Preliminary Results of Near Field RFI Localization Based on Virtual Large Aperture with Compressed Sensing

Radio frequency interference (RFI) has great negative impact on the precision of the geophysical parameters retrieved from the microwave synthetic aperture interferometric measurements, so accurate localization of RFI sources is an important issue. In this paper, a method called near field localization based on virtual large aperture with compressed sensing is proposed to improve the localization accuracy and deal with the localization of weak RFI sources. By utilizing the movement of the platform and combing the measurements at different positions, a large virtual aperture can be formed, and the RFI sources are in the near field of the large virtual aperture, which is similar to the supersynthesis radiometer. The equation is established according to the concept, and based on the sparsity characteristic of RFI sources, compressed sensing technique is adopted to reconstruct the location of the RFI sources. In order to demonstrate the feasibility of the proposed method, numerical simulation and indoor prototype experiments are conducted, and preliminary results show the method can handle the problem.