T his paper presents an accurate analysis of an innovative high altitude platform with an unconventional ellip-soidal shape during the most critical operation. The airship is designed accordingly to the specifications, which have been... more
T his paper presents an accurate analysis of an innovative high altitude platform with an unconventional ellip-soidal shape during the most critical operation. The airship is designed accordingly to the specifications, which have been analyzed in terms of the required CONOPS (Concepts of Operations) which are associated with the proposed High Altitude Pseudo-Satellite (HAPS) technology and special operations and to analyze the operational scenarios. An innovative cruiser feeder system is defined and studied. The CONOPS includes communications relays, support of intelligence, surveillance, target acquisition monitor "mobile targets", and reconnaissance, including long-range ISTAR missions performed by the feeder, combining satellite vision and HAPS vision for a forest fire, disasters, naval accidents, maritime and ground borders. The paper realizes a multidisciplinary analysis that allows creating the design of the HAPS, referring to both cruiser and feeder in different operative scenarios. It is expected to produce the preliminary basis for a future digital twin based design to generate the best possible configuration by mean of implementing multiphysics simulations. Structured object-oriented design processes involve developing several different system models and configurations. The modular design of the core modules is necessary for both ensuring the adequate performances , the capability of satisfying the operative necessities which have been defined by the CONOPS and fulfilling the requirements.
This paper presents a simple model for the evaluation of obstruction caused by multiple buildings in satellite mobile communication systems, or in high-altitude platform (HAP) coverage. The proposed model can be useful for integration... more
This paper presents a simple model for the evaluation of obstruction caused by multiple buildings in satellite mobile communication systems, or in high-altitude platform (HAP) coverage. The proposed model can be useful for integration into propagation prediction tools. It is based on the KichhoffHuygens formulation, and includes the effect of ground reflections and reflections on a facing building. The performance of this model is evaluated by comparing it with available results from a more complex model based on the UTD.
In this paper, performance of providing WiMAX from high altitude platforms (HAPs) with multiple antenna payload will be investigated as well as considering the coexistence capability with multiple-operator terrestrial deployments. A... more
In this paper, performance of providing WiMAX from high altitude platforms (HAPs) with multiple antenna payload will be investigated as well as considering the coexistence capability with multiple-operator terrestrial deployments. A scenario of a HAP and terrestrial WiMAX base stations deployed inside a HAP coverage area with a radius at 30 km will be proposed. HAP cellular formation with different
This paper discusses the use of high altitude platforms, HAPs, to provide mobile communication services to on-ground customers. The paper explains the behavior of UMTS radio network in a situation, where the service is being provided by... more
This paper discusses the use of high altitude platforms, HAPs, to provide mobile communication services to on-ground customers. The paper explains the behavior of UMTS radio network in a situation, where the service is being provided by HAP and terrestrial base stations in a disaster scenario. In the disaster scenario, a set of adjacent terrestrial cellular base stations in the middle of the network have been disabled. A HAP station has been launched to the disaster location to provide UMTS service. The possible effects between the HAP and the terrestrial UMTS network are assessed from the system point of view by analyzing the simulation results of the radio interface. The results show that the HAP is able to improve the performance in the radio network by providing UMTS coverage from the HAP station. The HAP station is able to restore the disaster area throughput to the level of 70 % from the original level. However, to achieve good network performance using HAP, careful configurat...
The PEGASUS (Policy support for European Governments by Acquisition of information from Satellite and UAV borne Sensors) project's aim is to provide an economic way to gather high resolution data (visual, IR and thermal imagery, laser... more
The PEGASUS (Policy support for European Governments by Acquisition of information from Satellite and UAV borne Sensors) project's aim is to provide an economic way to gather high resolution data (visual, IR and thermal imagery, laser altimetry, SAR, atmospheric measurements) from a high altitude platform. Because the platform will not be manned, it will be able to operate continuously for
High Altitude platform station (HAPS) technology is a new technology that can perform the tasks currently handled using terrestrial and satellite systems. Anew broadband telecommunication systems has been recently proposed for provision... more
High Altitude platform station (HAPS) technology is a new technology that can perform the tasks currently handled using terrestrial and satellite systems. Anew broadband telecommunication systems has been recently proposed for provision of fixed, mobile and personal services adopting the use of high altitude platform station placed in a fixed position in the stratospheric layer at heights from 17-25 km. This paper examines the interference between HAPS and FWA (fixed wireless access). Hence the characteristic of the interference from single HAPS toward FWA based station established appropriate separation distance and off axis angle of FWA to avoid harmful interferences. The effect of interference on FWA depend on the parameter as elevation angle of the HAPS, elevation angle HAPS ground station as well as that the azimuth angles of the FWA station .Calculations are done by using MATLAB software following the ITU recommendation. Result shows interference reduces when separation distan...
This paper offers a short review of High Altitude Platform Stations (HAPS) technology that promises a low-cost and quick access to modern telecommunication services. Such a perspective has been appealing to all users in areas where the... more
This paper offers a short review of High Altitude Platform Stations (HAPS) technology that promises a low-cost and quick access to modern telecommunication services. Such a perspective has been appealing to all users in areas where the modern telecommunication infrastructure is lacking. With all its promises fulfilled, the HAPS technology will contribute significantly to bridging the digital gap and to improving the emergency and security communications. It will also offer an attractive alternative to the present solutions to the last-mile-problem .
The merging of Orthogonal Frequency Division Multiplexing (OFDM) with Multiple-input multiple-output (MIMO) is a promising mobile air interface solution for next generation wireless local area networks (WLANs) and 4G mobile cellular... more
The merging of Orthogonal Frequency Division Multiplexing (OFDM) with Multiple-input multiple-output (MIMO) is a promising mobile air interface solution for next generation wireless local area networks (WLANs) and 4G mobile cellular wireless systems. This paper details the design of a highly robust and efficient OFDM-MIMO system to support permanent accessibility and higher data rates to users moving at high speeds,
This paper addresses network architectures in a constellation of high altitude platforms (HAPs) with overlapping coverage areas, focusing on the additional network elements/functionalities required to make use of load balancing... more
This paper addresses network architectures in a constellation of high altitude platforms (HAPs) with overlapping coverage areas, focusing on the additional network elements/functionalities required to make use of load balancing mechanisms. According to the location within the network and the complexity of additional equipment/functionality the paper proposes two different architectures. In the case of the basic utilisation of multiple HAPs a new equipment/functionality is installed only at the user premises, supporting load balancing only for the connections initialised from the HAP user network to the Internet (i.e. the outbound connections). In the case of advanced utilisation of multiple HAPs a new equipment/functionality is needed both at the user premises and in the HAP network, thus supporting load balancing in both directions. For the performance evaluation of load balancing mechanisms we built a simulation model supporting typical applications such as e-mail, file transfer, ...
An FDD-UTRA coverage planning is performed using a HAPS. Initially, the cell geometry is discussed. Then, the interference for both links for different isoflux footprints is calculated. The calculations are repeated in a radial direction.... more
An FDD-UTRA coverage planning is performed using a HAPS. Initially, the cell geometry is discussed. Then, the interference for both links for different isoflux footprints is calculated. The calculations are repeated in a radial direction. Finally, the capacity for each service is evaluated.
The merging of Orthogonal Frequency Division Multiplexing (OFDM) with Multiple-input multiple-output (MIMO) is a promising mobile air interface solution for next generation wireless local area networks (WLANs) and 4G mobile cellular... more
The merging of Orthogonal Frequency Division Multiplexing (OFDM) with Multiple-input multiple-output (MIMO) is a promising mobile air interface solution for next generation wireless local area networks (WLANs) and 4G mobile cellular wireless systems. This paper details the design of a highly robust and efficient OFDM-MIMO system to support permanent accessibility and higher data rates to users moving at high speeds,
Cellular communications using high altitude platforms will predominate the existing conventional terrestrial or satellite cellular systems but requires some optimization especially in the, radio coverage cellular design. In this paper... more
Cellular communications using high altitude platforms will predominate the existing conventional terrestrial or satellite cellular systems but requires some optimization especially in the, radio coverage cellular design. In this paper either spot-beam antennas or antenna phased arrays are used in the radio coverage which is optimized in directing their beams to satisfy mostly uniform cellular layout with minimal coverage problems such as coverage gaps between cells or excessive cells overlap
This paper addresses network architectures in a constellation of high altitude platforms (HAPs) with overlapping coverage areas, focusing on the additional network elements/functionalities required to make use of load balancing... more
This paper addresses network architectures in a constellation of high altitude platforms (HAPs) with overlapping coverage areas, focusing on the additional network elements/functionalities required to make use of load balancing mechanisms. According to the location within the network and the complexity of additional equipment/ functionality the paper proposes two different architectures. In the case of the basic utilisation of multiple HAPs a new equipment/functionality is installed only at the user premises, supporting load balancing only for the connections initialised from the HAP user network to the Internet (i.e. the outbound connections). In the case of advanced utilisation of multiple HAPs a new equipment/functionality is needed both at the user premises and in the HAP network, thus supporting load balancing in both directions. For the performance evaluation of load balancing mechanisms we built a simulation model supporting typical applications such as e-mail, file transfer,...
... networks and achieve wide adop-tion among potential users, the HAP network has to ... and its recent extensions and variations (ie, IEEE 802.16a and IEEE 802.16e, still under ... trains, in partic-ular robustness to multipath signal... more
... networks and achieve wide adop-tion among potential users, the HAP network has to ... and its recent extensions and variations (ie, IEEE 802.16a and IEEE 802.16e, still under ... trains, in partic-ular robustness to multipath signal propagation and support for mobility management. ...
