Foreword
Data transmission is telemetered seismic network is stable, reliable and key technologies. Accurate measurement of seismic data from seismic stations need to get. Established practice, mostly away from the seismic station network centers, some located in remote mountainous areas, desert island, it must be set according to the actual situation due to appropriate choice of communication.
Communication simply divided into wired and wireless are two kinds of cable, including cable, fiber optic cable, general wire, divided into short-wave radio / FM radio, satellite, GSM / CDMA systems. Compared to wireless susceptible to environmental, weather and other air radio propagation disturbances, and large capital investment in building wire, a long time. China Telecom DDN leased line is a time-saving solution to save trouble, but operating costs are too high. In actual construction, use and reliable, anti-interference ability, communication distance, cheap FM radio, will bring more convenience.
Main features Digital Radio
Shenzhen Huaxia Sheng's family of digital radio telemetry remote control using digital signal processing, error correction coding, software radio, digital modem and an integrated design, surface mount technology, high performance, high reliability features, radio, data port 232 can provide standard directly with the computer, seismic data acquisition, RTU data terminal, GPS receiver, digital camera connection, transfer rate up to 19200bps, BER less than 10E-6 (-110dBm), the transmission power 0.5-25 watts adjustable, any model radio can be set as master or remote station use, transit-free communication distance of 70 km, able to adapt to the harsh indoor or outdoor environment. Radio data and voice compatible, can work in simplex, half duplex, time division duplex TDD, full-duplex mode, receive the same frequency or different frequency transit network, and with remote diagnostics, testing, regulatory functions, to meet the Earthquake Remote Sensing network Center with a number of remote stations for data acquisition and control.
1, high targets: transfer rate up to 19200bps, continuous radio transmitter work
High sensitivity low error-111dBm (BER <10E-6), 70 km transmission distance
Conversion transceiver is less than 3ms
Low power consumption: <18mA (sleep mode)
2, high reliability: the use of digital signal processing, digital modulation, error correction coding, SMT design the most advanced technology integration
Temperature / Humidity:-400C ~ 700C/95%
Power supply voltage: 10.5 ~ 25VDC
3, network management: remote station status (voltage, temperature, error, power, receive power equal) Remote Monitoring
Remote Radio Alarm (low voltage, power, temperature, do not match, etc.) Remote Tips
Remote radio parameters (data rate, transmit power, etc.) remote settings
The whole family / support the use of flexible: 230M/350M/400M/800M/2.4GHz have (used respectively mountains, plains, sea, cities and other geographical) / simplex units, duplex units, complete hot backup sets (with the manufacturers of seismic data acquisition system, RTU, PLC, FTU, etc. can be connected directly)
Example of using digital radio network
Depending on local conditions, you can set up the whole wireless, wireless and DDN some extension of long-distance relay, transmission of telemetry station network.
1.Wireless telemetry station network
2.Part of the wireless telemetry station network
DDN extended transmission telemetry station network
Distance relay type (multi-point after collection sink) transmission telemetry station network
Integrated transmission of telemetry station network room
Some users
Uzbekistan, Guangdong Seismological Bureau, Seismological Bureau of Shaanxi, Liaoning Seismological Bureau, Seismological Bureau of Shanghai, Jiangsu Seismological Bureau, Seismological Bureau of Ningxia, Gansu Seismological Bureau, Seismological Bureau of Shandong, Qinghai Seismological Bureau.
