ADU2 datasheet(39/162 Pages) ETC

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Antenna Calibration

Page 27

Antenna Calibration

This chapter describes the antenna calibration process for a static calibration and a

dynamic calibration. An antenna calibration must be performed and the resultant vectors

entered before the ADU2 can calculate attitudes.

A static calibration can be used for the following circumstances:

•

stationary vehicle

•

vessel moored to a pier or in dry dock. A static calibration tolerates small antenna

motions such as rising and falling tides if the tide range is less than 6 feet.

•

aircraft parked on tarmac

A dynamic calibration should be used for a vessel, aircraft, or other vehicle which moves

during the antenna calibration.

Static Calibration Procedure

Conduct the static calibration procedure when the vehicle does not physically move

during calibration. You only need to calibrate the antennas once. However, you must

recalibrate the antenna array if the relative positions of the antennas change (i.e. replacing

an antenna, lowering and /or raising of antennas, etc.).

Every attempt should be made to set the antenna platform level during calibration.

The static calibration procedure has the following steps:

Collect the data (ADULOG)

Split the data (SPLIT3DF)

Process and view the data (GPPS)

Adjust relative antenna positions (ADJENU)

Enter offset vector information (REMOTE).

Collect the Data

After the antennas are tracking satellites, the calibration data can be collected. Use

ADULOG to collect measurement data. Additional, detailed information about

ADULOG and the measurement data is available in Chapter 7, ADULOG. Table 4.1

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