Using the BDS-R Signal for Soil Moisture Estimation

  • Xueqian Luo
  • Songhua Yan
  • Juan Shan
  • Hui Yan
  • Hao Wang
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 388)

Abstract

BeiDou Navigation Satellite System Reflectometry (BDS-R) is an emerging area of BeiDou (BD) applications that use reflected signals in microwave remote sensing. Soil moisture (SM) estimation by using the BD GEO signals are more favorable than the GPS signals, since the fixed elevation angle, the fixed height of orbit, the fixed satellite coverage. In this study, the principle of SM measuring by BDS-R is described. First the signal-to-noise ratio (SNR) data of BD directed and reflected signals are collected though the right-hand circular polarization (RHCP) and left-hand circular polarization (LHCP) antenna, then the SNR data is extracted and the reflection coefficient is computed, at last, the variance of the reflection coefficient is calculated and the empirical model between in situ SM and the variance is established. One month of experimental data are collected at BaoXie, WuHan, and analyzed for further inversion. Experimental results show that the variance of reflection coefficient increases when SM increases and decreases when SM decreases. We can conclude that using BDS-R to retrieve SM is feasible, which will expand the application field of the BD system.

Keywords

BDS-R SM Reflection coefficient Variance SNR 

Notes

Acknowledgements

The authors would like to acknowledge the support of the National Natural Science Foundation of China (NSFC 41571420).

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Copyright information

© Springer Science+Business Media Singapore 2016

Authors and Affiliations

  • Xueqian Luo
    • 1
  • Songhua Yan
    • 1
  • Juan Shan
    • 1
  • Hui Yan
    • 1
  • Hao Wang
    • 1
  1. 1.School of Electronic InformationWuhan UniversityWuhanChina

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