中文摘要：

为解决测距仪脉冲干扰L频段数字航空通信系统1（L-DACS1）正交频分复用（OFDM）接收机的问题,提出一种基于非线性最小二乘（NLS）准则的测距仪脉冲干扰抑制方法。该方法根据测距仪脉冲干扰的高功率特性,将测距仪脉冲信号作为目标信号,利用非线性最小二乘（NLS）准则估计测距仪脉冲信号的幅值与频率参数;然后重构测距仪脉冲信号,并将其从OFDM接收机接收信号中去除,达到干扰抑制的目的。仿真结果表明：所提出的基于NLS的干扰抑制方法可有效重构测距仪脉冲信号,消除其对L-DACS1系统的干扰,显著提高L-DACS1系统链路传输的可靠性。

英文摘要：

To mitigate the deleterious influence of distance measure equipment （DME） interference signals on orthogonal frequency division multiplexing （OFDM） receiver of L-band digital aeronautical communications system 1 （L- DACS1 ）, a new DME interference suppression method is proposed based on nonlinear least squares （NLS）. The DME pulse is taken as the signal of interest because of its higher power characteristic; meanwhile, the frequency and complex amplitude of DME signal are estimated under the criterion of NLS. Then DME signal is reconstruct- ed, and suppressed by subtracting the estimated DME signal from the received signal of OFDM receiver. Computer simulation indicates that the proposed method can reconstruct DME signal and reduce the impact of interference effectively, and improve the reliability of OFDM receiver of L-DACS1 system significantly.