Data streams from the low frequency instrument on-board the PLANCK satellite: Statistical analysis and compression efficiency

被引:6
作者
Maris, M
Maino, D
Burigana, C
Pasian, F
机构
[1] Osservatorio Astron Trieste, I-34131 Trieste, Italy
[2] CNR, Ist Tesre, I-40129 Bologna, Italy
来源
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES | 2000年 / 147卷 / 01期
关键词
methods : data analysis; methods : statistical; instrumentation : miscellaneous; space vehicles; cosmology : cosmic microwave background;
D O I
10.1051/aas:2000289
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The expected data rate produced by the Low Frequency Instrument (LFI) planned to fly on the ESA PLANCK mission in 2007, is over a factor 8 larger than the bandwidth allowed by the spacecraft transmission system to download the LFI data. We discuss the application of lossless compression to PLANCK-LFI data streams in order to reduce the overall data flow. We perform both theoretical analysis and experimental tests using realistically simulated data streams in order to fix the statistical properties of the signal and the maximal compression rate allowed by several lossless compression algorithms. We studied the influence of signal composition and of acquisition parameters on the compression rate C-r and develop a semiempirical formalism to account for it. The best performing compressor tested up to now is the arithmetic compression of order 1, designed for optimizing the compression of white noise like signals, which allows an overall compression rate (C-r) over bar = 2.65 +/-0.02. We find that such result is not improved by other lossless compressors, being the signal almost white noise dominated. Lossless compression algorithms alone will not solve the bandwidth problem but needs to be combined with other techniques.
引用
收藏
页码:51 / 74
页数:24
相关论文
共 48 条
[11]   INTERPRETATION OF DEEP COUNTS OF RADIO-SOURCES [J].
DANESE, L ;
DEZOTTI, G ;
FRANCESCHINI, A ;
TOFFOLATTI, L .
ASTROPHYSICAL JOURNAL, 1987, 318 (01) :L15-L20
[12]   A flat Universe from high-resolution maps of the cosmic microwave background radiation [J].
de Bernardis, P ;
Ade, PAR ;
Bock, JJ ;
Bond, JR ;
Borrill, J ;
Boscaleri, A ;
Coble, K ;
Crill, BP ;
De Gasperis, G ;
Farese, PC ;
Ferreira, PG ;
Ganga, K ;
Giacometti, M ;
Hivon, E ;
Hristov, VV ;
Iacoangeli, A ;
Jaffe, AH ;
Lange, AE ;
Martinis, L ;
Masi, S ;
Mason, PV ;
Mauskopf, PD ;
Melchiorri, A ;
Miglio, L ;
Montroy, T ;
Netterfield, CB ;
Pascale, E ;
Piacentini, F ;
Pogosyan, D ;
Prunet, S ;
Rao, S ;
Romeo, G ;
Ruhl, JE ;
Scaramuzzi, F ;
Sforna, D ;
Vittorio, N .
NATURE, 2000, 404 (6781) :955-959
[13]  
DEBERNARDIS P, 1998, P 33 RENC MOR FUND P, P209
[14]  
DEZOTTI G, 1998, IN PRESS APJ LETT
[15]  
Ferreira PG, 1999, AIP CONF PROC, V476, P293
[16]   The cosmic microwave background spectrum from the full COBE FIRAS data set [J].
Fixsen, DJ ;
Cheng, ES ;
Gales, JM ;
Mather, JC ;
Shafer, RA ;
Wright, EL .
ASTROPHYSICAL JOURNAL, 1996, 473 (02) :576-587
[17]   LUMINOSITY EVOLUTION AND DUST EFFECTS IN DISTANT GALAXIES - IMPLICATIONS FOR THE OBSERVABILITY OF THE EARLY EVOLUTIONARY PHASES [J].
FRANCESCHINI, A ;
MAZZEI, P ;
DEZOTTI, G ;
DANESE, L .
ASTROPHYSICAL JOURNAL, 1994, 427 (01) :140-154
[18]  
GAZTNAGA E, 2000, AP LETT COMM, P37
[19]  
GUZZI P, 1999, CODING SCHEME LFI DA
[20]  
HANANY S, 2000, UNPUB APJ LETT