Chris Ray

Chris Ray
Cray Consulting

Ph.D. Theoretical Physics, University of California, Davis.

About

14
Publications
3,336
Reads
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321
Citations
Additional affiliations
January 2013 - present
isardSAT
Position
  • Senior Researcher
July 1996 - present
Saint Mary's College of California
Position
  • Professor (Full)

Publications

Publications (14)
Article
A new method of forming the synthetic aperture radar altimeter multilook backscattered power waveform is proposed for application over water. The method compensates the waveform for both variations in amplitude and dilation in range, which are caused by the geometry of the observation and the signal processing chain of the instrument. Using Cryosat...
Article
Full-text available
The backscatters power single-look waveform recorded by a synthetic aperture radar altimeter is approximated in a closed-form model. The model, being expressed in terms of parameterless functions, allows for efficient computation of the waveform and a clear understanding of how the various sea state and instrument parameters affect the waveform.
Article
Full-text available
The nonexponential decay of a correlation function in physical, chemical, or biomolecular complex systems is often taken as explicit evidence for disorder. Here we show that even without disorder, nonexponential relaxation can arise through a coupling of the primary relaxations to the ``invisible'' relaxations of the rest of the system.
Article
This article explores the modification and inclusion of different algorithms within an in-house Delay-Doppler processor (DDP) chain in order to understand their potentiality and the related impact in terms of geophysical retrievals’ precision, when operating the synthetic aperture radar (SAR) mode of CryoSat-2 mission over open ocean. To do so, a f...
Article
In this paper we analyze the effect of increasing the posting rate of delay/Doppler altimeters on the retrieval of open ocean geophysical parameters. The conventional posting rate for synthetic aperture radar altimeters data is 20 Hz, which on-ground corresponds to the typical delay/Doppler along-track resolution of about 320 meters. However, the s...
Conference Paper
Full-text available
During the last decade the radar altimetry has entered in its golden age as demonstrated by the different number of missions (Jason-3, CryoSat-2, SARAL/Altika, Sentinel-3a) currently operating and continuity missions planned for the near future (Sentinel-3b, Sentinel-6). The relatively new operational SAR mode in CryoSat-2 and Sentinel-3 missions,...
Poster
Full-text available
the core of this presentation intends to show the potential capabilities of the ACDC method when integrate in the CryoSat-2 and Sentinel-3 processing baselines, comparing the retrieved geophysical parameters with the conventional SAR processing baselines for both missions over FBR CryoSat-2 data on several tracks over open-ocean. Taking into accoun...
Presentation
Full-text available
SAR Altimetry algorithm improvements applied to the Sentinel-6/Jason-CS mission
Chapter
Hitting homeruns is a key factor in the sport of baseball. This paper presents an adaptation of a previous baseball impact and flight model to understand how optimal swing parameters (resulting in maximum range) vary for three levels of baseball play: Little League, high school, and college. The two parameters optimized describe the bat’s path to t...
Article
Full-text available
We analyze the complex networks associated with brain electrical activity. Multichannel EEG measurements are first processed to obtain 3D voxel activations using the tomographic algorithm LORETA. Then, the correlation of the current intensity activation between voxel pairs is computed to produce a voxel cross-correlation coefficient matrix. Using s...
Article
We describe the concept of a dry electrode sensor for biopotential measurement applications (ENOBIO) designed to eliminate the noise and inconvenience associated to the use of electrolytic gel. ENOBIO uses nanotechnology to remove gel-related noise, as well as maintaining a good contact impedance to minimise interference noise. The contact surface...
Article
Full-text available
In applying the stationary phase approximation to coherent state path integrals a difficulty occurs; there are no classical paths that satisfy the boundary conditions of the path integral. Others have gotten around this problem by reevaluating the action. In this work it is shown that it is not necessary to reevaluate the action because the station...
Article
This investigation adapts a previous model to examine optimal swing parameters resulting in maximum range at three levels of baseball play: Little League, high school, and college. The two parameters optimized describe the bat's path to the ball: E, the undercut distance between the center of the bat and ball; and ψ, the undercut angle. The purpose...

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