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| title = A Scalable Correlator Architecture Based on Modular FPGA Hardware, Reuseable Gateware, and Data Packetization
| doi = 10.1086/593053
|arxiv = 0809.2266 |bibcode=2008PASP..120.1207P}}</ref>
Correlation spectrometers like the [[Michelson interferometer]] vary the time lag between signals obtain the power spectrum of input signals. The power spectrum <math>S_{\text{XX}}(f)</math> of a signal is related to the its autocorrelation function by a Fourier transform:<ref name="Harris">[http://www.sofia.usra.edu/det_workshop/papers/session4/4-04harris_edjw021022.pdf ''Spectrometers for Heterodyne Detection''] {{webarchive |url=https://web.archive.org/web/20160307051932/http://www.sofia.usra.edu/det_workshop/papers/session4/4-04harris_edjw021022.pdf |date=March 7, 2016 }} Andrew Harris</ref>
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| issue = 12
| pages = 64–67
| doi = 10.1109/97.991140|bibcode=2002ISPL....9...64R}}</ref>
=== Spatial whitening ===
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| pages = 355–373
| doi = 10.1086/317360
|arxiv = astro-ph/0005359|bibcode=2000ApJS..131..355L}}</ref>
== Summary ==
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