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针对长周期伪码扩频信号的捕获问题,分析了局部相关的码相位空间捕获模型和FFT实现方法.为了能够对数据处理任务进行分割处理,充分利用GPU加速FFT运算,本文研究了部分重叠局部相关长码直接捕获算法,提出了基于GPU的全局直接搜索和分段重叠搜索长码直接捕获方法.该方法利用FFT并行搜索伪码相位,在GPU中批处理加速FFT运算.实验结果表明,相比CPU实现的方法,基于GPU的长码直接捕获方法显著提高了捕获速度.
In order to capture the long-period pseudo-code spread spectrum signal, the local correlation code phase space capture model and FFT realization method are analyzed.In order to be able to segment the data processing tasks and make full use of the GPU-accelerated FFT operation, this paper studies the partially overlapped local The direct long code direct capture algorithm based on GPU is proposed.The direct search method based on GPU for global direct search and segment overlapping search is proposed.It uses FFT to search the pseudo code phase in parallel and accelerates the FFT operation in GPU.Experimental results show that phase Compared with the method implemented by the CPU, the GPU-based long code direct capture method significantly improves the capture speed.