caa a22 4500 475737520 CHVBK 20180406123450.0 cr unu---uuuuu 170329e20001101xx s 000 0 eng 10.1007/s001900000115 doi (NATIONALLICENCE)springer-10.1007/s001900000115 Andersen P. H. Forsvarets forskningsinstitutt, P.O. Box 25, N-2007 Kjeller, Norway, e-mail: per-helge.andersen@ffi.no; Tel.: +47 63 807407; Fax: +47 63 807212, NO aut Multi-level arc combination with stochastic parameters [Elektronische Daten] [P. H. Andersen] Abstract.:  The method of square root information filtering and smoothing (SRIF/S) is reviewed and has been implemented in the combined square root information filter and smoother (CSRIFS) program. CSRIFS is a part of the GEOSAT space geodesy software developed at Forsvarets forskningsinstitutt (FFI, The Norwegian Defence Research Establishment). The state vectors and complete variance-covariance matrices from the analyses of a number of independent arcs of space geodesy data can be combined using CSRIFS. Four parameter levels are available and any parameter can, at each level, be represented as either a constant or a stochastic parameter (white noise, colored noise, or random walk). The batch length (i.e. the time interval between the addition of noise to the SRIF array) can be made time and parameter dependent. CSRIFS was applied in the combination of 623 very long baseline interferometry (VLBI) observing sessions. The purpose of this test was to validate the computer implementation of the SRIF/S method and to give an example of how this method can be used in the analysis of a large number of space geodetic observations. The results show that the implementation is very satisfactory. Springer-Verlag Berlin Heidelberg, 2000 Key words: Kalman filter - RTS smoother - SRIF/S - VLBI nationallicence https://doi.org/10.1007/s001900000115 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s001900000115 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Andersen P. H. Forsvarets forskningsinstitutt, P.O. Box 25, N-2007 Kjeller, Norway, e-mail: per-helge.andersen@ffi.no; Tel.: +47 63 807407; Fax: +47 63 807212, NO aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer