CAJ | 학술논문

文章采用二次功率谱法实现直接序列扩频信号(DS/SS信号)伪码周期的估计，此方法是对接收信号求得一次功率谱后再进行第二次求功率谱处理，最终得到信号的二次谱在信号伪码周期整数倍处出现一系列的尖峰脉冲，脉冲间距即为伪码周期。通过对二次谱法进行仿真实验，结果表明在较低信噪比条件下能够实现直扩信号的伪码周期估计；准确估计时所需的信噪比容限随着伪码周期的增加而逐渐降低。
문장채용이차공솔보법실현직접서렬확빈신호(DS/SS신호)위마주기적고계，차방법시대접수신호구득일차공솔보후재진행제이차구공솔보처리，최종득도신호적이차보재신호위마주기정수배처출현일계렬적첨봉맥충，맥충간거즉위위마주기。통과대이차보법진행방진실험，결과표명재교저신조비조건하능구실현직확신호적위마주기고계；준학고계시소수적신조비용한수착위마주기적증가이축점강저。
The paper uses spectrum reprocessing method to achieve the periodic estimation of PN sequence code in direct sequence spread spectrum (DS/SS) signal. The method carries out the second calculation of power spread after computing the power spectrum of the received signals at the first step. Finally the power spectrum reprocessing results will appear spectral line with integral equal to the period of PN sequence and pulse spacing is the PN sequence. The computer simulation results show that the proposed method can well realize the periodic estimation of PN Sequence in DS-SSsignal under the lower SNR input signals. The SNR tolerance for accurate estimation is getting lower as the increase of pseudorandom code period.