Vehicular Auto Deploy Ku-Band 3.0m
Antenna Servo Feedback Tracking System
This vehicular auto deploy Ku-band 3.0m antenna servo feedback tracking system is consist of a single offset 3m antenna, A-E type antenna pedestal, automatic alignment-to-satellite servo system, terminal equipment compartment and EQ240 chassis, etc. Equipped with relevant satellite communication equipments, the antenna vehicle is widely used for emergency communications such as emergency rescue or disaster relief activities. The antenna vehicle is a new generation of satellite communication products with good mobility, duable and steady long distance, cross-country capabilities and other features such as easy deployment , rapid alignment to satellites and good antenna performance.
(1)Offset parabolic with single fold structure, easy for storage;
(2)Mode matching, corrugated horn feed;
(3)A-E type antenna pedestal, lead-screw driven structure;
(4)Reliable control, perfect function;
(5)Electrically adjustable antenna polarization plane;
|
No. |
Items |
Parameters |
|
1 |
Type of antenna |
single offset foldable antenna |
|
2 |
Antenna diameter |
3m |
|
3 |
Weight of antenna |
1 ton（including servo system） |
|
4 |
Antenna mounted on vehicle |
meets the conditions for highway driving |
|
5 |
G/T value |
≥23dB/k |
|
6 |
Voltage standing-wave ratio |
≤1.25：1（Rx、Tx）; ≤1.3：1 （difference side-cut） |
|
7 |
Noise temperature |
≤65K（at 10°elevation） |
|
No. |
Items |
Parameters |
|
1 |
Operational frequency |
Rx：12.25GHz-12.75GHz; Tx：14.00GHz-14.50GHz |
|
2 |
Antenna typical gain |
Rx：≥49.5dBi; Tx：≥50.9dBi |
|
3 |
Sidelobe characteristics |
First sidelobe≤-14dB |
|
4 |
Sidelobe envelope |
conform to CCIR REC.580 |
|
5 |
Antenna noise temperature |
≤39K（at 10°elevation） |
|
6 |
Port-port isolation |
≥35dB |
|
No. |
Items |
Parameters |
|
1 |
Antenna rotation speed |
0.2°/s |
|
2 |
Angle display resolution |
0.1° |
|
3 |
Driving mode |
electrical drive, manual drive |
|
4 |
Indication accuracy |
0.2° |
|
5 |
Antenna pointing range |
Azimuth±45° ; Elevation0°～90° |
|
6 |
Power supply |
600W |
|
No. |
Items |
Parameters |
|
1 |
Insurance accuracy operating |
8 level wind（constant wind 20m/s） |
|
2 |
Dropping accuracy operating |
10 level wind（constant wind 28m/s） |
|
3 |
Stow wind speed |
12 level wind |
|
No. |
Items |
Parameters |
|
1 |
System can stand |
horizontal acceleration：0.4g; Vertical acceleration：0.2g |
|
2 |
Rainfall |
100mm/hr |
|
3 |
Snowfall |
60mm thickness |
|
4 |
Humidity |
0%～100% |
|
5 |
Antenna designing lifetime |
≥ 15 years |
|
No. |
Items |
Parameters |
|
1 |
Max running speed |
80Km/h |
|
2 |
Creep ability |
30° |
|
3 |
Turning radius |
8.2m |
|
4 |
Max braking distance |
10m |
|
5 |
Oil consumption per 100 kilometer |
36L |
|
6 |
Total length of the vehicle |
7000mm |
|
7 |
Total width |
2300mm |
|
8 |
Total height |
3000mm |
|
9 |
Traveling crane angle |
rear overhang angle:26°; front overhang angle:44° |
|
10 |
Total weight of the vehicle |
7000Kg |
The antenna reflector is a single offset parabolic fold structure, radiation diameter is 3m, f/D (focus/diameter)=0.84, offset angle θ0＝33.3°. The antenna reflector is composed of three parts: central plane and left and right sectors. The width of the central plane is 1.8m, the chord height of left and right sectors is 0.6m. Connected by hinges, the central plane and the left and right sectors are foldable and deployable. They can also be fixed after folding and so can withstand the bumpiness and vibrations,gyrations during vehicle traveling; when deployed, the accuracy of the whole reflector can be ensured by pin fixture.
The feed system is composed of corrugated horn, TE21 mode matcher, polarization duplexer, rejection filter and polarization rotation mechanism. An electric polarization rotation mechanism is set for easy adjustment of polarization plane during antenna operation.
The feed support is of portal frame structure and is bonded by channel steel. Its lower end, connected with the antenna back frame, can rotate through coupling shaft, and it can be folded closely to the central part of the reflector when the antenna is in stow. The feed system should be installed on the upper end of the support.
The antenna pedestal is of azimuth-elevation type. The antenna pedestal is consist of azimuth assembly and elevation assembly, and the latter is placed above the former. The azimuth and the elevation drivers are both of lead screw type with features such as good self-lock and wind-resistant capability.
4.4.1 Composition
The servo tracking system is composed of computer and control circuit, driving circuit, angle sensor and encoder, limit protection, polarization control circuit, GPS, electronic magnetic compass, tracking down converter and tracking receiver.
4.4.2 Function
Servo system’s function as follows：
（1）automatic point satellite
（2）step tracking
（3）protection warning
（4）manual control
（5）antenna pointing angle display