projekt, mille eesmärk on tuvastada 21 cm vesinikujoone spekter galaktikatevahelisest keskkonnast punanihete vahemikus 15 kuni 30 ajal, mil Universum oli vaid umbes 1 % oma praegusest vanusest
project that designed to detect the spectrum of the 21 cm hydrogen line from the intergalactic medium (IGM) at redshifts of 15–30, when the Universe was just ~1 % of its present age
Suureava katse pimedate ajastute tuvastamiseks (LEDA) asub USA-s Long Wavelength Array (LWA) objektil, Very Large Array (VLA) vahetus läheduses ja koosneb peamiselt suure sisendite arvuga korrelaatorist, st 512 sisendit umbes 60 MHz ribalaiusel, kalibreerimis- ja kujutise moodustamise süsteemist ning aparatuurist kalibreeritud koguvõimsuse mõõtmiseks. LEDA rakendab antennimassiivil põhinevat kalibreerimist, et suurendada täpsust, millega koguvõimsuse signaalist eraldatakse esiplaanisignaalid. Projekt sai 2011. a rahastuse Riiklikult Teadusfondilt (National Science Foundation).
The large-aperture experiment to detect the dark ages (LEDA) is located in the US at the Long Wavelength Array site, adjacent to the Very Large Array. LEDA principally comprises a "large-N" array correlator (512 inputs over ~ 60 MHz), calibration & imaging system, and instrumentation for measurement of calibrated total-power. LEDA will feature array-based calibration to improve the accuracy of foreground subtraction from the total-power signal. The project received funding from the National Science Foundation in August 2011.
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