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INIZIO_TESTO_DA_INDICIZZARE

RESEARCH PROGRAM

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Research Units
Similar research programs:
Scientific and education field classification
International Patent Classification
  • PHYSICS
    • MEASURING (counting G06M); TESTING
      • RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES [N: (for special applications, see the relevant subclasses, e.g. A61B, G01F, G01N, G02B; measuring dimensions or angles of objects G01B; navigation in general G01C; measuring infrasonic, sonic or ultrasonic vibrations in general G01H; measuring infra-red, visible, or ultra-violet radiation in general G01J; transducers per se, see the relevant subclasses, e.g. G01L, H01L, H04R; measuring direction or velocity of flowing fluids by reception or emission of radiowaves or other waves and based on propagation effects caused in the fluid itself G01P; measuring electric or magnetic variables in general G01R]; (detecting masses or objects by methods not involving reflection or radiation of radio, acoustic or other waves G01V; [N: time-interval measuring G04F]; aerials H01Q) [C9504]
Geographical classification
Bibliografia
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Biagi L., Crespi M., Manzino A., Sansò F., I servizi di posizionamento basati su reti di stazioni permanenti GNSS, Bollettino SIFET n° 1, 2006.
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Brown N., Keenan R., Richter B., Troyer L., Advances in Ambiguity Resolution for RTK Applications Using the New RTCM V3.0 Master-Auxiliary Messages, Proceedings of ION GNSS 2005, CA, 2005
Davis P., Blewitt G., Methodology for global geodetic time series estimation: a new tool for geodynamics, Journal of Geophysical Research, vol 105, no B5, May, 10, 2000
De Lacy C., Sansò F., Gil A.J., Rodriguez Caderot G., A method for the ionospheric delay estimation
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De Lacy C., Sansò F., Rodrigues-Caderot G., Gil A.J., The Bayesian approach applied to GPS ambiguity resolution. A mixture model for the discrete-real ambiguities alternative, Journal of Geodesy, Vol. 76, n° 2, 2002
De Jonge P. J., P.J.G. Teunissen, N.F. Jonkman, P.Joosten, The Distributional Dependence Of The Range On Triple Frequency GPS Ambiguity Resolution, Proceedings of ION GPS 2000, CA, 2000
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Hein. G.W., Godet J., Issler J.-L., Martin J.-C., Erhard P., Lucas-Rodriguez R., Pratt T., Status of Galileo Frequency and Signal Design, Proceedings of ION GPS 2002, OR, 2002
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Keywords
GNSS, GALILEO, MODERNIZED POSITIONING, POSITIONING SERVICES, E-GOVERNMENT, CADASTRE, REAL TIME SURVEYING, PRECISE POSITIONING

Galileo and the modernized satellite positioning

Politecnico di Milano
Abstract
The present proposal is a logical continuation of a Project financed in 2004 under the title “Satellite Positioning Services for the e-Government”. With that project a strong impulse has been given to the regional policies concerning the satellite positioning services, to the extent that most Italian regions are on their way to construct permanent GPS networks; with this action we feel we have significantly cut the technological gap with the mean level of European nations.
Now we feel it is the right time to start looking at the new phase that will see the modernization of GPS and the birth of Galileo as new technical tools on GNSS activities. We are indeed aware we have to build on significant results, consolidated at an international level, concerning:
1.optimization of the third frequency,
2.interoperability of GPS and Galileo,
3.improvement of navigational algorithms.
However we have the feeling that typical geodetic applications of the new scenario have started only in the very last years to attract more attention. We feel therefore that working on the item of the impact of satellite positioning modernization is worth for us and may contribute, as a minimum, to avoid a further delay of Italy in such techniques and maybe to produce some novel results on specific items of e-government applications. Our targets can be classified under B) as basic items or A) as applications; we refer to:

B1) impact of Galileo in defining a >>>

Principal Investigator
Fernando Sansò Politecnico di MILANO
Research Objectives
As a consequence of the research “Satellite Positioning Services for the e-government”, performed in the period 2004-2006 by more or less the same group presenting this proposal, most of Italian regional governments have today projects to develop satellite regional positioning services. On the same time the national institute IGM is organizing a new procedure to monitor and estimate the national reference service framed into IGB00. This action has prevented a completely fuzzy development of the field engaging at least regional authorities in such endeavour. The new scenario rising with the predicted modernization of GPS as well as the introduction of the Galileo system puts on us the burden of starting now to study the new dimension of services delivered by permanent GNSS networks in such a way as to avoid the birth of new technological gaps.
We are convinced in fact that although a number of operations will be directly performed in future with the unique support of the satellite segment, nevertheless the most accurate and fast services in all fields from geodynamics research down to very large scale cartography, will continue to require the support of services issued by permanent GNSS networks.
This is what we shall try to contribute at least for the Italian development and may be with some addition to the results of the international research in the field.

Timescale
24 months
National and international background
Concerning research in satellite positioning we have to consider three basic innovations.

1. The introduction of the third frequency and two new codes in the GPS signal.
Up to date, the Navstar GPS is the only positioning and navigation system that covers the entire globe 24/24 hours a day "Any Time, Any Place, Right Time, Right Place". The American Government has set aside 19 billion of dollars destinated to the modernization of the GPS system over the next few years. A new GPS satellite of the II-R block was sent up at the end of September 2005 as part of the present modernization. The modernizations will lead to a series of advantages. The new L5 signal, with a greater power and width of band, will be less susceptible to jamming. The code on the L5 frequency (10.23 MHz) will have a frequency that will be ten times greater than the C/A code. This phenomenon should improve the precision of the autocorrelation by a factor of 10; it will increase the performance of the receivers with respect to the noise and it will be increasingly easier to mitigate the multipath effect. The larger repetition rate of the new codes foreseen on the L2 and L5 frequencies will increase the performances of the autocorrelation and cross-correlation algorithms and reduce the probability of errors in the acquiring of the signal in the presence of disturbance caused by obstructions or interference. The introduction of the third frequency will allow an improvement in >>>