Book review     

Fernando Sansò  Helmut Moritz 《Journal of Geodesy》1989,63(2):I-II

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Signal and noise in S.L.R. data     

B. Betti  M. Carpino  F. Migliaccio  F. Sansò 《Journal of Geodesy》1987,61(3):235-260

The problem of judging on model deficiency in S.L.R. data treatment is considered. In particular the correlation analysis of residuals of adjusted orbits is used to show the presence of unmodelled signals. This analysis seems suitable at least for a proper preprocessing of S.L.R. data, in the sense of being an efficient procedure of outliers rejection.  相似文献   

Finite covariance functions   总被引：1，自引：0，他引：1  

F. Sansò  W. -D. Schuh 《Journal of Geodesy》1987,61(4):331-347

Because of the full covariance matrices and the computer storage limitations the number of measurements which can be handled by the collocation method simultaneously, is limited. This paper presents a method to compute covariance functions with a finite support yielding sparse covariance matrices. The theoretical background is pointed out and, for the one- and two-dimensional case, special functions are developed which can be combined with the usually used covariance functions to get a “finite covariance function”. Simulated examples to demonstrate the behaviour of different solution methods to solve these special, sparse covariance matrices supplement our investigations.  相似文献   

Further remarks on the altimetry-gravimetry problems     

F. Sacerdote  F. Sansò 《Journal of Geodesy》1987,61(1):65-82

The two Altimetry-Gravimetry linearized boundary value problems, both characterized by gravity anomaly boundary data on the continents, while on the oceans either the gravity potential or its radial derivative is assumed to be known, are investigated in their modified version, in the spherical boundary approximation. A constant unknown bias is added to the data set on the oceans, while a vanishing zerodegree harmonic component is assumed as additional constraint. Existence, uniqueness and regularity results are obtained, it is proved that, in order to obtain regularization of the solution, not only regular data must be imposed, on the continents and on the oceans, but suitable constraints on the coast line are needed.  相似文献   

Report on the International School of Advanced Geodesy “Optimization and Design of Geodetic Networks”     

F. Sansò 《Journal of Geodesy》1985,59(1):105-106

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On the sun's pole-equator flux differences     

Gaetano Belvedere  Lucio Paternò 《Solar physics》1977,52(1):191-198

We study the possibility that large flux differences between the poles and the equator at the bottom of the solar convective zone are compatible with the small differences observed at the surface. The consequences of increasing the depth of the convective zone due to overshooting are explored.A Boussinesq model is used for the convective zone and we assume that the interaction of the global convection with rotation is modelled through a convective flux coefficient whose perturbed part is proportional to the local Taylor number. The numerical integration of the equations of motion and energy shows that coexistence between large pole-equator flux differences at the bottom and small ones at the surface is possible if the solar convective zone extends to a depth of 0.4R . The angular velocity distribution inside the convective zone is in agreement with the -dynamo theories of the solar cycle.  相似文献   

The Bayesian approach applied to GPS ambiguity resolution. A mixture model for the discrete–real ambiguities alternative     

M. C. de Lacy  F. Sansò  G. Rodriguez-Caderot  A. J. Gil 《Journal of Geodesy》2002,76(2):82-94

 The problem of phase ambiguity resolution in global positioning system (GPS) theory is considered. The Bayesian approach is applied to this problem and, using Monte Carlo simulation to search over the integer candidates, a practical expression for the Bayesian estimator is obtained. The analysis of the integer grid points inside the search ellipsoid and their evolution with time, while measurements are accumulated, leads to the development of a Bayesian theory based on a mathematical mixture model for the ambiguity. Received: 29 March 2001 / Accepted: 3 September 2001  相似文献   

Interpretation of the solar-like pulsational behaviour of η Bootis     

Maria Pia Di Mauro  JØrgen Christensen-Dalsgaard  Lucio Paternò  Francesca D'Antona 《Solar physics》2004,220(2):185-198

HR 5235, better known as η Bootis, is a bright and well-known star for which very accurate observations have recently enabled Kjeldsen et al. (2003) and Carrier, Bouchy, and Eggenberger (2003) not only to confirm the presence of solar-like oscillations, but also to identify the excitation in the oscillation spectrum of several p-mode frequencies with harmonic degrees l = 0 – 2. Here we show how such observational success, through the calculation and the investigation of theoretical structure models and the comparison of the observed oscillation spectra with the predicted p-mode frequencies of oscillations, permits one to draw conclusions about the actual evolutionary state of this star and on the physical properties of its internal structure. The computation of the structure models is based on the use of updated global parameters and includes overshooting from the convective core. In particular, we consider the effect on the stellar structure, and hence on the theoretical frequencies, of employing different equations of state and different formalisms to describe the convective energy transport.  相似文献   

Quelques considérations sur la tension magmatique et sur la “température d’ irrigidimento”     

G. Imbò 《Bulletin of Volcanology》1959,22(1):125-133

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Carbonate pseudotachylytes: evidence for seismic faulting along carbonate faults     

Alfio Viganò  Simone Tumiati  Sandro Recchia  Silvana Martin  Marcello Marelli  Riccardo Rigon 《地学学报》2011,23(3):187-194

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