IPSTAR系统由IPSTAR号卫星、地面业务关口站和小口径天线地面终端组成。本文通过建立调制方式模型和高斯信道模型，分析卫星信号信噪比及传输性能，对比信噪比不同的星座图，分析卫星通信系统使用QPSK调制方式调制、传输地震数据对信号的影响，为使用卫星通信系统传输地震数据提供了理论依据。

Consisted of the IPSTAR satellite, terrestrial service gateways and small diameter antenna terminals, the IPSTAR system is an all-IP based broadband satellite system. By modeling and emulating of the modulation and transmission of satellite signals on Gaussian channels, the present paper analyzed the SNR and the performance of transmitting seismic data with a satellite system, compared constellation of transmission data at various SNRs and analyzed the impacts on signal of modulating and transmitting seismic data with QPSK Modulation in a satellite system, to provide a theoretical basis for transmission of seismic data with a satellite system.