The invention relates to a
satellite post-compensation
system based on the P2P technology, which is a
satellite file transfer system for which such technologies as the
network communication (
satellite network, Internet) technology, the Dot Net frame, the P2P technology, the file
compensation algorithm, the
data identification perfection, the addressing technology, etc. are utilized. The
satellite network is utilized as a
trunk transmission network to transmit the large-scale
mass file data. By combining the advanced Dot Net frame and the P2P technology over
the Internet, the defect calculation analysis and the compensation are applied to the file received through the satellite transmission so as to ensure that the unreliable satellite unidirectional
file transfer is changed into the reliable integral
file transfer. The traditional compensation solution is divided into the pre-compensation and the post-compensation. The pre-compensation means that a certain proportion of data is repeatedly transmitted through the
satellite network, however, the pre-compensation reduces the efficiency of the satellite communication. In the post-compensation, the requirement for ground
data transmission can be met only by establishing a large amount of
data node servers, which cause the cost of the entire
system to be excessively high. The invention breaks through
the Internet transmission restriction applied to the traditional post-compensation and reduces the number of the ground
data node servers so as to greatly lower the system cost and enhance the compensation speed of the ground network and the utilization ratio of the network resources, and constructs an effective post-compensation system for satellite file transfer with a lower cost.