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RC3000 Antenna Controller Appendix HGPS Hemisphere GPS Compass

HGPS-1

Appendix HGPS – Hemsphere GPS Compass Option

Revision: 12 May. 2010 Software Version: 1.60

This appendix describes the unique features and procedures associated with the "Hemisphere GPS

Compass" navigation option.

1.1 Manual Organization

This appendix is provided as a supplement to the baseline RC3000 manual. The corresponding

paragraphs in the baseline RC3000 manual are referred to when data specific to the Hemisphere GPS

(HGPS) compass option are described.

Section 1 provides background with respect to the GPS compass sensor from Hemisphere.

Section 2 describes unique hardware and software configuration procedures which must be performed

prior to install the Hemisphere GPS sensor.

Section 3 describes unique RC3000 operations associated with the HGPS compass.

Section 4 provides troubleshooting tips related to sensor performance.

This appendix is written from the perspective of how the GPS compass integrates and works with the

RC3000 antenna controller. For further information on the CSI GPS compass itself, the user should refer

to the "Vector OEM" integration and programming manuals from Hemisphere.

1.2 RC3000 Features

This option provides the RC3000 controller with the ability to sense latitude, longitude and true heading

from a single GPS unit manufactured by Hemisphere.

Software Configuration. If this option is purchased, the navigation option designator will appear as "H".

Example: the software for a RC3000 purchased with the HGPS compass option, inclined orbit tracking

and remote control capability would be designated RC3K-xx-HTRN.

1.3.2 System Interface Requirements

Two GPS antennas will be attached via coax cable via TNC connectors to the back of the RC3000.

1.3 Theory of Operation - GPS Compass

The HGPS unit provides both latitude/longitude and true heading by measuring how two GPS antennas

are positioned relative to each other. The baseline RC3000 configuration gets this information from

separate GPS and fluxgate compass units.

Magnetic compass units can provide less than optimal performance in various poor magnetic

environments such as proximity to metal buildings, proximity to power lines and in areas where the

horizontal component of the earth's magnetic field is weak such as high latitude locations. The HGPS

compass unit may provide better results in such situations since it is generating the heading solution

based on signals from the constellation of GPS satellites.

Two GPS antennas are placed a known distance apart. The GPS engine instantaneously measures the

phase at both antennas of the signal from the same set of GPS satellites. Knowing the instantaneous

position of the GPS satellites, the GPS engine can determine how the two antennas must be oriented

with respect to each other and thus determine the heading between the two antennas.

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RC3000 Antenna Controller Appendix HGPS Hemisphere GPS Compass HGPS-1 Appendix HGPS – Hemsphere GPS Compass Option Revision: 12 May. 2010 Softwa

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RC3000 Antenna Controller Appendix HGPS Hemisphere GPS Compass HGPS-2 The following simple diagram illustrates the situation of the two antennas m

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RC3000 Antenna Controller Appendix HGPS Hemisphere GPS Compass HGPS-3 2.0 INSTALLATION This section details specific installation procedures appli

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RC3000 Antenna Controller Appendix HGPS Hemisphere GPS Compass HGPS-4 2.3.8 Navigation Sensor Communication After connecting the GPS antennas to th

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RC3000 Antenna Controller Appendix HGPS Hemisphere GPS Compass HGPS-5 COMPASS CHECKOUT After programming the various settings, the performance of t

Page 6

RC3000 Antenna Controller Appendix HGPS Hemisphere GPS Compass HGPS-6 3.0 DETAILED OPERATION With the HGPS compass option properly installed, the

Page 7

RC3000 Antenna Controller Appendix HGPS Hemisphere GPS Compass HGPS-7 3.3.2.7 GPS Compass Heading This mode allows the user to observe the true hea

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RC3000 Antenna Controller Appendix HGPS Hemisphere GPS Compass HGPS-8 3.3.2.9 GPS Compass Calibration This mode allows the user to program several

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RC3000 Antenna Controller Appendix HGPS Hemisphere GPS Compass HGPS-9 4.0 Troubleshooting NO COMMUNICATION The GPS engine needs to be programmed t

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