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Different techniques have been developed and evaluated to address both the RCS minimization and EMC/EMI issues related to propeller modulations of small UAVs, which are part of the issues of survivability of small UAS in counter-UAS environments: (1) surface impedance characterization, (2) radar cross section measurements, and (3) nearfield probing. Initial results from some of these evaluations and analyses, especially the new techniques developed, are presented.

The concept of a unified, portable, and precise navigation solution for future precise manned and unmanned air vehicle landing support would need both enhanced GNSS technology and non-GNSS (such as precise approach radar) together in one package. This concept and initial implementations are discussed. Initial evaluations using different Software-Defined-Radio (SDRs) to implement the GNSS augmentation functions are performed and compared to certified ground augmentation system receivers. The results show the promising feasibility of integrating GNSS augmentation and precise approach radar function to support future landing missions.