You can set up a base station in different ways depending on the application, coverage area, degree of permanence versus mobility, and available infrastructure. Before you set up a base station, please see the Setup Guidelines. For construction applications, where machine and site positioning operations using GPS will be carried out over a long time weeks, months, or yearsensure that you carefully choose the base station location.
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A semi-permanent or permanent base station helps to eliminate the types of error that can result from repeated daily setups, and ensures that you always use the GPS antenna at the exact original location. The requirement for a permanent base station setup increases as more receivers that use the base station as a source of corrections, increases the cost of any base station downtime. On the largest jobsites, and on those that remain operational for the longest time, a permanent or semi-permanent installation is a popular solution.
A SPS Modular receiver is typically used as the base station, located in a site office or trailer where it is easy to access to check or configureand where it is secure from theft and the weather. The GPS and radio antennas are normally mounted on a permanent structure on the roof of the building, where they are high and clear from obstructions and where the radio antenna can provide the maximum range of operation.
This antenna has a large ground plane that reduces multipath, providing the best GPS performance at the base location. The antennas are connected to the receiver by high quality RF cables. The receiver is connected to a permanent power supply mains or generator power. The internal battery of the receiver is always being charged, and acts as an uninterruptible power supply if there is a power failure. In some cases, the receiver may also be connected by an Ethernet cable to the Internet either through the SNM radio or a routerso that it can be monitored and configured from a remote location, and can warn an administrator by email or text message if there is a change to the configuration or status.
In these situations, the receiver can transmit corrections to a remote radio or receiver over the Internet, for rebroadcast requirements, without using repeaters.
For construction applications where a daily setup and takedown of equipment is required for security reasons, Trimble recommends that you use a T-Bar setup. The T-Bar consists of a post mounted in concrete so it cannot movewhich has a solid metal T-Bar mounted to it to provide lateral and vertical separation between the GPS antenna and radio antenna. The T piece of the T-Bar has a vertical rod at each end. Trimble recommends that one end is clearly marked GPS and the other end is clearly marked Radio so that at each daily setup, the GPS and radio antennas are mounted at the same location.
Switching antennas by mistake introduces a position error in all resulting measurements. You can buy the parts you need to make a T-Bar from any reputable hardware store. Make certain that the T-Bar cannot rotate after construction.
Rotation of the T-Bar can introduce a position error into all subsequent measurements. On the upright post, mount either a bracket to which the GPS receiver can be mountedor a well-ventilated lockbox in which the GPS receiver itself can be secured. Connect the antennas to the receiver using the appropriate cables. The receiver uses its own integrated battery, or an external 12 V battery through the 12 V crocodile clips cable that are provided with the receiver. If you choose to use AC power, remember that the heat generated by the charging process and the radio transmitter increases the need for good ventilation around the receiver.
Use of a T-Bar setup ensures that the base station is set up with exactly the same position and height every day. This helps eliminate the errors typically associated with daily tripod setup. For example, wrong antenna height, base not set up over the point, base set up in the wrong location.
If you are repeatedly moving between jobsites, or if you are visiting a jobsite for the first time before a T-Bar or similar setup can be established, Trimble recommends that you use either a tripod and tribrach setup, or a fixed height tripod. The fixed height tripod is quicker and easier to set up over a control point.This topic introduces the concept of base station operation, provides information to help you identify good setup locations, describes best practices for setting up the equipment, and outlines the precautions that you need to take to protect the equipment.
A base station consists of a receiver that is placed at a known and fixed position. The receiver tracks the same satellites that are being tracked by the rover receiver, at the same time that the rover is tracking them. Errors in the GPS system are monitored at the fixed and known base station, and a series of position corrections are computed.
The messages are sent through a radio link to the rover receiver, where they are used to correct the real time positions of the rover. You can also place an SPS Modular receiver in an easily accessible and secure location, safe from theft and the weather, while the antennas are placed high on a tower or building, clear of obstructions and able to deliver maximum performance. You can use either type of receiver in a permanent, semi-permanent, or daily quick setup configuration.
If semi-permanent or permanent operation is required, however, the modular receiver delivers significant advantages. For good performance, observe the following base station setup guidelines:. Note — The GPS antenna must have a clear line of sight to the sky at all times during operation. When you use an external power supply, the integrated battery provides a backup power supply, enabling you to maintain continuous operation through a mains power failure.
When the GPS receiver is connected to a power source that can support the power drain, the integrated battery is continuously charged from the connected power source. This helps to ensure that the battery stays charged SPS Modular only. Cell phone towers can interfere with the base station radio broadcast and can stop corrections from reaching the rover receiver.
High-power signals from a nearby radio or radar transmitter can overwhelm the receiver circuits. This does not harm the receiver, but can prevent the receiver electronics from functioning correctly.
Low-power transmitters, such as those in cell phones and two-way radios, do not interfere with receiver operations. If working in a cold climate, you may need to provide heat to the receiver.
A Smart GPS antenna can be rapidly set up on a tripod, fixed height tripod, or T-Bar anywhere that is convenient on the jobsite. The GPS antenna and, optionally, the base station radio antenna is separate from the receiver. Because the GPS antenna is separate, you can use the following optimized components: a geodetic antenna with large ground plane, to eliminate multipath the major source of GPS errors at the base station a high-gain or directional radio antenna, to increase broadcast range and to provide maximum coverage.
Base station setup guidelines For good performance, observe the following base station setup guidelines: Place the GPS receiver in a location on the jobsite where equal range in all directions provides full coverage of the site.
Using the R10 as base for RTK mapping (NTRIP)
This is more important on larger jobsites, where the broadcast range of the base station radio may limit the operations of the GPS system. Place the GPS antenna in a location that has a clear line of sight to the sky in all directions. Do not place the GPS antenna near vertical obstructions such as buildings, deep cuttings, site vehicles, towers, or tree canopy. Place the GPS and radio antennas as high as practical. This minimizes multipath from the surrounding area, and enables the radio to broadcast to the maximum distance.
Choose the most appropriate radio antenna for the size and footprint of the site. The higher the gain on the antenna, the longer the range. If there is more focus on the transmission signal, there is a reduced coverage area. A 3 db or 5 db gain antenna provides a mix of good range and reasonable directional coverage.
Make sure that the GPS receiver does not lose power. The GPS receiver has an integrated battery that must be charged. To operate continuously for more than a day without loss of power at the base station, provide external power.
Sources of external power include: AC power 12 V car or truck battery Trimble custom external battery pack Generator power Solar panel. Do not locate a GPS receiver, GPS antenna, or radio antenna within meters about 1, feet of: a powerful radar, television, or cellular communications tower another transmitter another GPS antenna.
Do not set up the base station directly beneath or close to overhead power lines or electrical generation facilities.
The electromagnetic fields associated with these utilities can interfere with GPS receiver operation. Other sources of electromagnetic interference include: Gasoline engines spark plugs Televisions and computer monitors Alternators and generators Electric motors Equipment with DC-to-AC converters Fluorescent lights Switching power supplies Place the GPS receivers in a protected and secure location.In the case where you have access to RTK base station sall you need is an internet connection from your mobile device to the RTK base station.
Although there is no hard limit with respect to distance, generally-speaking you want it to be within miles. The only variable is that you must have an internet or some other wireless data connection to the RTK base station. In situations where there are no RTK base stations available in your area, you can setup your own.
Whereas 10 years ago this was a fairly expensive undertaking, the hardware, software and internet connection are more affordable today, making this an achievable endeavor. All in all, this equipment fits in a size of about half of a shoe box.
This is what it looks like:.Trimble Access: How to configure the base and rover with and external base radio
The device on the right is an Intel NUC computer. Display and keyboard are optional. Typically, people just use Microsoft Remote Desktop software to access it. This illustrates how small and simple it is to house an RTK base station.
Once the software is installed, there are no annual maintenance or operation fees. With the software, you can setup and manage login credentials for an unlimited number of users.
However, if there is a subscription cost eg. Furthermore, if you operate your own RTK base station, you can make the data available to government or NGO partners in your area, either for a fee or for free.
GNSS is changing a lot. Both Galileo and BeiDou are actively launching new satellites, and a third frequency L5 is being broadcast. With four constellations and three frequencies, RTK will perform faster than ever before, especially in challenging environments. The Arrow Gold and Arrow both have this functionality. RTK base station software.
Eos offers the Eos Server software. Simple computer to run the Eos Server software or you can use Amazon Web Services, or similar, to host the software.
Download Article as PDF. ET Follow Eos:.Absolute precision and trusted reliability mean the difference between getting the project done right the first time versus positioning errors and work delays. We invented VRS technology and remain the industry leader in providing centimeter-level accuracy.
Our reliable network ensures you have uninterrupted connectivity, so you don't have to worry about dropped signals. Keep on working without interruption. Just connect, correct, and measure.
VRS Services ensure you have the speed and accuracy you need to get your job done right. Available in areas of North America, Europe and Australia with comprehensive cellular coverage. Instant access to the most accurate RTK-level positioning services, ideal for detailed work in fixed locations. A high-precision agriculture service that delivers RTK-level positioning instantly, no local base station or radio required.
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Better than 2 centimeter accuracy for jobs that require the highest level of precision positioning. A reasonable annual subscription provides you with year-round access to reliable, high accuracy corrections within the network. Converge Instantly. Absolute Accuracy With accuracy levels less than 2 centimeters, you can get your job done right the first time with on-point positions. Better Uptime Our reliable network ensures you have uninterrupted connectivity, so you don't have to worry about dropped signals.
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Cost Effective A reasonable annual subscription provides you with year-round access to reliable, high accuracy corrections within the network.Traditional GNSS correction methods rely solely on radios and repeaters to cover larger construction sites.
In doing so, it extends the range of base station correction sources and is more reliable than using standard radio communications, which can be subject to range limitations and black spots.
It also increases jobsite flexibility, improves coverage and reduces the time needed to get new job sites up and running. It removes technology headaches and set-up complexity, so a contractor can be set up and running IBSS within a few minutes.
A contractor can very easily connect machines, vehicles and rovers to a base station, whether it is located in the office, on the local site, or on a site kilometers away.
A base station using IBSS is fully under the contractor's control with password protection and can be shared between multiple project partners and job sites using the Connected Community. Trimble IBSS is ideal for small contractors who have a few assets deployed on a project, where deployment of radio infrastructure is expensive or time consuming. For example when utilizing a single asset at a remote dump site or borrow pit, cellular connection is a way to reach that location from the project base station without the need for additional base stations or radio infrastructure.
This allows the radio rebroadcaster to be located in a static location where good cellular coverage is available and allows multiple GNSS rovers and machines to operate anywhere within radio range. This set-up reduces the need for multiple modems and cellular service plans connecting each asset individually to the IBSS server, or long radio repeater chains, saving the contractor considerable costs while also providing a more reliable service in difficult coverage areas. IBSS offers precise GNSS coverage to remote or offsite project areas such as borrow pits, dump sites or other projects within a 30 kilometer 18 mile range and provides more flexibility for the setup of GNSS infrastructure on large projects.
This is especially useful for companies running multiple projects within a 30 kilometer 18 mile radius to solve radio outage problems on large projects or in difficult terrain. This is useful for new site reconnaissance or for initial site works such as setting site limits, clearance lines or silt fencing and topsoil stripping without the need to set up a local base station.
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