Sensors, Vol. 19, Pages 4524: Study on the Quality Control for Periodogram in the Determination of Water Level Using the GNSS-IR Technique

Sensors, Vol. 19, Pages 4524: Study on the Quality Control for Periodogram in the Determination of Water Level Using the GNSS-IR Technique Sensors doi: 10.3390/s19204524 Authors: Minfeng Song Xiufeng He Xiaolei Wang Ye Zhou Xueyong Xu A GNSS station, located on the shore of sea and inland waters, and equipped with standard geodetic receivers and antennas, can be used to measure water levels using a technique called GNSS Interferometric Reflectometry (GNSS-IR). The classical GNSS-IR method is based on SNR data and LSP spectrum analysis method. In order to promote the application of GNSS-IR, the accuracy of the results needs to be further improved, and quality control needs to be achieved better. Classical quality control methods include denoising filtering based on data source SNR; post-processing filtering based on results; morphological analysis based on parameters, such as the ratio of the maximum peak value to the background noise mean, the ratio of the maximum peak to the sub-peak, and the amplitude of the maximum peak. All three methods have the problem of correct frequency extraction under multiple approximate peak conditions. This paper focuses on the performance analysis of three methods of quality control for two situations with real examples, summarizes the advantages and disadvantages of each method, and discusses the measures in applications. Considering the limitations in the threshold setting for the third method, a new quality control method com...
Source: Sensors - Category: Biotechnology Authors: Tags: Article Source Type: research