MATRIX MATRIX RADIOMETRICRADIOMETRIC SYSTEM FOR RATANSYSTEM FOR RATAN-600 -600

«МА«МАRSRS-3»-3»

Conclusion of installation Conclusion of installation

AA..BB..BBееrlinrlin , , NN..AA..NizhelskyNizhelsky, , М.М.GG. . MingalievMingaliev, , PP..GG..TsiboulevTsiboulev, , DD..VV..KratovKratov, ,

VV..VV..SmirnovSmirnov, , OO.М..М.PylypenkoPylypenko

The system is developed for instrumentation The system is developed for instrumentation supply of the supply of the Cosmological GeneCosmological Gene project project

((Scientific leader academician Yu.N.ParijskijScientific leader academician Yu.N.Parijskij

Project Fases «МАRS-1» - «МАRS-2»- «МАRS-3»

• «МАRS-1» (2001) - 1 radiometric module, that was developt and investigated in «Total power», «Noise added

radiometer» (NAR) and modulation (МОD) modes

• «МАRS-2» (2003) – more than 3 years round-the-clock operated 3-channel system (МОD mode) with basic parameters:

Central frequency 30 GHz Bandwidth 4 GHz Тsys = 220 К (Sensitivity 6 mК/s1/2 for each channel)

• «МАРС-3»(2006) - 16-channel system (МОD) with 5 GHz bandwidth, calculated Т sys = 200 - 210К, 5 mК/s1/2

The base of matrix systemsThe base of matrix systems

«МА«МАRSRS-1» - «МА-1» - «МАRSRS-2» – «МА-2» – «МАRSRS-3»-3»is the radiometric module, is the radiometric module, wichwich inclusiveinclusive all all

componemt parts of classic radiometer: front-end LNA, componemt parts of classic radiometer: front-end LNA, output amplifiers, bandpass filter, detector, low frequency output amplifiers, bandpass filter, detector, low frequency

amplifieramplifier

• «МАRS-2» radiometric module with broad band fast-operating ferrite modulator

Structure chart of Structure chart of 3- 3-channel matrix channel matrix radiometric systemradiometric system «МА «МАRSRS-2»-2»

HF part of 3-channel matrix systemHF part of 3-channel matrix system «МА «МАRSRS-2»,-2»,is more than 3 Years in operating at RATAN-600 is more than 3 Years in operating at RATAN-600

radio telescoperadio telescope

InIn 2004 2004 the front-end partthe front-end part of theof the «МА «МАRSRS--22» » system was system was reconstructed reconstructed ( (was add the possibility of axial rotation of linear was add the possibility of axial rotation of linear

polarization analyser to polarization analyser to +-45 +-45о)о)

The focal line of RATAN-600 Feed Cabin The focal line of RATAN-600 Feed Cabin Nr.1with primary feeds.Nr.1with primary feeds.

Qn the leftQn the left 3-channel matrix system 3-channel matrix system «МА «МАRSRS-2»-2» is placed is placed, , on the righton the right is 3-frequency feed with superposed phase centers at decimeter is 3-frequency feed with superposed phase centers at decimeter

wavelengths wavelengths 13-13-3131-49 с-49 сmm

Observation of radiation bands of JupiterObservation of radiation bands of Jupiter withwith high high resolution at RATAN-600 using resolution at RATAN-600 using «МА«МАRSRSС-2»С-2»

systemsystem

A new element base of the A new element base of the «МА«МАRSRS-3»-3»receiving modulereceiving module

1. 1. Instead of hybrid front-end LNA Instead of hybrid front-end LNA (3 (3 stage of stage of PHEMT)PHEMT) the finished monolithic IC the finished monolithic IC ( (ff. . Fujitsu)Fujitsu) withwith

noise noise (160-170 К) (160-170 К) less as hybrid circuit is used.less as hybrid circuit is used.

2. 2. In a back-end amplifiers are monolithic In a back-end amplifiers are monolithic ""unconditionally stableunconditionally stable"" IC with unipolar power supply IC with unipolar power supply,, lower noise and lower noise and greatlygreatly depressed heat generation depressed heat generation

as comparison to as comparison to «МА«МАRSRS-2» -2» are applicated.are applicated.

«МА«МАRSRS-3» -3» radiometric module radiometric module with broad-band with broad-band (5 (5 GHzGHz) ) ferrite modulatorferrite modulator (on left) and noise (on left) and noise

generator modulegenerator module

«МА«МАRSRS-3»-3»HF HF unitunit draftdraft

• Front-end waveguide part: • Primary feeds (32)• Tranfers from round to

rectangular section with +-45о rotation (32)

• Straight waveguides or +-45о twists (32)

• Curved waveguides with directional couplers for calibration

• Modulators (switches) (16 )

Radiometric modules (16) with a new element base

HF part of HF part of «МА«МАRSRS-3»-3»Front-end waveguides,Front-end waveguides, switches and receiving modulesswitches and receiving modules are on the unified temperature-stabilized aluminum plate are on the unified temperature-stabilized aluminum plate

encased.encased.

Underside of the assembly plates the power Underside of the assembly plates the power supply lines andsupply lines and thermostats are installed.thermostats are installed.

By development of the By development of the «МА «МАRSRS-3»-3» system system we pay we pay attentionattention to search of fabrication method for many to search of fabrication method for many

waveguide elements waveguide elements ( (primary feeds, twists, primary feeds, twists, curved waveguides, directional couplers etc.curved waveguides, directional couplers etc.) )

The first manufactured elements of the 16-channel The first manufactured elements of the 16-channel (32 feeds) (32 feeds) «МА«МАRSRS-3»-3» system are primary feeds system are primary feeds

and and waveguide adapters from circular to waveguide adapters from circular to rectangular sectionrectangular section

Waveguide partsWaveguide parts of of «МА«МАRSRS-3»-3» system system: : Twists toTwists to +-45+-45оо andand bends inbends in Е Е andand Н- Н-flatnessflatness

Removable references for observationRemovable references for observation of of distant radidistant radioo source sourcess and background and background

radiationsradiations

Choice of technology and development of Choice of technology and development of adjustadjusting devices for ing devices for manufacture of waveguide parts manufacture of waveguide parts : : hogging hogging (а) (а) andand twisttwist ( (bb), ),

precise soldering of flanges precise soldering of flanges ((cc andand dd))

For feeding of active components theFor feeding of active components the high-stable power supplies from Ekaterinburg high-stable power supplies from Ekaterinburg

((12 12 unitsunits)) are used are usedwww.mikroakustika.ruwww.mikroakustika.ru

SummarySummary

• 1. Use of know-how and microwave miniaturization show the profitability of designing of the matrix systems in focal plane of the RATAN-600 radio telescope, which allowed the extension of number of elements N up to 100 and more.

• 2.It is possible in meridian receive mode in square root of N to increase the sensitivity of RATAN-600 radio telescope and in N time to reduce the number of days required for data storage from weak sources.