Copernicus Sentinel–1 POD reprocessing campaign

Fernández, María Pilar Valero; Peter, Heike; Arnold, Daniel; Duan, Bingbing; Simons, Wim; Wermuth, Martin; Hackel, Stefan; Fernández, Jaime; Jäggi, Adrian; Hugentobler, Urs; Visser, Pieter; Féménias, Pierre

doi:10.1016/j.asr.2022.04.036

Cited by 10 publications

(8 citation statements)

References 28 publications

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“…The quality of the satellite orbit data, which directly impact the projection system, has also significantly improved. With on-board Global Positioning System (GPS) receivers, these errors are on the order of a few centimeters for Sentinel-1 [24] and largely in the along-track direction. This is a massive improvement over the previous generation sensors where the errors were in the order of few meters.…”

mentioning

confidence: 99%

An Efficient Global Scale Sentinel-1 Radar Backscatter and Interferometric Processing System

et al. 2022

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We describe an efficient and cost-effective data access mechanism for Sentinel-1 Terrain Observation with Progressive Scans (TOPS) mode bursts. Our data access mechanism enables burst-based data access and processing, thereby eliminating the European Space Agency’s (ESA’s) Sentinel-1 Single Look Complex (SLC) data packaging conventions as a bottleneck to large scale processing. The pipeline throughput is now determined by the available computation resources and the efficiency of the analysis algorithms. For targeted infrastructure monitoring studies, we are able to generate coregistered, geocoded stacks of SLCs for any area of interest (AOI) in the world, in a few minutes. In addition, we describe our global scale radar backscatter and interferometric products, and associated pipeline design decisions that ensure geolocation consistency across the suite of derived products from Sentinel-1 data. Finally, we discuss the benefits and limitations of working with geocoded SLC data.

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confidence: 99%

An Efficient Global Scale Sentinel-1 Radar Backscatter and Interferometric Processing System

et al. 2022

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“…Piecewise empirical acceleration has been widely used in LEO POD to compensate for the deficiencies in prior force models (Bock et al, 2014;Fernández et al, 2022; Y. C. Wang et al, 2021). The empirical accelerations are estimated in the along-track, cross-track, and radial directions, and they can be introduced as measure indicators for mismodeled effects, which are described in Montenbruck, Hackel, et al (2021).…”

Section: Pod Modelsmentioning

confidence: 99%

“…Reduced‐dynamic precise orbit determination (POD) developed by Wu et al. (1991) currently represents a well‐established technique and is widely applied for LEO missions requiring the utmost orbit precision and accuracy (Fernández et al., 2022; Hackel et al., 2016; Li et al., 2017; Montenbruck, Kunzi, & Hauschild, 2021). Based on an accurate conservative force model, this method makes use of scale parameters for non‐gravitational forces and empirical accelerations to address the uncertainty in orbit determination.…”

Section: Introductionmentioning

confidence: 99%

Improving Precise Orbit Determination of LEO Satellites Using Enhanced Solar Radiation Pressure Modeling

Wang

Jiang

et al. 2023

Space Weather

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Precise orbit knowledge is a fundamental requirement for low Earth orbit (LEO) satellites. High‐precision non‐gravitational force modeling directly improves the overall quality of LEO precise orbit determination (POD). To address the potential systematic errors in solar radiation pressure (SRP), we introduce observed radiation data and modeled physical effects to describe the real in‐flight environment of satellites. Time‐dependent solar irradiance data and a highly physical shadow model are considered for SRP modeling. We develop an advanced thermal reradiation model for satellite solar panels. A set of improved non‐gravitational force models is performed for LEO POD, and we discuss the benefits of the enhanced dynamic models on orbit quality and dependence on empirical parameters. The Gravity Recovery and Climate Experiment Follow‐On (GRACE‐FO), Jason‐3, and Haiyang‐2B missions are selected for the POD process. Estimated empirical acceleration and scale parameters and independent satellite laser ranging (SLR) are used to validate the final orbit solutions. The magnitude of empirical acceleration estimated in POD is reduced by 19% with the enhanced dynamic modeling, and the estimated scale factor for the SRP converges to stable and reasonable level. Furthermore, the steady‐state temperature model used in thermal reradiation can effectively reduce mismodeled effects in the SRP, and the systematic linear dependency revealed by the SLR residuals is significantly reduced for the GRACE‐C and Jason‐3 satellites, with improvements of approximately 61% and 49%, respectively. Overall, advances are made in the explicit modeling of non‐gravitational forces to pursue superior satellite orbits, suggesting a more dynamic orbit solution.

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“…Alternatively, ACs may provide users with observablespecific signal biases (OSB) on each code and phase signal (e.g., Center for Orbit Determination in Europe, CODE prod-ucts, Villiger et al 2019;Schaer et al 2021). Theoretically, there should be no difference between these two types of products and both are proven to perform very well in the single-receiver ambiguity resolution (Teunissen and Khodabandeh 2015;Banville et al 2020;Montenbruck et al 2021;Mao et al 2021;Fernández et al 2022).…”

Section: Dual-frequency Proceduresmentioning

confidence: 99%

Performance of Galileo satellite products determined from multi-frequency measurements

Duan

Hugentobler

Montenbruck

et al. 2023

J Geod

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Each Galileo satellite provides coherent navigation signals in four distinct frequency bands. International GNSS Service (IGS) analysis centers (ACs) typically determine Galileo satellite products based on the E1/E5a dual-frequency measurements due to the software limitation and the limited tracking capability of other signals in the early time. The goal of this contribution is to evaluate the quality of Galileo satellite products determined by using different dual-frequency (E1/E5a, E1/E5b, E1/E5, E1/E6) and multi-frequency (E1/E5a/E5b/E5/E6) measurements based on different sizes of ground networks. The performance of signal noise, the consistency of frequency-specific satellite phase center offsets and the stability of satellite phase biases are assessed in advance to confirm preconditions for multi-frequency processing. Orbit results from different dual-frequency measurements show that orbit precision determined from E1/E6 is clearly worse (about 35%) than that from other dual-frequency solutions. In view of a similar E1, E5a, E5b and E6 measurement quality, the degraded E1/E6 orbit performance is mainly attributed to the unfavorable noise amplification in the respective ionosphere-free linear combination. The advantage of using multi-frequency measurements over dual-frequency for precise orbit determination is clearly visible when using small networks. For instance, the ambiguity fixing rate is 80% for the multi-frequency solution while it is less than 40% for the dual-frequency solution if 150 s data sampling is employed in a 15-station network. Higher fixing rates result in better (more than 30%) satellite orbits and more robust satellite clock and phase bias products. In general, satellite phase bias products determined from a 20-station (or more) network are precise enough to conduct precise point positioning with ambiguity resolution (PPP-AR) applications. Multi-frequency kinematic PPP-AR solutions always show 5–10% precision improvement compared to those computed from dual-frequency observations.

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Copernicus Sentinel–1 POD reprocessing campaign

Cited by 10 publications

References 28 publications

An Efficient Global Scale Sentinel-1 Radar Backscatter and Interferometric Processing System

An Efficient Global Scale Sentinel-1 Radar Backscatter and Interferometric Processing System

Improving Precise Orbit Determination of LEO Satellites Using Enhanced Solar Radiation Pressure Modeling

Performance of Galileo satellite products determined from multi-frequency measurements

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