Adjacent Satellite Interference Effects on the Outage Performance of a Dual Polarized Triple Site Diversity Scheme

Kanellopoulos, J.D.; Kritikos, T. D.; Panagopoulos, Athanasios D.

doi:10.1109/tap.2007.900173

Cited by 7 publications

(5 citation statements)

References 16 publications

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“…For any given cell, after selecting , 2 or 3, and are determined by imposing two conditions. We chose to involve integral quantities, as they are definitely more reliable and meaningful than point values if derived by radar images; specifically, the area and the mean rain rate were selected, as in [14] (3) (4) In (4), indicates the incomplete gamma function. The left side of (3) and (4) is calculated numerically from radar data, whereas the expressions on the right side are valid for synthetic cells whose profile is defined by (2).…”

Section: B Optimum Rain Cell Profilementioning

confidence: 99%

“…Manuscript A wide class of PIMTs relies on the fact that fade-producing factors, markedly rain, are unevenly distributed in space. The use of multiple receiving stations located at proper distance permits to take advantage of the spatial variability of rain, so that a separation of a few tens of kilometers strongly reduces the probability that both stations simultaneously undergo an outage (site diversity technique) [3], [4]. Analogously, in satellite communications, where wide areas are of concern (i.e., Broadcasting or Multimedia services), the irregular spatial distribution of rain makes possible and convenient to selectively distribute the limited extra power available on board the satellite towards subregions where the need of power is greater owing to adverse weather conditions [5].…”

Section: Introductionmentioning

confidence: 99%

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MultiEXCELL: A New Rain Field Model for Propagation Applications

Luini

Capsoni

2011

IEEE Trans. Antennas Propagat.

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MultiEXCELL, a new rainfall model oriented to the analysis of radio propagation impairments which was developed on the basis of a comprehensive rain field database collected by the weather radar sited in Spino d’Adda (Italy), is presented. Single rain cells are modeled by an analytical exponential profile which best represents real single-peaked rain structures. The rain cells’ probability of occurrence is analytically derived from the local rainfall statistics. The spatial features of the rain field at mid- and large-scale are investigated through their natural aggregative process. The clusters (aggregates) of cells are studied in terms of distance between individual cells, of number of cells per aggregate and of distance between aggregates. Finally, the fractional area covered by rain, which the rainfall spatial correlation strongly depends on, is derived from radar data through the comparison with the same quantity provided by global long-term numerical weather products. The MultiEXCELL procedure for the generation of spatially correlated synthetic rain fields is duly presented and the model’s accurateness is preliminary assessed against the available radar dataset. Although MultiEXCELL is mainly oriented to propagation related applications, its cellular approach may reveal useful also in hydrology, for the prediction/management of water resources, and in meteorology, for the nowcasting of the temporal evolution of rain structures

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Section: B Optimum Rain Cell Profilementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MultiEXCELL: A New Rain Field Model for Propagation Applications

Luini

Capsoni

2011

IEEE Trans. Antennas Propagat.

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“…6) and again there is interference by LOS (Loss of Satellite) phase (circled and squared). The modulation indices are typically lower (less interference) during the middle of the pass when the apparent separation of the satellites is greatest [15]- [17]. The total magnitude of interference is greater for low elevation passes, and it becomes even greater as the peak period of interference approaches (from one pass to the next).…”

Section: B Interference Recordsmentioning

confidence: 99%

Modulation index application for satellite adjacent downlink interference identification

Cakaj

2012

2012 6th European Conference on Antennas and Propagation (EUCAP)

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Adjacent downlink satellite interference usually occurs because of the presence of side lobes in addition to the desired main lobe in the radiation pattern of the satellite ground station antenna. If the angular separation between two adjacent satellites is not sufficiently large, it is quiet possible that the power radiated through the antenna's radiation pattern, whose main lobe is directed towards the intended satellite, interferes with the received signal from the adjacent satellite. This problem becomes more difficult if both satellites transmit at the same frequency. The SARSAT (Search and Rescue Satellite Aided Tracking) system is designed to provide distress alert and location data in order to assist in search and rescue operation. SARSAT uplink detects and locates distress beacons (406MHz) activated at distress location. The system calculates the location of distress event using Doppler processing techniques. Processed data is repeatedly retransmitted through SARSAT downlink to Local User Terminals (LUT) when satellites are in view and also stored in on-board memory. The downlink of all SARSAT LEO (Low Earth Orbit) satellites uses the same 1544.5 MHz frequency. In case those satellites are within the main lobe of the local user terminal antenna, transmissions from adjacent satellites act as interference to each other. This can result in missed bursts or no solutions received at LUT, consequently no data provided about the distress location * . Modulation index application for adjacent satellite downlink interference identification, for periods where the interference duration may be significant, is presented in this paper. Measurement results recorded at SARSAT terminals are provided.

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“…The downlink of all SARSAT LEO satellites uses the same 1544.5 MHz frequency. If the transmitted EIRP from each satellite is similar, for two satellites close to each other, the two signals will act as interference to each other, severely degrading the received signal [16].…”

Section: Downlink Interferencementioning

confidence: 99%

The Downlink Adjacent Interference for Low Earth Orbiting (LEO) Search and Rescue Satellites

Cakaj¹,

Fitzmaurice²,

Reich³

et al. 2010

IJCNS

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NOAA (National Oceanic and Atmospheric Administration) -LEO environmental satellites provide continuous coverage of Earth, supplying high-resolution global meteorological, oceanic and space observation data. In addition, these satellites are part of the international COSPAS -SARSAT program, which aides search and rescue teams worldwide. The USA segment, referred to as SARSAT (Search and Rescue Satellite Aided Tracking) system, is designed to provide distress alert and location data to assist on search and rescue operations. SARSAT locates distress beacons (406MHz) activated at distress locations. The system calculates a location of the distress event using Doppler processing techniques. Processed data is continuously retransmitted through the SARSAT downlink to Local User Terminals (LUT) when satellites are in view. The downlink adjacent interference is expected when two satellites operate in close proximity and share the same frequency. The downlinks of all SARSAT LEO satellites use the same 1544.5 MHz frequency. In cases where the satellites are within the main lobe of the local user terminal antenna, transmissions from adjacent satellites act as interference to one-another, effectively decreasing the signal-to-noise ratio of the desired downlink. This can result in missed distress beacon bursts or no stored solutions received at the LUT, consequently no data is provided about a distress location. Analysis on interference prediction, impacts on system operation and recommendations for mitigating interference periods where the duration may be significant, are presented in this paper.

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Adjacent Satellite Interference Effects on the Outage Performance of a Dual Polarized Triple Site Diversity Scheme

Cited by 7 publications

References 16 publications

MultiEXCELL: A New Rain Field Model for Propagation Applications

MultiEXCELL: A New Rain Field Model for Propagation Applications

Modulation index application for satellite adjacent downlink interference identification

The Downlink Adjacent Interference for Low Earth Orbiting (LEO) Search and Rescue Satellites

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