Triggered test variables:

TT time into test

Elapsed time since the start of the test, resolution of 1ms.

TT path dist 3D

The total distance travelled by the vehicle during the test, including any distance due to a change in altitude (see diagram), resolution of 1mm

TT forward dist 2D

The test distance measured directly forwards from the test start point (see diagram), resolution of 1mm

This is a 2D measurement consisting of forwards and vertical components.

TT deviation dist 1D

The distance away from a straight line drawn based on the heading at the start of the test (see diagram), resolution of 1mm

Deviation distance is always a 1D measurement as all of the forward and vertical components of the distance measurement are assigned to the forwards distance

TT direct dist 3D

The straight line distance from the test start point to the test end point (see diagram), resolution of 1mm

TT path dist 2D

The total distance travelled excluding any effects of changes in altitude, this is commonly used by other product manufacturers and removes the effects of errors on the vertical position. (see diagram) resolution of 1mm

TT speed 3D

Current vehicle speed, including speed due to changes in altitude, resolution of 1mm/s

TT long accel

Current longitudinal acceleration value, resolution of 1mg

When a test has finished, the peak magnitude value achieved during the test it output.

TT lat accel

Current lateral acceleration reading, resolution of 1mg

TT x dist

The distance travelled in the North direction, resolution of 1mm

TT y dist

The distance travelled in the East direction, resolution of 1mm

TT av accel

Average acceleration since the start of the test, resolution of 1mg

TT MFDD start

MFDD start threshold, resolution of 1% or 1 km/h, knots, mph, or m/s depending on units selected

TT MFDD end

MFDD end threshold, resolution of 1% or 1 km/h, knots, mph, or m/s depending on units selected

TT initial speed 3D

Vehicle speed at the start of the test, resolution of 1mm/s

For speed triggered tests this is the trigger speed, for non-speed triggered tests it is the average speed over a 0.2s period before the test

TT initial Heading

Vehicle heading at the start of the test, resolution of 0.01degrees

This is the heading of the vehicle calculated over a 2s period before the test starts.

TT final speed 3D

Vehicle speed at the end of the test, resolution of 1mm/s

TT MFDD

MFDD value from the test, calculated when the MFDD end speed is reached, resolution of 1mg

TT acc estimate

Distance accuracy estimate is only available for SPEEDBOX-INS systems, and will simply output zero on non-INS systems. Estimate of the overall distance accuracy from a measured test.

TT MFDD time

MFDD Time is the time duration over which the MFDD has been calculated.

TT trigger ready

Not ready (0) - indicates that the unit cannot start a test at present, e.g. no GPS lock or INS not converged.
Ready (1) - indicates that the unit is in a state at which testing could be performed if required, although it should be noted that this is not an absolute guarantee since conditions do continuously change.

TT trigger armed

Armed indicates the configured test will start when the configured threshold is crossed.

TT trigger test in progress

Active (1) / Not active (0); Active indicates that a test is currently in progress.

TT long collision dist

This is the distance to/from collision with the extended target bar along the current direction of rover travel, taking both rover and target movement into account.

TT lat collision dist

This is the distance along the extended marker bar to the target centre at the projected point of collision on the current rover trajectory, taking both rover and target movement into account.

TT direct collision dist

This is the direct distance from the current rover location to collision with the target centre, taking both rover and target movement into account.

TT long collision time

his is the time to collision with the extended target bar along the current direction of rover travel, taking both rover and target movement into account.

TT direct collision time

This is the time to collision with target centre, taking target movement into account, and assuming the rover follows the optimum trajectory to collide with target centre at current rover speed.

TT collision

Flag is set true if collision with the target bar +-2m from the target centre occurred during the test, and set false otherwise.

TT collision long

This is the longitude of the currently projected collision position with the extended target bar, taking both rover and target movement into account.

TT collision lat

This is the latitude of the currently projected collision position with the extended target bar, taking both rover and target movement into account.

TT long target dist

This is the distance to/from intersection with the extended target bar along the current direction of rover travel, at the current target location (i.e. target movement ignored).

TT lat target dist

This is the distance along the extended marker bar to the target centre at the projected point of intersection on the current rover trajectory, at the current target location (i.e. target movement ignored).

TT direct target dist

This is the direct distance from the current rover location to the target centre, at the current target location (i.e. target movement ignored).

TT collision speed

This is the speed at the point of collision. It is only valid if the collision flag is true.

VariableDescriptions / TriggeredTest