Abstract
Communication impairment on the Mobile Satellite (MS) path for non-geostationary satellite is mainly due to effect of multipath and shadowing. In order to study the signal quality received by the MS user, a receiver system that has similar characteristics to the actual receiver used by the MS user should be used. This study presents a novel approach to determine the MS signal quality by using a portable, handheld and commercially available Global Positioning System (GPS) receiver with built-in small-size antenna that imitates the actual receiver used by the MS users. It offers a low-cost and simple to manage method of studying the MS environment. Propagation data for the open space environment are measured and used as reference to determine the MS signal quality for the tree shadowed and building shadowed environments. Comparisons are made with the results obtained using different type of receiver system to show the feasibility of this type of receiver.
Highlights
Two main sources of signal degradation in the Mobile Satellite (MS) system are shadowing effect and multipath fading
The Global Positioning System (GPS) system used comprised of high performance GPS receiver with highly sensitive externally connected GPS antenna[3,4,5,6] designed for the purpose of doing experimental work
These fading characteristics have a very good agreement between each other which imply that the fading characteristics for the open space environment are the same without the presence of significant obtained by Lin[6] for outdoor scenario in which a sensor board type of GPS receiver has been used in the experimental work
Summary
Two main sources of signal degradation in the MS system are shadowing effect and multipath fading. Many investigations have been performed at different frequency bands[1,2] and have addressed issues such as the effect of shadowing and multipath on the MS signal. Investigations done using the existing geo-satellite system or airborne platform[1,2] are complex and costly which prevent more experimental works to be carried out for different region in the world. With this method, the cost and complexity will be greatly reduced
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