大频差长地址码扩频系统快速捕获方案的设计与实现
doi: 10.3724/SP.J.1146.2006.00223
Design and Realization of Fast Code Acquisition for the Large Doppler Offset and Long PN Code Spread Spectrum System
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摘要: 该文基于离散时间信号处理分析了多普勒频移对捕获性能影响的表达式，给出部分匹配滤波器与FFT结合方案的原理。针对大频差长地址码扩频系统快速捕获问题，提出一种采用部分匹配滤波器与FFT结合算法的实现方案，在考虑捕获性能与实现复杂性间的折衷上，具有很好的灵活性。该方案应用FPGA与DSP芯片配合实现，应用结果表明该方案在移动卫星通信和直扩抗干扰通信中具有很好的应用前景。Abstract: Based on the discrete-time signal processing, the representation of Doppler effect on code acquisition performance is analyzed and the principle of combining partial-matched filter with FFT is given in this paper. A fast code acquisition architecture by using partial-matched filter with FFT for the large Doppler offset and long PN code spread spectrum system is designed and realized with FPGA and DSP. This architecture provides a very good trade-off between acquisition performance and complexity. Application results show this architecture is very attractive for mobile satellite communication and DS/SS anti-jamming communication.
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