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携带应答机的飞行目标,若除了沿其某一轨道运动外,还作自旋运动,应答机天线辐射相位空间分布的不均匀性会使应答机转发信号产生附加的相位调制,因而导致多卜勒测量雷达的测量误差。本文分析了对称安装三天线园柱形应答式目标回波的多卜勒频率调制。得出了附加多卜勒频率及其各阶导数的解析式。研究了目标旋转速度、方向角(目标旋转轴线与雷达视线的夹角)和回波谱线宽度的关系,以及对雷达多卜勒测量精度的影响,它对于研究自旋再入体测量问题具有实用价值。文章给出了一个典型的三天线园锥目标模拟旋转试验结果。试验中在不同目标转速下由相参雷达跟踪测量目标回波,同时记录中频信号、多卜勒跟踪回路鉴频器输出等有用信息。对试验数据的分析得出了明确的结论:目标旋转使回波信号的谱线展宽、测速误差增大,谱线宽度与目标转速成正比,同时谱线宽度随目标方向角增大而加宽,方向角为90°时旋转影响最大。理论分析得出了与试验相同的结果。虽然试验是在静态下进行的,但问题的分析对质心运动的目标也同样适用。
If the flight target carrying an answering machine, apart from moving along one of its orbits, also makes a spin movement, the inhomogeneity of the spatial distribution of the radiation phase of the transponder antenna will cause the transponder to generate additional phase modulations in the transmitted signal, Le surveys the measurement error of the radar. This paper analyzes the Doppler frequency modulation of a symmetrically mounted three-antenna cylindrical target echo. The analytic formula of additional Doppler frequency and its derivatives is obtained. The relationship between the target rotation speed, the azimuth angle (the angle between the target rotation axis and the radar line of sight) and the width of the echo line, and the effect on the Doppler measurement accuracy of the radar are studied. Practical value. The article gives a typical three-antenna cone target simulation rotation test results. In the experiment, the target echo was tracked by coherent radar at different target speeds, and the useful information such as IF signal and Doppler tracking loop discriminator output was recorded. The analysis of the experimental data leads to a clear conclusion: the target rotation broadens the spectral line of the echo signal, increases the error of the velocity measurement, the spectral line width is proportional to the target rotational speed, and the width of the spectral line broadens with the increase of the target directional angle , The direction of rotation of 90 °, the greatest impact. The theoretical analysis shows the same result as the experiment. Although the test is performed statically, the analysis of the problem applies equally to the objective of centroid motions.