NavCom StarUtil-3000 Rev.G - Manual (Page 128)

StarUtil 3000 User Guide – Rev G
7-126
 Open the StarFire QuickStart window.
 Enter the recorded position saved the day before.
 Click the Start button to initiate QuickStart. When the QuickStart operation completes
successfully, the StarFire navigation solution is initialized to the accurately known position
from the prior day, and therefore eliminates the lengthy convergence time.
QuickStart State
 Current QuickStart State: The QuickStart process goes through these modes:

Idle: QuickStart is not initiated or in progress. Once QuickStart is initiated, Idle is
temporarily displayed if:

Power is cycled on the unit.

The command, Reset QuickStart, is applied. This causes a restart of the entire
StarFire navigation mode with no a-priori position information, i.e., full pull-in
duration.

Initiated: QuickStart is initiated, but is not operating. QuickStart operation does not begin
until the start of StarFire navigation. This requires at least five satellites each with full
dual frequency tracking and at least 10 seconds of code-carrier smoothing. If, for
example, a QuickStart initiation request is given shortly after power-on, it may be a few
minutes before these conditions are met. During this period, the reported QuickStart
mode is Initiated.

In Progress: QuickStart is operating. QuickStart is In Progress until the operation
completes or fails, or until a No Quickstart or Reset Quickstart command is received.

Completed: A QuickStart operation completed successfully.

Failed Proximity Limit: While a QuickStart operation is in progress, a check is performed
at each 1Hz navigation epoch, which compares the 3D radial distance between the
StarFire code solution
and the ‘known’ position input with the QuickStart initiation
request. If this distance exceeds 25 meters on the first QuickStart epoch, or 15 meters
on any of the subsequent epochs in the In Progress period, the QuickStart is terminated,
StarFire navigation is reset (full pull-in required), and the QuickStart mode is reported as
Failed Proximity Limit.
The StarFire code solution is the weighted least squares navigation solution performed
with smoothed code (could be single or dual frequency depending on prefilter status and
StarFire clock and orbit corrections). It is independent from the full StarFire solution,
which uses the phase biases, estimated by the StarFire extended Kalman filter. The full
StarFire solution is initialized by a QuickStart operation.