Undulation and anomaly estimation using Geos-3 altimeter data without precise satellite orbits

1977 ◽  
Vol 51 (1) ◽  
pp. 73-88 ◽  
Author(s):  
R. Rummel ◽  
R. H. Rapp
Keyword(s):  
Altimeter Data ◽  
Satellite Orbits

Impact of Multialtimeter Sea Level Assimilation in the Mediterranean Forecasting Model

2010 ◽  
Vol 27 (12) ◽  
pp. 2065-2082 ◽  
Author(s):  
M.-I. Pujol ◽  
S. Dobricic ◽  
N. Pinardi ◽  
M. Adani
Keyword(s):  
Sea Level ◽  
Positive Impact ◽  
Model Simulation ◽  
Horizontal Resolution ◽  
Altimeter Data ◽  
Forecasting Model ◽  
Satellite Orbits ◽  
Sea Level Anomaly ◽  
Ocean Topography ◽  
The Impact

Abstract In this article the impact of multisatellite altimeter observations assimilation in a high-resolution Mediterranean model are analyzed. Four different altimeter missions [Jason-1, Envisat, Ocean Topography Experiment (TOPEX)/Poseidon interleaved and Geosat Follow-On] are used over a 7-month period (from September 2004 to March 2005) to study the impact of the assimilation of one to four satellites on the analyses quality. The study highlights three important results. First, it shows the positive impact of the altimeter data on the analyses. The corrected fields capture missing structures of the circulation, and eddies are modified in shape, position, and intensity with respect to the model simulation. Second, the study demonstrates the improvement in the analyses induced by each satellite. The impact of the addition of a second satellite is almost equivalent to the improvement given by the introduction of the first satellite: the second satellite’s data bring a 12% reduction of the root-mean-square of the differences between the analyses and observations for the sea level anomaly (SLA). The third and fourth satellites also improve the rms, with a more than 3% reduction for each of them. Finally, it is shown that Envisat and Geosat Follow-On additions to Jason-1 impact the analyses more than the addition of TOPEX/Poseidon, suggesting that the across-track spatial resolution is still one of the important aspects of a multimission satellite observing system. This result could support the concept of multimission altimetric monitoring done by complementary horizontal resolution satellite orbits.

Using the Along-Track Altimeter Data for a Verification of the Numerical Wave Models

2018 ◽  
pp. 20-31
Author(s):  
V. Polnikov ◽  
◽  
F. Pogarsky ◽  
N. Zilitinkevich ◽  
A. Kubryakov ◽  
...  
Keyword(s):  
Altimeter Data ◽  
Numerical Wave ◽  
Wave Models ◽  
Along Track

A Feasibility Demonstration of Ocean Model Eddy-resolving Nowcast/Forecast Skill Using Satellite Altimeter Data

2000 ◽  
Author(s):  
Harley E. Hurlburt ◽  
Robert C. Rhodes ◽  
Charlie N. Barron ◽  
E. J. Metzger ◽  
Ole M. Smedstad
Keyword(s):  
Ocean Model ◽  
Forecast Skill ◽  
Altimeter Data ◽  
Satellite Altimeter ◽  
Satellite Altimeter Data

Thermosphere Density Variability, Drag Coefficients, and Precision Satellite Orbits

2013 ◽  
Author(s):  
Craig A. McLaughlin ◽  
Dhaval M. Krishna ◽  
Piyush M. Mehta ◽  
Travis Lechtenberg ◽  
Andrew Hiatt ◽  
...  
Keyword(s):  
Satellite Orbits ◽  
Drag Coefficients

Technique for Conducting a Space Experiment with Auroral Imagers in Satellite Orbits

2020 ◽  
Vol 58 (5) ◽  
pp. 357-364
Author(s):  
M. A. Banshchikova ◽  
V. A. Avdyushev ◽  
A. K. Kuzmin
Keyword(s):  
Space Experiment ◽  
Satellite Orbits

scholarly journals Alignment determination of the Hayabusa2 laser altimeter (LIDAR)

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Hirotomo Noda ◽  
Hiroki Senshu ◽  
Koji Matsumoto ◽  
Noriyuki Namiki ◽  
Takahide Mizuno ◽  
...  
Keyword(s):  
Altimeter Data ◽  
Gravity Assist ◽  
Laser Altimeter ◽  
Trajectory Error ◽  
Flight Data ◽  
Camera Image ◽  
Operation Period ◽  
The Cross ◽  
Along Track

AbstractIn this study, we determined the alignment of the laser altimeter aboard Hayabusa2 with respect to the spacecraft using in-flight data. Since the laser altimeter data were used to estimate the trajectory of the Hayabusa2 spacecraft, the pointing direction of the altimeter needed to be accurately determined. The boresight direction of the receiving telescope was estimated by comparing elevations of the laser altimeter data and camera images, and was confirmed by identifying prominent terrains of other datasets. The estimated boresight direction obtained by the laser link experiment in the winter of 2015, during the Earth’s gravity assist operation period, differed from the direction estimated in this study, which fell on another part of the candidate direction; this was not selected in a previous study. Assuming that the uncertainty of alignment determination of the laser altimeter boresight was 4.6 pixels in the camera image, the trajectory error of the spacecraft in the cross- and/or along-track directions was determined to be 0.4, 2.1, or 8.6 m for altitudes of 1, 5, or 20 km, respectively.

scholarly journals Satellite Investigation of Semidiurnal Internal Tides in the Sulu-Sulawesi Seas

2021 ◽  
Vol 13 (13) ◽  
pp. 2530
Author(s):  
Xiaoyu Zhao ◽  
Zhenhua Xu ◽  
Ming Feng ◽  
Qun Li ◽  
Peiwen Zhang ◽  
...  
Keyword(s):  
Interference Pattern ◽  
Energy Flux ◽  
Internal Tide ◽  
Tidal Energy ◽  
Internal Tides ◽  
Altimeter Data ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Sulu Sea ◽  
Tidal Energy Flux

The mode-1 semidiurnal internal tides that emanate from multiple sources in the Sulu-Sulawesi Seas are investigated using multi-satellite altimeter data from 1993–2020. A practical plane-wave analysis method is used to separately extract multiple coherent internal tides, with the nontidal noise in the internal tide field further removed by a two-dimensional (2-D) spatial band-pass filter. The complex radiation pathways and interference patterns of the internal tides are revealed, showing a spatial contrast between the Sulu Sea and the Sulawesi Sea. The mode-1 semidiurnal internal tides in the Sulawesi Sea are effectively generated from both the Sulu and Sangihe Island chains, forming a spatially inhomogeneous interference pattern in the deep basin. A cylindrical internal tidal wave pattern from the Sibutu passage is confirmed for the first time, which modulates the interference pattern. The interference field can be reproduced by a line source model. A weak reflected internal tidal beam off the Sulawesi slope is revealed. In contrast, the Sulu Island chain is the sole energetic internal tide source in the Sulu Sea, thus featuring a relatively consistent wave and energy flux field in the basin. These energetic semidiurnal internal tidal beams contribute to the frequent occurrence of internal solitary waves (ISWs) in the study area. On the basis of the 28-year consistent satellite measurements, the northward semidiurnal tidal energy flux from the Sulu Island chain is 0.46 GW, about 25% of the southward energy flux. For M2, the altimetric estimated energy fluxes from the Sulu Island chain are about 80% of those from numerical simulations. The total semidiurnal tidal energy flux from the Sulu and Sangihe Island chains into the Sulawesi Sea is about 2.7 GW.

Seasonal variability of mesoscale eddies in the Banda Sea inferred from altimeter data

2020 ◽  
Vol 39 (12) ◽  
pp. 11-20
Author(s):  
Baiyang Chen ◽  
Lingling Xie ◽  
Quanan Zheng ◽  
Lei Zhou ◽  
Lei Wang ◽  
...  
Keyword(s):  
Seasonal Variability ◽  
Mesoscale Eddies ◽  
Altimeter Data

scholarly journals King-Hele orbit theory for periodic orbit and attitude variations

2020 ◽  
Vol 501 (1) ◽  
pp. 1168-1187
Author(s):  
Vishal Ray ◽  
Daniel J Scheeres
Keyword(s):  
Drag Coefficient ◽  
Dynamic Parameter ◽  
Mission Design ◽  
Fourier Series Expansion ◽  
Satellite Orbits ◽  
Physical Interaction ◽  
Satellite Mission ◽  
Simplifying Assumptions ◽  
Time Variations ◽  
Specific Factors

ABSTRACT The analytical theory of satellite orbits in an atmosphere developed by King-Hele remains widely in use for satellite mission design because of its accurate approximation to numerical integration under simplifying assumptions. Over the course of six decades, modifications to the theory have addressed many of its weaknesses. However, in all subsequent modifications of the original theory, the assumption of a constant drag-coefficient has been retained. The drag-coefficient is a dynamic parameter that governs the physical interaction between the atmosphere and the satellite and depends on ambient as well as satellite specific factors. In this work, Fourier series expansion models of the drag-coefficient are incorporated in the original King-Hele theory to capture time-variations of the drag-coefficient in averaging integrals. The modified theory is validated through simulations that demonstrate the attained improvements in approximating numerical results over the original King-Hele formulation.

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