With the development of satellite remote sensing technology

types and amount of remote sensing datum are increasing rapidly

which put forward higher requirements to data transmission capability.Two schemes are proposed to reduce cache capacity requirements in the buffer capacity restricted condition while designing Advanced Orbit System(AOS) encoding for data transmission.In the first one

the data transmission rate is increased.And in the second

the data interface between compression unit and the AOS encoding unit is designed synthetically and the timing of compressed data output is decentralized so as to reduce the instantaneous data rate of the AOS encoding cache entry.The buffer capacity demands in both schemes are analyzed dynamically using simulation techniques.The results show that each scheme can reduce cache capacity requirements

while the second scheme requires less buffer capacity significantly.The schemes have been applied to the data transmission system products of certain satellite engineering project and have passed flying verifications.The approaches proposed in this paper have a reference value for the follow-up low cost

high rate transmission system applications.