Research-concepts RC3000 Manuel d'utilisateur Page 23
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
RC3000 Antenna Controller Chapter 1 Introduction
15
1.3.9 System Performance
The performance achieved by the RC3000 in locating and tracking satellites is dependent on the
mechanical tolerances of the mount, the correctness of the installation and the accuracy of the various
sensors.
The largest source of error for the system is due to errors in determining the truck's magnetic heading.
Errors in heading primarily affect the accuracy of the antenna's calculated azimuth position. The flux gate
determines the magnetic heading by measuring the direction of the magnetic field at the sensor tower.
Problems arise because the earth's magnetic field can be distorted by ferrous metals (such as steel and
iron; aluminum is a non-ferrous metal) and man-made magnetic fields. These man-made fields can be
generated by electric motors, generators, and transformers, as well as those "worked into" the coach
body during manufacturing.
For the flux gate sensor, there are two unique categories of objects that distort the magnetic field in the
vicinity of the truck. Some of the distortion is due to objects and electrical devices on the truck itself. This
component of the distortion can be largely compensated for during system calibration.
The other component of the distortion is due to large metal objects and man-made magnetic fields around
the site where the truck is being operated. This component of the distortion varies as the truck moves
from one location to another, and it affects the accuracy of the calculated azimuth position. Environments
which typically produce the largest errors include railroad yards, areas around electrical substations, and
sites near structures containing large amounts of steel or iron, such as bridges or large buildings.
To date, the largest known azimuth error due to these interactions is less than 10 degrees. To help
alleviate this azimuth error, the Auto Peak feature scans an azimuth range about the target azimuth and
seeks the strongest signal. This feature is explained in full in section 3.2.2.3.
The RC3000 uses a 10 bit analog to digital converter for measuring voltages from azimuth, elevation and
polarization potentiometers as well as measuring signal strength inputs. In most cases this provides
adequate resolution but should be considered. For example, if the azimuth axis has 360 degrees of
travel, the resolution achieved is 360 / 1024 (approximately 0.35 degrees). This example highlights why
pulse or resolver sensors are used to make precise movements for inclined orbit tracking. The optional
resolver interface uses a 16 bit resolver to digital converter. This allows resolution of 0.0055 ( 360 /
65536) degrees.
- USER’S MANUAL 1
- 1.0 INTRODUCTION 9
- 1.1 Manual Organization 9
- 1.2 RC3000 Features 11
- 1.3 Theory of Operation 13
- 1.3.3 Operational Overview 15
- 1.3.5 Timekeeping 19
- 1.3.6 Drive System 19
- 1.3.7 Polarization Control 21
- 1.3.8 Magnetic Variation 22
- 1.3.9 System Performance 23
- 1.4 Specifications 24
- 2.0 INSTALLATION 25
- 2.1 Equipment Mounting 26
- 2.1.2 GPS Receiver 27
- 2.1.3 Fluxgate Compass 28
- 2.1.4 Electronic Clinometer 30
- 2.2 Electrical Connections 32
- 2.2.1 Power Entry 33
- 2.2.2 Motor Drive 34
- 2.2.3 Drive Sense 35
- 2.2.4 Limit Switches 36
- 2.2.5 Signal Strength 37
- 2.2.6 Navigation Sensors 38
- 2.2.7 Accessories 39
- 2.2.8 RF Autopeak 40
- 2.2.9 Hand Held Remote 41
- 2.2.10 Pulse Sensors 43
- 2.2.11 Remote Control 46
- 2.2.12 Waveguide Switch 47
- 2.2.13 Resolver Inputs 48
- 2.3 Initial Configuration 49
- 2.3.2 Elevation Calibration 51
- 2.3.3 Azimuth Calibration 55
- 2.3.5 Fast/Slow Motor Speed 61
- 2.3.6 Pulse Sensor Checkout 61
- 2.3.7 Drive System Checkout 61
- 2.4 Final Calibration 62
- 2.4.4 Pulse Scale Factors 68
- 2.4.5 Operational Presets 70
- 3.0 DETAILED OPERATION 71
- 3.1 Operation Overview 71
- 3.1.2 Keypad Usage 72
- 3.1.3 Data Entry 74
- 3.1.4 Display Layout 75
- 3.2 Operating Group 76
- 3.2.1 Manual Mode 77
- 3.2.1.1 Heading Fix 79
- 3.2.1.2 Waveguide Switch 80
- 3.2.2 Menu Mode 81
- 3.2.2.1 Deploy 82
- 3.2.2.2 Stow 83
- 3.2.2.3 Locate 84
- 3.2.2.4 Store 92
- 3.2.2.5 Recall 93
- 3.2.2.6 Delete 93
- 3.2.2.7 Position 94
- 3.2.2.8 Settings 97
- 3.2.2.9 Track 98
- 3.2.2.10 Remote 98
- 3.2.2.11 VSAT Mode 99
- 3.3 Programming Group 102
- 3.3.1.1 NORMAL ACCESS ITEMS 104
- 3.3.2 Maintenance Items 126
- 3.3.2.2 Drive Error Resets 128
- 3.3.2.3 Time Maintenance 128
- 3 LETTER TIME ZONE 129
- 3.3.2.5 Limits Maintenance 131
- 3.3.2.8 MOVETO 133
- 3.3.2.10 Shake 135
- 3.4 Alarm Displays 137
- 4.0 TROUBLESHOOTING 139
- 4.1 Limit Switches 139
- 4.2 Motor Drive 140
- 4.3 Automatic Movements 141
- 4.4 GPS 141
- 4.5 Fluxgate Compass 142
- DRIVE BOARD TOP SILK 167
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