Precautions and tips for using RTK

One. Reference station requirements.

The point selection of the reference station must be strict. Because every time the satellite signal of the reference station receiver is locked, it will affect the normal operation of all rover stations in the network.

1．.The surrounding field of vision should be wide, the cut-off height angle should be more than 15 degrees, and there should be no signal reflectors (large areas of water, large buildings, etc.) around to reduce multipath interference. And try to avoid traffic arteries and the interference of passing pedestrians.

2. The reference station should be set up at the relative commanding height as far as possible to facilitate the broadcast of differential correction signals.

3. The reference station should be 200 meters away from large electromagnetic emission sources such as microwave towers and communication towers, and 50 meters away from high-voltage transmission lines and communication lines.

4 During RTK operation, the reference station is not allowed to be moved or shut down and restarted, and must be recalibrated after restarting.

5. The connection of the reference station must be correct, and pay attention to the positive and negative poles (red, positive, black and negative) of the virtual battery

6 After the reference station host is turned on, it is necessary to wait for the differential signal to be transmitted normally before leaving the reference station, S82 shows that the DL indicator flashes 2 times every 5 seconds, and S86 shows that the RX indicator flashes 2 times every 5 seconds

2. Rover requirements.

1 Before RTK operation, you should first check whether the memory capacity of the instrument can meet the needs of the work, and prepare sufficient power supply.

2 After turning on Project Star, first make sure that the handbook is connected to the host Bluetooth.

3. In order to ensure the high accuracy of RTK, it is best to have more than three known points of plane coordinates for correction, and the accuracy of the points should be equal, and should be evenly distributed around the survey area, and the accuracy of the conversion parameters should be evaluated by using the error in the coordinate conversion. If you use a two-point correction, you must pay attention to whether the scale ratio is close to 1

4. Since the rover generally adopts the default 2m mobile pole operation, when the height is different, this value should be corrected.

5. At the point where the signal is affected, in order to improve efficiency, the instrument can be moved to an open place or the antenna can be raised, and after the data link is locked to be fixed, it can be carefully moved back to the point to be fixed or the antenna can be lowered without inclination, and the initialization can generally be successful.

1. The base station is erected in a sufficiently open place.

2. If the signal cannot be fixed for a long time at the corner of the building, do not measure the ......The satellite signal is blocked.

3. Same as above, ...... under a dense tree

4. Don't blindly believe in Russia's "GLONASS".

5. Don't wait for "Galileo" stupidly, it's better to wait for "Galileo" than to look forward to "Beidou".

6. Ensure that the battery has a ......

7. Ensure that some lines are connected to ......

8. Ensure that the machine is turned on (the above three things are the mistakes I have made) 9. Although it is waterproof, it is not necessarily lightning protection, so don't do it when it rains, and call it a day ......

If the signal is unstable, do not store

Because the signal is unstable, it is possible that the stored solution is not fixed.

1.To determine the mode of erecting the base station, two ways are generally adopted now, and the foreign ones are more rigorous, when the erection is at a known point.

2.That is, the RTK is placed on a known control point or any unknown point, regardless of the brand, if you pre-convert it.

1.First, determine the coordinate system of the project, such as the coordinate system, the meridian, etc., generally BJ54, Xi'an80 and independent coordinate systems.

2.To determine the mode of setting up the base station, two square slide lead types are generally used, that is, on the known control point or any unknown point, of course, the operating procedures of the two modes are different.

The base station does not need to be connected Operation 2, egstar (engineering star 1, click: configuration 1, port settings The port is changed to the selected string slogan com7 (default) baud rate 115200 instrument class when connecting to the mobile station Bluetooth.

I haven't used this before, you can use it, and I'll tell you next time, thank you.

If you buy Suzhou Yiguang's RTK, I can give you how to use it, if you don't buy it, you can consider Suzhou Yiguang's RTK ** and performance are not good, add me and send you a copy of the information.

Summary. First, determine the coordinate system of the project, such as the coordinate system, **meridian, etc., generally bj54, xi'an80 and independent coordinate systems.

2: determine the mode of erecting the base station, generally now adopt two ways, that is, on the known control point or any unknown point, of course, the operating procedures of these two modes are not the same, when the erection is on the known point, if you have solved the conversion parameters in advance, then you can directly collect data or lofting, if not, you must collect geodetic coordinates at multiple known points to find the conversion parameters, of course, you can also carry out any of the following station mode.

When arbitrarily erecting a base station, as long as you check the known control points, or even as long as 1 on the line, the general domestic RTK likes to use this mode, the foreign ones are more rigorous, and generally must be erected on the known control points, and no less than 3 local coordinates, and WGS84 coordinates to find the conversion parameters. . .

3: Set up the base station, after the rover is checked, you can collect data or stakeout.

How to use RTK.

Shou Xun first determine the coordinate system of the project, such as the coordinate system, **meridian, etc., generally BJ54, xi'an80 and independent coordinate system 2: to determine the mode of erecting the base station, generally now use two ways, that is, on the known control point or any unknown point, of course, the operating procedures of these two modes are not the same, when the frame is on the known point, if you have solved the conversion parameters in advance, then you can directly collect data or stakeout, if not, It is necessary to collect geodetic coordinates on a number of known points to find the conversion parameters, of course, it can also be carried out according to the following arbitrary erection station mode, when any base station is erected, as long as the core of the calibration is carried out on the known control point, or even as long as 1 on the line, the general domestic RTK likes to use this mode, the foreign one is more rigorous, and generally must be erected on the known control point, and there are no less than 3 local coordinates, and wgs84 coordinates to find the conversion parameters. . . 3：

After setting up the base station and checking the rover, you can collect data or stake out.

How to measure the pile distance without coordinates.

In the setting interface, the distance between two points is measured, and it is automatically calculated after aligning the two points respectively.

The differential method of processing the carrier phase observations of the two measuring stations in real time, and the carrier phase collected by the base station is sent to the user receiver for differential coordinates. This is a new commonly used measurement method for satellite car splitting and renting, which requires post-mortem calculation to obtain centimeter-level accuracy, while RTK is a measurement method that can obtain centimeter-level positioning accuracy in real time in the field. It adopts the carrier phase dynamic real-time difference method, which is a major milestone in the application of GPS, and its emergence has brought new measurement principles and methods to engineering lofting, topographic mapping, and various control surveys, which has greatly improved the operation efficiency.