Tag: GNSS reference station

  • Onocoy’s Loop Back gives reference station operators RTK corrections for their devices

    Onocoy’s Loop Back gives reference station operators RTK corrections for their devices

    New feature eliminates the need for a self-hosted NTRIP caster and delivers enterprise-grade correction data to up to three devices simultaneously at no additional cost to the operator

    Onocoy, a decentralized GNSS reference station network, is launching Loop Back, a new platform feature that routes quality-assured RTK correction data back to each station operator’s own devices free of charge. More than 7,800 active reference stations contribute to the onocoy network.

    Operators who also needed precision positioning for their own drones, survey rovers, precision agriculture equipment, or autonomous machinery face a common friction point: the reference station they owned and operated produces valuable correction data, but routing that data back to their own field equipment requires either a separately maintained NTRIP caster or an additional subscription. Loop Back eliminates both.

    Loop Back is immediately available to all onocoy station operators as a standard platform feature. Full documentation and setup guides are available at docs.onocoy.com.

    How Loop Back works

    When a GNSS reference station is connected to onocoy, raw observation data flows from the operator’s hardware into onocoy’s quality validation pipeline. The platform continuously checks position stability, multi-constellation health (GPS, GLONASS, Galileo, BeiDou), uptime and other parameters before producing a quality-assured RTCM 3 correction stream.

    That validated stream has two destinations simultaneously: enterprise data clients who purchase GNSS reference station data through onocoy’s pay-per-use model, and the station operator’s own devices via Loop Back. The operator receives the same production-grade correction stream used by commercial clients, free of charge and with no data credits consumed.

    Key capabilities at launch:

    • Up to three simultaneous active connections from an operator’s own devices to their own station’s corrections, with unlimited devices configurable
    • Compatible with any NTRIP-capable station regardless of hardware brand or model
    • Quality monitoring identical to that applied to enterprise client streams
    • No separate NTRIP caster required; onocoy manages the infrastructure
    • Free of charge: No data credits consumed for the operator’s own station data.

    Who benefits

    Loop Back is designed for the growing segment of professionals who both operate a reference station and rely on precision positioning in their daily work. Target use cases include:

    • Precision agriculture: Farmers running auto-steered machinery, UAV-based crop monitoring, and variable-rate application systems
    • Geomatics and surveying: Professionals running a base station and multiple rover units across a site, eliminating the overhead of a local base-rover setup
    • Autonomous systems, robotics and drones: Operators deploying multiple vehicles or aircraft requiring cm-accurate positioning for mapping, inspection, or delivery workflows
    • Research: Academic and scientific teams running parallel measurement campaigns from a shared base station.

    Economics of station operation

    Most professionals who deploy a GNSS reference station do so because their business in precision agriculture, surveying, drone operations and construction demands one. By connecting that station to onocoy, operators put the same hardware to work a second time: contributing data to onocoy’s global network and earning rewards worth several hundreds of U.S. dollars per year.

    That additional income is enough to amortize the station in under two years before accounting for potential savings on subscriptions. Because onocoy applies continuous quality monitoring to every stream, operators also safeguard the positioning accuracy their business depends on.

  • Everest survey succeeds with Trimble GNSS

    Everest survey succeeds with Trimble GNSS

    The Government of Nepal has completed fieldwork for measuring Everest’s height using GNSS equipment from Trimble, including the robust R10 receiver.

    The Survey Department of the Government of Nepal has completed fieldwork for the National Initiative for the Measurement of the Height of Sagarmatha (Mount Everest). The Nepali survey team summited at 3 (local time) May 22, 2019 (by the Nepali calendar, that’s २०७६ जेठ ८, or June 8, 2076).

    The summit team of Chief Survey Officer Khim Lal Gautam and Survey Officer Rabin Karki was supported by mountain guide Tshiring Jangbu and two of his fellow Sherpas.

    The ascent was dark, windy and treacherous — the team had to make optimal use of the limited time that the hazardous conditions and their oxygen supplies afforded. The primary surveying task was to collect GNSS observations with the Trimble R10 GNSS receiver they carried.

    On the summit: Chief Officer Khim Lal Gautam, Survey Officer Rabin Karki, Sherpa Tshiring Jangbu, and the Trimble R10. (Photo: Trimble)
    On the summit: Chief Officer Khim Lal Gautam, Survey Officer Rabin Karki, Sherpa Tshiring Jangbu, and the Trimble R10. (Photo: Trimble)

    Due to the limited time window on the summit, they had essentially one shot at the GNSS observations. The R10 was configured to begin collecting observations on power-up. During training and test observations before the ascent, the R10 had proven to be exceptionally reliable, with no malfunctions.

    Compact size, light weight and durability were important factors for the receiver chosen for the summit observations. The IP67-rated R10 with internal battery weighs 1.12 kg (2.5 lb.) and operates in a temperature range of –40° C to +65° C (–40°F to +149° F). Its solid alloy housing withstands a 1-meter drop. The only concern for the team on the final ascent was to keep the battery and spares warm.

    The R10 recorded 1 hour and 16 minutes of GNSS observations. The static data (observations from GPS, GLONASS, Galileo and BeiDou) was post-processed using Trimble Business Center software together with observations from eight GNSS reference stations established as an active control network for the survey. Several of the reference stations were Trimble NetR9 network receivers with Zephyr Geodetic antennas.

    The team also used a compact ground penetrating radar (GPR) instrument to determine the distance between the top of the ice/snow cap on the summit and the highest point of solid rock beneath.

    Many of the successive accepted heights for Everest have been to the top of the ice cap, which can vary seasonally by several meters. A goal of the survey is to provide heights for both aspects of the peak. An additional reason to establish a new height for Everest is to determine whether, and by how much, the 2015 earthquakes in the region altered the mountain.

    Photo: Trimble
    Photo: Trimble

    While the Nepalese survey team’s GNSS observations on the summit will yield the height, the final orthometric elevation will be achieved by applying an updated gravity model. The gravity model was refined from supporting surveys on the mountain and surrounding region.

    A total of 298 new gravity observations were performed over several years, with companion GNSS observations on each control point. More than 248 kilometers of precise leveling, supplemented with trigonometric leveling, was performed for the network of control and base receiver locations. Instruments employed for these terrestrial surveys included Trimble DiNi levels and S9 total stations.

    Trimble GPS/GNSS instruments have been to the Sagarmatha summit on multiple occasions, including in 1990, 1998, 2005 and 2012. The R10 represents the lightest and most compact of these to date.

    By prior agreement between Nepal and China, the results of the 2019 Nepali survey, and a May 2020 Chinese survey, will be jointly announced. Official results are expected this summer.


    Featured photo: A GNSS reference station network was established before the survey to provide data for post processing, and to support additional surveying and geophysical studies of the region. (Photo: Trimble)