Based on the national demand and status quo of China’s satellite communications development, the paper puts forward the way of constructing a national emergency satellite communications net in China, and elaborates the system structure and requirements for emergency satellite communications net.

Simulation results show that the proposed method is of value for engineering application in satellite communication systems.

Research on GMDSS satellite communication system simulator based on Visual C~#.NET;

A further analysis was made on the rain attenuation char-acteristic of the Ka band satellite communication system by integrating with the landform and the climate distribution pattern in our country.

A design method for implementing regional coverage satellite communication system with medium earth orbit(MEO)common-track constellation(CTC)was studied.

Jamming analysis based on a certain satellite communication system;

In order to reduce the influence of rain attenuation on the quality of signal transmission in Ka band satellite communication(30GHz/20GHz),an improved method of Open-Loop Uplink Power Control was presented in this paper,that is to add a revised parameter in the method of Power Control,which can improve the predicted precision of rain attenuation of uplink.