GNSS Receiver Testing Focusing on Strong Interference by Use of a Hardware Signal Simulator

Abstract

In aviation environments various interference sources exist, which can degrade the performance of on-board receivers as well as the performance of ground based reference receivers (e.g. in GBAS stations). Therefore, besides functional receiver validation under nominal conditions also the behavior of the receiver under strong interference conditions, namely CW interferers, broadband noise and pulsed interference from Distance Measurement Equipment (DME), must be tested. DME is one of the main interference sources in the E5 Galileo band in aviation environments. Currently, in the project “ANASTASIA”, which is financed by the Sixth Framework Program of the EU, the development of an L1/E5 Galileo receiver for safety-of-life (SoL) applications takes place. Prior to final flight trials this receiver was tested and validated with the help of hardware signal generators. This paper will present an overview of the receiver interference tests. In particular the DME test was performed following the test procedure defined in the Galileo MOPS [4] by EUROCAE WG 62. The test setup will be described in detail and test results will be presented.