| 双频雷达高度计电离层色散效应误差分析 |
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| 作者姓名： | 徐曦煜 刘和光 |
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| 作者单位： | 1.中国科学院空间科学与应用研究中心，北京 100080；
2 中国科学院研究生院，北京 100049 |
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| 摘 要： | 由于现代星载雷达高度计采用了脉冲压缩技术，引入了电离层色散误差，在双频高度计的低频段该误差更明显。本文基于全去斜技术的理论模型，推导了这项误差的机理，提出可以把该误差等效为二次相位误差，并结合具体参数给出了分析的结果。本文还讨论了Chirp信号的多普勒误差对测高的影响。最后，作者通过计算机仿真得到了电离层色散效应对系统点目标响应的影响,对前面的结论进行了验证。
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| 关 键 词： | 双频高度计 电离层色散效应 二次相位误差 点目标响应 |
Error analysis of ionospheric dispersion on dual-frequency altimetry |
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| Authors: | XU Xi-Yu LIU He-Guang |
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| Institution: | 1.Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100080, China;2.Graduate University , Chinese Academy of Sciences, Beijing 100049, China ; |
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| Abstract: | Radar altimeters selects full-deramp technology in pulse compression, and apply two frequencies to reduce the ionospheric range errors. These will, as this paper shows, introduce an effect called “Ionospheric Dispersion”, especially in lower frequency, and this can lead to errors in height estimation. No foreign document is accessible to solve this problem, so this paper attempts to illustrate it. The authors at last draw the conclusion that these errors can be treated similarly as the quadratic phase errors, whose nature and solution are well-established, and they also discussed the magnitude of this error for a typical altimeter. Furthermore, the actual Doppler errors are deduced are it is shown that the existent Doppler algorithms are adequately accurate. Finally, by computer simulation, the sidelobes introduced to the system point target response are illustrated and the errors are estimated. |
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| Keywords: | Dual-frequency Altimeter Ionospheric Dispersion Quadratic Phase Errors Point Target Response |
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