Multi-frequency precision radar altimetry from space for estimation of sea surface state

作者：Ka Min Ho^*; Baskakov Aleksandr I; Jeon Se Yeon; Paek Inchan; Jang Jonghun

来源：Electronics Letters, 2016, 52(21): 1804-1805.

DOI：10.1049/el.2016.2356

• correlation methods
• radar altimetry
• radar signal processing
• sensitivity
• turbulence
• oceanographic techniques
• angle modulation
• geophysical signal processing
• airborne radar
• multifrequency precision radar altimetry
• sea surface state estimation
• measurement performance
• dual-frequency correlation radar altimetry
• sea wave height estimation
• multifrequency sensing signals
• sea wave turbulences
• angle modulation
• optimum modulation index
• measurement sensitivity

The measurement performance of the dual-frequency correlation radar altimetry for the estimation of the sea wave heights is not as accurate in satellite as in airborne platform. Multi-frequency sensing signals can be applied to obtain sea surface state information while maintaining sensitivity over wide range of sea wave turbulences from space. The proposed method uses a sensing signal with angle modulation with optimum modulation index of m = 4.5, which enables to obtain a spectrum from 11 harmonics, instead of generating 11 frequency transmit signals for spaceborne multi-frequency radar altimetry. Maximum sensitivity of the measurement to the root-mean-square of the sea wave heights was obtained for the optimal frequency gaps between transmit signals.

• 出版日期2016-10-13