高动态接收机的多普勒频偏捕获新算法

为了解决高动态接收机长时间信号累积导致的能量扩散问题,提出一种基于迭代搜索范围校正的多普勒频偏捕获新算法.根据接收信号连续性特点,首先,单次校正算法利用前两个累积周期内的估计结果来校正第3个累积周期内估计结果的搜索范围,并分析了搜索范围大小对捕获概率的影响;然后,迭代校正算法采用一种多个单次校正级联的方式来逐步缩小多普勒搜索范围,从而进一步提高多普勒捕获性能并得到捕获概率的上界值.仿真计算结果表明,该算法可以通过校正搜索范围来提高多普勒捕获概率.

New Doppler frequency-shift acquisition algorithm for high dynamic receivers

To address the energy dispersion problem caused by the long time signal combination for high dynamic receivers, a new Doppler shift acquisition algorithm based on the iterative searching range correction (SRC) is proposed. Considering the received signal's continuity property, first, the single SRC algorithm uses the two Doppler estimation results obtained in the previous two combination periods to correct the third combination period's searching range for the third estimation result and analyzes the influence of the searching range's size on acquisition probability, and then, iterative SRC algorithm adopts cascaded multiple single SRCs to gradually narrow the Doppler searching range, thus increasing the Doppler acquisition performance furthermore with an upper bound on the acquisition probability with the iterations. Effectiveness of this proposed algorithm is verified by simulation results.