GNSS setting out, with no need to level the pole vertically?

Setting out with a GNSS antenna is a tricky task. Looking at the instructions and values on the controller screen, moving the pole to the required position, and ensuring the pole is vertical by centering the pole bubble - all at the same time - needs careful execution and is not easy, especially when time pressure is high. With the newLeica GS18 t, setting out is much more convenient and faster than ever before. In this article Paul Dainty explains more.

Surveyors and setting out engineers are no different. Pressure at work is high. There are the usual time-critical tasks to do on a typical construction site such as checking the as-built structure, or setting out earthworks or building foundations.

压力正在打开。A crew and an expensive machine are waiting.

但是有时候，现场的压力可能会变得很高。想象一下，挖掘机机器刚刚到达现场的时间比计划的要早到，并且已经准备好开始土方工程了。问题是尚未列出配置文件，这需要在土方工程开始之前进行。设置工程师是唯一可以做到这一点的人。压力正在打开。当然，他现在必须尽快将这些个人资料板列为最高的准确性，而一台非常昂贵的机器正在等待闲置，甚至不提及数十名不耐烦的工人。

Setting out with a conventional GNSS RTK rover can be slow

With a conventional GNSS RTK rover, setting out is a rather slow and methodical procedure. This is because the pole needs to be held vertically at the same time as looking at the setting out information on the controller screen all the while moving the pole into position. The GNSS position is calculated to the antenna, which is fixed onto a 1.8 m or 2 m pole. Hence, for the setting out information on the screen to be correct, the pole must be held vertically by centering the pole bubble.

To set out a position accurately, it is needed to perform several tasks at the same time:

• Look at the setting out instructions and values on the controller screen
• Walk and orientate: Move the pole to the required position so that the stake values are close to zero
• Ensure the pole is vertical by centering the pole bubble

Simplified setting out with the new Leica GS18 T. Looking at the pole bubble and holding the pole vertical (like in the image) are history.

As it is extremely difficult to do these all at the same time, it is generally preferred to follow those tasks in an iterative process:

It needs to be an iterative process because by centering the bubble to ensure the pole is vertical in step 3, we probably need to move the antenna, and need to go to step 1 again to check the setting out instructions on the screen. Then do step 2 again to adjust the pole position, and so on. To set out a position accurately enough, the process probably has to be performed two or three times, which is not particularly difficult, but it does take time to do it properly.

Now returning to our site, imagine the excavator and the crew of workers waiting for you to carefully set out the profile boards, performing the iterative setting out process on each one. The situation is likely to be very stressful and mistakes are likely to happen, slowing the process down further.

想象一下能够出发而无需执行此迭代过程。

好吧，现在可以使用Leica GS18 twith tilt compensation. The GS18 T is the first GNSS RTK rover to allow staking out with a tilted pole. Because the GS18 T combines seamlessly with theLeica Captivate在软件中的任何应用中，都有可能的现场软件，倾斜补偿测量。我们可以用倾斜的杆子来测量和赌注点，线，道路或任何需要的东西。

新的Leica GS18 T - 与所有其他GNSS传感器不同

So how does the tilt compensation work and how does it remove the need for the iterative setting out process? For the GS18 T, Leica Geosystems developed a very special IMU and a patented method of combining the IMU and GNSS data. With this new technology, it is not necessary anymore to rely on a magnetometer to calculate the tilt direction for each measurement. The GS18 T with tilt compensation is calibration free and the sensor is immune to magnetic disturbances. With its remarkable ability to use it not only for measuring but also for staking out, the GS18 T is different from all other tilt compensating GNSS sensors currently in the market.

Setting out is made much easier because the tilt compensation removes the need to center the bubble to make the pole vertical. This means that when setting out with the GS18 T, the engineer only needs to do the following two steps:

• Look at the setting out instructions and values on the controller screen
• 将杆尖移到所需位置，使损耗值接近零

直观的股份：使用GS18 t杆的位置和杆尖到桩点的距离以图形方式显示在控制器上，具有功能强大的3D查看器。

以下视频序列给人以良好的印象：

As the setting out engineer does not need to ensure the pole is vertical by centering the pole bubble any more, the process is not iterative anymore. Setting out is much more comfortable and can be done faster than ever before.

与新徕卡GS18 T设置out can be done quickly, confidently and accurately with the minimum of fuss and reduced stress. Simply get the job done on time.

Ask for a demo, if you want to try out the new GS18 T on your own.

Readers who want to get their own impression of the world’s fastest GNSS RTK rover, contact yourlocal Leica Geosystems distributorand ask for a demo. Demos are possible from November 2017 onward. The Leica Geosystems distribution network will be at your service.

Paul Dainty
Application engineer at Leica Geosystems