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Rome, February 14, 2013

Status of the Project Report on the first year activities. With the support of the Prevention, Preparedness and Consequence Management of Terrorism and other Security-related Risks Programme European Commission - Directorate-General Home Affairs. Rome, February 14, 2013.

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Rome, February 14, 2013

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  1. Status of the Project Report on the first year activities With the support of the Prevention, Preparedness and Consequence Management of Terrorism and other Security-related Risks Programme European Commission - Directorate-General Home Affairs Rome, February 14, 2013

  2. Characterization of the HF channel • IonosphericChannelProperties • Long-haulcommunications in HF band • Maincriticalaspect Ionosphericchannelbehaviourisspatial-timedependent Effects Doppler Spread Doppler Shift Delay Spread Ionospheric Channel estimation is needed

  3. ReceivedSignal • Weighted (giT(t)) sum ofcopiesof the transmittedsignal. • Each copy ischaracterizedwith a differentdelay(Ƭi). • IonosphericChannelModel • Ray-tracingalgorithmwithWatterson’s model • Doppler Spread and Doppler ShiftEvaluation The tapgainfunctionismodeledas a Gaussianprocessaccoridngto the ITU–R F.1487 Doppler Spread Isprovidedby the σ oftapgainspectrum

  4. Delay Spread Evaluation The presenceofmultipathproduces a signaldispersion in the time domain TimeDispersion or Delay Spread Differencebetween the maximum and minimum propagationdelayassociatedto the multipathcomponents. Ray Tracing Algorithm • Assumptions • Group pathis a indipendentvariable. • 3D stratifiedionosphere.

  5. Results 1° Scenario: Rome-Pireo Link Input Parameters Simulation Steps: Evaluationof the Frequency and elevation angle pairrefersto the MUF90% (the SIRM modelhasbeenused).

  6. Results 1° Scenario: Rome-Pireo Link Computationof the minimum (βmin) and the maximum (βmax) elevation angle @MUF90% Applicationof the ray-tracingalgorithmtoelevationvaluesobtainedby the samplingof the antenna aperture (samplingstepsizeis 0.05°). Extractionof the elevationangles (Δβ) relatedto the allpathsthatfallinto 100m around the receiver. Applicationof the ray-tracingalgorithmtoelevationintervalΔβ. A samplingstepsizeof 0.0001° hasbeenassumed.

  7. Results 1° Scenario: Rome-Pireo Link Zoom of the figure Electron density profile and ray-paths (Pireo site)

  8. 2° Scenario: Rome-Barcelona Link Input Parameters TransmittedSignalParameters Zoom of the figure Electron density profile and ray-paths

  9. 3° Scenario: Rome-Cefalù Link Input Parameters TransmittedSignalParameters Zoom of the figure Electron density profile and ray-paths

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