CAJ | 학술논문

针对TD-AltBOC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-AltBOC多信号分量联合捕获方法。该方法通过将本地复制的TD-AltBOC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-AltBOC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％。
침대TD-AltBOC도빈로화수거로마편시분복용，사신호분량마상위상동적특점，제출료보0적TD-AltBOC다신호분량연합포획방법。해방법통과장본지복제적TD-AltBOC신호기수화우수마편위수궤마분별보0소제상린마편수거도변조성적상관봉손실，장4개신호분량적상관치진행다충상간조합，선취최우적상간조합상관치작위최종적통계판결량，해결료전통적단신호분량포획방법손실신호능량적문제。종이론상분석료TD-AltBOC신호마편시분복용대전통FFT포획방법성능적영향，추도료소제출방법적허경개솔화검측개솔표체식。이론화방진결과표명：소제출적방법비전통FFT 방법화GPS L2C CM마단신호분량포획방법제고포획령민도3～6 dB，강저평균포획시간5％～35％，당재조비위38 dB-Hz，허경개솔위0．1％시，검측개솔가체80％。
In TD-AltBOC structure, the data and pilot chips are time-divisional and the four signal components have the same code phase.According to these characteristics, a multi-signal components combining acquisition method based on padding zero was proposed.In this method, the local replicated odd and even chip pseudorandom noise (PN) codes were padded with zero, respectively.This allows for the elimination of the correlation peak loss caused by bit transitions of ad-jacent chips.The correlation values of the four signal components were coherently combined and the optimal correlation value was selected as the final decision variable.This method can solve the signal energy loss problem in the traditional single signal component acquisition.The influence of the time-division multiplexing of TD-Alt BOC signal chips using a traditional FFT acquisition method was analyzed in theory, and the false probability and detection probability expression were deduced.The theoretical and simulated results showed that the proposed method can provide 3~6 dB acquisition sensitivity improvement compared with the conventional FFT and GPS L2C M code single signal component acquisition method.It can also reduce the mean acquisition time by 5%~35%.When carrier to noise ratio and false alarm probabili-ty are 38dB-Hz and 0.1%respectively, the detection probability can reach 80%.