Using PPP Corrections in Precise Real-time Applications

Minding the Gaps
Satellite-delivered GNSS correction services can be used in many real-time applications where real-time kinematic (RTK) and virtual reference stations (VRS) are not available. In areas without regular communication systems, satellite-broadcast PPP corrections can deliver centimetre-level positioning worldwide in real time. While geospatial professionals who use RTK and VRS enjoy reliable, cost-effective performance in a broad array of tasks, there are many instances where conditions conspire to make working in real time difficult or even impossible. For example, hilly terrain may block radio signals from an RTK base station, while inconsistent cellular coverage can disrupt or cut off communications with the... (read more)
2019-11-13 02:48:36

GNSS Receivers – Evolution or Revolution?

Past, Present and Future of Positioning
Satellite surveying… are there any industry professionals out there not using it on (almost) a daily basis? Over the last 30 years, GNSS has become the main positioning instrument for most applications, writes Huibert-Jan Lekkerkerk. Of course, there are still some exceptions where correct (relative) positioning is needed and dedicated optical systems such as a total station or level instrument are used, but even these are often set up over control points determined using GNSS techniques. This article investigates the developments in GNSS over the last decade and attempts to predict the future. Around a decade ago, a review of... (read more)
2019-01-30 08:43:20

ESA Leads Drive into 5G Positioning Future

A pair of testbed vehicles went out on the road in Germany to simulate the way we are all likely to be using 5G positioning services in the future. The field test focused on assessing the performance of highly precise ‘hybrid’ satellite/terrestrial positioning for autonomous vehicles, drones, smart cities and the Internet of Things. The two vehicles were driven for a week around Munich and the surrounding area in a variety of environments, from the open-sky terrain surrounding the German Aerospace Center DLR’s site in Oberpfaffenhofen to the deep urban canyons of the city’s dense Maxverstadt district. As they drove... (read more)
2019-10-03 09:30:38

Updating the Cadastre in Ecuador

Using Photogrammetry and Lidar Data
The integration of photogrammetry and Lidar can generate synergies and economic savings. The two techniques were used together to detect irrigation and drainage canals for a project aiming to improve irrigation methods and create the related land registry in the province of El Oro in Ecuador. For over 60 years, the decentralised provincial government in El Oro, Ecuador, has been committed to the agro-productive development of the province. As part of this, it has promoted the construction, management and maintenance of a network of irrigation and drainage canals, thus supporting investments in the agro-productive sectors. To improve the efficiency of... (read more)
2019-09-12 09:32:35

With or Without You? – Analysis of a Galileo Outage

“On Tuesday, 18 July 2019, technical weather is forecast as I get into my car on my way to an important GNSS verification test. Yesterday I received a short e-mail from the local reseller, informing me that Galileo is off air. Should the verification go ahead or not?” In this new column for ‘GIM International’, Huibert-Jan Lekkerkerk reflects on the two main lessons he learned during the recent Galileo outage. Part of the purpose of the verification test was to validate the manufacturer’s claims about the receiver by using the associated PPP correction service from a different supplier. Because most... (read more)
2019-07-31 12:09:26

Galileo Satellites Down Since Friday 12 July

The European navigation system Galileo is suffering a major outage. The satellite network has been largely down since Friday 12 July due to a technical incident related to its ground infrastructure, as the EU agency GSA reports. The incident has led to temporary interruption of the Galileo initial navigation and timing services, with the exception of the Galileo Search and Rescue (SAR) service. The SAR service - used for locating and helping people in distress situations (e.g. at sea or in the mountains) - is unaffected and remains operational. Due to the problems, all receivers are not able to pick... (read more)
2019-07-15 08:59:06

Trimble Launches TDC600 Smartphone and GIS Data Collector

Trimble has introduced the Trimble TDC600 handheld, an ultra-rugged, all-in-one smartphone and GNSS data collector for GIS and field inspection applications. The next-generation smartphone data collector boasts an Android 8.0 operating system, bright sunlight-readable 6-inch display, powerful 2.2GHz processor, 4GB memory and an enhanced-capacity, all-day battery. Built for geographic information system (GIS) users in organizations across a variety of industries, including environmental management, utilities and government agencies, the TDC600 handheld is a very suitable tool for communicating between the field and office. With Wi-Fi, Bluetooth 4.1 and 4G LTE cellular connectivity that supports data and voice calls, field workers are... (read more)
2019-05-22 08:58:39

Emlid Lauches Affordable Multi-band RTK GNSS Receiver

Emlid, the creators of Reach, a centimetre-accurate RTK GNSS receiver, recently launched their multi-band GNSS receiver Reach RS2. The new receiver features built-in LoRa radio, 3.5G modem and a survey app for iOS and Android. The Reach RS2 gets fixed solution in seconds and provides positional accuracy down to several millimeters. The receiver tracks GPS/QZSS (L1, L2), GLONASS (L1, L2), BeiDou (B1, B2), Galileo (E1, E5), and SBAS (L1C/A) and reliably works in RTK mode on distances up to 60 km, and 100km in PPK mode. Multi-feed antenna with multipath rejection offers robust performance, also in challenging conditions. RINEX raw... (read more)
2019-03-29 11:43:50

13th International Navigation Forum 2019 – The Art of Navigation in a Digital World

The 13th International Navigation Forum will open its doors to recognized world-class experts in the field of navigation technologies at Expocentre Fairgrounds in Krasnaya Presnya, Moscow, Russia, from 23-24 April 2019. The event will be held in conjunction with the NAVITECH Exhibition as part of the Russian Week of High Technologies. Up to 1,000 delegates from 500 companies throughout the world are expected to attend. With the emergence of new challenges, new demands for navigation service users, and the growing demand on digital technologies for connected and unmanned transport among mass consumers, navigation has become more than just a set... (read more)
2019-03-14 11:57:06

China Announces Worldwide Coverage by BeiDou

At the end of 2018, China’s Satellite Navigation Office announced that the country’s GNSS (called BeiDou or ‘BDS’) is now available as a global service. Originally, worldwide coverage was not expected to be achieved until 2020, but this early completion of the system means that China now joins the USA’s GPS, Europe’s Galileo and Russia’s GLONASS as the only four global providers of satellite-based positioning, navigation and timing (PNT) services. Ran Chengqi, director general of the China Satellite Navigation Office, is quoted as saying that BeiDou has “officially entered the global era as [it] expands from a regional system to... (read more)
2019-01-16 10:53:57
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