PRETTY – passive GNSS-Reflectometry for CubeSats

Spaceborne Receiver Design for Scatterometric GNSS Reflectometry

Passive Reflectometry

Different materials reflect light in different ways, so reflectance is a useful surface descriptor. Existing systems for measuring reflectance are cumbersome, however, and although the process can be streamlined using cameras, projectors and clever catadioptrics, it generally requires complex infrastructure. In this paper we propose a simpler method for inferring reflectance from images, one th...

The Impact of Inter-Modulation Components on Interferometric GNSS-Reflectometry

The interferometric Global Navigation Satellite System Reflectometry (iGNSS-R) exploits the full spectrum of the transmitted GNSS signal to improve the ranging performance for sea surface height applications. The Inter-Modulation (IM) component of the GNSS signals is an additional component that keeps the power envelope of the composite signals constant. This extra component has been neglected ...

GNSS Reflectometry and Remote Sensing: New Objectives and Results

The Global Navigation Satellite System (GNSS) has been a very powerful and important contributor to all scientific questions related to precise positioning on Earth’s surface, particularly as a mature technique in geodesy and geosciences. With the development of GNSS as a satellite microwave (L-band) technique, more and wider applications and new potentials are explored and utilized. The versat...

Sea level observations using multi-system GNSS reflectometry

Information on sea level and its changes are important in connection to global climate change processes. For centuries, sea level has been observed with coastal tide gauges and since some decades with satellite altimetry. Furthermore, during recent years the application of Global Navigation Satellite System (GNSS) reflectometry, also known as GNSS-R, for sea level observations has been develope...