为解决通信侦察中非协作接收机接收的信号受共信道信号干扰的问题,提出了一种基于循环谱包络的多信号载频、码片时宽估计算法.该算法不需要伪随机码等先验信息,可实现对时频重叠的多循环平稳信号参数的盲估计.由于该参数估计算法是在非零循环频率上进行搜索,故可以有效地减少平稳噪声和干扰的影响,适用于低信噪比的情况.仿真实验表明,当双信号功率比为1:1且信噪比为-9dB时,该算法对载频估计的正确率可达100%;当信噪比为-4dB时,对码片时宽估计的正确率可达99%.%To solve the problem that the signal received by a non-cooperative receiver in communication reconnaissance is interfered by co-channel signals, a new algorithm based on cyclic spectrum amplitude was proposed to estimate the carrier frequencies and chip width of multi-signals. This algorithm is suitable for signals with low SNR (signal-to-noise ratio) and can implement blind estimation without prior knowledge of pseudorandom sequences, and it avoids the impact and interference of stationary noises by searching in nonzero cyclic frequencies. The simulations indicate that when the power ratio is 1 to 1, the correct probability of carrier frequencies can reach 100％ for SNR = -9 dB, and the correct probability of chip width can reach 99％ for SNR = -4 dB.
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