Bedienungsanleitung ComNav Vector G2B (Seite 61 von 110) (Englisch)

521994

Zoom out

Zoom in

Vorherige Seite

1/110

Nächste Seite

ComNav Vector G2/G2B Installation & Operation Operation

Document PN 29010078 V2.0 - 59 -

DRAFT #3 – 29 May 2009

Disabling the Tilt Sensor

The Vector G2’s tilt sensor is enabled by default.

You can turn the tilt sensor off with a $JATT,TILTAID,0 command.

The only time you might need to do that is when troubleshooting, to ensure the GPS

receiver is working properly.

Re-calibrating the Tilt Sensor

The tilt sensor is pre-calibrated at the factory.

However, if you experience any large amount of tilt measurement error (more than about

6° from actual tilt angle), you can recalibrate the sensor, by using the $JATT,TILTCAL

command. To do this: power off the G2, shield it from all satellite signals, check that it is

as level as possible, power it back on, and then issue the recalibration command.

You can observe the actual tilt measurements from the sensor by sending the

$JASC,INTLT,rate[,OTHER] command to the G2.

Disabling the Gyro Sensor

The G2’s internal gyro sensor is enabled by default.

The only time you might need to disable the gyro is when troubleshooting, to ensure GPS

the receiver is working properly.

You can turn the gyro off by sending a $JATT,GYROAID,0 command.

Smoothing Output Data with Time Constants

The G2 incorporates user-configurable time constants which can provide a degree of

smoothing to the course over ground, heading, pitch, rate of turn, and speed outputs.

Each time constant – called “something” TAU – is a value that sets the length of a simple

averaging filter for that specific output. For example, the default value of HTAU tells the

G2 to smooth heading outputs with a filter that is 2.0 seconds in length.

Table 17 (on the next page) describes all the time constants.

Changing the Time Constants

The G2’s

default time constant settings are fine for most users.

But you can set the time constants to be a better match to the dynamics of your vessel, if

you like.

• For instance, if the vessel is very large and is not able to turn quickly, increasing

the heading time constant (HTAU) might be useful. The resulting heading values

would have less apparent jitter

, and be more consistent – both from moment to

moment and over longer periods of time as the vessel moves – with the vessel’s

“real” heading.

• On the other hand, increasing a time constant also increases the G2’s time lag in

responding to actual changes in the value being measured – i.e., it takes longer

for a “real change” in the value being measured to show up in the G2’s output

data.

Worse, increasing a time constant too far could create an unacceptable lag in the

measurement – to the point where the navigation equipment that is receiving

data from the G2 would begin to be adversely affected.

– For example, an autopilot will begin to appear sluggish in its steering

performance, if the heading time constant is increased too far. That’s

because the time lag on heading will become so large that the autopilot can

not “see” small changes in heading quickly (or perhaps even not at all).

There will always be some residual jitter in computed-heading data, even with the G2’s sophisticated RTK

algorithms. It’s an unavoidable effect of the physics & underlying mathematics of the overall GPS system.

www.busse-yachtshop.de | info@busse-yachtshop.de

Missbrauch melden von Frage und/oder Antwort

Libble nimmt den Missbrauch seiner Dienste sehr ernst. Wir setzen uns dafür ein, derartige Missbrauchsfälle gemäß den Gesetzen Ihres Heimatlandes zu behandeln. Wenn Sie eine Meldung übermitteln, überprüfen wir Ihre Informationen und ergreifen entsprechende Maßnahmen. Wir melden uns nur dann wieder bei Ihnen, wenn wir weitere Einzelheiten wissen müssen oder weitere Informationen für Sie haben.

ComNav Vector G2B Seite 61

Brauchen Sie Hilfe? Stellen Sie Ihre Frage.

Missbrauch melden von Frage und/oder Antwort

Art des Missbrauchs:

Forenregeln

Neu registrieren

Das Handbuch wird per E-Mail gesendet. Überprüfen Sie ihre E-Mail.

Ihre Frage wurde zu diesem Forum hinzugefügt

Info