Summary of the May 24th 2000 Meeting of the GEOIDE Project 14

Réunion du Projet GEOIDE ENV#14
tenue le 24 mai 2000 à l’Hôtel 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 / Welcome addresses

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. Kim’s 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. Kim’s software modules. Applications are also planned for the determination of low-earth-orbit satellite trajectories, probably as part of an IGS (International GPS Service) project.

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 GSD’s GPS•C 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).


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 Viasat’s 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 ENV#14.

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 information.


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 d’information 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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