Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 6 of 6 for “"nadir-pointing"”.
-
Magnetic Stabilization of Nadir-Pointing Small Satellites
… control laws that achieve three-axis stabilized nadir-pointing attitude. Two types of nonlinear feedback control laws are proposed: full-state feedback and passivity-based feedback. Full-state feedback uses the attitude and angular velocity measurements to regulate the spacecrafts dynamics. …
-
Translational and Rotational Control of an Asteroid Orbiting Satellite
… design. The control objective is to maintain a nadir pointing attitude on a circular equatorial orbit. Using established control design techniques, feedback laws are constructed to control both rotational and translational motion of the satellite so that the control objective is achieved. …
-
A clutter power computation procedure for airborne Doppler radar
… are studied for two different situations: near nadir pointing, and near horizon pointing. The manner in which the matched filter ambiguity function and the spectrum of backscattered power combine to produce these waveforms is examined.
-
Improvements to the modelling of radiowave propagation at millimetre wavelengths. In-depth studies are reported on resonance phenomena in the scattering of spherical ice particles, extinction and backscattering properties of clouds and on the absorption and dispersion spectra of atmospheric gases.
… from various cloud types are calculated for a nadir pointing fixed beam millimetre wave radar operating at 94 GHz. The physics and application of the equation of radiative transfer to millimetre wave propagation in the earth's atmosphere are given and also is the solution of this equation for a …
-
Closed Loop Analysis of Space Systems (CLASS) a modular test system for small satellite verification and validation
… the design of a state feedback controller for nadir pointing, identifying hardware limitations, and enabling the correction of software errors. CLASS will serve as a general purpose and easily configurable test system for all CubeSats and space systems developed at the University of Illinois.
-
Aerosols and boundary layer structure over Arctic sea ice based on airborne lidar and dropsonde measurements
… troposphere and the ABL were measured with the nadir pointing Airborne Mobile Aerosol Lidar (AMALi) and dropsondes were launched to obtain profiles of meteorological variables. Furthermore, in situ measurements of aerosol properties, meteorological variables and turbulence were part of the …