Metso D200175 accumulate detection data,

Metso D200175 accumulate detection data,

Metso D200175 accumulate detection data,

The scientific research work on shortwave communication and real-time frequency selection in China can basically track the latest international levels. The short wave frequency management and prediction system, jointly completed by the 7th Institute, 713 Factory, and 22nd Institute of the Ministry of Electronics during the “Eighth Five Year Plan” period, marks a new step forward for China in this field. This system has shown great superiority in practical applications. The vast territory and sea areas of our country will inevitably demand more and higher demands for shortwave communication. During the Ninth Five Year Plan period, the Seventh Institute of the Ministry of Electronics took on the task of “communication frequency management”. After the completion of this task, the real-time frequency selection of shortwave will be improved to a new level, and a wide range frequency management will be carried out for the frequency range of 300kHz to 2000MHz.
2、 Basic principles of shortwave frequency management
The Chirp shortwave frequency management and prediction system consists of a detection transmitter, a detection receiver, a spectrum monitor, and a frequency management terminal. Each detection receiver can receive signals from three transmitters.
This system can conduct real-time detection of the ionosphere, accumulate detection data, and dynamically manage shortwave frequency resources in real time; Having the networking function of three transmissions and one reception; It has real-time, short-term, and long-term frequency prediction functions. Real time prediction is the sorting and optimization of frequencies based on the signal-to-noise ratio and delay dispersion values detected in real time, in order to provide the optimal communication frequency for shortwave trunk communication. In addition, high-quality communication frequencies can also be provided for shortwave communication beyond the detection circuit.