The Aided Program Design Of TGO

With the continuous development and spread of global positioning system and the improvement of GPS measurement technology, GPS positioning technology has been widely used in control measurement, deformation monitoring, precision engineering surveying and aerial photogrammetry and remote sensing fields now, particularly in the measure of control network. On accuracy, time, or from the economic point of view, Photo control point connection surveyed by GPS technology is superior than the conventional measurements, so GPS technology is worth promoting the application in small and medium scale Aerial Photogrammetry. TGO (Trimble Geomatics Office) is a business software for GPS static and dynamic measurement data processing which is developed by the Trimble Navigation Ltd. of USA. It is a adjustment software with powerful function, friendly interface, high automation, easy operation, multiple baseline approach, and the high quality of baseline solution; and also is a data processing software of the Photo Control Survey, widely used in China. But there are some differences with specification and the custom of measurement of China.Take advantage of the exchange data files of TGO, we can extract baseline information and redundant baseline, and then calculate the difference between duplicate baseline length. Extracting the closed loop information of GPS network from the TGO Loop Closure report, we can distinguish simultaneous loop and independent loop through baseline time contained in the data exchange file; Then according to Loop Closure calculated by component of volume coordinate and limited difference required Technical Criterion, we can examine and generate data archiving. In the unconstrained adjustment, the data exchange files stored the high-precision GPS geoid height, then can use the known points to fit the height and generate reports.As the details of the project test by TGO is inconsistent with China's criterion, this paper raises solution in line with our GPS measurement standards, and combined with EXCEL and WORD, relevant program is compiled by VB language. The solution realizes baseline quality checking and output reporting; and tests the repeated baseline according to specifications. The same time, simultaneous loop and independent loop are extracted; and according to the specification limited difference, accuracy evaluation on the closed loop is achieved; then closed loop reporting outputs. Finally, taking GPS height fitting model as the theoretical basis, GPS geoid height can tansfer to normal height.By using TGO software and this program, data processing about a GPS control network is done and compared with different software, which shows that the procedure can be applied to engineering practice, and obtained good results in the photo control survey projects of Daying county. The application of TGO aided program not only reduce manual intervention and ensure the reliability of the baseline quality inspection, but also eliminate the trouble of generate a baseline report manually; The same time, the inherent defects of TGO that can not distinguish between simultaneous loop and independent loop and can not judge closed loop in accordance with our standard is be solved. And as supporting variety of fitting model, the aided program has good supplement to the TGO software on GPS height fitting.Due to the details of baseline quality checking (repeat baseline check, simultaneous loop and independent loop check) and content and format of report does not meet the requirements of our GPS surveying, and the elevation change issues, the TGO software brings to the number of inconvenience. Author design the TGO aided program which solves the practical problems.