Multi-Level Pre-Correlation RFI Flagging for Real-Time Implementation on UniBoard

Because of the denser active use of the spectrum, and because of radio telescopes higher sensitivity, radio frequency interference (RFI) mitigation has become a sensitive topic for current and future radio telescope designs. Even if quite sophisticated approaches have been proposed in the recent years, the majority of RFI mitigation operational procedures are based on post-correlation corrupted data flagging. Moreover, given the huge amount of data delivered by current and next generation radio telescopes, all these RFI detection procedures have to be at least automatic and, if possible, real-time. In this paper, the implementation of a real-time pre-correlation RFI detection and flagging procedure into generic high-performance computing platforms based on Field Programmable Gate Arrays (FPGA) is described, simulated and tested. One of these boards, UniBoard, developed under a Joint Research Activity in the RadioNet FP7 European programme is based on eight FPGAs interconnected by a high speed transceiver mesh. It provides up to ~4 TMACs with Altera Stratix IV FPGA and 160 Gbps data rate for the input data stream. Considering the high in-out data rate in the pre-correlation stages, only real-time and go-through detectors (i.e. no iterative processing) can be implemented. In this paper, a real-time and adaptive detection scheme is described. An ongoing case study has been set up with the Electronic Multi-Beam Radio Astronomy Concept (EMBRACE) radio telescope facility at Nan\c{c}ay Observatory. The objective is to evaluate the performances of this concept in term of hardware complexity, detection efficiency and additional RFI metadata rate cost. The UniBoard implementation scheme is described.Comment: 16 pages, 13 figure

Lieux, images, événements dans l'écriture poétique: Jacint Verdaguer

This contribution begins with a reflection on L’Atlàntida. It so happens that this work enables us to understand what, it has been proposed in recent years, should be called the “syntax of imagination”, that is to say, the process by which the creator of a poem reinforces the impact of his discourse by setting up in the background a sort of supraverbal continuum. This unreal element can be the very basis of the isotopy of the discourse: the author of the article called it “the persistent murmur of a lost world”. For Canigó, the place occupied by the Occitan region was evoked – Provence in particular, but also Mare Nostrum – while L’Atlàntida gave readers the opportunity to recall the pan-Iberian and Mediterranean projection of the poet’s purpose: the two works, each in their own way, open the door to the universal

El pensamiento de Milton Friedman en el marco de la escuela de Chicago

El pensamiento de Milton Friedman en el marco de la escuela de Chicag