Conventional GPS measurement methods, such as static, fast static, and dynamic measurements all need to be solved afterwards to obtain centimeter-level accuracy, while RTK is a measurement method that can achieve centimeter-level positioning accuracy in real time in the field. It uses carrier-phase dynamic real-time measurement. The Real-time kinematic method is a major milestone for GPS applications. Its appearance has brought new dawnings to engineering layout, terrain mapping, and various control measurements, which has greatly improved the efficiency of field operations.
High-precision GPS measurement must adopt carrier phase observations. RTK positioning technology is a real-time dynamic positioning technology based on carrier phase observations. It can provide real-time three-dimensional positioning results of the station in a given coordinate system and achieve centimeter-level accuracy. In the RTK mode of operation, the base station transmits its observations along with the station coordinate information to the rover through the data link. The rover not only receives data from the base station through the data link, but also collects GPS observation data and makes up the differential observations in the system for real-time processing. At the same time, it gives a centimeter-level positioning result that takes less than one second. The rover can be stationary or in motion; it can be initialized at a fixed point before entering a dynamic job, or it can be turned on directly under dynamic conditions, and the search for a weekly ambiguity can be done in a dynamic environment. After the knowledge of the number of solutions is fixed over the entire weekend, real-time processing of each epoch can be performed. As long as the tracking of the phase observations of more than four satellites and the necessary geometry can be maintained, the rover can give a centimeter-level positioning result at any time.
The key to RTK technology lies in data processing technology and data transmission technology. RTK positioning requires the base station receiver to transmit observation data (pseudorange observations, phase observations) and known data to the rover receiver in real time. Large, generally require 9600 baud rate, this is not difficult to realize on the radio.
How to Apply RTK Technology 1. Various Control Measurements Traditional geodetic surveying and engineering control surveying adopts triangulation and wire mesh methods to measure, which not only takes time and labor, requires visual communication between points, and the accuracy distribution is uneven, and it is unknown in the industry. How is the accuracy, using the conventional GPS static measurement, fast static, pseudo-dynamic method, in the field setting process can not be real-time know the positioning accuracy, if the measurement is completed, back to the industry after processing found that the accuracy is not desirable, you must return to test The use of RTK to control measurements can be real-time to know the positioning accuracy, if the point accuracy requirements are met, the user can stop the observation, and know how the observation quality, which can greatly improve the operating efficiency. If the RTK is used for road control surveys, electronic circuit control surveys, hydraulic engineering control surveys, and geodetic surveys, it can not only greatly reduce labor intensity, save costs, but also greatly increase work efficiency, measuring a control point in minutes or even seconds. The clock can be completed.
2. Terrain Mapping When surveying topographic maps in the past, it is generally necessary to establish map root control points in the survey area. Then the total station or theodolite coordinates with the small plate map at the map root control point, and now it has developed to the total stations in the field. Cooperating with the electronic handbook to encode objects, using large-scale mapping software for mapping, and even developing to the latest field electronic flat-panel mapping, etc., all require measuring the topography and geomorphology of the surrounding area at the station. These parts are all inspected with the station, and generally require at least 2-3 people to operate, need to get the field to go back to the test once the accuracy is unsatisfactory in the puzzle, now when using the RTK, only one person carrying the instrument is required. The topographical features to be measured shall stay on for one or two seconds. At the same time, feature codes are input. Through the handbook, the accuracy of points can be known in real time. After a field is measured, it will be returned to the room and output by a professional software interface. The required topographic map, which requires only one person to operate with the RTK, does not require visual communication between points, greatly improving the work efficiency, using RTK with the electronic handbook can be measured in various topographic maps, such as ordinary mapping, railway line strip Laying of the chart, a line topographic map road test set, with the sounder may be used to measure reservoir topographic map, mapping marine navigational like.
3. Stakeout process Stakeout is the measurement of an application branch. It requires a certain method to use a certain instrument to manually design a good point in the field to calibrate out, in the past using a lot of conventional stakeout methods, such as theodolite rendezvous, total station side Corner lofting and so on, generally have to set a design point, usually need to move the target back and forth, but also 2-3 people to operate, while in the lofting process also requires a good look at the situation between the point of view, in the production and application efficiency is not very High, sometimes difficulties encountered in lofting can be staked out by many methods. If you use RTK technology to stake out, you only need to input the designed point coordinates into the electronic book and carry the GPS receiver. It is fast and convenient for you to go to the location where you want to stake out. Because GPS is directly set out by coordinates, and the accuracy is very high and even, the efficiency in the field setting-out will be greatly improved, and only one person is required to operate.
High-precision GPS measurement must adopt carrier phase observations. RTK positioning technology is a real-time dynamic positioning technology based on carrier phase observations. It can provide real-time three-dimensional positioning results of the station in a given coordinate system and achieve centimeter-level accuracy. In the RTK mode of operation, the base station transmits its observations along with the station coordinate information to the rover through the data link. The rover not only receives data from the base station through the data link, but also collects GPS observation data and makes up the differential observations in the system for real-time processing. At the same time, it gives a centimeter-level positioning result that takes less than one second. The rover can be stationary or in motion; it can be initialized at a fixed point before entering a dynamic job, or it can be turned on directly under dynamic conditions, and the search for a weekly ambiguity can be done in a dynamic environment. After the knowledge of the number of solutions is fixed over the entire weekend, real-time processing of each epoch can be performed. As long as the tracking of the phase observations of more than four satellites and the necessary geometry can be maintained, the rover can give a centimeter-level positioning result at any time.
The key to RTK technology lies in data processing technology and data transmission technology. RTK positioning requires the base station receiver to transmit observation data (pseudorange observations, phase observations) and known data to the rover receiver in real time. Large, generally require 9600 baud rate, this is not difficult to realize on the radio.
How to Apply RTK Technology 1. Various Control Measurements Traditional geodetic surveying and engineering control surveying adopts triangulation and wire mesh methods to measure, which not only takes time and labor, requires visual communication between points, and the accuracy distribution is uneven, and it is unknown in the industry. How is the accuracy, using the conventional GPS static measurement, fast static, pseudo-dynamic method, in the field setting process can not be real-time know the positioning accuracy, if the measurement is completed, back to the industry after processing found that the accuracy is not desirable, you must return to test The use of RTK to control measurements can be real-time to know the positioning accuracy, if the point accuracy requirements are met, the user can stop the observation, and know how the observation quality, which can greatly improve the operating efficiency. If the RTK is used for road control surveys, electronic circuit control surveys, hydraulic engineering control surveys, and geodetic surveys, it can not only greatly reduce labor intensity, save costs, but also greatly increase work efficiency, measuring a control point in minutes or even seconds. The clock can be completed.
2. Terrain Mapping When surveying topographic maps in the past, it is generally necessary to establish map root control points in the survey area. Then the total station or theodolite coordinates with the small plate map at the map root control point, and now it has developed to the total stations in the field. Cooperating with the electronic handbook to encode objects, using large-scale mapping software for mapping, and even developing to the latest field electronic flat-panel mapping, etc., all require measuring the topography and geomorphology of the surrounding area at the station. These parts are all inspected with the station, and generally require at least 2-3 people to operate, need to get the field to go back to the test once the accuracy is unsatisfactory in the puzzle, now when using the RTK, only one person carrying the instrument is required. The topographical features to be measured shall stay on for one or two seconds. At the same time, feature codes are input. Through the handbook, the accuracy of points can be known in real time. After a field is measured, it will be returned to the room and output by a professional software interface. The required topographic map, which requires only one person to operate with the RTK, does not require visual communication between points, greatly improving the work efficiency, using RTK with the electronic handbook can be measured in various topographic maps, such as ordinary mapping, railway line strip Laying of the chart, a line topographic map road test set, with the sounder may be used to measure reservoir topographic map, mapping marine navigational like.
3. Stakeout process Stakeout is the measurement of an application branch. It requires a certain method to use a certain instrument to manually design a good point in the field to calibrate out, in the past using a lot of conventional stakeout methods, such as theodolite rendezvous, total station side Corner lofting and so on, generally have to set a design point, usually need to move the target back and forth, but also 2-3 people to operate, while in the lofting process also requires a good look at the situation between the point of view, in the production and application efficiency is not very High, sometimes difficulties encountered in lofting can be staked out by many methods. If you use RTK technology to stake out, you only need to input the designed point coordinates into the electronic book and carry the GPS receiver. It is fast and convenient for you to go to the location where you want to stake out. Because GPS is directly set out by coordinates, and the accuracy is very high and even, the efficiency in the field setting-out will be greatly improved, and only one person is required to operate.