TOW 2013: Description of Possible Courses
There are four types of possible courses for the Technical
Operations Workshop (TOW):
- Operations Workshops
are hands-on sessions with a maximum of about 5-7 participants
each. Each member of the class will have an opportunity
to participate actively in the training.
- Maintenance Workshops
are presentations to an audience of 10-20 people.
The classes will begin with instruction and demonstration, and
there may be some hands-on training. A large fraction of the time
is allowed for discussion and question/answer periods.
The subject matter includes a variety of topics.
- Seminars
are presentations including demonstrations
to an audience of 20-60 people, depending
on the topic. The subject matter includes a variety of
special interest topics.
- Lectures
are intended for a general audience. The
subject matter includes topics that we believe are of interest to
everyone, or include announcements or information that everyone
should be aware of. All attendees at the workshop will be
scheduled for the lectures.
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Operations Workshops are hands-on sessions with a maximum
of about 5-7 participants each.
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Title: Experiment Pre-checks and Operations
Prospective teachers: Rich Strand and Mike Poirier
Description:
This is a double-length class that will include both pre-checks and
operations. This class is offered with two formats. One format is for
students with stronger English skills and will move at a faster pace.
The other format is for students with weaker English skills, will move
at slower pace, and have more pauses for material that may be difficult
to understand in translation.
Pre-checks: We will practice all of the procedures and operational tests that
should be performed before each experiment to insure that all of the
equipment is set up and working properly, starting with drudging the
schedule file and ending with pre-session e-mail to ops.
Pointing and gain calibration
will be covered in separate workshops.
This class is for people who use Mark IV, VLBA, or VLBA4 racks, and
any type of recorder, including Mark 5A and Mark 5B recorders.
The class will use the Westford Mark IV system, with appropriate
notes made about differences for other systems.
Operations: We will practice experiment operations from starting the schedule
to the post-session operational report and recovery from power
failures and other disasters that can occur during a session.
The use of the "logpl" program for plotting data
from the log during and after the experiment will be demonstrated.
This class will be held at Westford, using the Mark IV and Mark 5
recorders.
Title: Mark 5 Advanced Topics
Prospective teacher: Dan Smythe
Description:
What operators don't need to know about Mark 5, but should.
This workshop will focus on Mark 5B(+) and will cover advanced topics not
covered in the Experiment Pre-checks and Operations Workshop.
Trouble-shooting tools and techniques will be demonstrated. Theory of operation
will be discussed to provide a deeper understanding of what is happening inside
a Mark, and how it affects operations. Topics to be covered include Mark 5 stand-alone
testing, StreamStor and Mark 5 utility programs, software correlator for station checks,
voltage and temperature monitoring, and remote chassis power control.
Title: Cryogenic System and Receiver Maintenance
Prospective Teacher: Jay Redmond
Description:
This workshop will address cryogenic system and receiver maintenance from the
operational perspective. The goal is to improve system reliability, reduce
downtime, and lower operational cost. Workshop participants will receive
helpful hints for recovery from vacuum failures, contaminated helium systems,
and the use of standardized maintenance procedures with some common pitfalls
identified. General cryogenic "Do's and Don'ts" will be discussed. This
session will not address the theory of cryogenics or the internal workings
of a dewar.
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Maintenance workshops are presentations or demonstrations
to an audience of 10 or fewer people, with discussion and questions.
There may be some hands-on training.
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Title: Mark 5 Disk Module Testing and Shipment
Prospective teachers: Don Sousa
Description:
The first part of this workshop will lead participants through the testing
and conditioning of Mark 5 disk modules. Topics will include the erasing and
conditioning of a module, guidelines for mechanical inspection, and repair of
detected mechanical damage. The second part will deal with preparing the
modules for shipment, including labelling techniques and customs procedures.
Title: Automated Pointing Models Using the FS
Prospective teacher: Ed Himwich
Description:
This class will be offered at two levels. One level will concentrate on basics
for students who do not have much experience with the tools presented and want
an introduction. The other level will be for students with more experience or
want to address more advanced topics. The course will cover basic support for
pointing measurements in the Field System. It will also include a demonstration
of the "pdplt" program for analyzing pointing data. It will describe basic
principles for configuring the mdlpo.ctl and ctlpo.ctl files
that control the automated pointing data acquisition and delogging processes.
Gain calibration will be covered in separate workshops.
Title: Antenna Gain Calibration
Prospective teacher: Michael Lindqvist
Description:
This course covers using ONOFF and GNPLT. Instruction will be given on the
preparation and execution of ONOFF for the automatic acquisition of amplitude
calibration data. Attendees will learn about the necessary procedure files,
methods of measuring noise diode temperature and gain curves, and the
interpretation of the resulting log files. The course will provide basic
instruction on analyzing gain calibration data with GNPLT. Typical tasks
(such as calibration of Tcal and gain curves) will be described step-by-step,
a general discussion about GNPLT data analysis capabilities will also be held.
Some time will be reserved to include the possibility of giving feedback and
requesting improvements in the features of the gain calibration tools.
Title: Generating ANTAB Tsys Files (ANTABFS)
Prospective teacher: Uwe Bach
Description:
ANTABFS is used at astronomy stations to format Tsys data for use in analysis.
Currently, this is not used for geodesy, but will be eventually. This course
does not need to be attended by students from geodesy only stations.
This class will describe use of the ANTABFS suite of scripts for producing
well-calibrated and formatted system temperature and gain curve tables,
suitable for use in the common data analysis packages. It will include some
explanation of how the information is obtained and why good quality amplitude
calibration is important; and some examples of typical errors will be
presented. There will be a live demonstration of the scripts.
Title: RFI Sources, Identification, Mitigation
Prospective teacher: Brian Corey
Description:
This workshop will discuss sources of interference that might affect
VLBI observations. Particular emphasis will be placed on the
levels and types of RFI that are most harmful to experiments. Also
discussed will be techniques to identify RFI and (the limited range
of) techniques to deal with it. The workshop will also give a short
status report about the RFI survey currently undertaken for the
VLBI2010 project.
Title: Phase Cal Basics and RF System Testing
Prospective teacher: Brian Corey
Description:
The phase calibration system is the primary means for ensuring that
instrumental effects in the receiver and VLBI terminal do not corrupt
the group delay measurements. This course will cover the basic concepts
and hardware implementation of the calibration system, including the
Mark IV cable measurement system. The nature and causes of spurious
signals, which can degrade the calibration accuracy, will be described.
Following the phase cal basics we will review the fundamentals of measuring
a power spectrum with an analog RF or FFT-based spectrum analyzer.
Applications to VLBI system testing and trouble-shooting will be
discussed and demonstrated, with a particular emphasis on phase noise
and modulation in LO and phase calibration systems. The detection of
spurious phase cal signals with a spectrum analyzer will also be treated,
along with the diagnosis and cure of such signals.
Title: Hardware Maintenance
Prospective teacher: Rich Strand and Mike Poirier
Description:
This workshop will cover checkout and maintenance aspects of
the VLBI electronic racks. Areas to be covered include formatter
checkout, VC/BBC performance, and IF distributor checkout.
Title: Hydrogen Maser Monitoring and Maintenance
Prospective teacher: Irv Diegel
Description:
The intent of this workshop is to provide VLBI
personnel with an overview of the hydrogen maser and its use in VLBI.
The discussion will be generic so as to accommodate the different types
of masers used throughout the VLBI network. Topics will include block
diagram analysis of the physics and electronics systems as well as
generalized operational procedures.
Title: Mark 5 and RDBE OS Software Development
Prospective teacher: Chet Ruszczyk
Description:
The Mark 5 VLBI and eVLBI community needs a stable and up-to-date OS
to help continue the development of technologies and maintain a secure
environment. After considerable investigation, we have selected a
Debian-based distribution as the new OS and will explain the deployment
and upgrade for current Mark 5 systems out in the community. Moving the
Mark 5 to a Debian-based OS will make the Mark 5 more similar to FS,
which is also Debian based. The reasons for moving to the new OS will
be explained, as well as the details of making the changeover and the
differences that will be encountered.
Title: Advanced Pre-checks and Operations
Prospective teachers: Ed Himwich and Brian Corey
Description:
This course is intended to provide a description of the tests that stations should
periodically perform to evaluate the performance of their station. These checks are more
advanced than the ones covered in the Experiments Pre-checks and
Operations course, but most are covered in more detail in other courses. This course
works through the list of checks, explains the reasons for the tests, provides some tips
on performing them, how to use systests scripts for automating and analyzing
measurements, and a chance to ask questions about them. The systests scripts
are an important tool for testing and verification for stations that have Mark IV Decoders.
They will be expanded in the future to support stations that do not have Decoders, but do
have Mark 5B recorders. In order to have a full grounding in this material it
is recommended that anyone signing up for this course should also take some other courses
unless they are already familiar with the material in these courses. The recommend other
courses are: RFI Sources, Identification, Mitigation, Phase
Calibration Basics, and Spectrum Analyzer Testing of Analog RF
Systems. Some additional material on troubleshooting not covered in other courses
will be presented here.
This course will also give an introduction on how VLBI electronics works. The
VLBI signal path will be traced through a receiver/backend block diagram.
It will touch on what can be monitored with the Field System and point
out parallels and differences between analog (BBC/VC) and digital (DBBC/RDBE)
techniques.
Title: Practical Correlation
Prospective teacher: Alessandra Bertarini and Mike Titus
Description:
Hands-on activities on the DiFX: brief introduction on what a correlator is,
preparation of files for correlation, correlation and search for fringes with
interpretation of the fourfit output. Various exercises to detect common
problems at stations that would need to be resolved. This seminar will also
deepen the understanding of the correlator reports. The aim of the exercises
is to promote the mutual understanding between stations and correlators.
Students are encouraged to put questions related to their stations to the
representatives from the correlators, who will be available for personal
discussions throughout the duration of the TOW.
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Seminars are presentations including demonstrations
to an audience of 10 or more people, depending on the topic.
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Title: Introduction to the K5 System
Prospective teacher: Mamoru Sekido
Description:
This seminar will describe the K5 system being developed in Japan.
The entire data acquisition functions and correlator functions can
be performed on a common PC system running on Linux or FreeBSD.
The K5 system is now regularly used at IVS stations in Japan and
at Syowa station in Antarctica. Actual data acquisition and some
post-observation data checks will be demonstrated.
Title: Pointing and Single Dish Amplitude Calibration Theory
Prospective teachers: Uwe Bach
Description:
In this course students will learn why accurate pointing corrections
must be known for all parts of the sky to be observed, and how pointing
errors affect geodetic and astronomical results. Students will
learn how SEFD and system temperature measurements are related,
how to check the focus, how to make SEFD
measurements, how to measure a gain curve, which sources are best
for the SEFD measurements, how weather can affect the measurements
and results, and how the SEFD measurements are used for data
analysis and scheduling. We will also discuss measurement
equipment and how it may affect the results if care is not taken.
Title: Timing Systems
Prospective teachers: Tom Clark and Richard Hambly
Description:
This presentation will discuss all the reasons for needing high-accuracy
time and frequency in VLBI. This will include a discussion of all the
"clocks" used in VLBI (Hydrogen Masers, GPS timing clocks, the
clocks inside the Field System computer and the clock information
needed by the correlators) and how they need to be tied together in
order to guarantee successful VLBI measurements.
Title: Topics in FS Station Software Coding
Prospective teacher: Ed Himwich
Description:
This session will be organized as a group discussion/demonstration. It
will provide an opportunity for people to present questions they have
about implementing specific station features and to get advice on how to
do it. A separate lecture covering more of the basics of station
software coding is covered in the "Writing station specific FS code"
lecture.
Title: DBBC Setup and Operations
Prospective teachers: Gino Tuccari
Description:
This seminar will give an introduction into the installation and
operations of the digital backend DBBC.
Title: RDBE Setup and Operations
Prospective teachers: Chris Beaudoin
Description:
This seminar will give an introduction into the installation and
operation of the digital backend RDBE.
Title: e-VLBI Overview
Prospective teacher: Chet Ruszczyk
Description:
The transmission of VLBI data via high-speed networks, dubbed 'e-VLBI',
is developing rapidly. This seminar will explain the basics of e-VLBI.
Topics covered will include general topics such as the advantages of
e-VLBI and types of networks. But also more detailed questions such as
how to extract data files from the Mark 5 system for e-VLBI operations
will be discussed.
Title: e-transfer Operations
Prospective teacher: Simone Bernhart
Description:
This course will cover operational aspects of performing e-transfers of
data between stations and correlators.
Title: FS Remote Operations
Prospective teachers: Alexander Neidhardt and Jim Lovell
Description:
We will show the FS remote interface (e-RemoteControl) for users to see
and offer feedback on. The related Ethernet communication infracstructure
for the FS will also be briefly described.
Title: Cablewrap and Antenna Interface
Prospective teachers: Ed Himwich
Description:
We will describe the principles of the antenna cablewrap and how your antenna
interface should manage the wrap.
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Lectures are intended for a general audience.
All attendees at the workshop are welcome to attend the lectures.
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Title: VLBI Basics
Prospective teacher: Alan Whitney
Description:
This lecture will describe the VLBI technique from scheduling to data
capture, to correlation and to analysis. It will cover the basic concept,
observational system, delay resolution function, correlation, and observables.
Title: Impact of Operations on Data Analysis
Prospective teacher: Ed Himwich
Description:
This course will describe the effect on geodetic data analysis of
various problems during data acquisition. Problems such as clock
breaks, bad tracks, parity errors, pointing errors, warm receivers,
and late starts will be covered.
Title: Science Overview
Prospective teacher: David Gordon
Description:
An overview of the scientific goals of geodetic and astrometric
programs will be presented. Particular emphasis will be placed on
reference frames which are the fundamental products of VLBI.
Title: Field System Near Term Future Plans
Prospective teacher: Ed Himwich
Description:
This presentation will cover the immediate and long-term plans for
Field System development. The ongoing collaboration and cooperation on
the Field System among various groups will be described.
Title: Broadband and the Evolution of the VGOS Network
Prospective teacher: Arthur Niell
Description:
After a short review of the history of geodetic VLBI and a summary
of recent results, the presentation will deal with future perspectives.
The goals and requirements of the next generation VLBI system, called
VLBI2010, will be described. Based on extensive simulation studies,
strategies have been developed to significantly improve product
accuracy through the use of a network of small (12-m) fast-slewing
antennas. A new method for generating high precision delay measurements
and improved methods for handling biases related to system electronics,
deformations of the antenna structures, and radio source structures
have been developed. The presentation will conclude with an overview
of the various VLBI2010 projects anticipated to result in a global
VLBI2010 network in the foreseeable future.
Title: Mark 6 System Description
Prospective teacher: Alan Whitney
Description:
A next-generation VLBI data system based completely on commercial off-the-shelf
hardware (COTS) is being developed at MIT Haystack Observatory. Several
demonstrations at sustained 8-Gbps recording have been successfully completed.
The Mark 6 system will be described in detail.
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Further information:
IVS Coordinating Center
ivscc@ivscc.gsfc.nasa.gov
Last updated: February 8, 2013