【文章內(nèi)容簡介】 ring platform already can constitute millimeter level the global coordinates frame. 3. RTK technologies The conventional GPS measuring technique, like the static state, the fast static state , the dynamic survey all~eed afterwards to carryon the solution to calculate can obtain a centimeter level the precision, but RTK is can realtime obtain the centimeter level pointing accuracy in the open country the measuring technique, it has used the carrier phase dynamic realtime difference (Realtimekinematics) the method, is the GPS application significant milestone, its appearance for the project layout, the terrain mapping, each kind of control survey has brought the new dawn, enormously enhanced the field operation work efficiency. The high accuracy GPS survey must use the carrier phase observation value,the RTK localization technology, it can realtime provide in assigns in the coordinate system the three dimensional localization result, and achieves the centimeter level precision. Under the RTK work pattern, the datum stands through the data chain transmi ts together its observation value and the survey station coordinates information for the mobile station. Mobile stands not only receives the data through the data link which stands from the datum, but also must gather the GPS observation data, and poses the difference observation value in the system to carryon the realtime processing, simultaneously produces the centimeter level localization result, a lasted. The mobile station may be at the static condition, also may be at the state of motion。 May first carryon the initialization after the fixed point to enter the dynamic work again, also may under the dynamic condition directly opening machine,and pletes the week fuzziness search solution under the dynamic environment. After end knows the number solution to be fixed, then carries on each calendar Yuan realtime processing, so long as can maintain four above satellites phases observation value the track and the essential geometric figure ,then the mobile station may produce the centimeter level localization result as necessary.The RTK technology key lies in the data processing technology and the data transmission technology, when the RTK localization requests the datum station receiver realtime the observation data (false distance observation value, phase observation value) and the know data transmission for the mobile station receive, the data quantity quite big, generally all requests 9,600 bauds rate, this in on radio is not difficult to realize.4. The application of RTK(1) Each kind of control surveyThe traditional geodetic survey, the project control survey uses the triangular net, the linenetwork method executes measured, not only requires a lot of work timeconsuming, request Indivisibility, moreover the precision distribution nonuniformity, also at the field operation did not know how the precision, does use conventional the GPS static state survey, the fast static state, the false dynamic method, survey in the process at field operation not to be able realtime to know the pointing accuracy, after if surveys pletes, after returns to house processing to discover the precision does no t gather the request, but also must return measured, but uses RTK to carryon the control survey, can realtime know the pointing accuracy, if the fruits and cakes position precision request has satisfied, the user was allowed to stop observing, how moreover knew the observation quality, This may greatly enhance the work efficiency. If uses in the road control survey RTK,electronic circuit control survey, the hydraulic engineering control survey, the geodetic survey, then not only may greatly reducethe manpower intensi ty, the economical expense, moreover greatly enhances the working efficiency,measured a control point may plete in several minutes even several seconds.(2) Terrain mappingIn the past measured when topographic diagram generally first must in measure area establishment chart root control point, then on chart root control point top carriage entire station meter or altazimuth coordination small flat panel mapping, now develops the field operation with the entire station meter and the electronic hand coordination thing code, uses big scale mapping software to carryon the mapping, even develops recent field operation electron dull mapping and so on, all requests in the survey station to measure all around terrain landform and so on department point, these points all wi th survey station indivisibility, moreover generally requests at least 23 person to operate, needs when puts together the chart once the precision not to gather the request also to obtain the field operation to return measured,when now uses RTK, only needs a person to carry the instrument in on the terrain landform department point dull 12 second kinds which must measure, and simultaneously inputs the characteristic code, through hand book may realtime know the position precision, after measured a region returns to in the room, may output the topographic diagram by the specialized software connection which requests, like this uses RTK only to need a person to operate,does not