扩频体制低轨卫星通信信号捕获与跟踪系统设计

针对扩频体制下低轨卫星信号的捕获及跟踪等系统设计实现问题，根据卫星信号模型进行了捕获及跟踪算法设计，重点对基于快速傅里叶变换的快速捕获算法、锁频环、锁相环和码跟踪环路进行了设计，并进行了工程系统实现。试验验证表明，该系统可以实现码分多址体制低轨卫星信号捕获、跟踪处理，工作性能参数满足系统需求。

Design of a spread spectrum LEO satellite signal acquisition and tracking system

For the acquisition and tracking system design and implementation problem of direct sequence spread spectrum(DSSS) low Earth orbit(LEO) satellite signals,the acquisition and tracking algorithms are proposed based on the satellite signal model.The system design is focused on the fast acquisition algorithm of fast Fourier transform(FFT),the frequency-locked loop,the phase-locked loop and the code tracking loop.The system has been implemented in engineering.The test results show that the system can be used in the acquisition and tracking of code division multiple access(CDMA) LEO satellite signals.The performance parameter satisfies the demands of system.