双块零扩展截断相关的长码信号快速捕获算法

针对长周期伪码捕获引发的军事通信信号捕获速度受限、效率低等问题，从时域快速捕获角度出发，提出了一种双块零扩展截断相关的长码信号快速捕获算法。该算法利用复序列频谱的非对称性进行截断预处理；结合双块零扩展与圆周移位进行分块相关以减少运算量，提高捕获速度；采用能量补偿改善环境适应性，从而有效实现二维快速捕获。仿真结果表明，新算法的捕获速度及环境适应性优于传统的时域捕获算法。

A Fast Acquisition Algorithm with DBZP Truncation Correlation for the Long Code Signal

The acquisition speed and efficiency of military communication signal are limited as a result of using long-periodic pseudo noise code. A fast acquisition algorithm with double block zero padding (DBZP) truncation correlation for the long code signal is proposed. In the proposed algorithm, the spectral asymmetry of complex sequences is applied to the truncation pretreatment, and the block correlations are executed using DBZP and the circular shifting for less computational complexity and increased acquisition speed. The energy compensation technique is adopted to improve environment adaptability, which makes the algorithm effectively process two-dimensional fast acquisition. The simulated results show that the proposed algorithm has better performance in acquisition speed and environment adaptability compared to the traditional acquisition algorithms in time domain.