Research On The Application Of Regional Positioning System In Engineering Survey Field

With the development of science and technology,the measurement accuracy and efficiency requirements are getting higher and higher in surveying and mapping field.Meanwhile,in various disciplines the development of basic theories and instruments has also been quite mature.At present,engineering survey mainly relies on GPS(Global Positioning System),total station and theodolite and other traditional instruments.Admitting that these instruments and methods can basically satisfy the actual needs of the project at this stage,but there isn’t yet one instrument which can completely achieve real-time、dynamic、parallel and high-precision measurements.Considering that the system of i GPS(indoor GPS)、w GPS(workspace Measuring & Positioning System)and so on in the field of commercial measurement can realize real-time dynamic high-precision measurement of small area,if we can introduce these instruments and measurement methods to the field of engineering measurement,this problem can be primely solved to some extent.The fusion of these two disciplines is a practical issue that needs to be urgently solved and meanwhile possesses a good application prospect and social significance.In this paper,we combine the workspace measurement and positioning system which is developed by the State Key Laboratory of Measurement and Control,Tianjin University.This paper introduces the working principle and research status of the system,analyzes the key and difficult points 、the sources of error and so on during introducing this system into engineering surveying field,unite the total station to propose a new calibration method and achieve certain gain by means of experimental verification and numerical modeling.The main contents and results are as follows:1.This paper introduces the positioning principle of wMPS measurement system and the feasibility of the system in engineering measurement field.The result is found that the benchmarking method is no longer suitable.It is necessary to find a new method of self-localization for engineering measurement.Through theoretical derivation and experimental study,it is found that the self-localization method which is based on control points can commendably satisfy the requirements of engineering survey in precision and at the same time has certain practical significance;2.In this paper,the sources of error of which combines total station with regional positioning system for system positioning are analyzed,and the corresponding measures to reduce the error are taken.The self-localization method based on control points and the iterative initial value method are derived,while getting through experimental research discuss the regularities of distribution of error which utilizes dual station system to conduct spatial orientation.3.Take into account that at this stage the precise leveling of the instrument technically can not achieve,so in theory we can compare to the differences of calibration method of launch station before and after the leveling calibration.And getting through numerical modeling,we can discuss the regularities of distribution of space error of two-station system after instrument leveling.Namely,the position error is related to the distance of the connected wire that the point is away from the dual-emission station,in which the error decreases first and then increases with the increase of the distance in the plane and is minimum in the intersection of two-station intersection angle of 90°.And the error is also corresponding increased with the increase of elevation in the space elevation direction,which has certain guiding significance.;4.In this paper,the technical problems need to be desperately solved by introducing the regional localization system into the field of engineering surveying,which include light source、calibration method、instrument leveling and so on.And that gives the corresponding solution theoretically.