Ground-based Augmentation System(GBAS) is a next generation safety-critical satellite-based aircraft precision approach and landing system. A case of RF interference to GBAS reference receivers by PPD in Newark Airport was reported. This paper survey the 10 available commercial PPD properties of the transmitted RF signal, and effects on the GBAS reference GPS receiver based on the test data. The test results present measurements of the average of receiver C/N₀, and the standard deviation of code minus carrier. From the attenuator levels, the geographical separation for the PPD and the GBAS reference receivers was calculated. It is possible to contribute the development of GBAS siting criteria.

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