CDDIS Bulletin - June 1989
Volume 4 No.5

In this issue:

• Cover:
  • Global SLR and VLBI Sites
• Articles:
  • Analyzed Results Available in the CDDIS
• Data Bits and Bytes:
  • Test Set of SLR Normal Points

On the cover: Global SLR and VLBI Sites

Analyzed Results Available in the CDDIS

The NGS VLBI Analysis Group has recently submitted a new mobile VLBI solution to the CDDIS. The solution, derived using the SOLVE3 least squares adjustment program, includes mobile VLBI site positions, horizontal vector motions, and weighted RMS values of the latitude, longitude, and height components. The CDDIS data base tables containing these results are as follows:

POSITIONSMV_VLBINGS -- Mobile VLBI site positions
HORIZONTALMV_VLBINGS -- Mobile VLBI horizontal vector motions
HORIZONMV_VLBINGS -- Mobile VLBI weighted RMS values of latitude, longitude, and height components

In addition, the Delft University of Technology (The Netherlands) has submitted their 1986 and 1987 SLR station positions and earth rotation parameters from their DUT/SOM LSC 89.3 solution.

POSITIONS86_SLRDUT -- SLR station positions for 1986
POSITIONS87_SLRDUT -- SLR station positions for 1987
ROTATION_SLRDUT -- Earth rotation parameters for 1986 and 1987

Pre-programmed queries for these data sets are available through the DIS Query Menus (DIS Main Menu Item 4). Help information on the analysis methods used in both of these solutions can be found through the DIS Help Facility (Main Menu Item 1).

DATA BITS AND BYTES

This section is designed to give brief notices of special events or problems encountered in recent months.

Test Set of SLR Normal Points

The Bendix Data Services group has recently completed the generation of a test set of SLR normal points. This data set was produced using the A version of the January 1989 LAGEOS full-rate SLR data. Select SLR data users have been identified for review of these data. The data set is in the MERIT II format with the appropriate data correction flags set. All normal points are computed and output with refraction applied (if the refraction correction was not applied in the full rate, a refraction correction for each point was computed from the ranges and applied before computing the normal point). The normal points were computed and output using the center of mass correction as applied in the full rate (if no center of mass was applied in the full rate then the normal point does not include the center of mass correction). All computed normal points have an epoch at the satellite (light time correction applied).