Along-track interferometric synthetic aperture radar

DETAILED DESCRIPTION It is therefore an object of the present invention to provide an along-track interferometric SAR allowing a single SAR channel and one time of observation to suffice without resorting to any additional hardware.
An along-track interferometric SAR of the present invention includes a single SAR channel for acquiring SAR data by observing a target only once.
A reconstructing section reconstructs two SAR images deviated in time from the SAR data to thereby output two reconstructed SAR images.
A detecting section calculates a phase difference between the two reconstructed SAR images to thereby detect the velocity of the target in the SAR eye direction.
The reconstructing section bisectes, based on the fact that the frequency of a wave returned from the ground undergoes a Doppler shift due to the movement of an SAR relative to the ground, the SAR data in the frequency domain and processes the bisected SAR data.