Reliable and Stable Radiometers for Jason-3

Maiwald, Frank; Montes, Oliver; Padmanabhan, Sharmila; Michaels, Darren; iyakara, Amarit Kit; Jarnot, R. F.; Brown, Shannon; Dawson, Douglas E.; Wu, Amy C.; Hatch, W. A.; Stek, P. C.; Gaier, T.

doi:10.1109/jstars.2016.2535281

Cited by 16 publications

(19 citation statements)

References 6 publications

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“…The readout of the radiometer channel data from Jason-3 utilized voltage-to-frequency converters (VFC) that were replaced by analog to digital converters (ADC) with 18-bit resolution. Choosing the ADC removes the reported [4] "flat spots" in the radiometric data caused by harmonic locking of the VFC. The ADCs also resulted in reduced backend noise.…”

Section: Instrument Description and Developmentsmentioning

confidence: 99%

“…The ADCs also resulted in reduced backend noise. We applied the same assembly processes for all RF circuits, which were developed for Jason-3 [4].…”

Section: Instrument Description and Developmentsmentioning

confidence: 99%

“…1). The only active mission today is Jason-3, which was launched in 2016 [4]. With Sentinel-6A/B, the measurements will continue for an additional decade allowing more precise studies of the rate of sea-level rise (see Fig.…”

Section: Introductionmentioning

confidence: 99%

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Completion of the AMR-C Instrument for Sentinel-6

Maiwald

Brown

Koch

et al. 2020

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

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The advanced microwave radiometer-climate quality (AMR-C) is a part of the European Sentinel-6A/B series, a collaboration between ESA and NASA, of two Earth-observing satellites, which will be launched in 2020 and 2025. Compared to its predecessor, Jason-3, the two AMR-C radiometer instruments have an external calibration system which enables higher radiometric stability accomplished by moving the secondary mirror between well-defined targets. Sentinel-6 allows continuing the study of the ocean circulation, climate change, and sea-level rise for at least another decade. Besides the external calibration for the AMR heritage radiometer (18.7, 23.8, and 34 GHz channels), the AMR-C contains a high-resolution microwave radiometer (HRMR) with radiometer channels at 90, 130, and 168 GHz. This subsystem allows for a factor of 5× higher spatial resolution at coastal transitions. This article presents a brief description of the instrument and the measured performance of the completed AMR-C-A and AMR-C-B instruments.

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Section: Instrument Description and Developmentsmentioning

confidence: 99%

“…The ADCs also resulted in reduced backend noise. We applied the same assembly processes for all RF circuits, which were developed for Jason-3 [4].…”

Section: Instrument Description and Developmentsmentioning

confidence: 99%

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Completion of the AMR-C Instrument for Sentinel-6

Maiwald

Brown

Koch

et al. 2020

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

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“…With the primary reflector, the signal is funneled into the FHA and then send to the OrthoMode-Transducer (OMT), which splits the incoming signal into H and V that have orthogonal polarization. Both polarized signals are amplified by a modified Jason-3 receiver [3] with radiometers at 18.7, 23.8, and 33.9 GHz and then recombined in Polarimetric Backend Units (PBUs) for each frequency channel, see Figure 2. The three PBUs split the H and V signals into six Stokes parameters.…”

Section: System Descriptionmentioning

confidence: 99%

“…These analog signals are transformed by Voltage-to-Frequency Converters (VFC) into pulse trains. All pulses are counted with Frank Maiwald, Oliver Montes, Sharmila Padmanabhan, Amy Wu, Zack Pannell 1) , Violet Torossian, Alireza Bakshi 2) , Damon Russell, Jordan Tanabe, Hamid Javadi, Chris Holeman 3) , Maurice Aghion 3) , Rick Redick, Amarit Kitiyakara, Shannon Brown…”

Section: System Descriptionmentioning

confidence: 99%

RF and Electronics Design of the Compact Ocean Wind Vector Radiometer

Maiwald

Montes

Padmanabhan

et al. 2020

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

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Evaluating the Accuracy of Jason-3 Water Vapor Product Using PWV Data from Global Radiosonde and GNSS Stations

Gong

Liu

2020

Preprint

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Jason-3 is equipped with the Advanced Microwave Radiometer-2 (AMR-2) to account for the zenith wet delay (ZWD) caused by the troposphere in the altimeter signal, from which the precipitable water vapor (PWV) can be deduced. In order to investigate the accuracy of PWV from Jason-3 AMR-2 on a global scale, we adopt PWV observations from 263 radiosonde stations and 103 GNSS stations as reference PWV. These reference PWV are recorded during Jason-3 cycles 0 -119 and are globally distributed in coastal and island regions. Over 60,000 Jason-3 PWV vs radiosonde PWV comparison points and over 380,000 Jason-3 PWV vs GNSS PWV comparison points are used in this study. For GNSS PWV, two PWV height reduction methods (Kouba empirical method and ECMWF method) are used to reduce PWV from height of station to sea level. The comparison results indicate that the root mean square error (RMSE) of Jason-3 PWV evaluated using radiosonde PWV is 3.4 kg/m 2 . Jason-3 PWV has an RMSE of 3.0 kg/m 2 with GNSS PWV derived using ECMWF PWV height correction, while the RMSE between Jason-3 PWV and GNSS PWV derived using Kouba PWV height correction is 3.1 kg/m 2 . In addition, the accuracy of Jason-3 PWV increases when the latitude of its footprints or the distance from its footprints to land increases.

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Reliable and Stable Radiometers for Jason-3

Cited by 16 publications

References 6 publications

Completion of the AMR-C Instrument for Sentinel-6

Completion of the AMR-C Instrument for Sentinel-6

RF and Electronics Design of the Compact Ocean Wind Vector Radiometer

Evaluating the Accuracy of Jason-3 Water Vapor Product Using PWV Data from Global Radiosonde and GNSS Stations

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