Accuracy Explanation and Demonstrations for Geode GNS2 and GNS1
10 Apr 2020
The Juniper Geode GNS2 and GNS1 are accurate to within a 60 centimeters radius 95–98 percent of the time at 2DRMS, or twice the distance root mean square, when receiving sufficient signals from GPS satellites along with SBAS (such as WAAS) satellite. That means around 95–98 percent of the time the Geode offers better than 60-centimeter accuracy. The Geode is accurate to fewer than 30 centimeters RMS around 67 percent of the time. Though 2DRMS is a truer estimate of field performance for GPS devices.
The test criteria for the Hemisphere GNSS receivers (such as the OEM P206 receiver in the Geode) is provided on page 6-7 of the following technical manual. Evaluating the performance of the receiver is described on page 16.
For a more general explanation of GNSS (GPS) accuracy, see GNSS/GPS Accuracy Explained.
Demonstrations of the accuracy of the Geode are described at these web links and shown in the following video.
For methods to possibly improve accuracy in specific scenarios, please see Default and Recommended Settings for Geode.
Details on how app developers can detect and display sub-meter accuracy information can be found in the following knowledge base articles.
- Developing app to use GPS in Windows
- Connection Android apps to the Geode
- Developing iOS apps for use with Geode GNS3 and GNS2