The wide swath ocean altimeter: radar interferometry for global ocean mapping with centimetric accuracy

Pollard, B.; Rodríguez, Ernesto; Veilleux, Louise; Akins, T.; Brown, Paula R.; Kitiyakara, A.; Zawadski, M.; Datthanasombat, S.; Prata, A.

doi:10.1109/aero.2002.1035700

Cited by 19 publications

(13 citation statements)

References 4 publications

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“…The number of looks processed for each pixel will help to improve the instrumental height error budget. However, in contrast to the WSOA mission, where large multi-looking process were assumed ( [4][5][6]), a large pixel will cause phase unwrapping error, as well as land contamination, impacting the height error budget. Fig.…”

Section: System Descriptionmentioning

confidence: 99%

“…The WatER mission consists of a Ka band Radar Interferometer (KaRIN) coupled with a nadir Ka band altimeter (AltiKa) [3] for filling the nadir gap and for risk reduction in the KaRIN calibration. KaRIN builds on the heritage of the SRTM mission and the Wide Swath Ocean Altimeter (WSOA), originally expected to be implemented onboard Jason-2 [4][5][6], to provide a new measurement capability for monitoring fresh water.…”

Section: System Descriptionmentioning

confidence: 99%

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An assessment of the Ka band interferometric radar altimeter for monitoring rivers and lakes with the WatER mission

Enjolras

Rodríguez

2007

2007 IEEE International Geoscience and Remote Sensing Symposium

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The Water Elevation Recovery (WatER) satellite mission was recently proposed and supported by a large international scientific community. It is dedicated to the determination of land surface water extent, elevation and slope, and also ocean mesoscale and submesoscale phenomena, using a Ka band Radar Interferometer (KaRIN) as its primary instrument. This instrument is able to provide the appropriate space-time sampling required to observe full signatures of the parameters characterizing these phenomena. However, determining these parameters to the accuracy desired for hydrologic applications is challenging. error sources and implemented ground processing techniques to go from the original raw data to science data. We examined the impact of external errors in detail and implement calibration techniques that rely on the use of ancillary topographic data such as the SRTM digital elevation model. Ways of reducing initial instrument errors by averaging or fitting polynomial to height values over rivers and lake of various widths and for a range of water surface RMS slopes are presented. Finally, we show how the scientific requirements of the mission are met for all cases.This paper just gives an overview of the studies that are deeply detailed in [6][7].

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Section: System Descriptionmentioning

confidence: 99%

Section: System Descriptionmentioning

confidence: 99%

An assessment of the Ka band interferometric radar altimeter for monitoring rivers and lakes with the WatER mission

Enjolras

Rodríguez

2007

2007 IEEE International Geoscience and Remote Sensing Symposium

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“…Therefore, we utilize the flat-earth phase to calibrate the system parameters. Phases in the black box in Figure 7b are selected to acquire the flat-earth phase curve along the slant-range direction, then the flat-earth phase curve is fitted to the nominal Equation (13). By changing different combination of parameters ( , , ) and seeking the minimum RMSE between flat-earth phase curve and the nominal equation.…”

Section: Interferometric Data Processingmentioning

confidence: 99%

Performance Analysis of Ocean Surface Topography Altimetry by Ku-Band Near-Nadir Interferometric SAR

2017

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Abstract:Interferometric imaging radar altimeter (InIRA) is the first spaceborne Ku-band interferometric synthetic aperture radar (InSAR) which is specially designed for ocean surface topography altimetry. It is on the Tiangong II space laboratory, which was launched on 15 September 2016. Different from any other spaceborne synthetic aperture radar (SAR), InIRA chooses a near-nadir incidence of 1 •~8• in order to increase the altimetric precision and swath width. Limited by the size of the Tiangong II capsule, the baseline length of InIRA is only 2.3 m. However, benefitting from the low orbit, the signal-to-noise ratio of InIRA-acquired data is above 10 dB in most of the swath, which, to a certain extent, compensates for the short baseline deficiency. The altimetric precision is simulated based on the system parameters of InIRA. Results show that it is better than 7 cm on a 5-km grid and improves to 3 cm on a 10-km grid when the incidence is below 7.4 • . The interferometric data of InIRA are processed to estimate the altimetric precision after a series of procedures (including image coregistration, flat-earth-phase removal, system parameters calibration and phase noise suppression). Results show that the estimated altimetric precision is close to but lower than the simulated precision among most of the swath. The intensity boundary phenomenon is first found between the near range and far range of the SAR images of InIRA. It can be explained by the modulation of ocean internal waves or oil slick, which smooths ocean surface roughness and causes the modulated area to appear either brighter or darker than its surroundings. This intensity boundary phenomenon indicates that the available swath of high altimetric precision will be narrower than expected.

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“…In the coastal area, the environments are complex and the echoes data from these areas are contaminated by the land reflection signals. To solve such problem, scientists put forward some new radar altimeter systems, such as microsatellite Ka-band altimeter [9]- [11], wide-swath ocean altimeter [12], [13], and synthetic aperture radar altimeter (SARAL) [14]- [17].…”

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confidence: 99%

Height Precision of SAR Altimeter and Conventional Radar Altimeter Based on Flight Experimental Data

Lingwei

Liu

et al. 2016

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

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Compared with conventional radar altimeter (CRA), synthetic aperture radar altimeter (SARAL) is a new generation radar altimeter with better height precision and along-track spatial resolution. As using synthetic aperture technique, SARAL data processing and waveform model are very different from CRA. To verify the performance and the data processing algorithm, an airborne experimental system of SARAL is developed. The experimental system was installed in Y-12 aircraft, and some valid data was obtained in October 2014. The echo data with SAR mode is obtained in the experiment and the echo data of CRA mode is extracted from SAR mode data. The two modes have the same observation targets and error sources and, then, their height measurement precisions are comparable. The results indicate that the range measurement precision of SARAL is improved about 1 times. The difference of the significant wave heights from the SAR mode data and CRA mode data is negligible.Index Terms-Airborne flight experiment, conventional radar altimeter (CRA), height precision, SARAL.

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The wide swath ocean altimeter: radar interferometry for global ocean mapping with centimetric accuracy

Cited by 19 publications

References 4 publications

An assessment of the Ka band interferometric radar altimeter for monitoring rivers and lakes with the WatER mission

An assessment of the Ka band interferometric radar altimeter for monitoring rivers and lakes with the WatER mission

Performance Analysis of Ocean Surface Topography Altimetry by Ku-Band Near-Nadir Interferometric SAR

Height Precision of SAR Altimeter and Conventional Radar Altimeter Based on Flight Experimental Data

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