NAVIS Representatives brief the Minister of Science and Technology Print Email

From left to right: Prof. Gustavo Belforte (International Co-director), Prof. Nguyen Quan (Minister of Science and Technology), Dr. Ta Hai Tung (Director) and Dr. La The Vinh (Researcher)

On the morning of Tuesday 22nd January the representatives of the NAVIS Centre paid a visit to the Ministry of Science and Technology (MOST) and briefed the Minister Prof. Nguyễn Quân on the successful activities carried on so far as well as on the ongoing ones and those planned for the future.

The presentation has focused on the R&D achievements and ongoing activities such as the operation, in the premises of the NAVIS Centre, of two monitoring stations for the JAXA and the ESA.

Prof. Gustavo was reporting to the Minister

The strong international links of the Centre have been described together with its scientific results in terms of scientific publications, organization of workshops and seminars, participation to conferences that took place in the last year and are foreseen for 2013.

The Minister was impressed with the achievements of NAVIS in the past year and expressed his willingness to support NAVIS in its activities.

Seminar on Multipath Mitigation by Prof. Lawrence Lau, The University of Nottingham Ningbo China Print Email

Time: 15.30, Friday 25th January 2013

Place: Vietnamese German Centre, HUST Campus

Abstract: Phase multipath is one of the most crucial error sources in centimetre or millimetre level GNSS high precision positioning.  Short-delay multipath is still especially difficult to detect or mitigate by the state-of-the-art hardware-based techniques.  Therefore, processing algorithm-based multipath mitigation methods are crucial for the further improvement of positioning accuracy, either integrated with other techniques or in a stand-alone mode.   This seminar describes the background of GNSS multipath errors, effect of multipath, hardware-based multipath mitigation techniques, and processing algorithm-based multipath mitigation techniques in particular. Before presenting the technical content, a brief introduction of the University of Nottingham Ningbo China (UNNC) is given. 


Biography: Lawrence Lau is an Assistant Professor in Geodesy and Surveying at the University of Nottingham Ningbo China (UNNC). He obtained his PhD at University College London (UCL) in 2005. Before joining UNNC, he worked as an Associate Professor in the Institute of Geomatics in Barcelona from March 2010 to September 2011. In 2004 – 2010, he was a Postdoctoral Research Fellow at (UCL), UK. In his about 6 years at UCL he worked on several research projects, including two UK EPSRC-funded research project called SPACE, iNsight, two EU FP6 projects called BEAR and ANASTASIA, and two consultancy projects. SPACE was undertaken by a consortium of eleven UK university and industrial groups and iNsight (an on-going project) is undertaken by a consortium of thirteen UK university and industrial groups. Before joining UCL, he worked as a technical analyst in the Nottingham Scientific Ltd. (2002 - 2004) in design and development of the new European GNSS (Galileo); he worked on two European Commission (EC) and European Space Agency (ESA) funded Galileo System Test Bed (GSTB-V1: Orbit Determination and Time Synchronisation, and GSTB-C0) projects. In 1999 – 2002, he worked in the Hong Kong Polytechnic University as a Research Associate for several vehicle navigation projects.

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Seminar on Space Utilization presented by Dr. Toshiaki Iwata, AIST, Japan Print Email

Seminar on Space Utilization

Time: 14h00-15h30, Monday, January 14th, 2013

Place: 601, Meeting room of the NAVIS Centre,Ta Quang Buu library building

Presenter: Dr. Toshiaki Iwata, Geoinformatics research group, Information Technology Research Institute, National Institute of Advanced Industrial Science and Technology.


14h00-14h30: Proposal for Vietnam Space Projects
As proposals for Vietnam space projects, Landsat 8 International Cooperators, QZSS positioning users, and forest fire detection as a UNIFORM member (small satellite applications). Although the first and third one are for VNSC/VAST, the presenter will introduce shortly. The second one is the main topic of this presentation.

14h30-15h00: Space Utilization in Vietnam
This presentation summarizes the interviews and responses for the proposals of the presenter during his stay in Vietnam (2012.12.11 – today). The corresponded organizations are:

  • Vietnam National Satellite Center (VNSC), VAST
  • Institute of Geography, VAST
  • Institute of Information Technology, VAST
  • Hanoi University of Science and Technology (HUST)
  • FPT University
  • Institute of Marine Geology and Geophysics (IMGG), VAST.

15h00-15h30: Survey of Small Satellite development in Japan (2007)
These days, universities and small companies are developing small satellites all over Japan. To develop small satellites, each university or company uses techniques (design, manufacture and testing) that are completely different from traditional methods of large satellites for reduction of cost and time. The presenter investigated the actual status (commercial-off-the-shelf products), each testing method of space environments, issues of testing for small satellites, demand and system with literary documents, questionnaire and interview.

Short Biography of Presenter:
Dr. Toshiaki Iwata was born in 1959 in Osaka, Japan. In March 1984, he received Master Degree of Engineering from Osaka University. In April 1984, he joined with the Electrotechnical Laboratory, former AIST. In June 1994, he got the PhD degree from Osaka University. His current assignment is a Senior Research Scientist, Geoinformatics research group, Information Technology Research Institute, National Institute of Advanced Industrial Science and Technology.

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First Acquisition and tracking, in Vietnam, of the first four Galileo IOV Satellites Print Email

Galileo signal decoding team, from left to right: Eng. Truong Minh Duc, Mr. Tran Thanh Trung, Eng. Nguyen Dinh Thuan, Dr. La The Vinh

From 15h25 to 19h25, December 17th, 2012, the first four satellites of the Galileo system were visible at the same time in the sky of Hanoi, Vietnam for about one hour. It was the first time in which the satellites were visible together from Hanoi after all of them started transmitting their E1 signals.

The researchers of the NAVIS Centre in the Hanoi University of Science and Technology could, for the first time, receive the signals of all the four satellites and track them with the Software Receiver that was recently developed in the NAVIS Centre.

The signals were received at the NAVIS Centre (105.8372oE, 21.0341oN). At the time of successful acquisition and tracking the four satellites (PFM, FM2, FM3, FM4) were broadcasting a Galileo Open Service signal on E1 band. In particular satellite PFM was using Code Number 11 of the Galileo Interface Control Document (ICD) while satellites FM2, FM3, and FM4 were using Code Number 12, 19, and 20.

Figure 1. Skyplot of Galileo satellites at the time of the experiment (4 satellites in Hanoi's sky)


Figure 2. Ground traces of Galileo satellites

In Figure 1 and 2 (that have been obtained with the free software tool, Orbitron, © by Sebastian Stoff) the orbits of the four Galileo satellites are reported at the time of signal acquisition.

First acquisition and tracking results for the signals of all the four satellites are reported in the following figures.

Figure 3. Acquisition results of the 4 satellites

Figure 4. Outputs of DLL tracking loop

The demodulation of the E1b data channel of the four satellites has also been performed checking the content of the navigation message. It has been found that, while satellite FM2 had a valid navigation message, satellites PFM, FM3, and FM4, on the contrary, have a dummy one, so that it has not been possible to perform the first fully Galileo fix point.


Figure 5. Power of received signals

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