Research And Implementation On Key Technologies Of Rapid Mapping Base On Aviation-Terrestrial Integrated Survey

The national economic construction is inseparable from the support of medium and large scale topographical map. With the rapid development of the new rural construction and the new urbanization, the contradiction of using map is more and more prominent caused by the various topographic maps product demand rapid expansion. At present, topographic map products mainly comes from satellite remote sensing, the traditional aerial photography, the new low-altitude remote sensing and conventional digital mapping and other technical means.However every tool has its limitations in application,it is difficult to meet the actual demand of medium and large scale base maps. For this purposes,this paper proposes the rapid mapping theory and method of aviation-terrestrial integration, and the study of the key technology of system integration and software development. The main contents and the achievements of the paper are as follows:(1)Build system framework and business processes in rapid mapping by aviation-terrestrial surveying integration.Architecture and the overall framework of rapid mapping by aviation-terrestrial surveying integration are researched in this paper from theory and technique two aspects, sort out the key technologies and integrated direction of system integration. On the basis of the overall design and subsystem design of system integration, develop clear goals for the system integration development. Aimed at the respective characteristics of UAV aerial mapping and ground GPS/TS/FOG mapping, a new business process diagram is also proposed for the aviation-terrestrial integration fast mapping in this paper.(2) Research and test using the Light small airborne POS auxiliary aerial triangulation technique.Based on the feature of light UAV platform,the experimental studies of DGPS and DGPS/IMU technology auxiliary has been tested in the aerial drones mapping.Proposed the solutions based on the integration of ultra-light cameras,provide technical support for the 1:500 scale mapping in the domestic. The test showed that:simple DGPS auxiliary aerial triangulation, can largely improve solver accuracy, but still cannot alternative the full-field distribution points. For this proposed the program based on the integration of ultra-light camera integrated POS design, the test showed:"A7R+AP15" are the most optimal combination of solutions at present, effectively solved the shortage of DGPS auxiliary aerial triangulation, significantly increased the accuracy and efficiency of mapping.(3) Research of UAV image efficient compression and quickly display technology.Fast wavelet transform method and embedded zero tree wavelet method (EZW) algorithm and adaptive arithmetic coding algorithm were researched in image data compression techniques based on wavelet transform. Fast display policy of block compression and dynamic import based on images was put forward. Desktop TIFF image map compression software was developed in the paper. Tests show that, the software can accord setting compression ratio to meet the different large-capacity image processing under the different compression rates, display efficiency of 6×6 block data is the highest. Display speed of 3GB image compression in the embedded platform is up to the second level, compression capacity increased 9-fold.(4) Ground GPS/TS combined positioning algorithm and precision analysis.For problems of complex environments and ground positioning GPS signal blind severely affected mapping, GPS/TS combined positioning conception based on GPRS network was proposed. On the basis of analysis of RTK positioning under the situation of GPS differential in one single station, and RTK positioning under the situation of difference network, and non-differential PPP models. Feasibility and practicality of resection algorithm and coordinate transformation algorithm in free station model were explored from theory, the most favorable point of intersection graph was proved from precision analysis. Calculated examples draw the consistent results with theoretical analysis.(5) Algorithms and experimental analysis of total station FOG assisted self-directed.In order to expand the total station orientation function, core algorithm of FOG four position north find and true azimuth and coordinate azimuth conversion based on information of total station with high precision indexing was researched in the paper. FOG north finder error suppression and mathematical model of automatic compensation for installation errors in TS-assisted situation was deduced. Numerical simulation and experimental tests show that, on one hand, for fiber optic gyroscope whose accuracy is 0.02°/h, single location North finder time over 60s, its directional accuracy has been increased less obviously. On the other hand, four position North finder accuracy better than 30 seconds, open up a new direction for gyroscopes used in everyday terrain cadastral mapping.