User RAIM integrity and interference mitigation test results with upgraded German Galileo test range GATE

GATE is the only Galileo test and development range worldwide where already today navigation is possible with realistic Galileo signals on three frequencies simultaneously in an outdoor environment. The testbed has started commercial operations in August 2008. In parallel a system upgrade has been performed in terms of upgrading GATE to the latest Galileo signal structure (ESA Galileo SIS ICD and Galileo Open Service SIS ICD) including CBOC. Hence GATE is now capable of transmitting the Galileo OS, the Galileo SoL Service (functional), the Galileo CS and a Galileo PRS dummy signal according to the latest Galileo SIS ICD version. This GATE system upgrade is being further extended now to support user integrity testing more effectively. For this reason two additional transmit stations are deployed, resulting in a number of eight stations in total. In addition, GATE will be capable to emulate simple feared events on system/satellite level after the upgrade, so that the GATE system will support GPS and GATE/Galileo dual constellation RAIM, individual user integrity test scenarios as well as test of receivers with different RAIM functionalities implemented. The paper will give an overview on the status of the work to be performed in the framework of the system upgrade of the GATE test infrastructure. It further will present first results of user RAIM integrity and interference mitigation tests obtained by test campaigns in the upgraded GATE testbed.