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Glen Langston: VSOP-2 at JPL 06
1
NRAO-GB Support for VSOP-2NRAO-GB Support for VSOP-2
Glen LangstonNational Radio Astronomy
ObservatoryGreen Bank, WV USA
NRAO Goals Support Space VLBI
Science Develop Systems
for integration into future Ground Science systems
Glen LangstonNational Radio Astronomy
ObservatoryGreen Bank, WV USA
NRAO Goals Support Space VLBI
Science Develop Systems
for integration into future Ground Science systems
Glen Langston: VSOP-2 at JPL 06
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Bi-Static RadarBi-Static Radar
Glen Langston: VSOP-2 at JPL 06
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Technology Development: “Chalmers” Feed
Technology Development: “Chalmers” Feed
0°
18
0°
0°
18
0°
Low Band (150 to 1700 MHz) Feed1 meter x 1 meter square.
Dewar
Low Bandvertical
Low BandHorizon
SignalInject
Feed Advantages:Wide Bandwidth 150 to 1700 MHz
Focus position independent of Wavelength60 degree FWHM illumination pattern
Professor Per-Simon Kildal
Glen Langston: VSOP-2 at JPL 06
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Data Acquisition SystemData Acquisition SystemVMETRO5210-JFF
VMETRO5210-JFF
5210-JFF5210-JFF
ConduantTK-200
ConduantTK-200
TK-200TK-200A/DA/DRXRX
A/DA/DRXRX
A/DA/DRXRX
A/DA/DRXRX
140 MHz IF75 MHz BW70 dB SFDR
186 MS/s12 bits
3.2 TB/chRemovableStoragePolyphase
Channelization52 sb75 MHz135-270 MB/s (w/compression)
NRAOAntenna
MEMIOMEMIO
MEMIOMEMIO
Re-OrderData(non-realtime)
3.6 TB/chFixedStorage(JBOD)
TODTOD
VME
IPATIPAT
SBCSBC
Gigabit EthernetGigabit Ethernet
ControlComputer
ControlComputer
RXComputer
RXComputer
TK-200TK-200
TK-200TK-200
5210-JFF5210-JFF
5210-JFF5210-JFF
MIT/LLMIT/LL
FPDP
VMETROEL-SB2G
FPDP II
FibreChannel
FibreChannel
FirewallFirewall
NRAOLAN
GPS/IRIGGPS/IRIG
DiskController
(400 MB/s/ch max)
Glen Langston: VSOP-2 at JPL 06
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ISIS six element Passive radar
ISIS six element Passive radar
Installed 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.
Glen Langston: VSOP-2 at JPL 06
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Passive (FM radio) RadarPassive (FM radio) Radar
Observation of scattering of 107.3 MHz FM intercepted at MIT Haystack Observatory and detected atNRAO 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.
Glen Langston: VSOP-2 at JPL 06
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Operation at 0.3 to 49 GHz
Dedicated participation High Sensitivity Array VLBI
Operation at 0.3 to 49 GHz
Dedicated participation High Sensitivity Array VLBI
GBTGBT
Glen Langston: VSOP-2 at JPL 06
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Operation at 2 to 9 GHz
Surface RMS .8mmPrime focus opticsVLBI antennaFast 2deg/second
Operation at 2 to 9 GHz
Surface RMS .8mmPrime focus opticsVLBI antennaFast 2deg/second
20m20m
Glen Langston: VSOP-2 at JPL 06
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CostsCosts
$$$ Antenna $$ Design Engineer$$ Software$ Individual Modules
(but these add up…)
$$$ Antenna $$ Design Engineer$$ Software$ Individual Modules
(but these add up…)
Glen Langston: VSOP-2 at JPL 06
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Weather/Opacity vs frequency
Weather/Opacity vs frequency
Opacity is similar (factor of 2) at 26 and 38 GHz
GB has daily weather model
Bad weather today….
Opacity is similar (factor of 2) at 26 and 38 GHz
GB has daily weather model
Bad weather today….
Glen Langston: VSOP-2 at JPL 06
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Weather/Opacity vs timeWeather/Opacity vs time
Glen Langston: VSOP-2 at JPL 06
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Antenna Signal PathAntenna Signal Path All Items JAXA/ISAS Feed NRAO/Caltech Receiver NRAO/Caltech/All Satellite Sim. JAXA/Custom Transmitter Commercial Timing Tone Custom/Commercial Phase Measurement Custom/Commercial Demodulator Commercial Decoder Commercial/Software Recorder Mk V/Commercial Data Extraction NRAO/Custom Monitor Custom Schedule Custom
All Items JAXA/ISAS Feed NRAO/Caltech Receiver NRAO/Caltech/All Satellite Sim. JAXA/Custom Transmitter Commercial Timing Tone Custom/Commercial Phase Measurement Custom/Commercial Demodulator Commercial Decoder Commercial/Software Recorder Mk V/Commercial Data Extraction NRAO/Custom Monitor Custom Schedule Custom
Glen Langston: VSOP-2 at JPL 06
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NRAO Contributions/InterestsNRAO 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 correllation Transient Searches Continuum imaging Galactic molecules
$$$ Antenna $$ Software $ Low Noise Front Ends $ Uplink/Downlink phase control/detection $ Software Back Ends (real-time
spectra/calibration of VSOP-2 data) Test correllation Transient Searches Continuum imaging Galactic molecules
Glen Langston: VSOP-2 at JPL 06
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Molecule/Transient SurveyMolecule/Transient Survey Technology has
advanced. Digital Spectra
Pulsars and Transients in 1 backend
Transients at 43GHz High Stability
Molecule Survey All Sky
coverage
Technology has advanced.
Digital Spectra Pulsars and Transients in 1 backend
Transients at 43GHz High Stability
Molecule Survey All Sky
coverage
Glen Langston: VSOP-2 at JPL 06
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ConclusionsConclusions
The 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.NRAO’s top ground tracking priority
Develop technology and software for spacecraft tracking that has applications for GB science operations.
The 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.NRAO’s top ground tracking priority
Develop technology and software for spacecraft tracking that has applications for GB science operations.
Glen Langston: VSOP-2 at JPL 06
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Ionospheric Incoherent Scatter
Ionospheric Incoherent Scatter
First light detection of bistatic incoherent scatter from the F region ionosphere on a Millstone Hill toNRAO Green Bank forward path on 25 January 2006, at the common volume intersection point in geodeticcoordinates: (40 deg lat, 283 deg lon, 300 km altitude). The upper data was collected using the reference MillstoneHill 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 bistaticreturn appears to be approximately 80 km long in range, the actual ionospheric altitude resolution (set by commonintersection volume size) is 10 km.
Glen Langston: VSOP-2 at JPL 06
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16U SKB Shock rack Enclosure
Zyfer L1 GPS Frequency reference and oscillators : NTP, PPS, Modular and Expandable
2 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 supply
All elements monitored and controlled via Ethernet
ISIS Hardware: MIDAS-Mobile
ISIS Hardware: MIDAS-Mobile
Glen Langston: VSOP-2 at JPL 06
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Recent Test Data ObtainedRecent Test Data Obtained
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