GPS World

Tag: RTK receiver

  • Altus Introduces RTK Receiver for Esri Community

    At the 2014 Esri User Conference, Altus Positioning Systems is unveiling a new GNSS RTK receiver designed and developed specifically for the Esri user community.

    According to Altus CEO Neil Vancans, the new Altus APS-NR2 provides a new combination of performance and features that make it ideal for Esri users:

    • Light weight – At 1.5 lbs., the APS-NR2 weighs the same as a dozen glazed doughnuts.
    • Dual-cellular antennae – With automatic switchover, users will minimize downtime due to signal loss.
    • Unlimited flexibility – It works on virtually all RTK networks.
    • Built-in Wi-Fi – Users can configure and monitor the unit and stream data directly to their own tablets.
    • Supercharged – It runs all day on hot-swappable batteries and recharges from any USB port.
    • Esri Compatible – It communicates seamlessly with Esri cloud-based platforms.
    • Open architecture – Users can choose their own data collector software or interface directly with Esri ArcGIS Online.

    “It all adds up to the world’s most versatile RTK rover that provides more productivity and less downtime in the field,” said Vancans. “The APS-NR2 raises the bar and sets a new standard for the state-of-the-art in high-precision surveying and geolocation, leveraging the power and convenience of mobile tablet platforms.”

    The APS-NR2 will be commercially available by September, according to Vancans.

    In addition to the APS-NR2, Altus will show the APS GeoPod, a compact GNSS module that adds high-precision RTK positioning to any USB-compatible tablet PC. “This unique product gives users the convenience of adding RTK precision to any on-board application on their own mobile devices,” said Vancans.

    Altus is showcasing the APS-NR2 and APS GeoPod, along with the full range of Altus products, in Booth 1218 at the 2014 Esri Users Conference, July 14-18, in the San Diego Convention Center.

  • Geneq Introduces Palm-Sized GPS/GLONASS RTK Receiver for Real-Time Centimeter Accuracy

    Geneq Inc. has launched the SXBlue III GNSS, a palm-sized GNSS RTK receiver that uses both GPS and GLONASS for real-time centimeter accuracy. Via Bluetooth, it brings centimeter accuracy to any smartphone, handheld, tablet, or notebook computer that is Bluetooth-compliant.

    sxblue3gnss_hand

    According to the announcement, the SXBlue III GNSS uses new, patented technology that allows it to generate corrections for both GPS and GLONASS satellite data even if the user’s reference station (or RTK network) only supports GPS. This opens up productivity benefits of GLONASS to all high-precision users around the world, and not just ones who have access to GLONASS-enabled reference stations, Geneq said.

    “With its competitive price and creative implementation of GLONASS, the SXBlue III GNSS will open new doors for users who want to improve their productivity with GLONASS but don’t have control over their reference station infrastructure,” said Jean-Yves Lauture, product engineer. “With the SXBlue III GNSS, the user doesn’t need to be concerned with their RTK reference station at all. It could be a 20 year-old GPS-only reference station and the SXBlue III GNSS will still create corrections for the GLONASS data and allow you the benefit of GPS/GLONASS RTK productivity in the field.”

    By implementing GLONASS, the SXBlue III GNSS immediately increases your RTK productivity with its ability to track 55 satellites (31 GPS, 24 GLONASS). With 12 to 19 satellites in view at all times, the SXBlue III GNSS provides superior performance when working in tough environments such as in and around tree canopy, buildings, and rugged terrain.

    The company reports the next-generation SXBlue III GNSS is a small, palm-sized unit that uses a 2.7-inch diameter GNSS antenna. The unit is  waterproof (submersible), dustproof, and ruggedized, with an IP-67 rating. Its Class-1 long-range Bluetooth 2.0 has a typical range of 250 meters. The internal, rechargeable, field replaceable Li-Ion battery has on-board LEDs to let the user know how much battery life is left. The operating temperature range of the SXBlue III GNSS is -40°C (-40°F) to 85°C (185°F).

    In addition to the built-in long-range Bluetooth transceiver, the SXBlue III GNSS also has a standard DB-9 RS-232 port and a USB Type B port whose outputs are fully programmable up to 10-Hz standard with a 20-Hz option.

    The SXBlue III GNSS is targeted at high-precision users in industries such as surveying, GIS, utilities, construction, agriculture, engineering, and other natural resource industries in addition to local, state, and federal government users.

  • I’m Buying A New RTK Receiver. What Should I get?

    In light of this weeks webinar, A Closer Look at L5: The Future of High-Precision GNSS, and spurred by an email from a reader about how to sift through all the GPS/GNSS receiver choices, following are my thoughts if you’re looking to purchase an RTK receiver today.

    First of all, an email from a reader succinctly sums up the challenge:

    I currently utilize static GPS / GLONASS receivers in my day to day operations and I am looking at buying a couple more receivers (an RTK setup). To be honest, I am totally confused as to what technology I should buy.
    Specifically, I don’t know whether or not it is worth buying receivers that have L2C and L5 capabilities. It seems that vendors are not very well educated on what these options can do for you, and how many satellites are up and running that provide these signals. It is my understanding that L2C is simply a civilian code that is carried on the L2 frequency, and that it provides an almanac and atmospheric correction information. I don’t even know if receiving L2C will help me as a surveyor, or if it is more designed for autonomous use in navigation. It sounds like L5 will be of great advantage once the constellation has enough SVs that broadcast it.  It also seems like Galileo will be extremely helpful for surveyors, but who knows when that will be available. Basically, I don’t want to spend thousands of extra dollars for “bells and whistles” that are not yet operational from a practical standpoint, and that won’t be in the near future.

     

    He’s right. There are a lot of moving parts these days in the world of GPS/GNSS. Not only are GPS/GNSS receivers steadily improving (better, smaller, faster, cheaper), but the GNSS themselves (GPS, GLONASS, SBAS) are changing too. Making a decision of which “bells and whistles” to pay for and which ones to pass up is not so easy.

    Let’s break it down and see if we can clear things up.

    It used to be that when looking to purchase a dual frequency GPS receiver, the choice was simple because RTK receivers came in one flavor, L1/L2.

    Do I want RTK (real-time centimeter positioning) or am I satisfied with post-processing the GPS data?

    Either way you went, it was an straight-forward decision.

    Today, that is not the case. If you choose RTK, there are many options available:

    -GPS L1 or GPS L1/L2?

    -add GLONASS?

    -add L2C?

    -add L5?

    -add Galileo?

    The pricing of these options can be substantial. The reader’s letter goes on…

     

    I have a vendor that is pushing an L2C capable receiver on me for more money than a standard dual frequency dual constellation receiver.  The other option is to spend about $13K more and get the L2C, L5, and Galileo ready receiver.

    If you look at what the manufacturer’s are offering for GPS/GNSS RTK receivers, it seems there are generally four choices:

    1. GPS L1

    2. GPS L1/L2

    3. GPS L1/L2 + GLONASS

    4. GPS L1/L2 + GLONASS + L2C + L5 + Galileo

     

    GPS L1

    longer initialization (issue when working around trees)

    short baseline length

    Really should have the same base/rover receiver (SBAS), not really suited for RTK Network usage.

     

    GPS L1/L2

    Legacy, proven technology.

    Upside…less expensive, entry level dual frequency RTK

    Downside…GPS “brownouts”, susecptible to semi-codeless sunset

     

    GPS L1/L2 + GLONASS

    Eliminates the GPS “brownout” problem.

    Increased cost, although some manufacturers include it.

    Doesn’t support future signals

    Suscpetible to semi-codeless sunset.

     

    GPS L1/L2 + GLONASS + L2C + L5 + Galileo

    Eliminates the GPS “brownout” problem.

    Ready for future signals

    downside…future singals aren’t available yet.

    Increased cost