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中文摘要：
针对存在残余频偏调制下的微弱直扩（DS）信号的伪码（PN码）周期截获的难题,拓展了先前提出的基于信号功率谱二次处理的方法。该方法先对带残余频偏调制的微弱DS信号求取功率谱,然后将所得到的功率谱作为一输入信号求取其第二次功率谱,于是所得二次功率谱将在PN码周期整数倍处出现代表信号存在的尖锐脉冲。通过对这些尖脉冲间的距离进行检测,就可以获得DS信号PN码周期参数的检测估计。理论分析和计算机仿真表明,该方法基本不受输入信号残余频偏的影响,在很大频偏和较低的输入信噪比条件下都能良好地工作。
英文摘要：
Aiming at the difficult problem o（ periodic detection and estimation of the pseudo noise （PN） sequence in the DS-SS signals with residual carrier, a novel detection method is developed. Firstly, the power spectrum of weak DS-SS signals with residual carrier is calculated, and then the second power spectrum is calculated once again by taking the first one as an input signal. Some regular tip-pulses appear at the integer times of period of the PN sequence while obtaining the second power spectrum. Thus, the period of PN sequence can be detected and estimated by measuring the interval of the regular tip-pules. The computer simu lation shows that the proposed method can work well on the lower signal to noise ratio input signals with larger residual carrier.
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