Given the known shortcomings in representing clouds in global climate models (GCMs), comparisons with observations are critical. The International Satellite Cloud Climatology Project (ISCCP) diagnostic products provide global descriptions of cloud-top pressure and column optical depth that extend over multiple decades. Given the characteristics of the ISCCP product, the model output must be con...

In this paper we present a simulator for GEO or MEObased communication systems. This simulator implements variable delay and bit error rate simulation and can be used to analyze communication scenarios involving one or more GEO/MEO or LEO spacecrafts and ground stations. First the paper gives a short overview over the original LEO simulator design from which the GEO simulator was derived. Then ...

This paper presents the evaluation performance of a hybrid satellite constellation network which provides internet access based on various Transport Control Protocol (TCP). Given known constraints on the hybrid satellite constellation resulting from network performance evaluation criteria. The evaluated satellite network uses the COMMStellation constellation topology operating on Low Earth Orbi...

An efficient algorithm that dynamically calculates all possible ray paths in outdoor (macroand micro-cells and land mobile satellite, LMS) and indoor environments is presented in this paper. The algorithm is based on the sweep line technique. Additionally a quadtree (bounding box [1]) division of the study environment is used to reduce search time. For indoor and microcellular environments wall...

GPS satellite simulator test facilities are used to checkout the software and hardware of GPS receivers and their augmentation systems. In general, they include satellite signal simulators, differential augmentation simulators and interface emulators. All testing is run in real time and requires considerable hardware and human assets. Initially, the dynamic scenario to be simulated must be desi...

Navigation signal simulator can generate signals consistent with real GNSS (Global Navigation Satellite System) signals, which can be processed by GNSS receivers in the same manner as it processes satellite signals in a real testing environment. The simulator can offer a high-fidelity means of testing GNSS receivers and other related systems. Such tests can be carried out in laboratories due to...

although the LEO constellation has dynamic satellite network topology, the topology changes are predictable and periodic. Based on the characteristics above, a new simple change adaptive routing algorithm (SCARA) is proposed for satellite IP networks. SCARA uses simple rules to decide the next hop. The rules are 1) using only two possible directions to reduce the routing path; 2) assigning high...