Sea Level Estimation Based on GNSS Dual-Frequency Carrier Phase Linear Combinations and SNR

Wang, Nazi; Xu, Tianhe; Gao, Fan; Xu, Guochang

doi:10.3390/rs10030470

Cited by 34 publications

(23 citation statements)

References 39 publications

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“…In addition, the accuracy of code ranging is related to different systems (Wang et al 2019;Odolinski et al 2015, Nadarajah et al 2016. Furthermore, the errors of the code-level range can be affected by many factors, such as the sampling rate, thermal noise, CN0, and loop dynamic stress error (Tsui 2005).…”

Section: Estimation Of the Reflector Heightmentioning

confidence: 99%

A shipborne experiment using a dual-antenna reflectometry system for GPS/BDS code delay measurements

Gao

Wang

et al. 2020

J Geod

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Global navigation satellite system-reflectometry (GNSS-R) has great potential to be a novel technique for altimetry, which can be used to derive sea surface heights (SSH). Shipborne altimetry is an important method to measure local SSH with high spatial resolution. In order to test the feasibility of shipborne dual-antenna GNSS-R reflector height retrieval, we developed a GNSS-R receiver system and performed experiments on a research vessel. In this study, direct and reflected GPS/BDS signals were collected using the same setup, and processed to estimate the reflector heights on the basis of path-delay measurements. A strategy of obtaining the GPS/BDS code-level path delay based on 10-ms coherent integration waveforms was adopted. We analyzed the relationship between the path-delay error and the error of the estimated reflector height, and we pointed out that the error in the path delay was amplified when the satellite elevation was low. We also performed reflector height retrieval based on BDS-3 signals for the first time. We evaluated the precisions of the BDS-R and GPS-R derived reflector heights with 30°and 50°cut-off elevations. The results show that the standard deviation of solutions at different cases is around 1.0 m and precisions are slightly better for a 50°cut-off angle compared with a 30°cut-off angle. In general, the mean values of different cases are close, with differences of several centimeters for the experiments.

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Section: Estimation Of the Reflector Heightmentioning

confidence: 99%

A shipborne experiment using a dual-antenna reflectometry system for GPS/BDS code delay measurements

Gao

Wang

et al. 2020

J Geod

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“…There are three ground-based GNSS-R methods to retrieve sea surface height (SSH): SNR method [10], [11], code delay method and phase delay method [12], [13]. The SNR method altimetry setup contains only one GNSS receiver, which measures the surface height through the SNR evolution with the elevation angle of the GNSS satellite.…”

Section: Introductionmentioning

confidence: 99%

Sea Surface Height Estimation by Ground-Based BDS GEO Satellite Reflectometry

Chen

Gao

et al. 2020

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Chinese BeiDou Navigation Satellite System (BDS) as a mixed constellation, consists of not only Medium Earth Orbit (MEO) satellites but also Inclined Geosynchronous Orbit (IGSO) and Geostationary Earth Orbit (GEO) satellites, of which the GEO satellites remain visible and stationary in the Asia-Pacific region almost all the time so as to better ensure the reflected signals' stability and continuity, compared to using only MEO satellites in previous GNSS-R remote sensing research. This paper demonstrates ocean altimetry capability using reflected signals from BDS GEO satellite with coastal experiments conducted in Weihai, Shandong, China on July 6 and July 9, 2019. By using only one GEO satellite, the precision of DDM (Delay Doppler Map) and phase altimetry is up to decimeter (close to millimeter) level. And the results show that BDS GEO-R technique can be used to monitor small changes in ocean altimetry with high temporal resolution.

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“…Although all GNSS observables are influenced by multipath and can be used for the estimation of the reflector height [7], IPT relates mostly on the analysis of the oscillating structure of the signal-to-noise ratio (SNR) data because it is less influenced by cycle slips or atmospheric refraction as code or carrier phase data. According to [8,9], the frequency of the oscillation is related to the height of the GNSS antenna above a horizontal reflector.…”

Section: Introductionmentioning

confidence: 99%

Estimating Wave Direction Using Terrestrial GNSS Reflectometry

2019

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The signal-to-noise ratio (SNR) data are part of the global navigation satellite systems (GNSS) observables. In a marine environment, the oscillation of the SNR data can be used to derive reflector heights. Since the attenuation of the SNR oscillation is related to the roughness of the sea surface, the significant wave height (SWH) of the water surface can be calculated from the analysis of the attenuation. The attenuation depends additionally on the relation between the coherent and the incoherent part of the scattered power. The latter is a function of the correlation length of the surface waves. Since the correlation length changes with respect to the direction of the line of sight relative to the wave direction, the attenuation must show an anisotropic characteristic. In this work, we present a method to derive the wave direction from the anisotropy of the attenuation of the SNR data. The method is investigated based on simulated data, as well by the analysis of experimental data from a GNSS station in the North Sea.

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Sea Level Estimation Based on GNSS Dual-Frequency Carrier Phase Linear Combinations and SNR

Cited by 34 publications

References 39 publications

A shipborne experiment using a dual-antenna reflectometry system for GPS/BDS code delay measurements

A shipborne experiment using a dual-antenna reflectometry system for GPS/BDS code delay measurements

Sea Surface Height Estimation by Ground-Based BDS GEO Satellite Reflectometry

Estimating Wave Direction Using Terrestrial GNSS Reflectometry

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