Degradation due to Quantization Noise in Radio Astronomy Phased Arrays

Details Degradation due to Quantization Noise in Radio Astronomy Phased Arrays Degradation due to Quantization Noise in Radio Astronomy Phased Arrays

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001exa....11...33k&link_type=abstract

Experimental Astronomy, v. 11, Issue 1, p. 33-56 (2001).

Astronomy and Astrophysics

Astronomy

2

Correlation, Phased-Array, Quantisation Effects, Radio Astronomy, Tied-Array, Very Large Baseline Interferomety (Vlbi)

Scientific paper

In this article, a model is developed for determining the probability distribution of the output of a digital adder in case of 2-, 3- and 4-level quantization before summation. This probability distribution is then used to determine the efficiency of a system which determines the total power of the signal at the output of the digital adder. The sum-signal is also used in a VLBI correlation mode where the sum-signal is correlated with the signal from a VLBI partner. The efficiency, expressed in so-called Degradation Factors, is determined for 1- and 2-bit correlation and 2-, 3- and 4-level quantization before summation. Furthermore, the application of the calculated values (Total Power Detector Efficiencies and Degradation Factors) is illustrated.

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