Special Study Group No V-16 of International Association of Geodesy Information- and Workingmeeting 4–7 September 1973 in Uppsala, Sweden

1974 ◽  
Vol 111 (1) ◽  
pp. 17-19
Author(s):  
Erik Tengström
Keyword(s):  
International Association ◽  
Special Study Group ◽  
Study Group ◽  
Special Study

ASSESSMENT OF ESTIMATION METHODS AND FIELD PROCEDURES FOR INERTIAL NETWORKS

1986 ◽  
Vol 40 (3) ◽  
pp. 261-276
Author(s):  
D. A. G. Arden ◽  
Calgary Alberta ◽  
K. P. Schwarz
Keyword(s):  
International Association ◽  
Cost Savings ◽  
Estimation Methods ◽  
Ground Control ◽  
Special Study Group ◽  
Marginal Effect ◽  
Study Group ◽  
Special Study ◽  
Dense Network ◽  
Smoothing Process

Inertial field procedures and postmission adjustment methods were compared and tested in the Gimli test network in southern Manitoba. This network has excellent GPS-derived ground control and a dense network of inertial traverses that make the testing of different alternatives possible. It has also been selected as one of the two test networks of the Special Study Group 1.77 of the International Association of Geodesy on the “Utilization of Inertial Techniques for Geodesy” and this paper is a contribution to the work of this group. Of the methods compared, adjustment of filtered data gives the best results. Adjustment of smoothed traverses suffers from the effects of sytematic errors introduced to the data by the smoothing process. Neither of the field procedures tested was found to be superior to the others. However, considerable savings in measurement time and costs could be achieved by using single runs along the peripheral traverses instead of the usual double runs. Cost savings of up to 20 percent are possible with only a marginal effect on the accuracy.

Special study group No 22

1968 ◽  
Vol 90 (1) ◽  
pp. 393-399
Author(s):  
R. Sigl
Keyword(s):  
Special Study Group ◽  
Study Group ◽  
Special Study

Establishment of scale and orientation for satellite Doppler positions

1980 ◽  
Vol 294 (1410) ◽  
pp. 335-340 ◽  
Keyword(s):  
International Association ◽  
Geodetic Survey ◽  
Special Study Group ◽  
Study Group ◽  
Data Sets ◽  
National Geodetic Survey ◽  
Space Systems ◽  
Coordinate Systems ◽  
Standard Data ◽  
Precise Ephemeris

The scale of satellite Doppler results and the orientation of the coordinate system in which the results are obtained, relative to more conventional coordinate systems, need to be known for many applications. Sources of this information are comparisons with external standards. Comparisons indicate that Doppler positions obtained by the National Geodetic Survey of the National Ocean Survey (with the use of its standard program and the precise ephemeris) require a longitude rotation of 0.8 ± 0.05" eastward and a decrease in scale of 0.4 ± 0.1 parts/ 10 6 to be compatible with results of other space systems. This rotation is compatible with results obtained by comparisons of astro-Doppler and gravimetric deflexions. To apply these results to those of other investigators, by using other reduction programs and techniques, will require intercomparison of programs with the use of standard data sets such as those used by Special Study Group 2.44 of the International Association of Geodesy.

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