scholarly journals Bistatic High-Frequency Radar Cross-Section of the Ocean Surface with Arbitrary Wave Heights

2020 ◽  
Vol 12 (4) ◽  
pp. 667
Author(s):  
Murilo Teixeira Silva ◽  
Weimin Huang ◽  
Eric W. Gill
Keyword(s):  
Electric Field ◽  
Cross Section ◽  
High Frequency ◽  
Scattering Theory ◽  
Additional Term ◽  
Ocean Surface ◽  
Radar Cross Section ◽  
Wave Direction ◽  
Dominant Wave ◽  
Wave Heights

The scattering theory developed in the past decades for high-frequency radio oceanography has been restricted to surfaces with small heights and small slopes. In the present work, the scattering theory for bistatic high-frequency radars is extended to ocean surfaces with arbitrary wave heights. Based on recent theoretical developments in the scattering theory for ocean surfaces with arbitrary heights for monostatic radars, the electric field equations for bistatic high-frequency radars in high sea states are developed. This results in an additional term related to the first-order electric field, which is only present when the small-height approximation is removed. Then, the radar cross-section for the additional term is derived and simulated, and its impact on the total radar cross-section at different radar configurations, dominant wave directions, and sea states is assessed. The proposed term is shown to impact the total radar cross-section at high sea states, dependent on radar configuration and dominant wave direction. The present work can contribute to the remote sensing of targets on the ocean surface, as well as the determination of the dominant wave direction of the ocean surface at high sea states.

scholarly journals Bistatic High Frequency Radar Ocean Surface Cross Section for an FMCW Source with an Antenna on a Floating Platform

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Yue Ma ◽  
Weimin Huang ◽  
Eric W. Gill
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
High Frequency ◽  
Continuous Wave ◽  
Ocean Surface ◽  
Radar Cross Section ◽  
Second Order ◽  
Floating Platform ◽  
High Frequency Radar ◽  
Radar Cross Sections

The first- and second-order bistatic high frequency radar cross sections of the ocean surface with an antenna on a floating platform are derived for a frequency-modulated continuous wave (FMCW) source. Based on previous work, the derivation begins with the general bistatic electric field in the frequency domain for the case of a floating antenna. Demodulation and range transformation are used to obtain the range information, distinguishing the process from that used for a pulsed radar. After Fourier-transforming the autocorrelation and comparing the result with the radar range equation, the radar cross sections are derived. The new first- and second-order antenna-motion-incorporated bistatic radar cross section models for an FMCW source are simulated and compared with those for a pulsed source. Results show that, for the same radar operating parameters, the first-order radar cross section for the FMCW waveform is a little lower than that for a pulsed source. The second-order radar cross section for the FMCW waveform reduces to that for the pulsed waveform when the scattering patch limit approaches infinity. The effect of platform motion on the radar cross sections for an FMCW waveform is investigated for a variety of sea states and operating frequencies and, in general, is found to be similar to that for a pulsed waveform.

scholarly journals High-Frequency Radar Cross Section of Ocean Surface for an FMICW Source

2021 ◽  
Vol 9 (4) ◽  
pp. 427
Author(s):  
Hangyu Zhao ◽  
Yeping Lai ◽  
Yuhao Wang ◽  
Hao Zhou
Keyword(s):  
Electric Field ◽  
Cross Section ◽  
High Frequency ◽  
Surface States ◽  
Radar Cross Section ◽  
Second Order ◽  
Sea Surface ◽  
Field Equations ◽  
Wave Radar ◽  
Section Model

The frequency-modulated interrupted continuous waveform (FMICW) has been widely used in remotely sensing sea surface states by high-frequency ground wave radar (HFGWR). However, the radar cross section model of the sea surface for this waveform has not yet been presented. Therefore, the first- and second-order cross section models of the sea surface about this waveform are derived in this study. The derivation begins with the general electric field equations. Subsequently, the FMICW source is introduced as the radar transmitted signal to obtain the FMICW-incorporated backscattered electric field equations. These equations are used to calculate range spectra by Fourier transforming. Therefore, Fourier transformation of the range spectra calculated from successive sweep intervals gives the Doppler spectra or the power spectral densities. The radar cross section model is obtained by directly comparing the Doppler spectra with the standard radar range equation. Moreover, the derived first- and second-order radar cross section models for an FMICW source are simulated and compared with those for a frequency-modulated continuous waveform (FMCW) source. Results show that the cross section models for the FMICW and FMCW cases have different analytical expressions but almost the same numerical results.

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