Array gain

<h2 id="applications">Applications</h2>
<p>In <a href="/facts/Radio_astronomy/TdjF4LgL">radio astronomy</a> it is difficult to achieve a good signal-to-noise ratio because of background noise from modern communications. Even for strong astronomical radio emission it is typical for SNR levels to be below 0 <a href="/facts/Decibel/0LyxAPXh">decibels</a>. To counter this problem exposure of the antenna to the source over large periods of time are needed just as in visible sky viewing. Array gain is achieved using multiple, even dozens of radio receivers to collect as much signal as possible. 
</p><p>Robots equipped with antenna arrays have better communication using array gain to eradicate dead spots and reduce interferences.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a>
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<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Diversity_gain/ga5PFjW9">Diversity gain</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Van Trees, H.L.; , Optimum Array Processing, John Wiley and Sons, Inc., New York, 2002. <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>IEEE Std 145-2013, IEEE Standard for Definitions of Terms for Antennas. <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>Hambling, David. "Robots fall into line with the help of sparse array antenna." New Scientist 207 (2010): 22. OmniFile Full Text Mega. Web. 24 Apr. 2011. <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
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Array gain open-in-new

Array gain