ENVISAT radar altimeter tracker bias
ENVISAT radar altimeter tracker bias
In the past, errors in the determination of the orbit were dominant in radar altimeter missions, but technical advances have improved the orbit accuracy and hence, other sources of error have become more important. Sea-state bias is now the main source of error and can be divided into three sea-state dependent errors: skewness, electromagnetic bias, and tracker bias. We estimated the magnitude of the third term, by retracking ocean waveforms from ENVISAT RA-2. The retracking algorithm used is based on Maximum Likelihood Estimation. Tracker bias shows a seasonal and geographical dependence related to the distribution of significant wave height (SWH) and time origin differences. We estimated amean value of 0.13±0.07% SWH. Temporal and regional dependent errors are introduced when using a linear retracker processing approach.
altimetry, ocean retracking, maximum likelihood estimation, tracker bias
19-38
Gomez-Enri, J.
52626f7d-16f6-4d53-99bc-82ea43d90aef
Gommenginger, C.P.
f0db32be-34bb-44da-944b-c6b206ca4143
Challenor, P.G.
a7e71e56-8391-442c-b140-6e4b90c33547
Srokosz, M.A.
1e0442ce-679f-43f2-8fe4-9a0f0174d483
Drinkwater, M.R.
c4e41711-4194-4f7e-8e2f-54e2d0dc0a58
2006
Gomez-Enri, J.
52626f7d-16f6-4d53-99bc-82ea43d90aef
Gommenginger, C.P.
f0db32be-34bb-44da-944b-c6b206ca4143
Challenor, P.G.
a7e71e56-8391-442c-b140-6e4b90c33547
Srokosz, M.A.
1e0442ce-679f-43f2-8fe4-9a0f0174d483
Drinkwater, M.R.
c4e41711-4194-4f7e-8e2f-54e2d0dc0a58
Gomez-Enri, J., Gommenginger, C.P., Challenor, P.G., Srokosz, M.A. and Drinkwater, M.R.
(2006)
ENVISAT radar altimeter tracker bias.
Marine Geodesy, 29 (1), .
(doi:10.1080/01490410600582296).
Abstract
In the past, errors in the determination of the orbit were dominant in radar altimeter missions, but technical advances have improved the orbit accuracy and hence, other sources of error have become more important. Sea-state bias is now the main source of error and can be divided into three sea-state dependent errors: skewness, electromagnetic bias, and tracker bias. We estimated the magnitude of the third term, by retracking ocean waveforms from ENVISAT RA-2. The retracking algorithm used is based on Maximum Likelihood Estimation. Tracker bias shows a seasonal and geographical dependence related to the distribution of significant wave height (SWH) and time origin differences. We estimated amean value of 0.13±0.07% SWH. Temporal and regional dependent errors are introduced when using a linear retracker processing approach.
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Published date: 2006
Keywords:
altimetry, ocean retracking, maximum likelihood estimation, tracker bias
Identifiers
Local EPrints ID: 44026
URI: http://eprints.soton.ac.uk/id/eprint/44026
ISSN: 0149-0419
PURE UUID: 273165de-f31c-4cac-bb5a-abdbf10ec419
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Date deposited: 07 Feb 2007
Last modified: 15 Mar 2024 08:59
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Contributors
Author:
J. Gomez-Enri
Author:
C.P. Gommenginger
Author:
P.G. Challenor
Author:
M.A. Srokosz
Author:
M.R. Drinkwater
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