Due to its high-performance broadcast capability, -ary phase-shift-keying (MPSK) direct sequence code division multiple access (DS/CDMA) technique is widely used in terrestrial and satellite communications to provide wired/wireless services such as audio broadcasting, video broadcasting and high-speed data transmission. However, both coherent and noncoherent MPSK modulation schemes are sensitiv...

Abstract—This paper presents the effect of the orbit inclination on the pointing error of the satellite antenna and consequently on its footprint on earth for a typical Kuband payload system. The performance assessment is examined using both analytical simulations and practical measurements, taking into account all the additional sources of the pointing errors, such as East-West station keeping...

Tracking climate variables at the levels of precision and accuracy required to detect global change requires satellite sensors to make highly consistent measurements that can be compared to measurements made at different times and with different instruments. Gaps in climate data records, such as those resulting from launch delay or instrument failure, and inconsistencies in radiometric scales b...

The regional service of the Chinese BeiDou satellite navigation system is now in operation with a constellation including five Geostationary Earth Orbit satellites (GEO), five Inclined Geosynchronous Orbit (IGSO) satellites and four Medium Earth Orbit (MEO) satellites. Besides the standard positioning service with positioning accuracy of about 10 m, both precise relative positioning and precise...

Nowadays, within the space robotics, there is a substantial interest in achieving on-orbit satellite servicing operations autonomously. On-orbit servicing (OOS) requires ability to rendezvous and dock by an unmanned spacecraft minimizing human intervention. This paper is presented like a step in this course. In RoboticsLab, we have developed the RISANAR testbed to simulate scenarios of autonomo...

Chinese BeiDou Navigation Satellite System is officially operational as a regional constellation with five Geostationary Earth Orbit (GEO) satellites, five Inclined Geosynchronous Satellite Orbit (IGSO) satellites and four Medium Earth Orbit (MEO) satellites. Observations from the BeiDou Experimental Tracking Stations (BETS) and the IGS Multi-GNSS Experiment (MGEX) network from 1 January to 31 ...

It is well-known that vector delay and frequency locked loops (VDFLLs) have several advantages over traditional scalar tracking loops in GNSS receivers, especially in mobile platforms subject to poor signal environments and accelerations. This paper presents an approach to further VDFLL performance improvement for ground-based mobile receivers which apparently has not yet been exploited. The pe...

To track a cyclone using a single orbiting satellite in a continuous manner is impractical as it has limited spatial and temporal coverage. One solution is to use multiple orbiting satellites for cyclone tracking. However, data from some orbiting satellites do not provide features as useful as other satellites in identifying cyclones. Moreover, satellite data containing strong cyclone discrimin...

This paper investigates the image-based characterization of the land mobile satellite (LMS) channel. For a comprehensive multi-satellite model, a traditional measurementbased approach is not feasible due to the lack of available satellites at all possible orbital positions and the drawbacks of the measurement system when a high gain tracking antenna is involved (e.g. Ka/Ku band). To overcome th...