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提出一种估值滤波器（ＥＦ）输入和权值修正中均采用判决值的非线性判决反馈干扰抑制器（ＮＤＦＩＳ）．推导了ＮＤＦＩＳ抑制单频干扰时的最佳信噪比改善的表示式。分析比较了ＮＤＦＩＳ和线性干扰抑制器（ＬＩＳ）的最佳信噪比改善与单频干扰的频偏和ＥＦ的权值个数之间的关系及ＮＤＦＩＳ和现有的非线性干扰抑制器（ＮＩＳ）的最佳信噪比改善，理论分析和计算机模拟结果完全一致，ＮＤＦＩＳ优于ＬＩＳ和ＮＩＳ．
A nonlinear decision feedback interference suppressor (NDFIS) is proposed which uses decision values both in the input of the estimation filter (EF) and in the weight correction. The expression of the best signal to noise ratio (SNR) improvement when NDFIS suppresses single frequency interference is deduced. The relationship between the best SNR of NDFIS and linear interference suppressor (LIS), the frequency offset of single frequency interference and the number of weights of EF is analyzed and compared. The relationship between NDFIS and the existing nonlinear interference suppressor (NIS ) Improved the best signal to noise ratio, the theoretical analysis and computer simulation results are completely consistent, NDFIS better than LIS and NIS.