GPS and GNSS receivers are used in cars, drones, boats, and ADAS systems. These technologies are essential to our everyday lives, and we rely on them for precise positioning.
While most modern GNSS receivers can determine their positions with 2-4 meters accuracy. RTK is the technique that enables centimeter-level accuracy.
Use a Multi-Frequency Receiver
If you’re a GIS professional looking to maximize your mapping and surveying performance. It is using a multi-frequency receiver can make a huge difference. This type of receiver tracks multiple GNSS constellations and multiple satellites at once. It is giving you better accuracy and speed than single-frequency systems.
The benefits of a multi-frequency receiver are many, including faster acquisition times and more robust solutions designed to withstand harsh environments. It is especially true when you’re in an urban area with many obstacles that can derail your position and cause errors.
Multi-frequency GNSS from Bench Mark USA can also help you to improve your data quality by removing ionospheric delays from the signals. It is important because it can improve your GPS tracking to centimeter accuracy. This is reducing the number of errors you must fix.
Compared to SBAS, GPS RTK can significantly increase your accuracy and decrease your convergence time in the field. However, it has limitations, and you should know them before deploying them in your projects.
Use a Tribrach
These devices can be incredibly useful for surveyors who need an onboard antenna but don’t want to deal with the hassle of setting it up. It is maintaining an RTK base station in its field. They can also be helpful for those performing a large, long-distance survey that requires the use of satellite-based correction services.
Another benefit of using a tribrach is that it can measure heights and accurately calibrate the antenna. It helps to determine the antenna’s effectiveness and ensure that it operates at optimal levels in various environments.
It’s also an effective tool for measuring and comparing the accuracy of different antennas. Which can help you decide which is most appropriate for your application. This tool can be a lifesaver, especially when working in remote areas where the signal from the GPS or GNSS satellites isn’t as strong.
Set Up the Base Station Over a Known Position
Base stations also provide coverage over a larger area than single hand-held radios can, producing a high wattage output. They are commonly used for professional and amateur radio communications. Such as taxicab services and tow truck companies.
Depending on local regulations, base stations typically emit low levels of electromagnetic energy, which can have a minimal impact on human health. A base station’s antenna is placed on a mast above ground level, and the power output from the station’s receiver is restricted to minimize exposure to electromagnetic radiation.
A base station receives GPS signals from satellites and then corrects the GPS data it collects. These corrections correct several sources of error affecting GPS measurements, including timing, satellite orbits, and atmospheric conditions.
The base station’s transmitter also contains a spectrum analyzer that measures the frequencies other nearby devices use. This transmits the signal in a different frequency range to avoid conflicting signals.
The base station can also communicate with other devices over a wireless network or Bluetooth to share information. It can be done with an external wireless modem or a built-in modem included in the base station.
Check the Antenna Height
The antenna height is one of the most important things to consider when deploying RTK GPS systems and GNSS receivers. It is because the antenna will be absorbing signals from nearby objects that can negatively impact accuracy, such as trees and houses. By raising the antenna, it will be above these obstructions and less affected.
As well as this, the antenna will be higher above objects that might cause interference in terms of radio signals. These can include cars, power, and buildings.
To ensure that the antenna is in a good position, it can be helpful to check the antenna height using a contour map of the site. It will give you a clear idea of where the antenna is located in relation to your target and what it will detect.
Depending on the type of RTK you are utilizing. It may be a good idea to have an antenna at least 15 meters above the horizon. It will help to minimize atmospheric error and improve multipath error. The antenna height will depend on the type of RTK you are implementing and whether or not you are working with a network. For example, if you are working with a network of reference stations in a Network RTK setup. You will need to have an antenna at least 15 meters above the horizon and in a position where the GNSS signals can be received well.
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