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.

Personal webpage:

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

GINESTRA Workshop Print Email




Workshop's Venue in HUST Campus

The GINESTRA team is pleased to invite scientists, researchers and all the interested institutions to attend the GINESTRA workshop.

The event will be held on January 24th, 2013 at NAVIS Centre, located within the Hanoi University of Science and Technology in Hanoi, Vietnam.

Register here: (Registration Closed)
You can submit an abstract for a presentation during the workshop filling the second section of the registration page.

No registration fee is required to attend. Funding available for a limited number of delegates.

Aims and Focus of Workshop:

  • Bring together scientists and researchers from across Southeastern Asia, India and the Pacific Rim
  • Identify current state of ionospheric monitoring in the region
  • Facilitate the contact with local institutions interested in hosting new facilities or sharing existing data
  • Assess the state of the art in the field and stimulate possible partnerships for future activities
  • Explore possible future services to be jointly developed and implemented

To learn more about the workshop, please write to:

Gabriella Povero

(GINESTRA coordinator)

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Ta Hai Tung

(GINESTRA workshop organizer)

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GINESTRA Highlights


GINESTRA is a competence survey funded by the European Space Agency (ESA) in the frame of the Alcantara initiative of the General Studies Programme. Its goal is to assess the current capabilities on ionospheric monitoring in the Asia-Pacific Region and in India, in order to understand how existing facilities can be integrated with new installations to effectively support and improve space weather activities oriented to assist GNSS operations.



Southeastern Asian is a very interesting area from the ionosphere monitoring viewpoint. In this region, the ionosphere-magnetosphere coupling presents features which significantly differ from other geographical sectors. Nonetheless, ionospheric monitoring in the Asia-Pacific Region is yet uneven and there are a number of ground-based stations which are not part of monitoring networks, though known at scientific level. This lack of extended networks of monitoring stations makes peculiarities in Southeastern Asian ionosphere not exhaustively known and understood. The integration of existing facilities in international networks, as well as the planning of new installations to be set up with future collaborations, will improve current knowledge and enable effective space weather countermeasures.



GINESTRA partners represent a team of excellence, incorporating proved ionospheric theoretical know-how and technological background, especially in the field of GNSS. The team gathers researchers from:



In close collaboration with all the contacts within Asia-Pacific institutions, the GINESTRA team looks for information on existing or planned observation site and seeks institutions interested in hosting monitoring sites, thus facilitating data exchange and understanding the interests of potential users. The GINESTRA team will identify the geographical sectors not yet or only partially monitored, report peculiarities of the regional ionosphere of interest for the GNSS operations, identify and interact with entities willing to host new installations, to integrate existing facilities, to extend on-going plans or to be part of this synergetic initiative. The Asian partner, the Hanoi University of Science and Technology, will have a prominent role as a contact point to collect data in the region.



ESA General Studies Program

General  Objectives

  • To allow performing frequent scientific and technical studies of relevance to ESA programmes with a focus on international space research or an enlarged, world-wide geographical reach that space systems can enable.
  • To facilitate the involvement of leading researchers in their respective fields with a proven record and who are part of research groups that have demonstrated experience in working with partners beyond ESA Member States borders (as measured by e.g. joint publications, or patents).
  • To increase the awareness of the international research community of ESA’s activities, programmes and priorities.

Alcantara Initiative

Alcantara Competence Surveys are proposed in the context of Global Navigation Satellite Services (GNSS) programmes in order to better understand the research capabilities, facilities, activities and plans relevant to the monitoring of ionosphere perturbations in low-latitude regions and local and regional level.

Seminar on Optimising ad-hoc Network: Broadcast and Routing functions Print Email

In the framework of Growing NAVIS project, NAVIS Centre organizes a seminar with the following details:

Topic: Optimising ad-hoc Network: Broadcast and Routing functions;
Presenter: Prof. Francois Spies, University of Franche-Comté, France;
Time: 9am-10am, Wednesday, November 7th 2012;
Venue: Meeting room, R. 601, Level 6, Ta Quang Buu library building;

Abstract: A mobile ad hoc network (MANET) is a collection of mobile nodes communicating through wireless connections without any prior network infrastructure. In such a network the broadcasting methods are widely used for sending safety messages and routing information. To transmit a broadcast message effectively in a wide and high mobility MANET (for instance in vehicular ad hoc network) is a hard task to achieve. An efficient communication algorithm must take into account several aspects like the neighborhood density, the size and shape of the network, the use of the channel. Probabilistic strategies are often used because they do not involve additional latency. Some solutions have been proposed to make their parameters vary dynamically. For instance, the retransmission probability increases when the number of neighbors decreases. But, the authors do not optimize parameters for various environments. This work aims at determining the best communication strategies for each node according to its neighborhood density. It describes a tool combining a network simulator (ns-2) and an evolutionary algorithm(EA). Five types of context are considered. For each of them, we tackle the best behavior for each node to determine the right input parameters. The proposed EA is first compared to three EAs found in the literature: two well-known EAs (NSGA-II and SPEA2) and a more recent one (DECMOSA-SQP). Then, it is applied to the MANET broadcasting problem.
Additionally, multi-path routing should be considered in ad hoc network in order to realize better routing. Yet, only few multi-path ad-hoc routing protocols take into account the radio-interferences which might arise between two geographically close routes. Moreover, they generally only forbid the addition of interfering paths rather than looking for a different, more optimized, solution. NICE-MRP is a novel multi-path routing protocol for mobile adhoc networks giving efficient solutions with respect to physical radio-interferences between paths. This protocol discovers and stores several combinations of non-interfering multi-path routes.
The best multi-path route is used to transmit data, whereas alternative multi-path routes are kept to dynamically react to route breakages due to mobility and node failures. Compared to other well-known protocols, NICE-MRP presents good qualities in terms of latency, overhead and packet losses. Besides, these results end to be rather independent from the degree of mobility.

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