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New features for SatGen

6 September 2022

Designed to create custom GNSS RF I&Q or IF data files based on user-generated trajectories, the updated software now has the ability to create custom leap second scenarios for any date and includes two of the new Galileo E1-B signal features introduced in the Galileo Interface Control Document version 2.0.

Version 3.14.27 comes with many other optimisations and bug fixes. For the full list, please check our history notes.

Custom Leap Second Scenarios

With the new version of SatGen customers can create leap second scenarios for any date, with both positive and negative leap seconds allowed. This means that, in addition to simulating previous leap second events in SatGen, you can now also simulate future leap events to test the robustness of your device.

In the context of the recent speeding up of Earth, it blazed through July 26, 2022, 1.50 milliseconds ahead of schedule, it's more than likely that you will have to consider testing for the effects of Earth's acceleration. SatGen now makes it possible to use negative leap seconds in your simulations.

Details on Leap Second Generation with SatGen can be found here.

New features for Galileo Open Service signals

A new Interface Control Document (OS SIS ICD v2.0) has been issued by the EU Agency for the Space Programme (EUSPA) in January 2021, introducing major updates to Galileo Open Service signals. In particular, three changes for the I/NAV message transmitted on the Galileo E1-B signal component.

Although these modified signals are not yet being broadcast by the Galileo satellites, this document allows receiver manufacturers to prepare for the implementation of the new I/NAV capabilities now.

Three new features in the I/NAV message transmitted on the Galileo E1-B signal component:

  • Reduced Clock and Ephemeris Data (RedCED);
  • Reed-Solomon Outer Forward Error Correction Data (FEC2); and
  • Secondary Synchronization Pattern (SSP).

These new features represent a major evolution of the Galileo Open Service signals, which will provide all users with a more robust and faster retrieval of the Clock and Ephemeris Data, particularly for users in challenging environments, while at the same time allowing for a faster reconstruction of the Galileo System Time (GST). This will result in a faster Time to First Fix for users whose receivers are able to exploit the new solutions.

Manufacturers and developers can now use SatGen to test receivers in preparation for the transmission of the new Galileo I/NAV messages. Reduced Clock and Ephemeris Data (RedCED) and Secondary Synchronization Pattern (SSP) have already been implemented. Reed-Solomon Outer Forward Error Correction Data (FEC2) will follow in the next SatGen release.

The Galileo system is set to begin transmitting the new I/NAV capabilities by 2023.

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