Glen Langston: VSOP-2 at JPL 061 NRAO-GB Support for VSOP-2  Glen Langston National Radio Astronomy Observatory Green Bank, WV USA NRAO Goals  Support

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<ul><li><p>NRAO-GB Support for VSOP-2Glen LangstonNational Radio Astronomy ObservatoryGreen Bank, WV USA</p><p>NRAO GoalsSupport Space VLBI ScienceDevelop Systems for integration into future Ground Science systems</p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>Bi-Static Radar</p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>Technology Development: Chalmers Feed180180Low Band (150 to 1700 MHz) Feed1 meter x 1 meter square.DewarLow BandverticalLow BandHorizonSignalInjectFeed Advantages:Wide Bandwidth 150 to 1700 MHzFocus position independent of Wavelength60 degree FWHM illumination patternProfessor Per-Simon Kildal </p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>Data Acquisition SystemVMETRO5210-JFF5210-JFFConduantTK-200TK-200A/DRXA/DRXA/DRXA/DRX140 MHz IF75 MHz BW70 dB SFDR186 MS/s12 bits3.2 TB/chRemovableStoragePolyphaseChannelization52 sb75 MHz135-270 MB/s (w/compression)NRAOAntennaRe-OrderData(non-realtime)3.6 TB/chFixedStorage(JBOD)VMESBCControlComputerRXComputerTK-200TK-2005210-JFF5210-JFFMIT/LLFPDPVMETROEL-SB2GFPDP IIFibreChannelFibreChannelFirewallNRAOLANGPS/IRIGDiskController(400 MB/s/ch max)</p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>ISIS six element Passive radarInstalled ISIS six element discone antenna array for passive VHF signal capture at NRAO Green Bank, with the 43 meter antenna and the Lincoln Labs trailer seen in the background. The MIDASMobile #001 node is installed in the left hand side of the trailer. Low loss heliax cable is attached to each VHF discone antenna (right image) and secured to the mounting poles, while nylon cord provides guying support and structural stability.</p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>Passive (FM radio) Radar Observation of scattering of 107.3 MHz FM intercepted at MIT Haystack Observatory and detected at NRAO Green Bank using the passive radar mode of the ISIS Hardware at both sites. The detection distance is 800+/-2 km with an expected direct propagation path of 798 +/- 1 km. Such a propagation path is most likely due to a forward scatter event from a meteor. </p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>GBTOperation at 0.3 to 49 GHzDedicated participation High Sensitivity Array VLBI</p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>20mOperation at 2 to 9 GHzSurface RMS .8mmPrime focus opticsVLBI antennaFast 2deg/second</p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>Costs$$$ Antenna $$ Design Engineer$$ Software$ Individual Modules (but these add up) </p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>Weather/Opacity vs frequencyOpacity is similar (factor of 2) at 26 and 38 GHz GB has daily weather modelBad weather today.</p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>Weather/Opacity vs time</p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>Antenna Signal PathAll Items JAXA/ISASFeed NRAO/CaltechReceiver NRAO/Caltech/AllSatellite Sim. JAXA/CustomTransmitter CommercialTiming Tone Custom/CommercialPhase Measurement Custom/CommercialDemodulator CommercialDecoder Commercial/SoftwareRecorder Mk V/CommercialData Extraction NRAO/CustomMonitor CustomSchedule Custom </p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>NRAO Contributions/Interests$$$ Antenna $$ Software$ Low Noise Front Ends$ Uplink/Downlink phase control/detection$ Software Back Ends (real-time spectra/calibration of VSOP-2 data)Test correllationTransient SearchesContinuum imagingGalactic molecules </p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>Molecule/Transient SurveyTechnology has advanced. Digital Spectra Pulsars and Transients in 1 backendTransients at 43GHzHigh StabilityMolecule SurveyAll Sky coverage</p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>ConclusionsThe NRAO in GB Supports the Science Goals of the VSOP-2 Mission.GB will support GBT Science Observations of successful proposals.The NRAO in GB is willing to support VSOP-2 Ground Tracking.NRAOs top ground tracking priority Develop technology and software for spacecraft tracking that has applications for GB science operations.</p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>Ionospheric Incoherent ScatterFirst light detection of bistatic incoherent scatter from the F region ionosphere on a Millstone Hill to NRAO Green Bank forward path on 25 January 2006, at the common volume intersection point in geodetic coordinates: (40 deg lat, 283 deg lon, 300 km altitude). The upper data was collected using the reference Millstone Hill software radar platform in a monostatic configuration, while the lower data was collected on the MIDASMobile #001 platform at NRAO Green Bank. An uncoded 480 usec pulse was transmitted from Millstone Hill, resulting in a predicted and subsequently observed bistatic signal to noise ratio of 21 dB. Although the bistatic return appears to be approximately 80 km long in range, the actual ionospheric altitude resolution (set by common intersection volume size) is 10 km. </p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>16U SKB Shock rack EnclosureZyfer L1 GPS Frequency reference and oscillators : NTP, PPS, Modular and Expandable2 Echotek Digital Receiver cards (3 analog channels each, 14 bit ADC, digital down converters)4 Dual CPU computers per node (2 RX hosts, 2 processing), 500 GB per computer (2 TB total)Gigabit Network Switch for data interconnect, uplink, and expansion 1500W UPS system, N-connector Cables, linear power supplyAll elements monitored and controlled via EthernetISIS Hardware: MIDAS-Mobile</p><p>Glen Langston: VSOP-2 at JPL 06</p></li><li><p>Recent Test Data Obtained</p><p>Glen Langston: VSOP-2 at JPL 06</p></li></ul>