SUMMARYI present a novel analytical study of the signal-to-noise-plus-interference ratio (SNIR) for Ka-band high throughput satellite uplink channels. The Ka-band high throughput satellite systems employ frequency and polarization (color) reuse among the spot beams to achieve throughput increase many times the throughput of the system without reuse. However, color reuse also produces substantial co-color interference and adding to it, tropospheric precipitation attenuation rises sharply in Ka-band. The co-color interference and precipitation induced fading vary randomly; they degrade the system performances. To assess the impact, I develop the uplink channel SNIR probability model in this study. Compared with the known studies of the same topic, this study takes the theoretic approach and is applicable to the urban users in particular. The model is feasible to implement and can provide accurate assessment of the channel SNIR performances statistically in theory for a wide array of system operational scenarios. The SNIR probability model is applied to a model spot beam system of 101 user beams to obtain and compare sample channel performances, which can be used for making system design choices at the early stage of a satellite project.

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Abstract. Urban building outline is not only a very important land cover type, but also the key of studying urban building. It is significance on urban construction planning and natural disasters monitoring. This paper discussed the method for building information extracting according to high-resolution SAR coherence image. Through theoretical analysis and test verifying, it had obtained a better effect for extracting the buildings' profiles or top figures from the coherence image, which often expressed as 'L'-style top structures from SAR SLC image. This method has been proved the further potential in extracting urban buildings' structure and profile information, and has some extent of reference means.

We assess the effect of IF filters on the BER performance of a narrowband PCS through laboratory experimentation and analysis. We found that a Butterworth with cascaded phase equalizer and an equiripple group delay showed improvements over the optimal Bessel-Butterworth cascade in the forward and reverse channels, respectively. Equiripple Maximallv Flat