Analysis of Influencing Factors of Distributed Satellite InSAR Height-Measurement Accuracy based on Positioning Equation

Lu, Ruifeng; Wen, JunJian; Zhao, Debin; Liu, Yanyang; Hou, Yusheng; Chen, Chonghua

doi:10.1109/ciss57580.2022.9971441

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…For instance, the value of the slant range directly influences height accuracy, with a 30 m slant range error typically resulting in a height error of 15 to 30 m. Additionally, azimuth time errors can lead to discrepancies between the estimated and actual satellite positions. If the satellite's velocity is 7.6 km/s, a 2 ms azimuth time error can result in a 15.2 m position estimation error, thus affecting the baseline vector derived from the subtraction of master and slave satellite vectors [46]. In cases with a 70 m ambiguous height, a 1 cm baseline error in the L-band biSAR system can introduce approximately 3 m of height error [33].…”

Section: Discussionmentioning

confidence: 99%

First Assessment of Bistatic Geometric Calibration and Geolocation Accuracy of Innovative Spaceborne Synthetic Aperture Radar LuTan-1

Mou,

Wang,

Hong

et al. 2023

Remote Sensing

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LuTan-1 (LT-1) is a bistatic synthetic aperture radar (BiSAR) system consisting of two identical L-band SAR satellites. The bistatic mode of LT-1 plays a critical role in generating high-precision digital elevation models (DEMs), which requires precise geometric calibration of initial range and azimuth times for both SARs to ensure the reliability and quality of geolocation. However, existing geometric calibration methods predominantly focus on monostatic SAR systems, with limited literature on slave SAR calibration in bistatic systems. This research addresses this gap by establishing geometric calibration models for both SARs based on signal echo history and the range–Doppler model. The geometric errors are effectively resolved using corner reflector data from Xinjiang, China. Through statistical analysis of LT-1 SAR images acquired between July and November in bistatic mode, this paper has demonstrated range delay accuracy of better than 5 ns and azimuth time accuracy of better than 0.1 ms. This level of precision translates into a positional accuracy better than 0.8 m. The proposed models have been successfully applied to geometric calibration, providing precise geolocation for LT-1, thus enhancing its utility for a wide range of Earth observation applications. This paper is the first endeavor to present the assessment of the geometric calibration and geolocation accuracy of LT-1 and discuss the results of the bistatic geometric calibration of the master and slave SARs in a BiSAR formation.

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Section: Discussionmentioning

confidence: 99%

First Assessment of Bistatic Geometric Calibration and Geolocation Accuracy of Innovative Spaceborne Synthetic Aperture Radar LuTan-1

Mou,

Wang,

Hong

et al. 2023

Remote Sensing

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“…The accuracy of DEMs produced through InSAR is significantly influenced by various interferometric parameters, each affecting the height accuracy to different extents [15][16][17]. These parameters include flight altitude error, slant range error, interferometric phase error, and baseline error, with their impact on InSAR-derived heights ranging from least to most substantial [18]. Precision orbit determination is effectively employed to minimize flight altitude errors [19], and geometric calibration methods proficiently address slant range inaccuracies [20].…”

Section: Introductionmentioning

confidence: 99%

Interferometric Calibration Model for the LuTan-1 Mission: Enhancing Digital Elevation Model Accuracy

Mou,

Wang,

Hong

et al. 2024

Remote Sensing

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The LuTan-1 (LT-1) mission, China’s first civilian bistatic spaceborne Synthetic Aperture Radar (SAR) mission, comprises two L-band SAR satellites. These satellites operate in bistatic InSAR strip map mode, maintaining a formation flight with an adjustable baseline to generate global digital elevation models (DEMs) with high accuracy and spatial resolution. This research introduces a dedicated interferometric calibration model for LT-1, tackling the unique challenges of the bistatic system, such as interferometric parameter coupling and the π-ambiguity problem caused by synchronization phase errors. This study validates the model using SAR images from LT-1 and Xinjiang corner reflector data, achieving interferometric phase accuracy better than 0.1 rad and baseline accuracy better than 2 mm, thereby producing high-precision DEMs with a height accuracy meeting the 5 m requirement.

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Analysis of Influencing Factors of Distributed Satellite InSAR Height-Measurement Accuracy based on Positioning Equation

Cited by 2 publications

References 2 publications

First Assessment of Bistatic Geometric Calibration and Geolocation Accuracy of Innovative Spaceborne Synthetic Aperture Radar LuTan-1

First Assessment of Bistatic Geometric Calibration and Geolocation Accuracy of Innovative Spaceborne Synthetic Aperture Radar LuTan-1

Interferometric Calibration Model for the LuTan-1 Mission: Enhancing Digital Elevation Model Accuracy

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