Mars Advanced Radar For Subsurface And Ionosphere Sounding (MARSIS)
Mars Advanced Radar For Subsurface And Ionosphere Sounding (MARSIS)
复制标题
火星地下和电离层探测先进雷达 (MARSIS)
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
E. Zampolini
中科院分区：
文献类型：
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作者：
G. Picardi;D. Biccari;A. Cicchetti;R. Seu;J. Plaut;William T. K. Johnson;R. Jordan;D. Gurnett;R. Orosei;E. Zampolini
根据火星快车使命，火星信息系统的主要科学目标是绘制火星地壳上部液态和固态水的分布图。探测这些水库将解决火星水文、地质、气候和可能的生物进化中的关键问题，包括当前和过去的全球水资源清单、水的运输和储存机制。MARSIS实验的三个次要目标是：地下地质探测、表面表征和电离层探测。探测雷达的探测性能受到表面杂波回波的限制：因此，为了最大限度地提高粗糙表面的探测深度，在MARSIS中将实现三种不同的方法：多普勒波束锐化，次级单极天线和双频处理。此外，精细距离分辨率和高压缩比的要求要求高传输带宽（1 MHz），使MARSIS将工作在一个非常高的分数带宽和非常接近预期的火星电离层峰值等离子体频率。这将导致在接收脉冲的频谱上的通常大的相位失真，这将导致匹配滤波器在SNR、脉冲扩展和旁瓣控制方面的性能的严重退化。本技术文件特别涉及讨论在信号带宽上存在相位失真的情况下用于雷达探测器回波的匹配滤波的两种自适应距离压缩算法。此外，
According to the Mars Express mission, the MARSIS primary scientific objective is to map the distribution of water, both liquid and solid, in the upper portions of the crust of Mars. Detection of such reservoirs of water will address key issue s in the hydrologic, geologic, climatic and possible biologic evolution of Mars, including the current and past global inventory of water, mechanisms of transport and storage of water. Three secondary objectives are defined for the MARSIS experiment: subsurface geologic probing, surface characterization, and ionosphere sounding. The detection performance in the sounding radar are limited by the surface clutter echoes: therefore in order to maximize the sounding depth against rough surfaces, three different methods will be implemented in MARSIS: Doppler Beam Sharpening, Secondary Monopole Antenna, and Dual Frequency Processing. Moreover the requirements for fine range resolution and high compression ratios call for a high transmitted bandwidth (1 MHz) so that MARSIS will operate with a very high fractional bandwidth and very close to the expected Martian Ionosphere peak plasma frequency. This will result in a generally large phase distortion across the spectrum of the received pulses which will cause severe d egradation of the matched filter performance in term of SNR, pulse spreading and sidelobe control. The present technical paper in particular deals with the discussion of two adaptive range compression algorithm for the matched filtering of Radar sounder echoes in presence of phase distortion across the signal bandwidth. Also the unique capability of