National Report of Sweden to the NKG General ... - LantmÃ¤teriet

More documents

Recommendations

Info

20At the Onsala Space Observatory, anexperimental pillar was constructed forflexible mounting of GNSS antennas fordifferent scientific studies. A 3-dimensional positioning adjustmentwas mounted below the antenna.Hence the antenna can be moved indifferent directions with respect to theradome and the pillar. Meanwhile anarrangement was implemented to beable to move the radome up or downrelative to the pillar. To investigate theeffects of the different electromagneticenvironment, the observations from theexperimental pillar were obtained withdifferent geometries of the absorberand the radome, i.e. with or withoutradome, and with or without absorberbelow or around the antenna, seeFigure 3.6. The results show that theuse of the microwave absorberdecreases multipath effects up to 80 %both on the estimates of the verticalcomponent of the coordinate and theatmospheric water vapour content. Theimplementation of the hemisphericradome gives neglect effects.Figure 3.6: Photographs of theexperimental station with (top) and without(bottom) the radome having, (a) noabsorber, (b) the absorber attached bothunder and around the antenna, and (c) theabsorber attached under the antennaground plane only.3.5 Co-location workIn 2008 we performed a repeated localtie measurement at the Onsala SpaceObservatory. A laser tracker was usedto determine the reference point of the20 m radio telescope and the connectionto the IGS monument. The outcome ofthis project confirmed in general the2002 local tie work. However, the newmeasurements provided a local tie withfull covariance information.In a master’s thesis project started in2009 we did a survey of the localgravity field at the Onsala SpaceObseratory. A Lacoste-Rombergrelative gravimeter was used and alarge number of survey points at theobservatory were observed. Also thegravity tie between the old gravity hutand the new gravity hut wasdetermined.In 2009 we performed the project ’ColdMagics’ at the Ny-Ålesund GeodeticObservatory. The aim of this projectwas to achieve continuous monitoringof the local tie and local survey networkat a co-location site. A single robotictotal station was used for this projectand differential motion larger than 1was detected mm between observationtargets attached to the VLBI and GNSSmonument.In 2010 we set up a similar project atOnsala, however with the aim tomonitor different type of GNNSmonuments and the effect ofenvironmental stress on thesemonuments. This time we applied tworobotic total stations.
214. ReferencesAndersson J V (2008): A Complete Modelfor Displacement Monitoring Basedon Undifferenced GPS Observations.KTH, Doctoral Dissertation inGeodesy, Stockholm, Sweden.Daras I, Fan H, Papazissi K, FairheadJ D (2008): Determination of agravimetric geoid model of Greeceusing the method of KTH. IAG,GGEO 40 2008 Symposium, June23-27 2008, Chania, Greece.Emardson R, Jarlemark P, Bergstrand S,Nilsson T, Johansson J (2009):Measurement Accuracy in Network-RTK. SP Technical ResearchInstitute of Sweden, SP report2009:23, http://wwwv2.sp.se/publ/user/default.aspx?RapportId=10192 (cited May2010).Engberg L E & Lilje M (2006): Directprojection – an efficient approach fordatum transformation of plane coordinates.FIG 41 , XXIIIInternational Congress, October8-13 2006, 8 pages, Munich,Germany.Engberg L E, Lilje M, Ågren J (2010): Isthere a need of marked points inmodern geodetic infrastructure? FIG,XXIV International Congress,April 11-16 2010, 7 pages, Sydney,Australia.Engfeldt A, Jepsen C, Hedling G,Thorsen S O (2006): Classification ofpermanent reference stations forGNSS. NKG, PM.Eshagh M (2009): On Satellite GravityGradiometry. KTH, DoctoralDissertation in Geodesy,Stockholm, Sweden.Hedling G, Wiklund P, Lööf A, LidbergM, Jonsson B (2009): Newdevelopments in the SWEPOSnetwork. IAIN 42 , 13th WorldCongress, October 27-30 2009, 5pages, Stockholm, Sweden.Jivall L, Tangen O, Pihlak P, Häkli P,Dalane G, Lidberg M, Abbas KhanS (2010): Processing of the NKG2008 GPS campaign. NKG, 16thGeneral Assembly, September 27-30 2010, Sundvollen, Norway (inpress).Jämtnäs L, Sunna J, Jonsson B (2010):The 3 rd generation SWEPOS ®network – towards a modern GNSSreference station infrastructure.NKG, 16th General Assembly,September 27-30 2010,Sundvollen, Norway (in press).Kempe C, Alfredsson A, Andersson B,Engberg L E, Dahlström F, LohaszG (2010): The process of changingfrom local systems into SWEREF 99– a challenge for Lantmäteriet and agreat step for the municipalities.EUREF, 2010 Symposium, June 2-5 2010, 8 pages, Gävle, Sweden (inpress). Also in NKG, 16th GeneralAssembly, September 27-30 2010,Sundvollen, Norway (in press).Kiamehr R (2006): Precise gravimetricgeoid model for Iran based onGRACE and SRTM data and theLeast-Squares Modification of Stokes’formula: with some geodynamicinterpretations. KTH, DoctoralDissertation in Geodesy,Stockholm, Sweden.40GGEO = Gravity, Geoid & Earth Observation41FIG = Fédération Internationale des Géomètres(International Federation of Surveyors)42IAIN = International Association of Institutes ofNavigation
Page 1 and 2: National Report of Sweden to the NK
Page 3 and 4: 3- Provide DGPS 13 /DGNSS 14correct
Page 5 and 6: 5a flexible and redundant service,
Page 7 and 8: 7from the RIX 95 project are used f
Page 9 and 10: 9Lantmäteriet has since 2007 madei
Page 11 and 12: 11(Lidberg, 2007). The other one, t
Page 13 and 14: 132. Geodetic activities at KTH,the
Page 15 and 16: 153. Geodetic activities atChalmers
Page 17 and 18: 17comparison and evaluation offrequ
Page 19: 19importance for the operational we
Page 23 and 24: 23List of published geodetic papers
Page 25 and 26: 25International journalsNorin D (20
Page 27 and 28: 27Francis O et al. (among others En
Page 29 and 30: 29EUREF, 2006 Symposium, June14-17
Page 31 and 32: 31Tregoning & Rizos (eds) (2007):Dy
Page 33 and 34: 33International postersJämtnäs L,
Page 35 and 36: 35Swedish journalsnummer 2 april-ju
Page 37 and 38: 37Swedish conference proceedingsand
Page 39 and 40: 39Other publicationsEkman M & Ågre
Page 41 and 42: 41biases in gradiometry, Contr.Geop
Page 43 and 44: 43Kiamehr R. and Eshagh M. (2008)Es
Page 45 and 46: 45List of published geodetic papers
Page 47 and 48: 47Haas Rüdiger, Scherneck Hans-Geo
Page 49 and 50: 49the atmospheric water vapourconte
Page 51 and 52: 51April 2009, IEEE catalog number:C
Page 53 and 54: 53Olsson Per-Anders, Scherneck Hans

National Report of Sweden to the NKG General ... - LantmÃ¤teriet

Create successful ePaper yourself

Delete template?

Save as template?