CAJ | 학술논문

针对BOC(n, n)型信号自相关函数存在三个峰值导致伪码捕获模糊性的问题, 提出了一种新的基于相关函数的精确无模糊的捕获算法。该算法将信号进行频域的多普勒补偿, 通过本地增设QBOC(n, n)支路, 利用BOC(n, n)信号自相关以及BOC(n, n)和QBOC(n, n)互相关, 经移位±TC/4、取模、求和、平方运算而实现。理论与仿真分析表明, 该算法在不改变自相关主峰宽度的情况下完全消除相关副峰的同时, 显著提高了主峰峰值; 比传统捕获算法的性能好4. 5 dB左右, 并且捕获精度良好、易于实现。
침대BOC(n, n)형신호자상관함수존재삼개봉치도치위마포획모호성적문제, 제출료일충신적기우상관함수적정학무모호적포획산법。해산법장신호진행빈역적다보륵보상, 통과본지증설QBOC(n, n)지로, 이용BOC(n, n)신호자상관이급BOC(n, n)화QBOC(n, n)호상관, 경이위±TC/4、취모、구화、평방운산이실현。이론여방진분석표명, 해산법재불개변자상관주봉관도적정황하완전소제상관부봉적동시, 현저제고료주봉봉치; 비전통포획산법적성능호4. 5 dB좌우, 병차포획정도량호、역우실현。
For the problem of ambiguous acquisition of BOC signal caused by its auto-correlation had three peaks for BOC(n, n), this paper presented a new accurate method which was based on correlation function. Firstly, it made the receiving signal Doppler compensation in frequency domain, and implemented the new algorithm by adding a local quadratic BOC(n, n) signal and using the result of BOC(n, n) signal auto-correlation and BOC(n, n) and QBOC(n, n) cross-correlation, after shifting±TC/4, modulus, summation, square. Theory and simulation results show that, the method does not only change the autocorrelation peak width, completely eliminate the related side peaks at the same time, and significantly improve the peak, increases the probability of detection about 4. 5 dB than traditional acquisition algorithm, but also the precision of capture are very good and easy to implement.