二相编码信号性能分析

二相编码信号应用于低截获自导声纳波形设计，具有较好的性能。本文着重研究了二相编码信号的模糊函数及频谱，仿真实验表明二相编码信号距离分辨力及速度分辨力与信号带宽和信号时宽分别对应相关。信号带宽越大则距离分辨力越高，信号时宽越长则速度分辨力越高。同时信号带宽亦与信号频谱幅度成反比关系。信号带宽越大，信号频谱幅度越低，功率谱密度亦越低。因此，选择适当的时宽、带宽，二相编码信号具有较好的低截获性能。

Two-phase coded signal performance analysis

Two-phase encoded signal is applied to low intercept homing sonar waveform design, with better low interception performance. This paper focuses on its ambiguity function and the spectrum, simulation results show that two-phase coded signal range resolution and velocity resolution and signal bandwidth and signal width corresponding correlation. Signal bandwidth greater the distance the higher the resolution, the longer the signal width the higher the speed resolution. While the signal bandwidth is also inversely proportional to the signal amplitude spectrum. Signal bandwidth greater, the lower the amplitude of the signal spectrum, power spectral density is also lower. Therefore, when you select the appropriate width, bandwidth, two-phase coded signal has a better LPI performance.