ID 原文 译文
23345 该文所提算法相比于已有算法性能提升明显，参数估计性能优于传统算法且接近参数估计的Cramer-Rao 下界，仿真实验也验证了算法的有效性和优越性。 In this paper, the proposed algorithm has better performance than the existing algorithm, performance of the proposed algorithm is approximate to the Cramer-Rao low bound. The simulation experiments verify the effectiveness and superiority of the proposed algorithm.
23346 该文提出一种基于两维相位编码的距离模糊抑制方法，该方法通过在发射端发射一种两维相位编码的波形，接收端在进行匹配滤波时，距离模糊信号相对于目标信号而言在两维频谱上都会产生偏移。 Based on a two-dimensional phase coding, a novel range ambiguity suppression method is proposed. By transmitting two-dimensional phase coded signals and demodulating the received signals, the two-dimensional spectrum of the range ambiguity is shifted along both range and azimuth directions.
23347 在信号处理阶段，可以针对此频谱差异构造滤波器，实现对距离模糊能量的有效抑制，降低整个测绘带内的距离模糊比，提高合成孔径雷达(SAR)图像质量。 Considering the range frequency and Doppler oversampling, the spectrum of the range ambiguity located outside the data region of spectral support can be filtered out, which suppresses the range ambiguity. It allows for decreasing of the Range Ambiguity to Signal Ratio (RASR) and upgrading of the SAR image quality.
23348 点仿真和面仿真结果都验证了该方法的有效性。 Simulation results for point targets and distributed targets validate the effectiveness of the proposed method.
23349 在加性高斯白噪声环境的单频复指数信号频率估计中，针对现有频率估计算法估计误差分布不均且估计精度较低的问题，该文提出一种细化频谱迭代插值估计算法。 In order to solve the problem of unhomogeneities of estimation error and expensive computing of existing algorithms, an iterative frequency estimation algorithm based on interpolated zoom spectrum is proposed.
23350 该算法首先根据半长信号的快速傅里叶变换峰值位置计算细化频谱，再利用细化频谱幅值进行频率的无偏插值估计，最后利用估计结果和全长信号更新细化频谱并进行迭代插值重估。 Firstly, fast Fourier transform algorithm is applied to get the frequency corresponding to the peak spectral amplitude of the half-length signal. The unbiased estimation of frequency of the signal is then given based on the zoom spectra, which are calculated with the half-length signal. The zoom spectra are updated with the complete signal and the frequency is estimated with the updated zoom spectra, lastly.
23351 仿真结果表明，与现有算法相比，所提算法估计误差分布均匀，且在高信噪比的所有频率范围和低信噪比的大部分频率范围内估计精度更高。 Computing cost analysis proves the superiority of the algorithms when length of signal is long compared with the algorithms in the references.
23352 同时仿真表明，所提算法在加性均匀噪声环境中也有较好的估计性能。 Simulation result verifies good performance of distribution of estimation error and estimation error of the proposed algorithm is closer to the Cramer-Rao lower bound at the circumstance of high signal to noise ratio.
23353 由于具有灵活的频率划分能力，非均匀滤波器组在语音、图像等信号的处理中有着广泛的应用。 Owing to its flexible frequency decomposition ability, nonuniform filter banks are widely applied to speech and image signal processing.
23354 该文针对非均匀 DFT 调制滤波器组无法直接合并构造的缺点，提出一种基于相位调制的构造方法。 However, the nonuniform Discrete Fourier Transform (DFT) modulated filter bank can not be constructed by directly merging certain subbands of the uniform one.