نتایج جستجو برای: altimeter

تعداد نتایج: 1652  

Journal: :Science 2006
David E Smith Maria T Zuber Xiaoli Sun Gregory A Neumann John F Cavanaugh Jan F McGarry Thomas W Zagwodzki

Here we report timed observations with subnanosecond precision of short laser pulses at a distance of nearly 24 million kilometers between the Mercury Laser Altimeter (MLA) aboard the MESSENGER (MErcury Surface, Space ENvironment, GEochemistry, and Ranging) spacecraft and the NASA Goddard Geophysical and Astronomical Observatory (GGAO). Forty MLA downlink observations and 90 uplink observations...

Journal: :Remote Sensing 2023

Corrections to altimeter-measured sea surface height anomalies (SSHA) have a larger proportional effect for synthetic aperture radar (SAR) altimetry than conventional, pulse-limited because of lower range noise. Here, we quantified the impact current generation altimeter corrections in coastal zone Northwest Atlantic, region with significant dynamic activity. In this study, used level variance ...

Journal: :IEEE Transactions on Geoscience and Remote Sensing 1994

Journal: :Journal of Geophysical Research: Oceans 2015

Journal: :Advances in Space Research 2021

Satellite radar altimetry collected during a number of geodetic missions has provided new understanding the topography and tectonics deep oceans. As altimeter performance coverage improves, smaller structures are revealed. Here we investigate contribution six that have been placed into mapping phases for more than one year. Two types evaluations performed. We first compare composite (all altime...

Journal: :Journal of Geophysical Research: Oceans 1998

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