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A Forward GPS Multipath Simulator Based on the Vegetation Radiative Transfer Equation Model
Wu, Xuerui1,2; Jin, Shuanggen1,2; Xia, Junming3
2017-06-01
Source PublicationSENSORS
ISSN1424-8220
Volume17Issue:6Pages:16
Corresponding AuthorWu, Xuerui(xrwu@shao.ac.cn)
AbstractGlobal Navigation Satellite Systems (GNSS) have been widely used in navigation, positioning and timing. Nowadays, the multipath errors may be re-utilized for the remote sensing of geophysical parameters (soil moisture, vegetation and snow depth), i.e., GPS-Multipath Reflectometry (GPS-MR). However, bistatic scattering properties and the relation between GPS observables and geophysical parameters are not clear, e.g., vegetation. In this paper, a new element on bistatic scattering properties of vegetation is incorporated into the traditional GPS-MR model. This new element is the first-order radiative transfer equation model. The new forward GPS multipath simulator is able to explicitly link the vegetation parameters with GPS multipath observables (signal-to-noise-ratio (SNR), code pseudorange and carrier phase observables). The trunk layer and its corresponding scattering mechanisms are ignored since GPS-MR is not suitable for high forest monitoring due to the coherence of direct and reflected signals. Based on this new model, the developed simulator can present how the GPS signals (L1 and L2 carrier frequencies, C/A, P(Y) and L2C modulations) are transmitted (scattered and absorbed) through vegetation medium and received by GPS receivers. Simulation results show that the wheat will decrease the amplitudes of GPS multipath observables (SNR, phase and code), if we increase the vegetation moisture contents or the scatters sizes (stem or leaf). Although the Specular-Ground component dominates the total specular scattering, vegetation covered ground soil moisture has almost no effects on the final multipath signatures. Our simulated results are consistent with previous results for environmental parameter detections by GPS-MR.
KeywordGNSS-R multipath radiative transfer equation model vegetation simulation
DOI10.3390/s17061291
WOS KeywordMICROWAVE DIELECTRIC BEHAVIOR ; SOIL-MOISTURE ; POLARIMETRIC MEASUREMENTS ; BISTATIC RADAR ; WET SOIL ; REFLECTOMETRY ; PARAMETERS
Indexed BySCI
Language英语
WOS Research AreaChemistry ; Electrochemistry ; Instruments & Instrumentation
WOS SubjectChemistry, Analytical ; Electrochemistry ; Instruments & Instrumentation
WOS IDWOS:000404553900107
PublisherMDPI AG
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22908
Collection中国科学院紫金山天文台
Corresponding AuthorWu, Xuerui
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Key Lab Planetary Sci, Shanghai 200030, Peoples R China
3.Chinese Acad Sci, Natl Space Sci Ctr, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Wu, Xuerui,Jin, Shuanggen,Xia, Junming. A Forward GPS Multipath Simulator Based on the Vegetation Radiative Transfer Equation Model[J]. SENSORS,2017,17(6):16.
APA Wu, Xuerui,Jin, Shuanggen,&Xia, Junming.(2017).A Forward GPS Multipath Simulator Based on the Vegetation Radiative Transfer Equation Model.SENSORS,17(6),16.
MLA Wu, Xuerui,et al."A Forward GPS Multipath Simulator Based on the Vegetation Radiative Transfer Equation Model".SENSORS 17.6(2017):16.
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