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StarFire Rapid Recovery

What is StarFire Rapid Recovery?

StarFire Rapid Recovery is a proprietary technique which allows NavCom’s GNSS receivers to resume StarFire level of accuracy (5cm) after a GNSS signal outage. Before the introduction of Rapid Recovery, the GNSS receiver had to allow the StarFire solution to re-converge, after re-acquiring the GNSS satellites which could take in excess of half an hour to accomplish. The new Rapid Recovery technique provides 5cm level accuracy within two minutes after resuming GNSS navigation in StarFire mode.

How Does StarFire Rapid Recovery Work??

The receiver applies a technique of StarFire re-initialization from previously resolved ambiguities. If a StarFire receiver mounted on a vehicle passes under a bridge, the receiver will lose lock on all GNSS satellites and the navigation flag becomes invalid. When the vehicle is in the open again, the receiver begins to track satellites again. It will enter Standalone GNSS mode, then potentially SBAS and StarFire Single modes. Once it attains StarFire Multi-frequency mode, the Rapid Recovery initialization is enacted and the receiver resumes normal StarFire converged performance in a matter of seconds. The entire process includes the: time of outage + reacquisition + navigation + transition to StarFire + Rapid Recovery initialization. The timing of the process varies based on the environment encountered and the PDOP value once navigation is resumed.

What systems can use StarFire Rapid Recovery?

All Sapphire and newer generation products are capable of StarFire Rapid Recovery. This currently includes the Sapphire board, SF-3040,  SF-3050, and LAND-PAK.

What is the maximum outage time before StarFire Rapid Recovery is unable to regain StarFire accuracy?

3 minutes

What is the maximum distance that a receiver can travel before StarFire Rapid Recovery is unable to regain StarFire accuracy?

10 km

Are there any dynamic acceleration constraints that exist?

Because the ionosphere and troposphere are not changing dramatically during the outage, acceleration is not a factor for StarFire Rapid Recovery.

Are there any velocity constraints that exist? Will this work all the way up to 515m2/sec?

StarFire Rapid Recovery will work at velocities up to the COCOM limit of 515m2/sec.

What are the DOP limits for StarFire Rapid Recovery to function properly?

PDOP < 4 and HDOP <3.

If you’re in RTK Extend mode – does StarFire Rapid Recovery still function?

No. RTK Extend is an augmentation mode to RTK. However, if the receiver transitions from RTK Extend to StarFire mode, then StarFire Rapid Recovery will serve to augment StarFire mode.

Is there a difference in StarFire Rapid Recovery performance if you’re in GPS-Only mode versus GPS+GLONASS?

Not under normal operating conditions (i.e. open sky). The performance differences between GPS-Only and GPS+GLONASS are based on the DOP and overall geometry of satellites tracked and used in the navigation algorithm.

How do I get StarFire Rapid Recovery?

  • The receiver needs an active StarFire license. The standard receiver StarFire license authenticates both correction delivery services
  • The receiver needs to operate on production software version 3.3 or later. Please contact Customer Support for a current copy of the software.