Införande av SWEREF99 som nytt referenssystem på RFN
Abstract (Summary)Robotförsöksplats Norrland (RFN = Vidsel Test Range), has been the main site for missile testing in Sweden since 1958. It has Europe’s largest test range over land, with an area of more than 1600 square kilometres. Radars, kinotheodolites, telemetry and cameras are used to monitor the test object during flight. Following the missile trajectory and registering position data is central to the testing.All position data is collected by the command and control software, BAPS, and used to present real time position information on a map to support the personnel responsible for the test. The data can also be processed after the test to generate more exact evaluation of the flight.In 2001 a new geodetic reference system, SWEREF99, was introduced in Sweden. Unlike the old system it replaced, RT90, this new system is a truly global three dimensional system. Since all positioning is done in relation to a geodetic reference system, and since positioning is at the core of the activities at RFN, it is of great importance to investigate how the introduction of this new reference system would affect RFN. That is the aim of this report.There is really no question about if SWEREF99 should be introduced at RFN. For several reasons it should be. In the last five years most authorities, companies and municipalities in Sweden have adopted this new system, replacing RT90 or local systems, and others will follow. Coordination with these entities would be much simplified if RFN used the same reference system. Further, SWEREF99 is a global system, closely following the GPS-system, WGS84. Using this new system allows RFN to fully utilise GPS technology. Finally, since many test range customers come from other countries, a global system simplifies coordination with them as well.Today RFN uses a combination of the old national system, RT90, and a precursor to SWEREF99, the preliminary reference system SWEREF93. This later system differs from SWEREF99 by less then a decimetre, and is used in three dimensional Cartesian form in BAPS, whose algorithms transforms data to and from the test systems to that system.The first step of the project was to establish transformation parameters between the new system and the old ones. This was done using methods developed by the Swedish Land Survey Office to help municipalities introduce the new system in a project called RIX-95. Using these parameters it was possible to transform all coordinates for reference points, sensors, runways and other equipment stored in the RFN geo database.Next step was an analysis of the command and control software, BAPS, in order to understand what changes would be necessary when introducing SWEREF99. In most cases it turned out that changing the software sensor position list was enough to ensure that the system would retain its functionality, but using the new reference system instead.In some cases, though, it became necessary to alter the source code to the software, adding subroutines to transform coordinates between SWEREF99 and the old systems SWEREF93 and RT90. These changes have been made, and the resulting code added to this report as appendixes together with various documents related to the transformation of coordinates. Most of the calculations and resulting tables, formulas and parameters are presented in the main body of the report only.Implementing the changes recommended in this report will introduce SWEREF99 at RFN, maintaining all present functions in the test and command and control systems. There are also some recommendations for changes that would be beneficial to carry out in a longer perspective. Apart from further changes in the software recommendations include reconnaissance of existing reference points around the Vidsel airport, and the introduction of a geodetic survey manual for personnel involved in surveying at the test range.
School:Högskolan i Gävle
Source Type:Master's Thesis
Keywords:vidsel test range
Date of Publication:10/27/2008