ID 原文 译文
18815 实验结果表明，相比于单一尺度图像特征和均值类原型，多级注意力特征网络进一步提高了小样本条件下的分类准确率。 The experimental results show that multi-level attention feature network can further improve the classification accuracy under small sample conditions compared to the single-scale image features and average prototypes.
18816 在方位多通道SAR系统中，由于运动目标的回波特性和静止目标的不同，传统的重构滤波器组方法对运动目标的重建是无效的。 Since the echo characteristics of moving targets are different from that of stationary targets, thetraditional reconstruction filter bank algorithm, i.e., the reconstruction filter algorithm, is not applicable.
18817 该文提出一种方位多通道SAR运动目标信号重构方法。 In thispaper, a novel reconstruction approach of the moving target for a multichannel in azimuth High-ResolutionWide-Swath (HRWS) Synthetic Aperture Radar (SAR) system is proposed.
18818 该方法首先分析了方位多通道SAR系统中运动目标回波特性，并与静止目标回波形式进行对比，给出了传统重构方法失效的主要原因； The approach firstly analyzes the echo characteristics of the moving target for the multi-channel in azimuth SAR system and gives the main reason for the failure of the traditional reconstruction method in contrast to the form of the stationary target echo.
18819 通过引入运动目标的径向速度参数，有效实现了匀速运动目标的频谱重构，较好地抑制了方位多通道SAR系统中匀速运动目标的方位模糊。 By introducing the radial velocity of the moving target, the spectrum reconstruction of the uniformmoving target is effectively realized, and the azimuth ambiguities of the uniform moving target for the multi-channel in azimuth SAR system is well suppressed.
18820 星载仿真实验结果验证了该重构方法的有效性。 Space-borne simulated results confirm the effectiveness of the proposed reconstruction approach.
18821 为改善包络跟踪(ET)发射机带宽、效率、线性度等指标，需优化其关键电路性能并校正系统非线性行为。 To improve bandwidth, efficiency and linearity of Envelope Tracking (ET) architecture, it is necessary to optimize the performance of envelope supply modulator and linearize nonlinear behavior of the ET system.
18822 针对该问题，该文构建电源调制器等效模型，推导其效率极值并阐述效率优化方法；引入频率补偿网络来提升电路带宽及线性性能；基于系统非线性行为特征，提出包络增强型数字预失真模型及线性化方案； The optimization procedure of the supply modulator is proposed based on the equivalent circuit model.The frequency compensation network is used to improve the bandwidth and linearity of the modulator circuit.An envelope enhanced memory polynomial digital pre-distortion model is introduced to address the nonlineardistortion of the ET system.
18823 设计实际电路并搭建包络跟踪系统。 The practical circuit mentioned above is fabricated and the overall experimentalsystem is set up.
18824 对于S频段5/10/20 MHz带宽6.7 dB峰均比测试信号，该系统功放平均效率分别为61%,54%, 44%，且矢量幅度误差(EVM)均优于1%，具有较好的带宽、效率、线性度等性能，验证了电路优化方法及非线性行为校正方案的可行性。 Measurement results show that the ET PA at S-band obtains measured efficiency 61%, 54%,44% and Error Vector Magnitude (EVM) 1% for 6.7 dB PAPR signals with 5 MHz/10 MHz/20 MHzmodulation bandwidths, respectively. The ET system exhibits competitive bandwidth, efficiency and linearity,which verifies the proposed optimization and linearization methodology.