CAJ | 학술논문

　　在高灵敏度卫星导航接收机技术中,微弱信号捕获算法的捕获效率和运算复杂度是提高接收机灵敏度的关键.长时间相关积分是提高灵敏度的经典方法,但由于导航数据比特翻转的限制,一般积分时长为10ms.提出逐层分组数据相干积分,利用二分法估计比特翻转位置,可将累积时长扩展为19ms,从而提高捕获效率.同时根据卷积的线性关系,利用特定时间的数据累加替代卷积运算,从而降低相关积分的运算复杂度.理论分析和仿真结果表明该算法在提高接收机灵敏度的同时,有效降低了运算量.
　　재고령민도위성도항접수궤기술중,미약신호포획산법적포획효솔화운산복잡도시제고접수궤령민도적관건.장시간상관적분시제고령민도적경전방법,단유우도항수거비특번전적한제,일반적분시장위10ms.제출축층분조수거상간적분,이용이분법고계비특번전위치,가장루적시장확전위19ms,종이제고포획효솔.동시근거권적적선성관계,이용특정시간적수거루가체대권적운산,종이강저상관적분적운산복잡도.이론분석화방진결과표명해산법재제고접수궤령민도적동시,유효강저료운산량.
For the navigation satellite receiver technology, the weak signal acquisition is the key to improve the receivers' sensitivity. According to the characteristics of the weak signal, long duration correlation integral is the classic method. Unfortunately, the duration is always limited to 10ms for that navigation bit rate is 50bps. In this paper, a dichotomy-based acquisition algorithm is proposed to extend integration duration to 19ms. Meanwhile, to reduce its computation complexity, the convolution operation is replaced by summation for its potential linear relation in the special time. Theoretical analysis and simulated result proves that the proposed algorithm can improve receivers' sensitivity and reduce its computation.