Arcetri Astrophysical Observatory

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logosmallarcetri Arcetri Technical Report 6/2017


SKA Project Series
LFAA tile beamformer functional model

S. Chiarucci, G. Comoretto

INAF Osservatorio Astrofisico di Arcetri

Abstract

A complex digital signal processing system like the LFAA tile beamformer requires extensive simulations to test its compliance with the system specifications.

A Matlab simulator, composed of a general purpose signal generator, a simulation pipeline for the actual processing, and a set of analysis tools to extract the significant parameters from the processed data has been designed and tested.

The simulator has been used to test various parameters, as added digital noise, calibration capabilities, spectral response, channel to channel insulation and beamforming losses.

Pdf version of this report

 

logosmallarcetri Arcetri Technical Report 5/2017


SKA Project Series
SKA-LOW transient buffer proposal

G. Comoretto

INAF Osservatorio Astrofisico di Arcetri

Abstract

The SKA-LOW telescope must include a transient buffer.

The buffer must be able to capture up to 600 seconds of station data, from all the 512 LFAA stations, for a 150 MHz total bandwidth. Different proposals for the buffer implementation are compared.

Pdf version of this report

 

logosmallarcetri Arcetri Technical Report 3/2017


SKA Project Series
SKA-PSS - Candidate Folding and Optimisation Processing - FLDO

C.Baffa, E.Giani and P. Thiagaraj

INAF Osservatorio Astrofisico di Arcetri

UMAN Manchester University

Abstract

The SKA Pulsar Search requires a fast real time data processing in order to keep-up to the SKA pulsar data production. Such pipeline (named CSP-NIP-PSS pipeline) will be implemented as a collection of software modules running on PSS nodes or on the softwaree accelerators (GPU or FPGA) attached to them.

The FLDO is a software module within the CSP-NIP-PSS pipeline. The FLDO receives the SCL and FFB and produces the optimized candidates and their associated data. This component is responsible for producing the periodicity search data products that form the output of the CSP-NIP-PSS sub-element.

The present document presents two possible implementations on GPU and on FPGA accelerators.

The Pdf version of this report will be publicy available after Spring 18 CDR

 

 

logosmallarcetri Arcetri Technical Report 4/2017


SKA Project Series
LFAA tile beamformer signal processing

G. Comoretto, C.Belli

INAF Osservatorio Astrofisico di Arcetri

Abstract

The LFAA digital signal processing chain is described. The processing starts with the ADC sampling, and includes channelization, calibration, beamforming and all rescaling and requantization stages present in the processing chain. Expected signal level and numeric coefficients embedded in the processing are detailed. The description is purely functional, i.e. it does not include implementation details that do not affect the signal. Time tagging and auxiliary data (total power, diagnostic spectra) produced by the processing chain are also described.

Pdf version of this report

 

logosmallarcetri Arcetri Technical Report 2/2017


SKA Project Series
SKA-PSS - Network Setup for PSS Prototype

C.Baffa

INAF Osservatorio Astrofisico di Arcetri

Abstract

The installation of PSS hardware requires the deployment of new versions of the software system (OS and custom code) to a large number of nodes: MID count will be 500, and LOW 166. The manual approach to install one machine a time is of course vastly inefficient, as all nodes will share the same system, and we could have differences only in few configuration files. The PSS team chose a structured approach, with some possible alternatives. In next sections we will present the network setup of PSS Prototype, in order to gain the experience needed for the deployment of the final PSS engine.

The Pdf version of this report will be publicy available after Spring 18 CDR