Modeling of interferences on other satellites in maritime satellite communications

Abstract

In maritime mobile satellite communications, mechanically controlled tracking systems are used to compensate changes of antenna orientation due to changes of a ship attitude caused by waves or winds of the sea. Orientations of antennas on a ship are limited so that transmitted electromagnetic waves are not affected by structures on the ship. Thus it is allowed to transmit waves when a clearance angle is greater than certain criteria. Our group has researched about fundamental relation between clearance angles and interferences for other satellites or other systems on the ship by numerical simulations for a simplified model. In this report, a realistic ship model is assumed for the simulations. As a result, a clearance angle, which interferences to the receiving satellite are small, has been found out under the conditions of the simulations. A simple model which describes interferences to received levels of the aiming and neighboring satellites is presented.

Hybrid Satellite-Terrestrial Communication Networks for the Maritime Internet of Things: Key Technologies, Opportunities, and Challenges

“…Further, the use of multi-spot beams allows beams that are far apart to reuse frequency. Frequency reuse is an effective way to improve spectral efficiency, but it may generate strong inter-beam interference due to the non-zero side lobes [179]. Therefore, side lobe suppression technologies are required for the use of multi-spot beams, and there is a trade-off between the number of spot beams and the distance between frequency-reuse beams [180][181].…”

“…improving the efficiency of ship-to-ship communications multiple antennas multiple directional antennas [141] virtual MIMO technologies [143] resource allocation distributed adaptive time slot allocation [147], cognition-enhanced mesh MAC protocol [148] ship-borne BS sleeping control and power allocation [172] utilizing high-throughput satellites improving the throughput of satellite-to-ship communications smart antennas smart satellite terminals [177][178] phased array antennas [181]- [183] satellite-MANET coordination network protocol intelligent middleware and link-specific protocol [185] multi-hop routing protocol [186] backhaul link selection algorithm [187] extending the coverage of a single BS reducing propagation loss directional beams MIMO transmit diversity and multiplexing [200] location-aware dynamic beam scheduling [201] achieving over-the-horizon communications microwave scattering experimental microwave links [203] novel lightweight antennas [204] interference alleviation interference analysis interference modelling modelling of interferences on other satellites in maritime satellite communications [179] interference simulation analysis and simulation of interference produced to the fixed service receivers by the mobile satellite service [180] analysing the co-channel interference from maritime mobile earth station to 5G mobile service [212][213] interference coordination resource allocation pilot scheduling and power allocation [216] radio resource block allocation [218] between the satellite and the terrestrial network, study the optimal beam design method, or suppress inter-beam interference.…”

“…In [211], an antenna selection algorithm was proposed for hierarchical maritime radio networks towards better coverage and cost-effectiveness. In [179], the authors investigated the impact of diffracted waves from the structures of a ship on the received signal levels and found a relationship between the clearance angles and interference. In [180], the authors focused on the interference between the mobile satellite service and the fixed service in a maritime environment in the Ku band, and analysed the mobile earth station's transmit power, antenna gain, speed, and the propagation environment.…”