Vehicular Auto-Deploy 1.2m Ku
Antenna Servo Feedback Tracking System
1. General
The Vehicular “Auto Deploy ” Ku-Band 1.2m Antenna Servo Feedback Tracking System can
be mounted on top of vehicles. The antenna stows when the vehicle is moving and electrically
erect when it is operating. The system features compactness,solidity, light weight, quick to
facilitate operation and so on.
2. Specifications
2.1 RF performance
|
No. |
Items |
Parameters |
|
1 |
Operation frequency |
Rx: 12.2~12.75GHz; Tx.: 14.0~14.5GHz |
|
2 |
Antenna gain |
Rx: GR＝42.1dBi; Tx: GT＝43.2dBi |
|
3 |
Polarization |
Rx./Tx. linear polarization, polarization plane adjustable |
|
4 |
Polarization isolation |
XPD≥30dB (1dB range of main beam); XPD≥35dB (axial) |
|
5 |
Side lobe characteristics |
1st side lobe ≤－14dB; Far side lobe envelop：conform to CCIR REC.580 |
|
6 |
Voltage standing-wave ratio |
1.3:1 (max) |
|
7 |
Feed insertion loss |
0.2dB |
|
8 |
Antenna noise temperature |
Ta≤48K at 10°elevation, on standard environmental conditions |
2.2 Servo performance
|
No. |
Items |
Parameters |
|
1 |
Shaft angle display |
indication accuracy: 0.2° |
|
2 |
Antenna alignment-to-satellite operation |
0.2° |
|
3 |
Antenna pointing range |
azimuth:±180°;elevation: 0°~ 90° |
|
4 |
Antenna rotation speed |
azimuth: 0.2~0.5°/s; elevation：0.2~0.5°/s |
2.3 Environmental conditions
|
No. |
Items |
Parameters |
|
1 |
Operational wind speed |
level 8 |
|
2 |
Stow wind speed |
level 12 |
|
3 |
Operational temperature |
-40∼55°C (outdoor); -25∼50°C (indoor) |
|
4 |
Relative humidity |
5∼100% (outdoor) ; 5∼95% (indoor) |
|
5 |
Vibration condition |
meet the conditions for cross-country driving |
3. Form of Antenna
This is a single offset parabolic antenna with features of unobstructed high efficiency, accurate reflecting surface, compact structure and ease of mounting on vehicles. Polarization isolation degrees satisfy requirements readily with proper use of suitable antenna focus to diameter ratio and mode matching feed technology.
3.1 Antenna parameters
Antenna diameter: D1.2m, focus to diameter ratio=0.65m, focal distance=0.78m
Antenna aperture: ellipse major axis: 1.3m, minor axis: 1.2m
3.2 Feed
The feed system consists of conic corrugated horn, TE21 mode matcher, polarization duplexer, rejection filter, and rotation knuckle. Feed base and electromotive polarization plane adjustment unit can be fixed on the top of feed pole support.
4. Servo System
4.1 Antenna structure
The vehicular 1.2m antenna pedestal adopts azimuth-elevation structure. The azimuth assembly consists of azimuth chassis, azimuth bearing, azimuth turn table, azimuth drive module and azimuth data package. The elevation assembly consists of elevation shaft support lug, elevation riser, elevation drive module and elevation data package.
The structure adopts planetary gearbox and harmonic gearbox with features of small size, light weight, large reduction ratio, high efficiency, high accuracy and low backlash.
4.2 Servo control
The system mainly consists of electronic compass, GPS, computer control unit, frequency-conversion speed-governing driving unit, resolver, shaft encoder and driving motor. Its functions are as follows:
(1) Automatic alignment to satellite
(2) Manual tracking
(3) Angle preset
(4) Program limit
(5) Pointing direction display
5. Antenna Physical Parameters
|
No. |
Items |
Parameters |
|
1 |
Total weight of antenna |
60kg |
|
2 |
Stow height of antenna |
350mm |
|
3 |
Power supply |
50Hz, 220V |
|
4 |
Power |
200W |
6. Photo of Vehicular “Auto Deploy” Ku-Band 1.2m Antenna Station
Vehicular “Auto Deploy” Ku-Band 1.2m Antenna Station