The Harvest Experiment: Calibration of the Climate Data Record from TOPEX/Poseidon, Jason-1 and the Ocean Surface Topography Mission

Haines, Bruce; Desai, S. D.; Born, George H.

doi:10.1080/01490419.2010.491028

Cited by 78 publications

(32 citation statements)

References 40 publications

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“…The ICF autocorrelation function of a Direct TV signal re ected from a river surface has been shown to be a Gaussian function. In order to establish a relation coherence time and SWH, an experimental campaign at Platform Harvest (34.469092 • N, 120.682135 • W) [20] is being planned. This experimental campaign will be used to develop a tower-based passive remote sensing instrument for calibration and validation (cal/val) of future NASA decadal survey missions along coasts.…”

Section: Discussionmentioning

confidence: 99%

Correlation properties of direct broadcast signals for bistatic remote sensing

Shah

Garrison

2012

2012 IEEE International Geoscience and Remote Sensing Symposium

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In this paper, we present a study of relevant correlation properties of signals transmitted from commercial DirecTV satellite signals with the purpose of evaluating their potential use as "signals of opportunity" for bistatic remote sensing. The ambiguity function of the DirecTV satellite signal is computed analytically from published information on the modulation schemes and bandwidth, under the assumption that the data modulation is random. This model is experimentally tested by recording the received signals from the satellites. Also, the signal to noise ratio (SNR) is computed from the published information. The coherence time of the DirecTV signal is computed using the experimental data from two direct signals that is recorded with two different clock sources. An experiment is done to record some re ected data from a river and the coherence time of the Interferometric Complex Field (ICF) from this re ected data is computed for the purposes of measuring the sea state.

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Section: Discussionmentioning

confidence: 99%

Correlation properties of direct broadcast signals for bistatic remote sensing

Shah

Garrison

2012

2012 IEEE International Geoscience and Remote Sensing Symposium

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“…When this empirical correction is applied to the J1 SSH measurements it effectively levels them to those from J2. Absolute calibrations show that the J2 SSH measurements are biased 84-88 mm higher than those from J1, due principally to systematic differences in the altimeter range measurements (e.g., Haines et al 2010;Bonnefond et al 2010). Meanwhile, global comparisons indicate a relative SSH bias of 75 mm (Willis 2009).…”

Section: Orbit Altitude Correction = A(t) + B(t)cos(ωt) + C(t)sin(ωt)mentioning

confidence: 97%

Precise Near-Real-Time Sea Surface Height Measurements from the Jason-1 and Jason-2/OSTM Missions

Desai¹,

Haines²

2010

Marine Geodesy

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Precise measurements of sea surface height from the Jason-1 and Jason-2/Ocean Surface Topography Mission satellite altimeter missions are being generated within seven and four hours, respectively, of real time by applying high accuracy orbit altitudes to their near-real-time altimetry products. The near-real-time orbit altitudes have respective accuracies of <2 and <1 cm (RMS), and the corresponding sea surface height measurements have accuracies of <4.0 and <3.5 cm, respectively. These near-real-time orbit solutions are computed using GPS-based precise orbit determination for Jason-2, and Jason-1/Jason-2 sea surface height crossover differences for Jason-1.

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“…This site has been chosen to conduct experiments to test the fundamentals of the models in Section II, derive the necessary semi-empirical relationships in (11) and (13), and evaluate the accuracy of SWH retrievals. Platform Harvest has a 17-year calibration record for precise spaceborne altimetry for TOPEX/Poseidon, Jason-1, and Jason-2 [14].…”

Section: Experimental Campaign At Platform Harvestmentioning

confidence: 99%

“…Equations (14) and (15) were implemented using circular correlation. 120 autocorrelation functions were then incoherently averaged producing once per minute An initial value of the coherence time was determined by finding the value at which the autocorrelation function drops to the value:…”

Section: A Data Postprocessingmentioning

confidence: 99%

Application of the ICF Coherence Time Method for Ocean Remote Sensing Using Digital Communication Satellite Signals

Shah

Garrison

2014

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

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This paper applies an ocean remote sensing method, first developed for reflected Global Navigation Satellite System (GNSS-R) signals, to reflected digital communication satellite signals. The fundamental observation is the time series of the Interferometric Complex Field (ICF) of the reflected signal. A relationship is derived between the coherence time of the ICF time series and the significant wave height (SWH) and mean wave period (MWP) of the ocean. Direct and reflected signals from the S-band satellite transmissions providing the commercial XM radio service were recorded at Platform Harvest over a 65-day period. In situ measurements from a nearby buoy were used to calibrate this measurement by determining coefficients of a semi-empirical model. SWH retrievals using this model on 1 min of reflected signal observations were found to have a standard deviation of 0.38 m over the range from 1 to 4.5 m. An error analysis was done to show that the primary contribution to this error was uncertainty in the relationship between MWP and SWH, and to quantify the retrieval error from different forward models.

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The Harvest Experiment: Calibration of the Climate Data Record from TOPEX/Poseidon, Jason-1 and the Ocean Surface Topography Mission

Cited by 78 publications

References 40 publications

Correlation properties of direct broadcast signals for bistatic remote sensing

Correlation properties of direct broadcast signals for bistatic remote sensing

Precise Near-Real-Time Sea Surface Height Measurements from the Jason-1 and Jason-2/OSTM Missions

Application of the ICF Coherence Time Method for Ocean Remote Sensing Using Digital Communication Satellite Signals

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