突发通信的捕获算法需要关注三个方面,一是捕获速度要快,二是扩频增益损失要小,三是硬件规模要小。根据这些需求,设计了使用FFT并行搜索码相位,使用乒乓加速搜索频率差的算法架构。对工程应用中码相位搜索和频率差搜索的步进值进行了分析,捕获速度相比不做硬件加速提升了64倍,扩频增益损失仅为1.58 dB,硬件消耗仅约200个乘法器。在FPGA平台上结合射频系统验证了该算法的有效性。该架构可以在捕获后继续微调频偏搜索和数据段截取,同样适用于长时间通信系统。%Acquisition algorithms of burst communication need to focus on three aspects, firstly quick cap-ture speed, secondly small spread gain loss, thirdly small hardware size. According to these requirements, FFT is designed to search code phase in parallel and Ping Pong algorithm is used to speed up the search of frequency difference. The step value of code phase search and frequency difference search in engineering application is analyzed, and the acquisition speed is 64 times faster than that of no hardware acceleration, with the gain loss only 1. 58dB and the hardware consumption about 200 multipliers. The effectiveness of the proposed algorithm is verified on the FPGA platform with RF system. The architecture could continue to fine tune the frequency offset search and data segment interception, and also suitable for long time com-munication system.
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