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中文摘要：
针对接收端接收到缺乏先验知识的超宽带信号以后，如何确定其伪噪声（PN）码周期的难题，提出了一类基于信号功率谱二次处理的方法。该方法首先对直接序列扩频超宽带信号的功率谱进行估计，然后把估计出的信号功率谱作为输入信号再求功率谱，发现信号的二次功率谱脉冲位置与PN码周期密切相关，将本方法运用于非合作方式通信信号估计场合，只要检测出其相邻脉冲峰值的间隔就能估计出PN码的周期。最后通过计算机模拟程序验证了该方法在较低的输入信噪比条件下与理论分析结果一致，显示了该方法的有效性。
英文摘要：
A kind of method based on the reprocessing of the power spectrum of signals was proposed. It can solve the difficult problem of periodic detection of the PN sequence in the receiving of UWB signals without the prior knowledge. The method estimate the power spectrum density of the direct sequence ultra wideband （DS-LrWB）, then regard this power spectrum as signal and compute power spectrum density again, it＇s discovered that the pulses location of power spectrum reprocessing result of the DS-UWB signal is associated with period of PN sequence. The method can be applied to signal estimate of non-cooperate communication, if the distance of pulse peak of power spectrum reprocessing is scanned and the period of PN sequence can be estimated. The computer simulation validates that this method working in lower SNR is coincident with theoretical analysis, and it shows that the algorithm is effective.
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