| Astro-geodetic surveying is a technology which requires the observer's steady performance on operating equipments. As a result a lot of daily training is necessary for mastering this technique. However, the current astro-geodetic surveying training mode mainly depends on observtion of the real sky, which is gravely restricted by weather conditions. Moreover observers can only observe the local sky in one site and restricted by regional conditions. This has seriously reduced training efficiency and effectiveness. In this dissertation a scheme of indoor simulation for astro-geodetic surveying is put forward. Firstly, the equiangular sky simulation technology is investigated which realzing true starry simulation, and the accuracy of simulation sky map is analyzed through actual measurement. Secondly, the time synchronization technology and system calibration method are studied, of which goals are reached and corresponding accuracy is analyzed. Finally, the astro-geodetic surveying indoor simulation system is integrated with the astro-geodetic surveying system, which is based on Leica TM 5100A electronic theodolite, and the accuracy of the system is analyzed through actual measurement. The high cost-effective indoor astro-geodetic surveying training is made ture regardless of the weather and the region. Main points of the dissertation and results of the research are as followed:(1) The time systems, coordinate systems relevant to astro-geodetic surveying are introduced, as well as their respective conversion relations. And the calculation steps of the star position and practical calculation method are described.(2) A new scheme for indoor simulalation of astro-geodetic surveying is put forward based on elaborate research, enabling all-weather, full-geographic and cost-effective astro-geodetic surveying training indoor.(3) The computer's internal high-precision time is extracted, which used for astro-geodetic indoor simulation surveying system timing, and the system time synchronization is realized through the serial port. And the impact of serial delay on time synchronization is researched, as well as the analysis of the precision of time comparison and time extrapolation.(4) The theory and method of dynamic equiangular star map simulation ,which based on Horizon coordinate system, is proposed, and all the formulas are deduced. After that ,a software of dynamic equiangular star map simulation is programed, achieving the simulation of dynamic equiangular star map of any time and any place.(5) The method of star searching in round field of view is improved, which is used for selected stars. Using the improved method, there is no necessary to recalculate the position of all stars when the sky zoom change, improving the speed of selecting stars effectively. (6) A method named quasi-resection method is proposed for calibrate the astro-geodetic surveying indoor simulation system. This method make it easy to determine the location of the observation instruments and the leveling gesture of the LCD screen through measuring five known coordinates landmarks on the screen.(7) The astro-geodetic surveying indoor simulation system, which is based on the reasearch of the dissertation is introduced, and the accuracy of system is analyzed through actual measurement. |
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