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<p>Signals in the L band frequency range exhibit a strong sensitivity to variations in soil moisture. The Indian Regional Navigation Satellite System, known as NavIC, utilizes the L5 spectrum for both transmission and reception. These L5 signals can serve as signals of opportunity for remotely estimating soil moisture. This paper utilizes the NavIC-IR approach to assess soil moisture. To enhance the peak-to-peak amplitude of the interference pattern generated by direct and reflected signals, the antenna is horizontally oriented. This orientation ensures that both the direct and reflected signals are received through the front lobe of the antenna, which has high gain and is designed to receive right-hand circularly polarized (RHCP) signals. Due to its specific design for receiving RHCP transmissions, the antenna is unable to pick up the reflected left-hand circularly polarized (LHCP) signal. As a result, the phase shift in the received reflected signal induced by soil moisture variation is only due to the RHCP reflected signal. The experiment demonstrates a linear relationship between the phase of the reflected signal and volumetric soil moisture. A 2° change in the reflected signal phase corresponds to a 10% change in volumetric soil moisture. Furthermore, the peak-to-peak amplitude of the interference pattern nearly doubled.</p>

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A Novel Technique to Enhance the Magnitude of NavIC–IR signal at Higher Elevation Angles for the Evaluation of Volumetric Soil Moisture

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • C. D. Raisy,
  • Sharda Vashisth,
  • Amitava Sen Gupta

摘要

Signals in the L band frequency range exhibit a strong sensitivity to variations in soil moisture. The Indian Regional Navigation Satellite System, known as NavIC, utilizes the L5 spectrum for both transmission and reception. These L5 signals can serve as signals of opportunity for remotely estimating soil moisture. This paper utilizes the NavIC-IR approach to assess soil moisture. To enhance the peak-to-peak amplitude of the interference pattern generated by direct and reflected signals, the antenna is horizontally oriented. This orientation ensures that both the direct and reflected signals are received through the front lobe of the antenna, which has high gain and is designed to receive right-hand circularly polarized (RHCP) signals. Due to its specific design for receiving RHCP transmissions, the antenna is unable to pick up the reflected left-hand circularly polarized (LHCP) signal. As a result, the phase shift in the received reflected signal induced by soil moisture variation is only due to the RHCP reflected signal. The experiment demonstrates a linear relationship between the phase of the reflected signal and volumetric soil moisture. A 2° change in the reflected signal phase corresponds to a 10% change in volumetric soil moisture. Furthermore, the peak-to-peak amplitude of the interference pattern nearly doubled.