First accuracy assessment of the HY-2A altimeter sea surface height observations: Cross-calibration results

Bao, Lifeng; Gao, Peng; Peng, Hailong; Jia, Yongjun; Shum, C. K.; Lin, Minseng; Guo, Qi

doi:10.1016/j.asr.2014.09.034

Cited by 44 publications

(30 citation statements)

References 30 publications

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“…While lasers were employed for geodesy first [9][10][11][12][13][14][15][16][17][18][19][20][21][22] and also orbital determination [23][24][25][26][27][28][29][30][31][32][33], the 1990s jump-started scientific examination of space and satellite laser communications . Over roughly the next decade, the U.S. National Aeronautics and Space Administration as well as the European and Japanese space agencies completed successful trials of space-based laser communications [34].…”

Section: Early Twenty-first Centurymentioning

confidence: 99%

Preparing for Satellite Laser Uplinks and Downlinks

Dmytryszyn¹,

Crook²,

Sands³

2020

Sci

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The use of Light Amplification by Stimulated Emission of Radiation (i.e., LASERs or lasers) by the U.S. Department of Defense is not new and includes laser weapons guidance, laser-aided measurements, even lasers as weapons (e.g., Airborne Laser). Lasers in support of telecommunications is also not new. The use of laser light in fiber optics shattered thoughts on communications bandwidth and throughput. Even the use of lasers in space is no longer new. Lasers are being used for satellite-to-satellite crosslinking. Laser communication can transmit orders-of-magnitude more data using orders-of-magnitude less power and can do so with minimal risk of exposure to the sending and receiving terminals. What is new is using lasers as the uplink and downlink between the terrestrial segment and the space segment of satellite systems. More so, the use of lasers to transmit and receive data between moving terrestrial segments (e.g., ships at sea, airplanes in flight) and geosynchronous satellites is burgeoning. This manuscript examines the technological maturation of employing lasers as the signal carrier for satellite communications linking terrestrial and space systems. The purpose of the manuscript is to develop key performance parameters (KPPs) to inform U.S. Department of Defense initial capabilities documents (ICDs) for near-future satellite acquisition and development. By appreciating the history and technological challenges of employing lasers rather than traditional radio frequency sources for satellite uplink and downlink signal carriers, this manuscript recommends ways for the U.S. Department of Defense to employ lasers to transmit and receive high bandwidth, large-throughput data from moving platforms that need to retain low probabilities of detection, intercept, and exploitation (e.g., carrier battle group transiting to a hostile area of operations, unmanned aerial vehicle collecting over adversary areas). The manuscript also intends to identify commercial sector early-adopter fields and those fields likely to adapt to laser employment for transmission and receipt.

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Section: Early Twenty-first Centurymentioning

confidence: 99%

Preparing for Satellite Laser Uplinks and Downlinks

Dmytryszyn¹,

Crook²,

Sands³

2020

Sci

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“…The result shows that the quality performances of the HY-2A near-real-time wind vector data (especially the wind speeds) were satisfactory throughout the service period. A cross comparison with JASON-2 data over the same period has been performed in order to compare the sea surface height and sea level anomaly of the HY-2 altimeter [14]. In that paper, Bao et al found that the precision of HY-2 sea surface height is the same as that of JASON-2.…”

Section: Range Of the Significantmentioning

confidence: 99%

“…[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] As the other microwave sensor, the scatterometer mounted on HY-2A is used to provide observations of vector wind at the sea surface. With a rotating dish antenna that can generate a pair of conically scanned pencil beams at two incidence angles, it takes multiple looks at the same sea surface area by transmitting pulses and receiving the returns either from different directions or at different polarizations.…”

Section: Range Of the Significantmentioning

confidence: 99%

The Customized Automatic Processing Framework for HY-2A Satellite Marine Advanced Products

Liu

Huang

et al. 2016

Remote Sensing

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HY-2A, as the first Chinese ocean dynamic environment satellite, provides an effective and efficient way of observing ocean properties. However, in the operational stage, some inconveniences of the existing ground application system have appeared. Based on the review of users' requirements for data services, the Customized Automatic Processing Framework (CAPF) for HY-2A advanced products is proposed and has been developed. As an extension of the existing ground application system, the framework provides interfaces for adding customized algorithms, designing on-demand processing workflows, and scheduling the processing procedures. With the customized processing templates, the framework allows users to easily process the products according to their own expectations, which facilitates the usage of HY-2A satellite advanced products.

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“…An 8.2-ms time tag bias was obtained by sea level anomaly fitting, and an 8.3-ms time tag bias was obtained by the crossover differencing approach [8]. [9]. The transponder, as an in-orbit radar altimeter calibration approach, can also be used to estimate the time tag bias of the altimeter.…”

Section: Introductionmentioning

confidence: 99%

HY-2A Altimeter Time Tag Bias Estimation Using Reconstructive Transponder

Wan

Guo

Zhao

et al. 2015

IEEE Geosci. Remote Sensing Lett.

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Independent clocks provide time tags for the precision orbit determination (POD) equipment and the radar altimeter onboard the HY-2A satellite, and a bias between POD data' time tag and corresponding range observation's time tag from the HY-2A altimeter exists. The time tag bias contributes a bias in the sea surface height observation due to the nonzero time rate of change of the HY-2A altimeter's height. A transponder for in-orbit radar altimeter calibration provides an approach to estimate the time tag bias. The altimeter receives the responding signals from the transponder and generates ranges. Pertinent reference ranges are obtained from the POD data and the transponder's coordinate. Using the ranges from the radar altimeter and the reference ranges, the time tag bias between the POD data and the altimeter observations can be estimated. During an in situ HY-2A altimeter calibration campaign using a reconstructive transponder from August 9, 2012, to July 20, 2014, 17 estimations of the altimeter's time tag bias were obtained. The preliminary results are presented in this letter.

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First accuracy assessment of the HY-2A altimeter sea surface height observations: Cross-calibration results

Cited by 44 publications

References 30 publications

Preparing for Satellite Laser Uplinks and Downlinks

Preparing for Satellite Laser Uplinks and Downlinks

The Customized Automatic Processing Framework for HY-2A Satellite Marine Advanced Products

HY-2A Altimeter Time Tag Bias Estimation Using Reconstructive Transponder

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