Using the capability approach to detect design opportunities

When developing products and services to improve the well-being of the multidimensional poor, designers need deep contextual insight. However, literature does not specify which topics to discuss or which questions to ask. We used Sen’s capability approach to develop question categories and specific questions, and we selected tools to support...

Approaching design for development from a capability perspective

To improve the well-being of disadvantaged and marginalized populations by product design, deep contextual insight is required. However, literature does not specify which topics to discuss or which questions to ask. To address this issue, we used Sen’s capability approach to develop question categories and adopted a semi-structured interview...

GNSS ambiguity resolution: Which subset to fix?

A key issue with GNSS carrier phase ambiguity resolution is that often the full set of ambiguities cannot be fixed fast and reliably. A possible strategy is then to resolve only a subset of ambiguities, one for which the probability of correct fixing, the so-called success rate, is sufficiently close to 1. However, a proper subset selection...

Altimetry with GNSS-R interferometry: First proof of concept experiment

The Global Navigation Satellite System Reflectometry (GNSS-R) concept was conceived as a means to densify radar altimeter measurements of the sea surface. Until now, the GNSS-R concept relied on open access to GNSS transmitted codes. Recently, it has been proposed that the ranging capability of the technique for ocean altimetric applications can...

Short and zero baseline analysis of GPS L1 C/A, L5Q, GIOVE E1B, and E5aQ signals

Stochastic properties of GNSS range measurements can accurately be estimated using a geometry-free short and zero baseline analysis method. This method is now applied to dual-frequency measurements from a new field campaign. Results are presented for the new GPS L5Q and GIOVE E5aQ wideband signals, in addition to the GPS L1 C/A and GIOVE E1B...

VPRO's Beagle II ocean clipper and GPS; measuring sea level technology by means of GPS onboard the Clipper Stad Amsterdam in the Indian Ocean

InSAR based validation of MERIS IWV cloud gap filling using GPS IWV

High spatial resolution integrated water vapor (IWV) estimates are available from the MERIS spectrometer on board of Envisat. Unfortunately cloud cover results in loss of a large amount of MERIS IWV pixels. Here methods are presented for filling cloud gaps in MERIS IWV scenes, first, by directly interpolating remaining pixels not affected by...

Validating time series of a combined GPS and MERIS Integrated Water Vapor product

Increased knowledge of atmospheric water vapor can improve weather predictions and is expected to reduce errors in products derived from GPS and (In)SAR data. At GPS ground stations Integrated Water Vapor (IWV) is estimated from the GPS signal delay with a high temporal resolution. The Envisat MERIS spectrometer obtains spatially dense IWV...

Geometry-free undifferenced, single and double differenced analysis of single frequency GPS, EGNOS and GIOVE-A/B measurements

This paper demonstrates a geometry-free GNSS measurement analysis approach and presents results of single frequency GPS, EGNOS and GIOVE short and zero baseline measurements. The purpose is to separate the different contributions to the measurement noise of pseudo range code and carrier phase observations at the receiver. The influence of...

Terahertz polarization imaging

We present a new method to measure the polarization state of a terahertz pulse by using a modified electrooptic sampling setup. To illustrate the power of this method, we show two examples in which the knowledge of the polarization of the terahertz pulse is essential for interpreting the results: spectroscopy measurements on polystyrene foam and...

On the "Great circle reduction" in the data analysis for the astrometric satellite hipparcos

Verslag behorende bij het processchema over de bereiding van phtaalzuuranhydride

Document(en) uit de collectie Chemische Procestechnologie