L3Harris Narda SignalShark, Руководство пользователя

Страница: 154 / 231

SignalShark User Manual
154
GNSS Velocity
The ADFA has a built in GNSS module. When moving, the SignalShark calculates the north
direction by correlating the positions received via the GNSS data. Since the Compass
method can not be used in a metallic environment, this setting should be used, if the ADFA is
mounted on a vehicle.
Some important notes, when using the GNSS Velocity setting:
• The reference mark notch of the ADFA must be aligned as accurately as possible to the
direction of travel.
• For GNSS north direction accuracy, see also Velocity Squelch
Ref. Mark. Dir.
The base plate of the ADFA has a notch that can be used as reference direction. An arrow
on the radome points in the direction of this notch. Alignment tips mounted to the ADFA base
plate can be used to align the ADFA in notch direction to a reference point.
If the magnetic compass is not precise enough, you can use this method to align the
ADFA to a land mark (e.g. a hill or a big building):
1.
Align the ADFA with help of the alignment tips in the direction of the land mark.
2.
Determine the position of the ADFA.
3. Draw a line between the ADFA position and the land mark.
4. Calculate the angular difference between this line and the direction to north.
5. Enter this value into the parameter button Ref. Mark. Dir.
The reference mark direction can also be used for presentations:
1. Connect SignalShark to a big screen or beamer.
2. Align the ADFA with its notch in the direction of the screen.
3. If you now move a transmitter around the ADFA, the audience can easily follow the
bearing results on the screen.
Setting the reference mark direction (Ref. Mark. Dir.)
The reference mark direction setting is needed only, when North Reference is set to
Ref. Mark. Dir. (see Configuring_the_north_reference ).
Setting the reference mark direction:
1.
Tap the Ref. Mark. Dir. button.
2. Turn the Rotary knob or enter a value to set direction.
3. Press the Rotary knob or tap the OK button.
Configuring the azimuth correction (Azimuth Corr.)
The parameter Azimuth Corr. can be used to add an additional known azimuth deviation.
For example:
•
If the ADFA is mounted on a car, but the reference mark is not exactly aligned to the
direction of travel, you can use this parameter to enter the number of degrees of deviation.
•
You can determine this deviation by using a test transmitter aligned exactly to the middle
of the front of the vehicle. The transmitter should be located several ten meters away from
the car.