The result of studies shows that the effect of Doppler shift plays a major role for satellite-based AIS communication,while the ionosphere and weather affect the communication very little.

This paper introduces the concept of satellite detection of AIS messages, analyzes the differences between Satellite AIS and LRIT from the aspects such as message content, interval, data reliability etc, put forward the route we can follow to develop this technology, and analyzes the significance for our country to develop the technology.

The universal ship-borne Automatic Identification System (AIS) used SOTDMA in the VHF maritime mobile band modulated by GMSK to send and receive the static and dynamic information of the vessel which could greatly improve the safety and efficiency of the navigation.

A Phase History Modeling Method for High Resolution Spaceborne SAR;

Research on the spaceborne SAR countermeasures;

The suppression jamming effect on spaceborne and airborne SAR is calculated and analyzed by simulation.

Compression Technique for onboard CCD Image of Space Solar Telescope;

There is much higher fault ratio to onboard system than other computer systems working on ground because of its bad working environment.