Dual-Frequency Along Track Interferometry

As an important application of the synthetic aperture principle, the along track Interferometry SAR technology can use the full-resolution two-dimensional coherent data with time difference to obtain the doppler parameters of the scene image, and further extract the corresponding radial velocity, which has been widely used in a variety of scenarios, including ocean current velocity measurement and ground moving target detection. However, there is a fixed ambiguity velocity in the single-band or single-baseline Interferometry system, and the overall accuracy is not high after phase unwrapping. In this paper, a dual-frequency along track Interferometry technique for high-precision moving target indication is proposed, and the feasibility demonstration is carried out based on the concept of dual-frequency system modes. Advantages of the system are clarified through numerical analysis.