Summary of the May 24th 2000
Meeting of the GEOIDE Project 14
Réunion du Projet GEOIDE ENV#14
tenue le 24 mai 2000 à lHôtel Radisson de Calgary
Meeting of the GEOIDE Project ENV#14
held on May 24th 2000 at the Calgary Radisson Hotel
9:00 Mots de bienvenue /
People present at the meeting:
CRG : Rock Santerre, Mami Ueno, Annie Biron
UNB : Richard Langley, Donghyun Kim
GSD : Pierre Tétreault
9:05 Résumé des activités de recherche
depuis septembre 1999 / Summary of research activities since September 1999
Mami Ueno has compared COWLIS and
SINEM water level (information provided by the CHS and CCG) to water level obtained from
GPS (with appropriate height reduction) for several days of data (survey seasons 1998 and
1999) with different types of ships and different lengths of baselines. The use of a
priori water level information to constrain height helps to correctly fix the GPS
phase ambiguities. Results have been reported in a paper presentation at the Geomatics
2000 Conference (Montréal, March 2000) and will be presented during the next IAIN
(International Association of Institutes of Navigation) Conference (San Diego, June 2000).
A poster presentation has been displayed during the Second Annual GEOIDE Conference
(Calgary, May 2000).
Annie Biron has completed the
development of her software for the code data processing and also for the carrier phase
data processing in static mode for GPS, GLONASS, and GPS+GLONASS solutions. Data set has
been tested and analysis has been done. Rapid-static and kinematic algorithms will be
developed and coded during the summer. A poster presentation has been displayed during the
Canadian Hydrographic Conference 2000 (Montréal, May 2000). An oral presentation on this
topic has been given during the Second Annual GEOIDE Conference (Calgary, May 2000).
Rock Santerre made several
presentations about the research activities performed within the GEOIDE Project ENV#14:
CRG Seminar (Québec, December 2000), an oral presentation at the CHC Conference 2000
(Montréal, May 2000) and a poster presentation has been displayed during the Second
Annual GEOIDE Conference (Calgary, May 2000).
Donghuyn Kim has continued his
work on an optimised least-squares ambiguity search technique and on the improvement of
reliable and robust OTF solutions. Data sets from the CHS have been used for testing the
algorithms. Cycle-slips algorithms have been developed using triple, quadruple and
quintuple differences. Initial work has been done to evaluate the multipath effect at the
rover site, and the development of the ambiguity algorithms using a Kalman filter
approach. A paper on multipath divergence in carrier-smoothed pseudorange has been
presented during the CASI (Canadian Aeronautics and Space Institute) Conference (Ottawa,
May 2000). An oral presentation about Dr. Kims work has been given during the Second
Annual GEOIDE Conference (Calgary, May 2000).
Initial work has been started on
software enhancement of DIPOP to be able to process kinematic data which will include Dr.
Kims software modules. Applications are also planned for the determination of
low-earth-orbit satellite trajectories, probably as part of an IGS (International GPS
The UNB Web site now includes a
section on the assessment of the accuracy of the GPS satellite broadcast ephemerides. They
are compared daily with the IGS precise orbits.
Pierre Tétreault reported that
the GSD has started to calculate Ultra Rapid Orbits available 3 hours after the data has
been collected (contribution to IGS). In the near future, real-time orbits will be
available free of charge, as a product of the GSDs GPSC service.
Claude St-Pierre has continued to
work on the interpolation of ionospheric delays. An article on this topic has been
published in Geomatica in December 1999 and an oral presentation has been made during the
Geomatics 2000 Conference (Montréal, Mach 2000).
CHS and CCG
This information has been reported
by R. Santerre, following the discussions and the meetings with D. Langelier and G.
Marceau during the Canadian Hydrographic Conference 2000 held May 16-18, in Montréal.
From the test results obtained
during last fall, the CHS has been quite impressed by the results obtained with the Sercel
receivers. CHS has offered access to the raw GPS data collected by those receivers to be
post-processed with Viasats software Bathykin.
CHS and CCG will continue to give
access to their infrastructures (GPS data from reference stations and ships, SINECO and
SINEM water level information) to support the research activities of GEOIDE Project
A new research axis has been
proposed by the CCG to be part of the Project ENV#14. This is related to the determination
of the squat and under keel clearance of merchant ships using positioning and attitude
information provided by GPS-OTF solutions. See the next section for additional
11:00 Planification des futures activités
de recherche / Planning of future research activities
Annie Biron will continue her work
on GPS and GLONASS integration. A visit to UNB is planned for her this summer.
Mami Ueno will leave CRG for a
postdoctoral fellowship in France starting at the end of the summer. She plans to visit
UNB before her departure from Canada.
Dr. Jianjun Zhu from the Central
South University of Technology (Changsha, Hunan, China) will become a member of the CRG
Team as soon as he gets his visa for Canada.
Dr. Brian Morse, specialist in
hydrodynamics, from the Department of Civil Engineering at Laval University (and formerly
with the Canadian Coast Guard) will join the Project ENV#14 Research Team. He will be in
charge of the theoretical study of the squat and under-keel ship clearance. New GEOIDE
funding has been requested to integrate Dr. Morse into our Team.
Related to the squat and under keel
clearance research is the attitude determination of ships. A master's degree student at
the CRG (Claude Poulin) will be involved in this aspect of the research.
D. Kim will continue his work with
emphasis on the evaluation of the multipath effect (for phase observations) and the
development of ambiguity algorithms using the Kalman filter approach. A visit to Viasat
and/or at Laval University is going to be planned for this summer. Several articles and
abstracts have been submitted by D. Kim for a number of upcoming scientific meetings.
A new student from South Korea will
probably be working on the GEOIDE project.
11:55 Prochaine réunion / Next meeting
The next project meeting is
scheduled by the end of September or at the beginning of October to be possibly held at
Viasat in Montréal. The date will be announced later.
12:00 - 13:30 Dîner / Lunch
13:30 - 15:00 Échange dinformation en
recherche / Research information exchange
Dr. Kim presented in more detail
his method for cycle slip detection and his approach for ambiguity resolution using a
Kalman filter approach. This summarised his latest oral presentations that he made
recently about these topics. Questions, exchange of ideas, recommendations and further
work were addressed.
16:00 - 18:00 Table ronde GPS du Réseau
GEOIDE / GEOIDE Network GPS Round Table Meeting
See the summary written by Richard B. Langley.
Following this meeting, Dr.
El-Rabbany (TCO#51) and Dr. Gao (TCO#53) showed their interests in closely collaborating
with our Project ENV#14. Let's also recall that Dr. Langley is a participant in GEOIDE
Projects ENV#17 and RES#47.
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