Chapter 2

SPAN Installation

2.3.1Mount the Antenna

For maximum positioning precision and accuracy, as well as to minimize the risk of damage, ensure that the antenna is securely mounted on a stable structure that will not sway or topple. Where possible, select a location with a clear view of the sky to the horizon so that each satellite above the horizon can be tracked without obstruction. The location should also be one that minimizes the effect of multipath interference. For a discussion on multipath, refer to the GNSS Book available from www.novatel.com/an-introduction-to-gnss/.

Ensure the antenna to IMU distance and orientation does not change due to dynamics.

2.3.2Mount the SPAN-IGM

Mount the SPAN-IGM in a fixed location where the distance from the SPAN-IGM to the GNSS antenna phase center is constant. Ensure that the orientation with respect to the vehicle and antenna is also constant.

For attitude output to be meaningful, the SPAN-IGM should be mounted such that the positive Z-axis marked on the SPAN-IGM enclosure points up and the Y-axis points forward through the front of the vehicle, in the direction of track.

Figure 5: SPAN-IGM Enclosure Mounting

Also, it is important to measure the distance from the SPAN-IGM to the antenna (the Antenna Lever Arm), on the first usage, on the axis defined on the SPAN-IGM enclosure. See Appendix A, Technical Specifications on page 52 for dimensional drawings of the SPAN-IGM.

Ensure the SPAN-IGM cannot move due to dynamics and that the distance and relative direction between the antenna and the SPAN-IGM is fixed. See also SPAN IMU Configuration on page 24.

The closer the antenna is to the SPAN-IGM, the more accurate the position solution. Also, your measurements when using the SETIMUTOANTOFFSET command must be as accurate as possible, or at least more accurate than the GNSS positions being used. For example, a 10 cm error in recording the antenna offset will result in at least a 10 cm error in the output. Millimetre accuracy is preferred.

The offset from the SPAN-IGM to the antenna, and/or a user point device, must remain constant especially for RTK or DGPS data. Ensure the SPAN-IGM, antenna and user point device are bolted in one position perhaps by using a custom bracket.

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SPAN-IGM User Manual Rev 2

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Novatel OM-20000141 user manual Mount the Antenna, Mount the SPAN-IGM
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OM-20000141 specifications

The Novatel OM-20000141 is a high-performance multi-GNSS (Global Navigation Satellite System) receiver designed for various applications including precision agriculture, autonomous vehicles, and surveying. This state-of-the-art device combines cutting-edge technologies to provide accurate and reliable positioning data, making it an indispensable tool for professionals in fields that rely on geolocation.

One of the standout features of the Novatel OM-20000141 is its multi-frequency support, allowing it to receive signals from GPS, GLONASS, Galileo, and BeiDou systems. This capability significantly enhances the accuracy and reliability of positioning information, particularly in challenging environments where signal interference can occur. By utilizing multiple frequencies, the OM-20000141 can mitigate errors caused by atmospheric disturbances and multi-path signals, resulting in improved precision.

In addition to its multi-GNSS capabilities, the receiver incorporates advanced RTK (Real-Time Kinematic) technology, enabling centimeter-level accuracy. This is particularly beneficial for applications that require pinpoint geolocation, such as precision agriculture, where farmers need to optimize crop yields and resource usage. The RTK technology allows users to achieve real-time positioning corrections, making it a vital tool for surveying and construction projects that demand high precision.

The Novatel OM-20000141 also features built-in connectivity options, including Bluetooth and USB interfaces, facilitating seamless integration with other devices and systems. This connectivity is crucial for enabling real-time data sharing and remote monitoring, enhancing the usability of the device in various operational environments.

Robustness is another significant characteristic of the OM-20000141. Designed to withstand harsh conditions, the receiver features a durable housing that protects it from dust, moisture, and extreme temperatures. This resilience ensures that the device operates effectively in all weather conditions, making it suitable for outdoor applications.

Furthermore, the receiver is equipped with intelligent positioning algorithms that optimize performance in urban canyons and dense foliage areas, where traditional GNSS receivers may struggle. By leveraging these algorithms, the OM-20000141 can maintain reliable positioning even in challenging environments.

Overall, the Novatel OM-20000141 stands out as a versatile and reliable GNSS receiver, merging advanced technologies to deliver high accuracy and reliability. Its exceptional features make it an invaluable asset for professionals in various industries, enhancing their ability to achieve precise geolocation and optimize their operations.
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