补0的TD-AltBOC多信号分量联合捕获方法

发布时间：2018-05-31 14:14

本文选题：卫星导航 + COMPASS　；参考：《哈尔滨工程大学学报》2014年11期

【摘要】：针对TD-Alt BOC导频路和数据路码片时分复用,四信号分量码相位相同的特点,提出了补0的TD-Alt BOC多信号分量联合捕获方法。该方法通过将本地复制的TD-Alt BOC信号奇数和偶数码片伪随机码分别补0消除相邻码片数据跳变造成的相关峰损失,将4个信号分量的相关值进行多种相干组合,选取最优的相干组合相关值作为最终的统计判决量,解决了传统的单信号分量捕获方法损失信号能量的问题。从理论上分析了TD-Alt BOC信号码片时分复用对传统FFT捕获方法性能的影响,推导了所提出方法的虚警概率和检测概率表达式。理论和仿真结果表明:所提出的方法比传统FFT方法和GPS L2C CM码单信号分量捕获方法提高捕获灵敏度3~6 dB,降低平均捕获时间5%~35%,当载噪比为38 dB-Hz,虚警概率为0.1%时,检测概率可达80%。
[Abstract]:Aiming at the characteristics of TD-Alt BOC pilot and data path code division multiplexing and the same phase of four-component code, a TD-Alt BOC multi-signal component joint acquisition method based on complement 0 is proposed. In this method, the correlation peak loss caused by the data jump of adjacent chip is eliminated by compensating the odd number and the pseudorandom code of even number TD-Alt BOC signal, respectively, and the correlation values of the four signal components are combined in a variety of coherent ways. The optimal coherent combination correlation value is chosen as the final statistical decision quantity to solve the problem that the traditional single signal component acquisition method loses the signal energy. The influence of TD-Alt BOC signal slice time division multiplexing on the performance of traditional FFT acquisition method is analyzed theoretically. The expressions of false alarm probability and detection probability of the proposed method are derived. The theoretical and simulation results show that the proposed method improves the acquisition sensitivity by 3 ~ 6 dB compared with the traditional FFT method and the single signal acquisition method of GPS L2C CM code, and reduces the average acquisition time by 5 / 35. When the carrier / noise ratio is 38 dB / Hz and the false alarm probability is 0.1, the detection probability can reach 80% and 80 dB respectively.
【作者单位】：北京航空航天大学电子信息工程学院;
【基金】：国家自然科学基金资助项目(61101076,41374137)
【分类号】：TN96.1

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