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GT ECE 6390 - LECTURE NOTES

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A Short IntroRadio AsdandALMA Ob(for EngJuaoduction totronomyththeservatoryygineers)an Pablo Caram - [email protected] - 2011School of Electrical and Computer Enginering"Radio Astronomy" afrom the stars?Ebjttt t•Every object at a temperatureelectromagnetic waves.as in radio waves b0Klidite above 0 Kelvin radiates Juan Pablo Caram - 2011School of Electrical and Computer EngineringWhat can we "see" afrequencies?Ch i l d d•Chemical compounds and rea• Colder (older and further awa•Easier to analyze!Easier to analyze!at millimeter-wave tiactionsay) sourcesJuan Pablo Caram - 2011School of Electrical and Computer EngineringHow do we observe • No CCD/CMOS sensors.Walenses.lenses.• Use very directional antennbroadband receivers.At A dit f•Antenna Arrays and interfesensor, but without a lens.•Need to accuratelymeasureNeed to accurately measure at every antenna.• Spectral analysis and imageradio sources?avelength are too large. No nas, and ultra-sensitive ultra-tLik ierometry: Like an image relative phaseand amplituderelative phaseand amplitude e synthesis.Juan Pablo Caram - 2011School of Electrical and Computer EngineringThe Atacama Large Millimeter/Suub-millimeter ArrayJuan Pablo Caram - 2011School of Electrical and Computer EngineringJuan Pablo Caram - 2011School of Electrical and Computer EngineringJuan Pablo Caram - 2011School of Electrical and Computer EngineringA Global ProjectjJuan Pablo Caram - 2011School of Electrical and Computer EngineringWhere do we build this thing?Juan Pablo Caram - 2011School of Electrical and Computer EngineringWhere do we build this thing?Juan Pablo Caram - 2011School of Electrical and Computer EngineringWhere do we build this thing?Juan Pablo Caram - 2011School of Electrical and Computer EngineringWhere do we build this thing?Juan Pablo Caram - 2011School of Electrical and Computer EngineringWhere do we build this thing?Juan Pablo Caram - 2011School of Electrical and Computer EngineringBasics of ALM&I t f& InterfMA Electronics ftferometryJuan Pablo Caram - 2011School of Electrical and Computer EngineringBasics of ALM&I t f& InterfMA Electronics ftferometryJuan Pablo Caram - 2011School of Electrical and Computer EngineringThe ArrayyJuan Pablo Caram - 2011School of Electrical and Computer EngineringJuan Pablo Caram - 2011School of Electrical and Computer EngineringJuan Pablo Caram - 2011School of Electrical and Computer EngineringJuan Pablo Caram - 2011School of Electrical and Computer EngineringHolographygpyJuan Pablo Caram - 2011School of Electrical and Computer EngineringHolographygyJuan Pablo Caram - 2011School of Electrical and Computer EngineringThe ReeceiverJuan Pablo Caram - 2011School of Electrical and Computer EngineringFront End•1stDown-conversion•1stLO Synthesis•1LO SynthesisJuan Pablo Caram - 2011School of Electrical and Computer EngineringBand CartridgeJuan Pablo Caram - 2011School of Electrical and Computer EngineringReference Sign•All reference signals combined and•All reference signals combined andthrough 1 single-mode fiber.nalsd deliveredd delivered Juan Pablo Caram - 2011School of Electrical and Computer EngineringLiLthLine-LengthhC tih CorrectionJuan Pablo Caram - 2011School of Electrical and Computer EngineringCorrelatorJuan Pablo Caram - 2011School of Electrical and Computer EngineringFinal ProFinal ProPower Spectrum Example: First InterferCore (19 January, 2008)ductsductsrometric Spectrum at the ATF, Orion Hot Juan Pablo Caram - 2011School of Electrical and Computer EngineringFinalProductsJuan Pablo Caram - 2011School of Electrical and Computer EngineringJuan Pablo Caram - 2011School of Electrical and Computer Enginering19 AntennasJuan Pablo Caram - 2011School of Electrical and Computer EngineringJuan Pablo Caram - 2011School of Electrical and Computer EngineringJuan Pablo Caram - 2011School of Electrical and Computer EngineringJuan Pablo Caram - 2011School of Electrical and Computer EngineringJuan Pablo Caram - 2011School of Electrical and Computer EngineringJuan Pablo Caram - 2011School of Electrical and Computer EngineringCredits: Some material has been taken fPlease visit for furtfrom the ALMAObservatory.org website. ther credit


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