Radiotelescopi di Medicina : LOFAR

HOME LOFAR 3.1 The System

 

3.1 The System

1. Introduction

The receivers convert directly a 100 MHz bandwidth to the base band. Each receiver is connected to both a low band antenna and an high band antenna; only one of these can be selected at a time. The 100 MHz signal will be buffered for ~1 sec for Cosmic Ray detection and Transient Processing.

The maximum total bandwidth to be processed will be 32 MHz. Each remote station delivers a single dual polarization beam at 32 MHz, or 8 dual polarization beams at 4 MHz or any combination in between. The resulting output data rate is ~2.5 Gbit/s on the whole. The stations will be located following an exponential distribution in exponential shells with an increment factor of 1.6, up to a maximum baseline of roughly 100 Km. The shells start at 1.2 Km and are elliptical in shape, extending in the North-South direction with an 1.3 axial ratio.

 

In brief, for radio astronomical applications the following main observing modes will be supported:

2. The Core
3.Technical Details
3.1 The System
3.2 Data processing
3.3 Antennas spec.
4.Lofar at Medicina
4.1 Baseline extension
4.2 Lofar Kit
4.3 Superstation
5. Science

 

¨      Synthesis imaging.

¨      Transient detection (probably using correlation of large numbers of narrow-bandwidth beams).

¨      Tied antenna array adaptive beamforming.

¨     Antenna-based buffering of 1 sec at full-digitised bandwidth and limited detection/triggering (in particular for UHECR events) at station level.

 

   
 

 

 

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