Abstract: Aiming at the low order Constant Coding and Modulation（CCM） in traditional remote sensing satellite transmission system and the problem that unable feedbacking the channel state to transmitting terminal timely, this paper introduces the variable rainfall loss margin method to the link budget and solves the problem that remote sensing data signal is seriously affected by rainfall attenuation. The Adaptive Coding and Modulation（ACM） technology in second generation digital broadcast television（DVB-S2） and the Return Channel via Satellite（RCS） technology in digital broadcast television based on RCS are adopted in the proposed method. Analysis results indicate that the data transmission of variable rainfall loss margin improves by 1.21 times than that of traditional constant rainfall loss margin and 2.01 times than that of CCM. Finally, the remote sensing data transmission system based on RCS is simulated by the Satellite Tool Kit （STK）, and the simulation results from the channel return way, delays and rainfall attenuation prepare margin aspects confirm the correctness and effectiveness of the proposed method.

Key words: Adaptive Coding and Modulation（ACM）, Return Channel via Satellite（RCS）, rainfall loss margin, Quality Of Service（QoS）, Sensing Satellite（RS）, Satellite Tool Kit（STK）

摘要： 针对传统遥感卫星传输系统中采用低阶固定调制编码（CCM）以及不能及时将信道状态反馈给发送端的问题，结合第二代数字广播电视（DVB-S2）的自适应编码调制（ACM）技术和基于卫星回传信道的数字广播电视（DVB-RCS）中的RCS技术，将其应用在遥感卫星传输系统中。同时，针对遥感数据信号受雨衰影响严重的问题，将可变降雨备余量的方法引入到链路预算中，分析结果表示，与传统固定降雨备余量相比传输数据量提高了1.21倍，与CCM相比提高了2.01倍。通过卫星工具包（STK），对基于RCS的遥感数据传输系统进行了模拟过境回传仿真，分别从信道回传方式、延迟以及雨衰备余量三个方面进行了分析，仿真结果验证了方案的正确性和有效性。

关键词: 自适应编码调制, 卫星回传信道, 降雨备余量, 服务质量, 遥感卫星, 卫星工具包