Microwave radiometers form an integral part of satellite altimetry. The long-term stability of the radiometer measurements is as important to the accurate determination of sea level rise as is the long-term stability of the altimeter instrument. However, the radiometer stability has been largely taken for granted. Detailed long-term study of the brightness temperatures of ERS-1, ERS-2, TOPEX/Po...

Since some time several altimeter satellites are operating simultaneously (ENVISAT, Jason-1, ERS-2, GFO, TOPEX/Poseidon). The large number of nearly simultaneous crossover events are used to estimate in a common adjustment radial error components of all altimeter missions. A discrete representation is used for the radial error components by minimizing both, crossover differences and consecutive...

[1] A merged TOPEX/POSEIDON and ERS-1/2 altimeter data set is used to estimate nonseasonal variations of sea surface height (SSH) in the Japan/East Sea (JES) from October 1992 through February 2002. The altimeter data have a good correlation (0.95) with tide gauge data in the western JES. The nonseasonal variability of the SSH is higher in the southern warm region than in the northern cold regi...

The usability of altimeter sea level data (TOPEX/POSEIDON) and scatterometer wind data (QuikSCAT) in El Niño and the Southern Oscillation (ENSO) prediction is investigated with the latest version of the Lamont forecast model. The emphasis of this study is on the effectiveness of these data sets in initializing the model to forecast the 1999–2000 La Niña conditions. Both the altimeter and scatte...

The aim of the research was to develop an Unmanned Aerial Vehicle (UAV) hardware and software which can control a small size UAV (with 1–10 kg takeoff weight) from takeoff to landing. The research was based on AERObot V5 autopilot, developed and tested previously by us. AERObot can control a chosen aerial vehicle on a predefined route and altitude reliably but requires manual takeoff and landin...

Our earlier work on assessment of altimeter significant wave height (SWH) algorithms [...]

Probability density functions and conditional averages of velocity gradients derived from upper ocean observations are compared with results from forced simulations of the two-dimensional Navier-Stokes equations. Ocean data are derived from TOPEX satellite altimeter measurements. The simulations use rapid forcing on large scales, characteristic of surface winds. The probability distributions of...

This paper proposes a real-time navigation system for an AUV that takes advantage of the complementary performance of a sensor suite including a DVL, a compass, a depth sensor and altimeter sensors with a feature based motion estimator using vision. To allow for real-time performance of the vision based motion estimator a simple but fast correlation algorithm is used for feature matching. The c...