GEODETIC MEASURING TECHNOLOGY AND SATELLITE NAVIGATION

Geomnibus Newsroom
May 29, 2020

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With regard to geodetic measuring technology, the main thing that stood out this year at INTERGEO was how much more user friendly it has become. The accuracy and performance level of the devices them-selves haven’t changed. The offer of increasingly intuitive operating concepts for surveying equipment makes these devices more accessible to users. For example, it is no longer necessary to constantly keep GNSS antennae horizontal by monitoring a spirit level. High-end GNSS receivers are also clearly becoming more user-friendly. What’s more, devices are on offer that can support 864 channels and display the signals they receive as an interference spectrogram. Although this doesn’t increase the absolute positioning accuracy, it makes the signals far more robust and means they can be analyzed in detail even during the measuring process. The current all-in-one stations continue to move more closely towards the user interfaces commonly found on smartphones and tablets. Functions can be arranged on, added to and removed from the touchscreen as apps, however users wish. Another development is the increasing support offered by augmented reality (AR) for inspections of building sites or low-scale mass calculations (See also: “3D GIS, virtual 3D city models, 3D visualization”).

AR can also be used to display the plot boundaries or cable and pipe routes in buildings’ walls on a site. For example, for construction work on an existing building, a device is already on the market that uses a mobile radar system to scan and represent cables, pipes and reinforcements in AR. Various developments were apparent in global satellite navigation systems (GNSS). In September this year, Galileo chalked up one billion receiver chips installed in smartphones. This milestone in European GNSS highlights how widespread Galileo tech higher, as systems such as the eCall automatic emergency alert also use this service. Using Galileo as an additional GNSS and dual-phase receiver chips in smartphones achieves an accuracy of positioning within decimeters. This development confirms that, among the GNSS services on offer, Galileo has now established itself as a standard in mobile applications. Having said that, in July this year, Galileo completely broke down for six days, when a simultaneous update at both control stations caused a chain reaction of serious errors. To avoid similar mishaps in the future and increase long-term stability, additional control mechanisms have been introduced together with a control commission. Galileo is due to go into full operation at the end of 2020, with 26 satellites currently in orbit, of which 22 are in service. In addition, a high-accuracy service is in the pipeline that, during the next few years, will be available worldwide free of charge and provide accuracy to within 20 centimeters.

The SAPOS correction data service is developing in the direction of PPP (precise point positioning) as the only viable means of meeting the foreseeable high number of users in agriculture and autonomous driving. Some services are already available for free, while the plan is to release the entire application portfolio free of charge going forward. The accuracy of the standard services EPS and HEPS is unlikely to prove beatable in the future. technology is becoming in end devices, bearing in mind that the total number of users is even

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