Abstract
A time-domain simulation of along-track interferometric synthetic aperture radar (AT-InSAR) has been developed to support ocean observations. The simulation is in the time domain and based on Bragg scattering to be applicable for moving ocean surfaces. The time-domain simulation is suitable for examining velocities of moving objects. The simulation obtains the time series of microwave backscattering as raw signals for movements of ocean surfaces. In terms of realizing Bragg scattering, the computational grid elements for generating the numerical ocean surface are set to be smaller than the wavelength of the Bragg resonant wave. In this paper, the simulation was conducted for a Bragg resonant wave and irregular waves with currents. As a result, the phases of the received signals from two antennas differ due to the movement of the numerical ocean surfaces. The phase differences shifted by currents were in good agreement with the theoretical values. Therefore, the adaptability of the simulation to observe velocities of ocean surfaces with AT-InSAR was confirmed.
Highlights
Along-track interferometric synthetic aperture radar (AT-InSAR) can monitor the velocities of targets.This type of radar is used for motion observations in situations such as moving target indication [1,2,3,4]or when examining ocean surface currents [5,6].In order to support ocean observations with AT-InSAR, some simulation techniques have been developed [7,8]
We have developed an AT-InSAR time domain simulation for application to observations of moving ocean surfaces
The simulations were conducted for a Bragg resonant wave and irregular waves taking into account the effect of ocean currents
Summary
Along-track interferometric synthetic aperture radar (AT-InSAR) can monitor the velocities of targets.This type of radar is used for motion observations in situations such as moving target indication [1,2,3,4]or when examining ocean surface currents [5,6].In order to support ocean observations with AT-InSAR, some simulation techniques have been developed [7,8]. Along-track interferometric synthetic aperture radar (AT-InSAR) can monitor the velocities of targets. This type of radar is used for motion observations in situations such as moving target indication [1,2,3,4]. In order to support ocean observations with AT-InSAR, some simulation techniques have been developed [7,8]. There have been few studies for time-domain simulations that produce raw signals for AT-InSAR in oceanic scenes taking into account movements of ocean surfaces. We developed a simulation technique for AT-InSAR in the time domain with regard to Bragg scattering [9], which is the primary imaging mechanism for microwave backscattering on the sea surface
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