نتایج جستجو برای: altimeter
تعداد نتایج: 1652 فیلتر نتایج به سال:
Altimetry has become the focus of global climate studies because it is the only tool available able to provide both mesoscale (100-500 kIn) and basin-scale (10,000 kIn) circulation information on a global, synoptic basis. . The Atlas-launched Navy Geosat mission proved the capability of the radar altimeter to measure the mesoscale ocean features. A lightsat compatible Geosat Follow-On Technolog...
Past experiences with ERS and Topex/Poseidon altimeter data have shown that rain can significantly alter the quality of altimeter measurements (dynamic heights, significant wave heights, wind speed) [1][2][3][4]. Among all the different atmospheric phenomena which can affect the altimeter measurement, rain is one of the less well understood and at present no reliable correction can be made for ...
A comparison of signiicant wave heights H s was performed using satellite altimeter data available between 1978 to 1994 from SEASAT, GEOSAT, ERS-1 and TOPEX. The purpose was to estimate the degree of accuracy between the diierent instruments. Statistical properties of H s as obtained from the altimeters are found to be compatible with those from in situ measurements in the North Atlantic. All H...
The pseudo maximum likelihood estimator allows one to estimate the unknown parameters of Brown’s model for altimeter waveforms. However, the optimality of this estimator, for instance in terms of minimizing the mean square errors of the unknown parameters is not guarantied. Thus it is not clear whether there is some space for developing new estimators for the unknown parameters of altimetric si...
The BepiColombo Laser Altimeter (BELA) has been selected for flight on board the European Space Agency’s BepiColombo Mercury Planetary Orbiter (MPO). The experiment is intended to be Europe’s first planetary laser altimeter system. Although the proposed system has similarities to the Mercury Laser Altimeter (MLA) currently flying on board NASA’s MESSENGER mission to Mercury, the specific orbit ...
This report presents the results of an eight-month study of signal processing techniques applicable to the Geodetic Satellite Altimeter program. The first subject treated is the analysis of random errors in the altitude measurement process which arise from signal fluctuations and receiver noise. Results are presented based on both theoretical analyses and computer simulation of the altimeter co...
Water properties critical to our understanding and managing of freshwater systems change rapidly with depth. This work presents an Unmanned Aerial Vehicle (UAV) based method of keeping a passive, cable-suspended sensor payload at a precise depth, with 95% of submerged sensor readings within ±8.4 cm of the target depth, helping dramatically increase the spatiotemporal resolution of water science...
Two sources of H113 estimates were available at Platform Harvest; a NOAA buoy and CU depth sensor highrate data. H113 estimates from the NOAA buoy were based on twenty minutes of data every hour, CU pressure measurements were taken every 1.1 seconds. For purposes of this paper, H113 estimates from the (7U depth sensor were based on one hour of data, This paper compares H113 measurements from TO...
We combine the complementary characteristics of laser altimeter data and stereoscopic digital elevation models (DEMs) to construct high-resolution ( 100m) maps of surface elevations and elevation changes over rapidly changing outlet glaciers in Greenland. Measurements from spaceborne and airborne laser altimeters have relatively low errors but are spatially limited to the ground tracks, while D...
-This paper compares four cont/nental ice sheet radar altimeter retracking algorithms using airborne radar and laser altimeter data taken over the Greenland ice sheet in 1991. The refurbished Advanced Application Flight Experiment (AAFE) airborne radar altimeter has a large range window and stores the entire return waveform during flight. Once the return waveforms are retracked, or post-process...
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