CAJ | 학술논문

针对非合作DSSS信号中伪随机码的起始位置进行研究分析,以获取完整周期的扩频调制信息.借鉴图像处理领域中对图像匹配的处理方法,提出一种基于平均相似度的方法,估计DSSS信号中伪码的起始位置.理论分析和Matlab仿真结果表明,提出的算法能够在低信噪比的情况下,以较小的误差估计出伪码的起始位置.以伪码周期和速率的估计作为先决条件,基于平均相似度法进行变步长搜索,估计伪码的起始位置,估计误差在半个伪码码片宽度之内.
침대비합작DSSS신호중위수궤마적기시위치진행연구분석,이획취완정주기적확빈조제신식.차감도상처리영역중대도상필배적처리방법,제출일충기우평균상사도적방법,고계DSSS신호중위마적기시위치.이론분석화Matlab방진결과표명,제출적산법능구재저신조비적정황하,이교소적오차고계출위마적기시위치.이위마주기화속솔적고계작위선결조건,기우평균상사도법진행변보장수색,고계위마적기시위치,고계오차재반개위마마편관도지내.
The starting location of pseudo-random(PN)code in non-cooperative direct sequence spread spectrum(DSSS) signal is researched and analyzed to obtain spread spectrum modulation information in a complete cycle. By using the processing method for image matching in the field of image processing,a method based on average similarity is proposed to estimate PN code starting location in DSSS signal. Theoretical analysis and Matlab simulation results indicate that the proposed algorithm can estimate PN code starting location with smaller error under low SNR condition. Taking the estimation of PN code period and speed rate as prerequisites,DSSS signal is proceeded variable step searching based on average similarity method to estimate PN code starting location. The estimation error is within half width of PN code chip.