Passive monitoring system of antenna feeder
One.System overview
In the information age, "big data, cloud platform, Internet of Things+" and others quietly appear around us. We should make good use of these resources to provide safe broadcasting services for radio and television transmission equipment.
In radio and television wireless transmission equipment, especially the equipment of wireless transmission antenna feeder system is highly required. Ensure safe, reliable and high-quality broadcasting, without failure, suspension and safety accidents. How to remotely detect, monitor and supervise the radio and television wireless transmission antenna feeder system is particularly important.
At present, the radio and television antenna feeder system of wireless transmission is still only relying on regular inspection to ensure the basic safe broadcasting of the entire transmission system, which cannot fully meet the requirements of all-weather safe broadcasting put forward by the State Administration of Radio, Film and Television. In order to transform the antenna feeder system from regular patrol inspection to real-time monitoring, the company, in conjunction with universities in Nanjing, has done a lot of research on the signal acquisition of passive equipment of radio and television antenna feeder system, especially on the detection, monitoring, data transmission, real-time alarm, fault analysis and other research of antenna feeder system equipment, and has achieved remarkable results.
In the radio and television transmission antenna feeder system, our company installed directional coupling probe sensor at the connection of the main feeder and power divider, and the connection port of the power divider and the branch feeder to collect the incident and reflected power signals, and the collected signals are transmitted to the network system through 485 communication (or wireless signal transmission), so that the staff can realize remote monitoring data in the machine room.
In the radio and television antenna feeder remote data monitoring management system, detection equipment is installed between each node of FM and TV multiplexer, electric switch board and main feeder, main feeder and power divider, feeder distributor and antenna unit board to ensure that input power, reflected power, standing wave ratio and other working conditions can be detected on each node, and the working conditions of each node are monitored by sound, light and electricity, Anticipate the possible faults of the system equipment in advance, accurately judge the fault points, and timely solve the fault problems, so as to ensure the safe broadcasting of the antenna feeder system.
When the system is abnormal, the signal acquisition system will realize intelligent early warning and alarm, so that the equipment fault can be found in time when the initial abnormality occurs, repaired in advance, and will not be handled until the equipment fault expands, so as to avoid major broadcast accidents such as broadcast suspension.
After many tests, the radio and television passive monitoring system developed by the company is generally used for real-time monitoring of various wireless transmission antenna and feeder systems such as medium wave, short wave, FM, meter wave, decimeter wave, mobile communication, etc.
1.System characteristics
The system monitors the input power, reflected power and standing wave ratio at the antenna unit board, power divider and antenna feeder on the transmission tower through data acquisition and analysis, and displays them on the display in a more intuitive way of data and graphic visualization. At the same time, it can also realize the functions of historical data analysis, alarm, record query, remote monitoring, etc.
2.System core business
(1)Realize the temperature and humidity data acquisition and visual display of the signal return system;
(2)Realize data acquisition and visual display of incident power, reflected power and standing wave ratio of each antenna in the signal collector;
(3)Realize the alarm function when the data is abnormal, and generate alarm records for retention;
(4)It supports viewing historical data records in the form of graphs and data reports
Example: Block diagram of remote data management system of three-layer four-sided radio and television antenna feeder system
Two.System parameter description
1.Technical parameters of power monitoring equipment software:
(1)Frequency range: 500KHz-3GHz
(2)Power range: 1W~100KW
(3)Display resolution: 1W
(4)Measurement error: 10% (full scale)
(5)Temperature range: - 40 -+80 ºC
2.Antenna feeder detection system function
(1)Detection of incident power, reflected power, standing wave ratio, temperature and humidity
(2)The standing wave threshold can be set. When the standing wave of the main feeder is greater than 1.4, the acoustic, optical and electrical alarms will be given. The standing wave of the unit board can be set according to the actual requirements.
(3)Display resolution: 1W, measurement error: 10% (full scale).
(4)umber of detection channels: 1-27 channels (more than 100 channels can be expanded); Each output line of 4-6 core socket is incident, reflection, temperature and humidity, positive pole of power supply and negative pole of power supply; When it is less than 2 channels, it can run automatically. The device does not display when there is no input.
(5)Multi-channel power output is connected to the hub through cable, and the hub output 485 (or optical fiber) is connected to the computer room PC.
(6)Display: It can be compatible with touch screen, notebook and PC display. Display: incident power, reflected power, standing wave (when the standing wave is greater than the set threshold value, the acoustic and optical alarm); Temperature and humidity; The display time can be set.
(7)For demonstration: display 1~2 channels of incident power; 1~2 channels of reflected power; Standing wave, temperature and humidity.
(8)The upper computer display page can be single or multiple selected to monitor the connection between the main feeder and the power divider and the antenna unit board.
(9)Develop the upper computer antenna power management software package, display and process data information in real time, and send out, run and alarm in time.
(10)Management software package: the operation record of each antenna should have power statistics days, days, months, and years, which are automatically recorded (in the currently compiled interface, the functions under the interface, and refer to the industrial control management package).
3.Main product technical parameters
(1)Technical parameters of antenna unit signal collector
Output impedance: 50 Ohms
Acquisition interface: IF45-50JF (branch interface); IF110-50JF (main feeder interface); Ф 80- Ф 120 (multiplexer interface)
Signal interface: N head
Incident signal: - 50db (± 0.5db)
Reflected signal: - 80db (± 0.5db)
Signal interface: N head
Waterproof treatment: 4 layers of waterproof treatment
(2)Technical parameters of antenna signal processor
Interface: 4-6 core waterproof aviation plug
Power supply voltage: 24V DC safety voltage, power: ≤ 5W
Ambient temperature: - 40 ºC~80 ºC
Ambient humidity: 5-95%;
Control: network control;
Input signal: - 60~+5dbm;
(3)Technical parameters of antenna signal transmitter
Output impedance: 50 Ohms
Signal interface: N head
Transmission cable: anti-corrosion, anti-aging, low-loss cable
Power supply voltage: 24V safety voltage
Working temperature: - 40 ºC~80 ºC
Ambient humidity: 5-95%
Waterproof treatment: 4 layers of waterproof treatment
(4)Technical parameters of antenna signal controller
Hard disk interface type: SATA
Hard disk capacity: ≥ 2T
Memory: 2 * 4GB
Display: 19-inch LCD screen
CPU parameters: six-core Xeon E5-2600V3 or above
Number of CPUs: 1
(5)Data transmission cable
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