ID	原文	译文
54187	本文提出了针对低信噪比条件下脉冲重复周期渐变波形的相推测速实现方法。	In this paper, a phase-derived velocity measurement method is proposed for the variable pulse repetition interval waveform under low signal-to-noise ratio(SNR).
54188	首先，建立了考虑脉冲重复周期渐变波形的回波模型;	Firstly, an echo model is established with considering the factor of pulse repetition interval variable.
54189	然后介绍了基于包络测速解相位模糊的相推测速模型;	Then, the PDVM model based on wideband envelope velocity measurement(WEVM) to solve the phase ambiguity is introduced.
54190	进而为了提高相推测速在低信噪比条件下的适用性，分别提出了回波相位提取值修正以及相位模糊数修正方法，	In order to improve the applicability of PDVM method under the condition of low SNR, the extracted echo phase value correction method and the phase ambiguity number correction method are put forward respectively.
54191	其中回波相位提取值修正方法主要结合航迹平滑滤波处理，解决低信噪比条件下峰值点相位提取不准确的问题，	The extracted echo phase value correction method utilizes the track filtering process to smooth the velocity measurement results, which enable to solve the problem of inaccurate extracted peak phase under low SNR.
54192	而相位模糊数修正方法通过遍历模糊数，并最小化模糊数对应的测速起伏误差;	The phase ambiguity number correction method iterates through the phase ambiguity number and then minimizes the corresponding velocity fluctuation measurement error.
54193	最后通过仿真验证了所提方法的正确性及其在低信噪比条件下的适用性。	Finally, the validity of the proposed method and its applicability under low SNR are verified by simulation.
54194	地基雷达对月成像可以获得月球表面的电磁散射特性、地形地貌特征等，可用于月球的科学研究。	Earth-based radar mapping of the moon can obtain the electromagnetic scattering characteristics and topographicfeatures of the lunar surface, which can be used for scientific research on the moon.
54195	地基雷达对月成像技术是将合成孔径技术应用到天文探测当中，	Earth-based radar mapping technologyof the moon is the application of synthetic aperture technology to astronomical detection.
54196	延迟多普勒技术是地基雷达天文成像应用最为广泛的技术，其关键在于运动补偿。	Delay Doppler technology is themost widely used technology for earth-based radar astronomical mapping, and its key lies in motion compensation.