Phased Array Antenna: Advantage, principle and classification
Last month, we posted one of large satellite dish products of 7.3m S/X/Ka Tri-band Full-Motion Antenna, which is to receive S/X/KA frequency band signals of low-orbit satellite. Today let us show you Antesky newly developed of 7.3m L/S Dual-Band Full Motion antenna for LEO and MEO satellite. Please go ahead for detailed introduction.
1. Overview of Antesky 7.3m L/S Dual-Band Full Motion antenna
The 7.3 m L/S Dual-Band Full Motion is used for LEO and MEO satellite active segment measurement and control and service segment signal reception. This article introduces the main functions and technical requirements of the 7.3 mL/S Dual-Band Full Motion antenna system. The antenna photo is shown in below Figure1.
Figure 1 Antesky 7.3M L/S Dual-Band Full Motion Antenna
2.Main functions of Antesky 7.3mL/S Dual-Band Full Motion antenna
2.1 Satellite tracking and receiving specifications
a) Receive control commands and target orbit data files from the station control computer, and drive the antenna to capture and continuously track satellites through servo control equipment;
b) Transmit the status parameters and fault information of the feeder system to the station control computer in real time and display it on its own;
c) Track and receive satellite signals stablyat an elevation angle of 5° without obstruction;
d) Track targets overhead;
e)Monitorand manage automatically, and record antenna point files according to planned time automatically;
f) Automatic tracking, program tracking, data guidetracking, memory tracking, manual tracking, command location, and collection capabilities;
g) Receive data from domestic and foreign LEO, MEOsatellites;
h) Capable of collecting, processing, coordinate transformation, saving and recording, display and sending of real-time angle measurement data;
i) Integrated control and protection interlocking function to ensure the safe operation of the antenna.
j) Operation safety protection functions, security devices such as electrical limits, mechanical buffers, stowlocking mechanisms, emergency brakes, and audible and visual alarms to ensure the safety of personnel and equipment;
k) Presetting the antenna position before the mission and stowautomaticallyafter the mission
3. Main technical specifications of Antesky L/S Dual-Band Full Motion antenna
3.1 Antenna Electrical Characteristics
| Item | Description | |
| Frequency(MHz) | L-band | S-band |
| Rx: 1200~1700 | Rx: 2200~2300 | |
| Gain (dBi) | ≥37.6+20×log(f/1450MHz) | ≥41.5+20×log(f/2250MHz) |
| System G/T (sunny day, light wind, antenna elevation angle more than 5°, ambient temperature 23°C, no radome, LNA input port test) | ≥15.0+20lg(fi/1450MHz)dB/K
(L low noise temperature 50K) |
≥19.0+20lg(fi/2250MHz)dB/K
(S low noise temperature 50K) |
| Polarization: Sum-channel receive | LHCP and RHCP at the same time | LHCP and RHCP time sharing |
| Polarization: Differential-channel receive | LHCP and RHCP time sharing | |
| Circular polarization axis ratio (dB) | ≤2.0 | ≤1.5 |
| First Side lobe | ≤-14dB | |
| Antenna Noise Temperature
(feed output port, ambient temperature 23°C, clear sky, breeze, elevation angle ≥5°) |
≤130K | ≤115K |
| G/T at 5°elevation@ 23°C | ≥19 dB/°K | ≥32dB/°K |
| VSWR | ≤1.50:1 | ≤1.50:1 |
| Difference beam zero depth (Compare with sum beam) | ≥30dB | |
3.2 Antenna Mechanical Characteristics
| Item | Description |
| Antenna Diameter (m) | 7.3 |
| Mount Type | Azimuth-elevation-third-axis (AET) antenna mount |
| Driving Mode | Az Drive: -350°~350°
El Drive: 0°- 180° Tilt Drive:-170~170° (fixed 7° inclination angle) |
| Angular velocity range | 1) AZ: ≥20(º)/s;
2) EL: ≥10(º)/s; 3) Tilt: ≥5(º)/s; |
| Maximum angular acceleration | 1) AZ: ≥10(º)/s2;
2) EL: ≥10(º)/s2; |
3.3 Servo performance specifications
| Item | Description |
| Antenna working mode: | Standby, hand speed, scanning, automatic tracking, program tracking, command position, memory tracking, stow, automatic fast phase calibration (if tracking network and receiver are included); |
| Axis angle resolution | 0.001° |
| Servo bandwidth | 1.0Hz (1±10%) (wideband), 0.6Hz (1±10%) (narrowband) |
| Pointing accuracy | Better than 1/5 half power beam width |
| Tracking accuracy | Better than 1/10 half power beam width |
3.4 Tracking link specifications
| Item | Description |
| Input frequency | 2.2GHz ~ 2.3GHz, step 1kHz |
| Output frequency | 70MHz |
| Tracking system | Single-channel mono-pulse tracking method |
| Tracking signals | Single carrier signals, broadband data transmission signals |
3.5 Interface requirements
| Item | Description |
| S-band feed network and S LNA interface | 1) Interface form: SMA-K;
2) Number of interfaces: 2; 3) Interface function: realize the transmission of S-band sum and differential RF signals.
|
| L-band feed network and L LNA interface | 1) Interface form: N-50K;
2) Number of interfaces: 1; 3) Interface function: realize the transmission of L-band RF signals |
3.6 Monitoring interface
| Item | Description |
| Communication interface with monitoring subsystem | a) Interface type: 1Gbps network interface is used for communication , standard RJ45 network port;
b) Cable: Category 5 twisted pair; c) Number of interfaces: 1; d) Interface function: 1) The monitoring subsystem sends control information to the antenna control unit control software: including mission plans, tracking forecast files, scheduling commands, etc.; 2) The antenna control unit control software sends real-time angle data, working status and equipment monitoring information to the monitoring subsystem. e) Data network: local monitoring network. |
3.7 Power supply interface
| Item | Description |
| Interface with power supply system | a) Three-phase four-wire alternating current, suitable for mains power supply and oil machine power supply;
b) Voltage: 380×(1±10%)V, 220×(1±10%)V; c) Frequency: 50 (1±5%) Hz.
|
- General quality characteristicsof Antesky 7.3M L/SDual-Band Full Motion antenna
| Item | Description | |
| Reliability | a) MTBF: ≥800h;
b) MTTR: ≤0.5h.
|
|
| Environmental adaptability design | Ambient temperature requirements | 1) Working temperature: -40℃～+60℃ (outdoor equipment), -10℃～+40℃ (indoor equipment);
2)Transportation and storage temperature: -55℃～+70℃; |
| Environmental humidity requirements | 1) Indoor working humidity: 0% ~ 80%;
2) Outdoor working humidity: 0% ~ 100%; |
|
| Wind resistance requirements | 1) Level 8 wind precision-guaranteed work;
2) Level 12 wind will not cause damage; |
|
| Other environmental requirements | It has the ability to resist corrosion, mildew, moisture, rain, rats and insects. | |
| Color | The appearance color of the equipment is white (should comply with the requirements in GB/T 3181-2008 “Paint Film Color Standard”) or as required by the contract. | |
| Logo | This product is equipped with a metal nameplate, which includes:
a) Equipment name; b) Manufacturer’s name; c) Manufacturing number and date of manufacture. |
|
| Appearance quality | The appearance of the product should be free of rust, mildew, stains, coating peeling, and obvious scratches and burrs; plastic parts should be free of blistering, cracking, deformation, and pouring materials should be free of spillage; words, symbols, signs, and Various displays should be clear; structural parts and control components should be intact without mechanical damage; packaging boxes and equipment structures should be free of damage, deformation, and looseness. | |
- Equipment listof Antesky 7.3mL/S Dual-Band Full Motion antenna
The equipment list of the 7.3-meter L&S band earth station antenna antenna system is shown in Table 1.
Table 1:7.3m L& S band earth station antenna system equipment list
| No. | Sub-item equipment name | QTY | unit |
| 1 | Antenna feed extension | ||
| 1.1 | L/S band feed network | 1 | set |
| 1.2 | S mono-pulse tracking network | 1 | set |
| 1.3 | S sum polarization switch | 1 | set |
| 1.4 | S differential polarization switch | 1 | set |
| 1.5 | Connection wave guide and RF cables within the feed | 1 | set |
| 2 | Mechanical structure extension | ||
| 2.1 | 7.3m antenna reflector | 1 | set |
| 2.2 | Sub-reflector support structure | 1 | set |
| 2.3 | Antenna hub, back frame, feed sleeve | 1 | set |
| 2.4 | AZ+EL+tilt axis mount | 1 | set |
| 2.5 | AZ+EL+tilt axis transmission device | 1 | set |
| 2.6 | AZ+EL+tilt axis reduction gearbox | 6 | set |
| 2.7 | AZ+EL+tilt axis slew bearings | 1 | set |
| 2.8 | Shaft angle resolver device | 3 | set |
| 2.9 | AZ motor | 2 | pc |
| 2.10 | EL motor | 2 | pc |
| 2.11 | Tilt motor | 2 | pc |
| 2.12 | Cable winding device | 1 | set |
| 2.13 | Control and protection devices (aviation lights, electric limits, etc.) | 1 | set |
| 2.14 | Antenna foundation embedded parts | 1 | set |
| 3 | Servo extension | ||
| 3.1 | Antenna control unit ACU | 1 | set |
| 3.2 | Display monitor, keyboard and mouse | 1 | set |
| 3.3 | Antenna drive unit ADU | 1 | set |
| 3.4 | position encoding unit PEU | 1 | set |
| 3.5 | Polarization control unit PCU | 1 | set |
| 3.6 | IRIG-B(DC) code board | 1 | set |
| 3.7 | remote control unit | 1 | pc |
| 3.8 | Servo cables and connectors | 1 | set |
| 3.9 | Cabinet | 1 | set |
| 4 | Tracking device | ||
| 4.1 | S-band phase-shifting synthesis network | 1 | pc |
| 4.2 | S-band down converter tracker | 1 | pc |
| 4.3 | tracking receiver | 1 | pc |
| 4.4 | tracking device cables | 1 | set |
| 5 | Accessory equipment | QTY | unit |
| 5.1 | L band LNA | 2 | pc |
| 5.2 | S band LNA | 2 | pc |
| 5.3 | LNA power supply unit | 1 | pc |
| 5.4 | Special maintenance tools | 1 | set |
| 5.5 | lightning rod , lightning cable | 1 | set |
Above is about the brief introduction of Antesky 7.3m L/S Dual-Band Full Motion antenna. If you are interested in this product as well, please contact with Antesky at sales@antesky.com. Or you can WhatsApp here directly. We can offer other dual band or tri-band antenna as well, please click this product page to learn further. Thanks！
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