The surveying under the forest cover,water level and the ground and above special construction(e.g.the steel-making furnace)have become a new project in the agriculture,industry and environment monitoring.It should be...The surveying under the forest cover,water level and the ground and above special construction(e.g.the steel-making furnace)have become a new project in the agriculture,industry and environment monitoring.It should be based on the digital and precision surveying,the 3S(GPS,RS and GIS)technology will be applied to the locating of special site and establishing of surveying information system.The primary theory has been proved and tested in this paper.By the means of the field data,the application of 3S technology has embodied some advantages,such as the characteristic of real-time and high-precision.展开更多
As one of the most effective methods for magnetite exploration, high-precision magnetic survey has always played an important role in finding the location and distribution of deep buried magnetite, which can directly ...As one of the most effective methods for magnetite exploration, high-precision magnetic survey has always played an important role in finding the location and distribution of deep buried magnetite, which can directly reflect the magnetic anomaly characteristics of magnetic iron deposits. In this paper, a high-precision magnetic survey was carried out in a work area in southern Shaanxi with a magnetic network of 100× 20m. Combined with geological data and through data processing and analysis and interpretation, the distribution, scale and spatial distribution of concealed and semi-concealed magnetic ore bodies related to mineralization in the work area were basically identified, and the general scope and location of magnetic anomalies in the work area were circled, providing a basis for scientific and reasonable development of magnetite in the area.展开更多
The loess plateau is featured by a sharply undulated and remarkably incised surface. The sharp surface undulation means great variation of loess thickness. Since the loess layer exhibits significant density contrast w...The loess plateau is featured by a sharply undulated and remarkably incised surface. The sharp surface undulation means great variation of loess thickness. Since the loess layer exhibits significant density contrast with the underlying formation, a high frequency gravity anomaly with a certain magnitude will appear. The high frequency gravity anomaly can result in some difficulties for processing and interpreting the gravity data, thereby reducing the usefulness of gravity surveys in loess plateau areas. We carried out a high precision gravity survey in the SHJZ structural zone. During data processing, we applied terrain and loess corrections to effectively remove or suppress the gravity effect resulting from surface undulation and variation of loess thickness. We obtained high precision gravity data which matches well with other geophysical data. The comprehensive interpretation based on the final gravity data help to study local structure integrated with other published geophysical data.展开更多
In order to research the possibility of digital close-range photogrammetric surveying in small scale physical simulation experiment,physical model coinciding with engineering practice was constructed based on similar ...In order to research the possibility of digital close-range photogrammetric surveying in small scale physical simulation experiment,physical model coinciding with engineering practice was constructed based on similar theory.The datum processing method and surveying precision of digital close-range photogrammetric were analyzed.And the function relationship between overburden subsidence factor qr and the ratio z/H of stratum horizon z and mining depth H was researched.The results show that surveying points position mean error along horizontal direction is±0.131 mm and vertical direction is±0.192 mm.Therefore,multi-taking station cross direction digital close-range photogrammetric can completely satisfy the precision need of physical simulation experiment.And the empirical formula can be utilized to represent evolution law of stratum subsidence factor.展开更多
An aided Inertial Navigation System(INS)is increasingly exploited in precise engineering surveying,such as railway track irregularity measurement,where a high relative measurement accuracy rather than absolute accurac...An aided Inertial Navigation System(INS)is increasingly exploited in precise engineering surveying,such as railway track irregularity measurement,where a high relative measurement accuracy rather than absolute accuracy is emphasized.However,how to evaluate the relative measurement accuracy of the aided INS has rarely been studied.We address this problem with a semi-analytical method to analyze the relative measurement error propagation of the Global Navigation Satellite System(GNSS)and INS integrated system,specifically for the railway track irregularity measurement application.The GNSS/INS integration in this application is simplified as a linear time-invariant stochastic system driven only by white Gaussian noise,and an analytical solution for the navigation errors in the Laplace domain is obtained by analyzing the resulting steady-state Kalman filter.Then,a time series of the error is obtained through a subsequent Monte Carlo simulation based on the derived error propagation model.The proposed analysis method is then validated through data simulation and field tests.The results indicate that a 1 mm accuracy in measuring the track irregularity is achievable for the GNSS/INS integrated system.Meanwhile,the influences of the dominant inertial sensor errors on the final measurement accuracy are analyzed quantitatively and discussed comprehensively.展开更多
基金Project(2001 AA24503)supported by the National High-Tech Research Programof ChinaProject(30070619)supported by the National Natural Science Foundation of China.
文摘The surveying under the forest cover,water level and the ground and above special construction(e.g.the steel-making furnace)have become a new project in the agriculture,industry and environment monitoring.It should be based on the digital and precision surveying,the 3S(GPS,RS and GIS)technology will be applied to the locating of special site and establishing of surveying information system.The primary theory has been proved and tested in this paper.By the means of the field data,the application of 3S technology has embodied some advantages,such as the characteristic of real-time and high-precision.
文摘As one of the most effective methods for magnetite exploration, high-precision magnetic survey has always played an important role in finding the location and distribution of deep buried magnetite, which can directly reflect the magnetic anomaly characteristics of magnetic iron deposits. In this paper, a high-precision magnetic survey was carried out in a work area in southern Shaanxi with a magnetic network of 100× 20m. Combined with geological data and through data processing and analysis and interpretation, the distribution, scale and spatial distribution of concealed and semi-concealed magnetic ore bodies related to mineralization in the work area were basically identified, and the general scope and location of magnetic anomalies in the work area were circled, providing a basis for scientific and reasonable development of magnetite in the area.
文摘The loess plateau is featured by a sharply undulated and remarkably incised surface. The sharp surface undulation means great variation of loess thickness. Since the loess layer exhibits significant density contrast with the underlying formation, a high frequency gravity anomaly with a certain magnitude will appear. The high frequency gravity anomaly can result in some difficulties for processing and interpreting the gravity data, thereby reducing the usefulness of gravity surveys in loess plateau areas. We carried out a high precision gravity survey in the SHJZ structural zone. During data processing, we applied terrain and loess corrections to effectively remove or suppress the gravity effect resulting from surface undulation and variation of loess thickness. We obtained high precision gravity data which matches well with other geophysical data. The comprehensive interpretation based on the final gravity data help to study local structure integrated with other published geophysical data.
基金Projects(41101520,41071328,51074064)supported by the National Natural Science Foundation of China
文摘In order to research the possibility of digital close-range photogrammetric surveying in small scale physical simulation experiment,physical model coinciding with engineering practice was constructed based on similar theory.The datum processing method and surveying precision of digital close-range photogrammetric were analyzed.And the function relationship between overburden subsidence factor qr and the ratio z/H of stratum horizon z and mining depth H was researched.The results show that surveying points position mean error along horizontal direction is±0.131 mm and vertical direction is±0.192 mm.Therefore,multi-taking station cross direction digital close-range photogrammetric can completely satisfy the precision need of physical simulation experiment.And the empirical formula can be utilized to represent evolution law of stratum subsidence factor.
基金the National Natural Science Foundation of China(41904019).
文摘An aided Inertial Navigation System(INS)is increasingly exploited in precise engineering surveying,such as railway track irregularity measurement,where a high relative measurement accuracy rather than absolute accuracy is emphasized.However,how to evaluate the relative measurement accuracy of the aided INS has rarely been studied.We address this problem with a semi-analytical method to analyze the relative measurement error propagation of the Global Navigation Satellite System(GNSS)and INS integrated system,specifically for the railway track irregularity measurement application.The GNSS/INS integration in this application is simplified as a linear time-invariant stochastic system driven only by white Gaussian noise,and an analytical solution for the navigation errors in the Laplace domain is obtained by analyzing the resulting steady-state Kalman filter.Then,a time series of the error is obtained through a subsequent Monte Carlo simulation based on the derived error propagation model.The proposed analysis method is then validated through data simulation and field tests.The results indicate that a 1 mm accuracy in measuring the track irregularity is achievable for the GNSS/INS integrated system.Meanwhile,the influences of the dominant inertial sensor errors on the final measurement accuracy are analyzed quantitatively and discussed comprehensively.
