Meetings
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First VLBI2010 Working Meeting
September 15, 2006
MIT Haystack Observatory
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Overview
Keynote
Format
Participants
Agenda
Logistics
Discussion Papers
The primary function of the VLBI2010 Committee (V2C) is to
promote and guide research into the improvement of the "technique" of geodetic VLBI. The
committee takes an integrated view of VLBI and evaluates the effectiveness of proposed system
changes based on the degree to which they improve IVS’s final products. In addition, the
committee takes responsibility for encouraging the implementation of the recommendations
of WG3. Please find more information on the
V2C homepage.
The most urgent issue facing the V2C is the definition of specifications for the VLBI2010 antenna.
This is needed to support current proposals for new geodetic VLBI antennas in Australia,
Korea, Germany, and possibly elsewhere. There is risk involved in the process because the
favoured method for determing the delay observable, the "S-Ku broadband delay" approach,
has never been tested. Although plans exist to test it, results are not anticipated for at
least a year. The focus of this meeting will be to study the "S-Ku broadband delay" approach
theoretically to see whether or not enough confidence exists to use it as a basis for
determining the VLBI2010 antenna specifications.
Briefly, the "S-Ku broadband delay" approach involves the use of a large number of IF bands
to unambiguously determine the RF phase. It requires the use of a broadband feed such as the
Kildal feed, and opens up the possibility of determining the very precise phase delay even
at modest SNRs. Complicating factors, which need to be studied, include the effect of source
structure, non-linearity and instability of the feeds/electronics/ cables, RFI, and possibly
others.
Although other topics relating to improvement of VLBI results will be considered for this meeting,
they will only be included if time permits.
The format of the meeting will be similar to that of the East Coast VLBI Meeting that many
of you attended last year. A number of short informal presentations will be made. These are
not intended to be polished final reports, but simply works in progress. They will be used as
a stimulous for discussion. The presenter will then moderate discussion on that topic.
The time for each presentation and discussion will be flexible so that the depth of treatment
can reflect interest and perhaps the diversity of views.
Prior to the meeting it is expected that written summaries of the work to be presented will
be distributed so that attendees can be better prepared with questions, comments and ideas
for the following discussion.
There are currently 31 participants registered for this meeting.
Please notify the Coordinating Center if you
detect an error in the list of participants.
We anticipate a long event, with the working meeting starting early and ending late. The
draft agenda outlines the topics and their approximate times. The
actual times, however, will be dependent on the evolution of the meeting.
The First VLBI2010 Working Meeting is an add-on to the
Fifth International e-VLBI
Workshop and shares the logistics of that meeting. Please refer to the e-VLBI meeting
page for hotel and travel information. There is no registration fee, but
the cost for food will be shared among the participants. There will be breakfast, lunch,
coffee breaks, and a full dinner—all being served at Haystack Observatory. Please be
prepared to pay $55 at the meeting. Notify
Heidi Johnson if your plans change, so that
amendments can be made.
On September 15, we will meet in the lobby of the Sheraton Tara Hotel, Nashua, NH at
7:30 a.m. in order to organize the car pooling to Haystack Observatory.
Please find here the discussion papers for the meeting:
Session 1: Goals of Meeting and Simulations
- V2C Simulations at IGG Vienna (Joerg Wresnik, Johannes Boehm):
PDF
- Simulations at GSFC Using Solve (Dan MacMillan):
PDF
Session 2: Source Structure, Schedules, and Multiple Antennas
- UV Coverage of New High Density Schedules (Toni Searle):
PDF (4 MB)
- Source Structure Examples (Arthur Niell):
PDF
- The Effect of Selected Sources on Broadband Delay Performance (Bill Petrachenko):
PDF
- Multiple Antennas at a Site (Bill Petrachenko):
PDF
- Number of Sources (Arthur Niell):
PDF
Session 3: Electronics
- Notes on broadband feeds (Brian Corey):
PDF
- Polarization issues (Brian Corey):
PDF
- Notes on phase/delay stability of cable and electronics (Brian Corey):
PDF
- Simulations of Broadband Delay Measurements (Alan Rogers):
PDF
- Calibration of Broadband Geodetic VLBI (Alan Rogers):
PDF
- Notes on cable length measurement systems (Brian Corey):
PDF
- Clock and Calibration for VLBI2010 (Tom Clark):
ppt
Session 4: Troposphere, RFI, and EVN Plans
- RFI Scope and Reduction Approaches (Gino Tuccari):
ppt
- A Simple Approach to Handling RFI (Bill Petrachenko):
PDF
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