它是如何工作的呢?是什么让它不同?

GS18 t可以比以往任何时候都更快，更方便地测量和放置点。使用GS18 t，无需在进行测量或出发时垂直平整杆。您可以从字面上忘记泡沫（#ForgetTheBubble）。遵循Q&A with Leica Geosystems GNSS Business Director Bernhard Richterabout the new product, the following interview with Application Engineer at Leica Geosystems Paul Dainty gives us deeper insights about how to use the new Leica GS18 T and how it works.

What makes the GS18 T different? How does it work?

这Leica GS18 T与市场上的任何其他产品不同，因为它不依赖磁力计来校正每个测量的杆倾斜。磁力计受到金属物体的影响，例如车辆，铁栅栏和横梁，甚至是钢筋混凝土，所有这些都经常在建筑位置上发现。为了提供准确且可靠的倾斜值，Leica GeoSystems开发了一种特定应用，功能强大且轻巧的惯性微单元（IMU），该微单元（IMU）内置在GNSS天线中。真正的 - 时间倾斜补偿将GNSS数据与IMU的倾斜和方向值结合在一起。与基于磁力计的GNSS天线不同，GS18 T的倾斜补偿不需要校准，并且不受金属对象干扰的影响。

在困难条件下的测量表现，例如城市峡谷或带有重篷的木材呢？

Like theLeica Viva GS16, the Leica GS18 T is a self-learning GNSS Smart Antenna with a high-class performance. This adaptive measurement engine with RTKplus provides measurement engineers on construction sites with the best position by automatically selecting the optimal signal combination. In addition, the GS18T is well prepared for the future. With its 555 channels, it is able to track all signals from all major GNSS systems worldwide, like Glonass, Galileo, BeiDou or QZSS (more details can be found in theGS18 T数据表）。

And how accurate are the measurements made with tilt compensation?

这accuracy depends on many factors. There is the accuracy of the GNSS position. If we look at the specified RTK solution, it is the same as with the GS16 – typically 8 mm + 1 ppm (single baseline length) Hz and 15 mm + 1 ppm (single baseline length) V. The accuracy of the tilt measurement is divided between the tilt accuracy and the direction of tilt accuracy. The tilt accuracy will typically be better than 0°12'00" and the direction of tilt accuracy typically better than 1°00'00". This means over a 1.8 metre pole length, the overall tilt accuracy is typically better than 20 mm at the pole tip with a tilt angle of 30°. This accuracy is comparable and most of the time better than using a conventional GNSS pole with a 20’ level bubble to make the pole vertical.

If the pole is tilted more than 30°, the accuracy of the tilted measurement reduces for two reasons:

1. Tilt accuracy declines as the tilt is increased and the direction of tilt accuracy has higher impact
2. With increasing the tilt angle, the antenna starts to lose track of some satellites, therefore reducing the GNSS position quality.

无论如何，位置质量指标Leica Captivate显示了GNS​​S的组合位置质量和倾斜质量，因此代表了真正的极尖端精度。

Pole tip accuracy of 0.0175 metres, shown in Leica Captivate v3.0 on the field screen.

静止不动还可以使用倾斜的杆子吗？

Yes, the tilt compensation can be used in any Captivate app where you can measure, meaning staking out is also much quicker and much more convenient than ever before. When setting out with conventional GNSS equipment, several different steps have to be done at the same time:

• Watching and interpreting the instructions on the screen
• Orienting, moving the pole according to the instructions
• 握住杆子垂直。

Holding the pole vertical, though, is no longer needed. With the GS18 T and the new迷人的v3.0，阐明是非常简化的，并且是全新的体验。使用倾斜的杆信息和传感器标题，直观的3D赌注说明现在使导航到赌注点变得更加容易。

Staking out drastically simplified: With the powerful and intuitive 3D viewer, navigating to the point is easier.

Leica Geosystems的意思是“难以到达在之前无法衡量的点”的含义？

With a conventional GNSS RTK rover, points like building corners, walls, fences, light posts or points underneath obstacles, like cars, cannot be directly measured with a vertical pole. To measure a building corner for example, you would have to measure a point nearby, and apply an offset to the point or measure it with an alternative method such as a total station – both options take time to do that reduces productivity. With the GS18 T, a building corner can be measured directly because the pole can be tilted and the pole tip placed easily and quickly to the corner. The same goes for all other difficult to reach objects, meaning the GS18 T makes measuring easier and quicker than ever before.

For a better understanding, I would recommend to watch the GS18 T how-to-video:

在建筑物旁边测量的准确性是否会受到影响？

That is a very good question and one that people have been asking. When measuring next to buildings, the amount of multipath is likely to increase and a part of the view to the sky will be obstructed by the buildings, reducing the number of visible satellites. This makes for challenging GNSS conditions. The GS18 T with RTKplus technology is self-learning, meaning the sensor will automatically use the best signals and widely mitigate the multipath signals to compute its position. As long as the sensor can track enough satellites, an RTK position will be computed and the GNSS position quality will be displayed. So, whilst the accuracy is not likely to be quite as good as when measuring with an open view of the sky, the displayed GNSS position quality can be trusted so that you always know what accuracy your measured point will have.

Where can the new Leica GS18 T be tried out?

Easily, just contact your当地的Leica Geosystems分销商and ask for a hands-on demo.

保罗·迪蒂（Paul Dainty）
Leica Geosystems的应用程序工程师