干扰条件下快跳频通信中的可靠时差估计方法

A reliable time error estimation method for fast frequency-hopping communications under interference conditions

摘要:

针对快跳频卫星通信中时差估计结果在恶意干扰条件下性能严重恶化的问题,提出一种基于干扰预处理的时差估计方法。提出的方法设计了基于分段FFT的频域干扰检测与抑制方法,能够有效识别并抑制受干扰的跳频信号,同时结合基于分段FFT的频域时差估计方法,实现不同恶意干扰条件下的可靠时差估计。在不同干扰条件下的时差估计性能进行仿真,仿真结果表明在不同干扰带宽、干扰强度下提出的方法均能够得到准确的估计结果,归一化时差的均方误差小于0.01,保证快跳频信号正常解调。

Abstract:

To address the problem that the performance of time error estimatio degrades severely in fast frequency hopping (FFH) satellite communications under malicious interference, a time error estimation method based on interference preprocessing is proposed. The proposed method designs a frequency-domain interference detection and suppression scheme based on segmented FFT, which can effectively detect and suppress interference-affected frequency hopping signals. In addition, a segmented FFT based frequency-domain time error estimation method is employed to achieve reliable time error estimation under different malicious interference conditions. The performance of time error estimation under various interference scenarios is evaluated through simulations. Simulation results demonstrate that the proposed method can achieve accurate estimation under different interference bandwidths and interference power levels, with the mean squared error (MSE) of the normalized time error below 0.01, thereby ensuring the correct demodulation of FFH signals.