RC3000 Antenna Controller

Chapter 1

Introduction

The azimuth portion of the pointing vector is calculated with respect to local true North. The fluxgate compass is used to determine the heading of the centerline of azimuth travel and the required movement in the azimuth axis is calculated.

In the above example a true heading of 135 degrees to the satellite has been calculated. Based on the mount’s latitude, longitude and date, a local magnetic variation (see 1.3.8) of 10 degrees is calculated. The compass senses a magnetic heading of 55 for the azimuth reference direction. Applying the magnetic variation, this yields an apparent true heading of 45 degrees for the antenna reference direction. An azimuth movement of 90 (135 – 45) degrees clockwise is therefore needed to point at the satellite.

Since a position sensor on the azimuth axis is always active, the RC3000's default displayed azimuth value is that of the antenna angle. Derived estimates of the magnetic and true heading of the mount may be selected in the MANUAL (3.2.1) and LOCATE (3.2.2.3) modes.

10

Page 18
Image 18
HP manual RC3000 Antenna Controller Chapter Introduction