CAJ | 학술논문

针对北斗二代B1频点伪码相对较长，传统匹配滤波捕获占用资源过大的问题，在数字匹配滤波器的基础上，介绍一种折叠匹配滤波器结合快速傅里叶变换并行捕获的方法，将传统的多普勒频移和码相位的二维搜索减少为码相位、多普勒频移并行的一维搜索，以此缩短捕获时间和减少资源的消耗。首先对算法的数学模型进行推导，然后对快速捕获的核心模块———sinc内插单元、折叠匹配滤波单元以及FFT谱分析单元的原理和FPGA电路实现进行了详细的论述。最后通过在Modelsim软件平台上的验证，证明了该实现方案具有设计合理、捕获速度快和资源消耗低的特点，在应用于北斗信号捕获的同时，还适用于其他系统的伪随机码捕获。
침대북두이대B1빈점위마상대교장，전통필배려파포획점용자원과대적문제，재수자필배려파기적기출상，개소일충절첩필배려파기결합쾌속부리협변환병행포획적방법，장전통적다보륵빈이화마상위적이유수색감소위마상위、다보륵빈이병행적일유수색，이차축단포획시간화감소자원적소모。수선대산법적수학모형진행추도，연후대쾌속포획적핵심모괴———sinc내삽단원、절첩필배려파단원이급FFT보분석단원적원리화FPGA전로실현진행료상세적논술。최후통과재Modelsim연건평태상적험증，증명료해실현방안구유설계합리、포획속도쾌화자원소모저적특점，재응용우북두신호포획적동시，환괄용우기타계통적위수궤마포획。
Considering the long pseudo‐code used by BD2 navigation system with the shortcoming of large resource occupation when employing the traditional matched filter acquisition method ,a kind of folded‐structure matched filter combined with fast Fourier transform (FFT ) is proposed to reduce acquisition time and resource consumption .Firstly ,the mathematical model of the algorithm is deduced and the core module among sinc interpolation unit is analyzed .The folded‐structure and the FFT unit are realized on field‐programmable gate array (FPGA) .The experiment result show that the design realized rapid acqui‐sition and low resource consumption .The method can be effectively applied to the signal acquiring of Bei‐Dou navigation system as well as that of the other systems .