P., B. F. D. da Costa, V. B. Bufon, and F. F. H. Aragon, "Using time domain reflectometry to estimate water content of three soil orders under savanna in brazil," Geoderma Regional, Vol. 21, e00280, 2020.

    12. Robinet, J., C. von Hebel, G. Govers, J. van der Kruk, J. P. Minella, A. Schlesner, Y. Ameijeiras- Marino, and J. Vanderborght, "Spatial variability of soil water content and soil electrical conductivity across scales derived from electromagnetic induction and time domain reflectometry,", Vol. 314, 160-174, 2018.

    13. Klotzsche, A., F. Jonard, M. C. Looms, J. van der Kruk, and J. A. Huisman, "Measuring soil water content with ground penetrating radar: A decade of progress," Vadose Zone Journal, Vol. 17, No. 1, 1-9, 2018.

    14. Liu, X., J. Chen, X. Cui, Q. Liu, X. Cao, and X. Chen, "Measurement of soil water content using ground-penetrating radar: A review of current methods," International Journal of Digital Earth, Vol. 12, No. 1, 95-118, 2019.

    15. Daniels, J. J., D. J. Guntun, and H. F. Scott, "Introduction to subsurface radar," IEE Proc. F Commun. Radar Signal Process., 278-320, 1988.

    16. Rohman, B. P. A. and M. Nishimoto, "Near-surface soil water content estimation using UWB-GPR based on selective sparse representation," 2018 IEEE Sensors Applications Symposium, SAS 2018 --- Proceedings, 1-5, IEEE, 2018.

    17. Immoreev, I. I. and P. D. V. Fedotov, "Ultra wideband radar systems: Advantages and disadvantages," 2002 IEEE Conference on Ultra Wideband Systems and Technologies (IEEE Cat. No. 02EX580), 201-205, IEEE, 2002.

    18. Skolnik, M. I., Radar Hanbook, The McGraw-Hill, 1990.

    19. Lombardi, F. and M. Lualdi, "Step-frequency ground penetrating radar for agricultural soil morphology characterisation," Remote Sensing, Vol. 11, No. 9, 1075, 2019.

    20. Lambot, S., J. Rhebergen, I. van den Bosch, E. Slob, and M. Vanclooster, "Measuring the soil water content profile of a sandy soil with an off-ground monostatic ground penetrating radar," Vadose Zone Journal, Vol. 3, No. 4, 1063-1071, 2004.

    21. Suksmono, A. B., E. Bharata, A. A. Lestari, A. G. Yarovoy, and L. P. Ligthart, "Compressive stepped-frequency continuous-wave ground-penetrating radar," IEEE Geoscience and Remote Sensing Letters, Vol. 7, No. 4, 665-669, 2010.

    22. Ylaya, V. J. V., O. J. L. Gerasta, J. M. S. Macasero, D. P. Pongcol, N. M. Pandian, and R. R. P. Vicerra, "Linear frequency modulated continuous wave LFM-CW short-range radar for detecting subsurface water content with deep learning," 2020 IEEE 12th International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environm, 1-6, IEEE, 2020.

    23. Jannah, S., A. A. Pramudita, and F. Y. Suratman, "Experiment of FMCW radar for small displacement detection using VNA," 2021 International Conference on Radar, Antenna, Microwave, Electronics, and Telecommunications (ICRAMET), 1-6, IEEE, 2021.

    24. Shahdan, I. S., R. Mardeni, and K. S. Subari, "Simulation of frequency modulated continuous wave ground penetrating radar using advanced design system (ADS)," 2010 IEEE Asia-Paci c Conference on Applied Electromagnetics (APACE), 1-5, IEEE, 2010.

    25. Mayoral, C. Q., C. G. Gonzalez, J. C. I. Galarregui, D. Marin, D. Gaston, C. Miranda, R. Gonzalo, I. Maestrojuan, L. G. Santesteban, and I. Ederra, "Water content continuous monitoring of grapevine xylem tissue using a portable low-power cost-effective FMCW radar," IEEE Transactions on Geoscience and Remote Sensing, Vol. 57, No. 8, 5595-5605, 2019.

    26. Aliefudin, F. N., D. Arseno, and A. Pramudita, "Wall effect compensation for detection improvement of through the wall radar," 2019 International Conference on Information and Communications Technology (ICOIACT), 281-284, IEEE, 2019.

    27. Purwandani, A. and A. Pramudita, "Accuracy improvement in through the wall radar based on deconvolution and delay estimation," 2020 10th Electrical Power, Electronics, Communications, Controls and Informatics Seminar (EECCIS), 288-292, IEEE, 2020.

    28. Ridhia, F. and A. A. Pramudita, "A method for estimating soil water content in the presence of vegetation using FMCW radar," 2022 11th Electrical Power, Electronics, Communications, Controls and Informatics Seminar (EECCIS), 154-159, IEEE, 2022.

    29. Huang, T., C. Zhang, D. Lu, Q. Zeng, W. Fu, and Y. Yan, "Improving FMCW GPR precision through the CZT algorithm for pavement thickness measurements," Electronics, Vol. 11, No. 21, 2022.

    30. Topp, G. C., J. Davis, and A. P. Annan, "Electromagnetic determination of soil water content: Measurements in coaxial transmission lines," Water Resources Research, Vol. 16, No. 3, 574-582, 1980.

    31. Pramudita, A. A., Y. Wahyu, S. Rizal, M. D. Prasetio, A. N. Jati, R. Wulansari, and H. H. Ryanu, "Soil water content estimation with the presence of vegetation using ultra wideband radar-drone," IEEE Access, Vol. 10, 85213-85227, 2022.

    32. Bechtel, T., et al., "Characterization of electromagnetic properties of in situ soils for the design of landmine detection sensors: Application in Donbass, Ukraine," Remote Sensing, Vol. 11, No. 10, 1232, 2019.

    33. Bodale, I., G. Mihalache, V. Achitei, G.-C. Teliban, A. Cazacu, and V. Stoleru, "Evaluation of the nutrients uptake by tomato plants in different phenological stages using an electrical conductivity technique," Agriculture, Vol. 11, No. 4, 292, 2021.

    34. Wu, M. and C. Kubota, "Effects of electrical conductivity of hydroponic nutrient solution on leaf gas exchange of five greenhouse tomato cultivars," Hort Technology, Vol. 18, No. 2, 271-277, 2008.

    35. Filho, J., C. Gaspar de Oliveira, P. Caramori, G. Nagashima, and F. Hernandez, "Cold tolerance of forage plant species," Semina: Ciencias Agrarias, Vol. 39, 1469, 2018.

    36. Calori, A. H., T. L. Factor, J. C. Feltran, E. Y.Watanabe, C. C. D. Moraes, and L. F. V. Purquerio, "Electrical conductivity of the nutrient solution and plant density in aeroponic production of seed potato under tropical conditions (winter/spring)," Bragantia, Vol. 76, 23-32, 2017.