Antesky 7.3m L-band Rx Only System For Weather Antenna

The main function of the Antesky 7.3m L-band Rx Only System For Weather Antenna is to receive weak signals in the 1670 to 1710 MHz band.In order to ensure signal quality, the antenna system needs to have high efficiency and low noise temperature, so as to effectively complete the reception of the RF signal.

In addition, when the satellite drifts in the synchronous orbit, the antenna’s electric axis deviates from the satellite, which will cause the antenna gain to decrease. Moreover, due to the influence of wind, rain, snow and temperature, the antenna’s electric axis will also deviate from the satellite, which will reduce the receiving gain. A good tracking control system can accurately ensure that the antenna beam is accurately aligned with the satellite to ensure signal reception at any time under the interference of satellite drift and environmental conditions.

The antenna system has various working modes such as step tracking, program tracking, and manual control.

The main function of the antenna is to align the satellite and stabilize the tracking, and receive the data signal transmitted by the satellite.

The antenna can be used for tracking and receiving satellites in both the planned mode and the manual mode. Among them, the planning mode is the main application mode, and the manual mode is mainly used in the case of maintenance commissioning and emergency.

Planning mode workflow

The planning mode workflow is an automatic workflow, and the antenna system automatically performs tasks according to the station control mission plan.

1) The station management subsystem formulates a task receiving plan. According to the time list, the management software separately issues control commands of the corresponding devices according to the IP addresses of the respective devices, and completes parameter setting for each device;

2) After obtaining the control command, the antenna controller controls the antenna to complete the positioning of the 7.3-meter antenna azimuth, elevation, and polarization axes;

3) During the execution of the task, the antenna controller switches to the program tracking according to the control computer settings, and completes the star and data reception.

Manual mode workflow

Compared with the automatic workflow, the manual mode is based on the task plan and tracking parameters issued by the station control computer, and the operator completes the star and tracking.

1) Manually complete the loading of satellite data, the preset position of the antenna and the setting of parameters before the task is executed;

2) After the mission starts, the satellite is captured according to the satellite orbit data, and after the signal is captured, it is transferred to the tracking;

3) During the tracking process, the antenna controller can be operated according to the actual situation to switch the working mode of the subsystem;

4) After the mission is over, the antenna goes to standby.

The design of the star receiving process follows the hardware device interface and technical indicators, and optimizes the upgrade based on the user or overall usage.

Antesky 7.3m L-band Rx Only System For Weather Antenna has the following main technical features:

Adopting a ring-focus antenna, the structure is compact, and the feed-back can reduce the size of the connecting cable, and install a high-frequency box for the center body.The parts are convenient and easy to feed maintenance;
The antenna and the frame structure have high strength, complete safety measures, mature and reliable solutions, and have been successfully used in many projects;
The antenna control unit (ACU) has flexible control mode, friendly man-machine interface and convenient operation and use. ;
The angular coding unit adopts stereotyped products with mature technology and high coding precision;
The antenna system has the functions of local control and remote control, automatic control and management functions, self-diagnosis and alarm functions.

The external interface includes an interface with the monitoring subsystem and the receiving subsystem.

Feed and L-band LNA interface: N-50K;
Antenna control unit and host computer interface: RJ485 network interface.

Antesky 7.3m L-band Rx Only System For Weather Antenna

Fig1 Antenna control subsystem block diagram

Specification for Antesky 7.3m L-band Rx Only System For Weather Antenna

ELECTRICAL SPECIFICATION
Diameter	7.3M
Operating Frequency, GHz	L-Band
	Receive
	1.67～1.70GHz
Gain, Mid-band, dBi	≥39+20log(F/1.69)dBi
Polarization	Linear
XPD (on Axis), dB	≥30dB
Antenna Noise Temperature 10° Elevation	≤55K
G/T value (20°EL, normal temperature clear sky)	≥18.5dB/K
Radiation Pattern:First Sidelobe	≤-14 dB
MECHANICAL SPECIFICATION
Antenna Type	Parabolic antenna
Antenna Pedestal Type	Az/El type
Surface treatment	Steel structural parts; thermal spray zinc; panel,white painting
Travel rate	El:≥0.05°/s
	Az:≥0.05°/s
	Pol.≥0.02°/s
Travel range	El range: 5°- 88°(continuous)
	Az range:±85°
	±90°
Drive mode	Motorized(AC 220±10%; 50Hz±5Hz, Power≤5KW)
Drive speed	≥0.05°/s
Tracking accuracy	≥1/6 beamwidth
Tracking sensitivity	≥0.5dB
ENVIRONMENTAL SPECIFICATION
Operational Wind	Steady wind 20m/s; gusting 27m/s
Survival Wind	56 m/s
Temperature	Outdoor: -40°C-+50°C Indoor: 0°C-+30°C
Relative Humidity	Outdoor: 10%-100% Indoor: 10%-90%
Snow and rain full	Rainfull: 100mm/h Snowfull: 60mm thickness
Ice&snow loading	13m ice: normal operation 25 mm ice: survival operation
Seismic (Survival)	0.3g (H), 0.15g (V)
Solar radiation	100kcal/m²/h
Life time	≥15 year
OTHER SPECIFICATION
Axial angle display resolution	0.01°
Pointing accuracy	≤0.1°
Servo control drive mode	Manual drive, pointing, program tracking,look angle, standby
Remote control interface	RJ485 network interface
Timing system, timing accuracy	10ms/month
When wind speed is 37m/second, Gain loss do not exceed 1dB When wind speed is 28m/second,Gain loss do not exceed 0.5dB