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CHEN Liangyu, AN Jiachun, WANG Zemin, LIU Jingbin, QU Xiaochuan. Assessment of GNSS-IR-based snow-depth retrievals using observations from different receivers with the same antenna[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210710
Citation: CHEN Liangyu, AN Jiachun, WANG Zemin, LIU Jingbin, QU Xiaochuan. Assessment of GNSS-IR-based snow-depth retrievals using observations from different receivers with the same antenna[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210710

Assessment of GNSS-IR-based snow-depth retrievals using observations from different receivers with the same antenna

doi: 10.13203/j.whugis20210710
Funds:

The National Natural Science Foundation of China (42171141,41941010).

  • Received Date: 2022-06-21
  • Objectives: The emerging global navigation satellite system interferometric reflectometry (GNSS-IR) technique can obtain the property of reflector using geodetic GNSS receiver, and has been extensively applied to the research on snow depth, tide level, soil moisture, sea surface wind and so on. However, multipath suppression technique is often adopted in geodetic GNSS receiver and the reflected signal will be weakened or even eliminated, which will undoubtedly reduce the performance of GNSS-IR. Therefore, the influence of multi-receiver and multifrequency on GNSS-IR should be carefully investigated. Methods: By learning from the method of zero baseline, we design an experiment of snow depth retrievals using GNSS-IR at Chinese Yellow River Station in Svalbard, and quantitatively illustrate the influence of receiver performance on the accuracy of snow depth retrievals. In the experiment, two different GNSS receivers are connected to the same antenna with a power divider. It brings a special benefit that the observations of two receivers at three frequencies are derived from absolutely the same reflector. After collecting enough data, the daily average retrievals of the two receivers in the three frequencies are compared in order to verify the effectiveness of the retrieval strategy. Then the differences in the retrieval effects of different receivers are discussed through the comparison and analysis of the single retrievals. Results: The results show that the observations of each receiver and each frequency can be used to retrieve snow depth and the bias is in 3 cm. However, in spite of the same reflector, the differences between the snow depth retrievals from two receivers and three frequencies remain, especially when the snow depth changes rapidly. Conclusions: Different receivers have different methods and technologies to suppress multipath effect, which will affect the retrieval effect of GNSS-IR. Therefore, when using geodetic GNSS receivers for GNSS-IR retrievals, the difference brought by receivers cannot be ignored. If the method of multipath suppression can be properly considered in GNSS data processing, it should be helpful to improve the accuracy of GNSS-IR retrievals.
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    [3] Wan W, Bai W H, Zhao L M, et al.Initial Results of China's GNSS-R Airborne Campaign:Soil Moisture Retrievals[J].Science Bulletin, 2015, 60(10):964-971
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    [5] Larson K M, Gutmann E D, Zavorotny V U, et al.Can we Measure Snow Depth with GPS Receivers?[J].Geophysical Research Letters, 2009, 36(17)
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Assessment of GNSS-IR-based snow-depth retrievals using observations from different receivers with the same antenna

doi: 10.13203/j.whugis20210710
Funds:

The National Natural Science Foundation of China (42171141,41941010).

Abstract: Objectives: The emerging global navigation satellite system interferometric reflectometry (GNSS-IR) technique can obtain the property of reflector using geodetic GNSS receiver, and has been extensively applied to the research on snow depth, tide level, soil moisture, sea surface wind and so on. However, multipath suppression technique is often adopted in geodetic GNSS receiver and the reflected signal will be weakened or even eliminated, which will undoubtedly reduce the performance of GNSS-IR. Therefore, the influence of multi-receiver and multifrequency on GNSS-IR should be carefully investigated. Methods: By learning from the method of zero baseline, we design an experiment of snow depth retrievals using GNSS-IR at Chinese Yellow River Station in Svalbard, and quantitatively illustrate the influence of receiver performance on the accuracy of snow depth retrievals. In the experiment, two different GNSS receivers are connected to the same antenna with a power divider. It brings a special benefit that the observations of two receivers at three frequencies are derived from absolutely the same reflector. After collecting enough data, the daily average retrievals of the two receivers in the three frequencies are compared in order to verify the effectiveness of the retrieval strategy. Then the differences in the retrieval effects of different receivers are discussed through the comparison and analysis of the single retrievals. Results: The results show that the observations of each receiver and each frequency can be used to retrieve snow depth and the bias is in 3 cm. However, in spite of the same reflector, the differences between the snow depth retrievals from two receivers and three frequencies remain, especially when the snow depth changes rapidly. Conclusions: Different receivers have different methods and technologies to suppress multipath effect, which will affect the retrieval effect of GNSS-IR. Therefore, when using geodetic GNSS receivers for GNSS-IR retrievals, the difference brought by receivers cannot be ignored. If the method of multipath suppression can be properly considered in GNSS data processing, it should be helpful to improve the accuracy of GNSS-IR retrievals.

CHEN Liangyu, AN Jiachun, WANG Zemin, LIU Jingbin, QU Xiaochuan. Assessment of GNSS-IR-based snow-depth retrievals using observations from different receivers with the same antenna[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210710
Citation: CHEN Liangyu, AN Jiachun, WANG Zemin, LIU Jingbin, QU Xiaochuan. Assessment of GNSS-IR-based snow-depth retrievals using observations from different receivers with the same antenna[J]. Geomatics and Information Science of Wuhan University. doi: 10.13203/j.whugis20210710
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