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.






                                                                                                G. Bianchi