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扩谱直序信号是二二阶循环平稳信号,其循环谱幅度包含了信号的码片时宽、载频、幅度等信息,通过分析,文中提出利用非零循环频率处谱峰的位置与大小估计这三个参数的算法,算法不需要伪随机码序列和信号参数等先验信息,可实现对信号参数的盲估计;对参数的估计是在非零循环频率上进行两个一维搜索,很大程度避免或减小了平稳噪声和干扰的影响,适用于低信噪比情况,且避免了多维搜索;文中还分析了算法的实现条件,并通过仿真实验对估计算法性能进行评估.
The spread spectrum direct sequence signal is the second and second order cyclostationary signal whose cyclic spectrum amplitude contains information such as the chip time width, carrier frequency and amplitude of the signal. By analyzing, the paper proposes the use of the position and size of the peak at non-zero cycle frequency The algorithms for estimating these three parameters do not require prior information such as pseudo-random code sequences and signal parameters to achieve blind estimation of the signal parameters. The estimation of the parameters is performed in two one-dimensional searches at non-zero cyclic frequencies, Which largely avoids or reduces the influence of stationary noise and interference. It is suitable for low signal-to-noise ratio and avoids multidimensional search. The paper also analyzes the realization conditions of the algorithm and evaluates the performance of the estimation algorithm through simulation experiments.