Passive monitoring system of antenna feederOne.System overviewIn
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
characteristicsThe 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
reportsExample: Block diagram of remote data management system of
three-layer four-sided radio and television antenna feeder
systemTwo.System parameter description1.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 ºC2.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: 1
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