Subjects: Geosciences >> Space Physics submitted time 2017-01-22
Abstract： The detection of water in Mars is currently one of the most striking issues in deep space detection. High Frequency(HF) radar altimeter has good penetrating ability and can measure the range and power simultaneously. In this paper, the principles and design of the altimeter system were presented, the interaction between the altimeter electromagnetic pulses and multi-layer smooth media was deduced, and the model of the echo power with respect to the time delay was extracted. Besides, the effects of Mars surface roughness were also considered. Finally, two typical Mars multi-layer models were adopted, and the dielectric constants and the altimeter echo waveforms were simulated. Results of the simulation show that the vertical dielectric constant profile of Mars subsurface could be retrieved by HF radar altimetry, and the water in Mars could be identified in certain cases.
Peer Review Status:
Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract： The detection of water in Mars is currently one of the most striking issues in deep space detection. High Frequency(HF) radar altimeter has good penetrating ability and can measure the range and power simultaneously. In this paper, the principles and design of the altimeter system were presented, the interaction between the altimeter electromagnetic pulses and multi-layer smooth media was deduced, and the model of the echo power with respect to the time delay was extracted. Besides, the effects of Mars surface roughness were also considered. Finally, two typical Mars multi-layer models were adopted, and the dielectric constants and the altimeter echo waveforms were simulated. Results of the simulation show that the vertical dielectric constant profile of Mars subsurface could be retrieved by HF radar altimetry, and the water in Mars could be identified in certain cases.
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-03
Abstract： The Range Migration Correction (RMC) is a key technique of synthetic aperture radar altimeter which is more precise than the conventional radar altimeter. Because of the satellite motion, the distance change between the satellite and the observed target will bring about some residual errors, but they are ignored in the existing RMC algorithms. In this paper, the influences of the vertical and horizontal velocities of the satellite are studied, then an RMC model is builded, and finally a new RMC algorithm which corrects not only the slant range error but also the residual errors is proposed. The simulation results show that this new algorithm can obtain more accurate outcomes. �2015, Science Press. All right reserved.
Peer Review Status:Awaiting Review
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