Simulated radar signatures within the melting layer in stratiform rain, namely the radar bright band, are checked by means of comparisons with simultaneous measurements of the bright band made by the EDOP (X-band) and CRS (W-band) airborne Doppler radars during the CRYSTALFACE campaign in 2002. A stratified-sphere model, allowing the fractional water content to vary along the radius of the part...

Broadband satellite communication networks, operating at Ka band and above, play a vital role in today’s worldwide telecommunication infrastructure. The problem, however, is that rain can be the most dominant impairment factor for radio propagation at these frequencies. This paper, addresses bandwidth and time-slot allocation problem for rain faded DVBRCS satellite networks. We formulate the ta...

This paper presents a novel adaptive predistortion technique for general cross-coupled microwave/RF filters with improved insertion loss and group-delay equalization. The method enables many potential applications of an almost abandoned technique, and permits a lower implementation technology to emulate the performance of a higher filter. 10–4–4 filters were built and tested at and -band to ver...

The Flying Laptop is a micro-satellite currently under development by the Institute of Space Systems. Several promising technologies will be implemented. A high agile attitude control system with a pointing knowledge better than 7 arcseconds, operating in a target pointing mode for image acquisition is necessary to achieve the planned scientific measurements. For communication a high speed Ka-b...

In this paper, we implement the robust demodulator for mobile broadband satellite internet access systems. Especially, in order to achieve the good synchronization under very low SNR, a large frequency offset, and Doppler frequency offset with constraints of mobile satellite communication, we introduce the efficient carrier freq. offset estimating algorithm and the carrier phase estimating algo...

Tropospheric scintillation can seriously aaect satellite links operating at Ka-band. The average bit error probability for a multiuser binary direct-sequence spread-spectrum satellite communication network operating under amplitude scintillation is evaluated. Numerical results are presented to illustrate performance comparisons of systems operating under typical scintillation statistics. As in ...

gravity recovery and climate experiment (grace) satellite gravimetry mission launched in march 2002 based on its twin gravimetric satellites makes application of both high-low (hl) and law-low (ll) gravimetric techniques possible. the ll is based on satellite-to-satellite tracking (sst) via the one way two frequencies k-band-ranging between the two grace satellites. as a result of combination o...

Title of dissertation: MULTICAST COMMUNICATION SUPPORT OVER SATELLITE NETWORKS Gün Akkor, Doctor of Philosophy, 2005 Dissertation directed by: Professor John S. Baras Department of Electrical and Computer Engineering In this dissertation, we focus on providing multicast communication support over satellite networks. We investigate the possible performance enhancements in terms of the throughput...

We analyzed two convective storms that passed over or near the Milešovka meteorological observatory. The observatory is located at top of a hill and has been recently equipped with Doppler polarimetric X-band radar FURUNO WR2120 for cloud investigations. Our analysis was based mainly on data measured in vertical cross-sections (RHI-Range-Height Indicator). Radar also used classifying hydrometeo...

Traditionally, Kuand C-band radars are used in ocean scatterometry to retrieve an ocean wind vector. Examples are QuikSCAT and ASCAT satellites. Recently, attempts have been made to use X-band SAR aboard the German TerraSAR-X satellite for the same purpose [1]. Usually, wind retrieval is performed using empirical Geophysical Model Functions (GMF). In the past, a set of GMFs have been designed b...