A simple processing method of precise relative positioning data by means of GPS(Global Positioning System).
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概要
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A simple computer program to process precise relative positioning data by means of Global Positioning System (GPS) was made and tested applying to both simulation and actual data. Simulation data were made from theoretically calculated phases by adding random numbers as measurement errors, under an actual configuration of satellites. In this case, errors of the solution became several times larger than those expected from the measurement errors assumed. It is concluded that observation equations are ill-condi-tioned because the present configuration of satellites is poor. By the results from various experiments, an extension of measurement duration is expected to be most effective for obtaining a precise geodetic solution. On the other hand, actual data were obtained by means of PRESTAR, a GPS receiver. It was found that the data included a drift-like variation of a clock difference, and this required adding a new unknown parameter. However, it was almost impossible to simultaneously estimate all the unknown parameters. An expected result was obtained by reducing the number of parameters to be estimated simultaneously, though there still remain systematic errors. Since these errors are considered due to errors of the clock variation from its linear approximation, a measurement duration should be as short as possible for the variation to become linear. From the results obtained by both simulation and actual data, we propose the following measurement method for more precise relative positioning. Several measurements should be repeated at fit intervals, while each measurement should be as short as possible. By this procedure, all the unknown parameters will simultaneously be estimated.
- 日本測地学会の論文
日本測地学会 | 論文
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